Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

65 files changed, 9112 insertions, 0 deletions

diff --git a/third_party/libwebrtc/examples/androidapp/AndroidManifest.xml b/third_party/libwebrtc/examples/androidapp/AndroidManifest.xml
new file mode 100644
index 0000000000..05f1bd3da3
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/AndroidManifest.xml
@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          xmlns:tools="http://schemas.android.com/tools"
+          package="org.appspot.apprtc"
+          android:versionCode="1"
+          android:versionName="1.0">
+
+    <uses-feature android:name="android.hardware.camera" />
+    <uses-feature android:name="android.hardware.camera.autofocus" />
+    <uses-feature android:glEsVersion="0x00020000" android:required="true" />
+
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <!-- This is a test application that should always be debuggable. -->
+    <application android:label="@string/app_name"
+                 android:icon="@drawable/ic_launcher"
+                 android:allowBackup="false"
+                 android:debuggable="true"
+                 android:supportsRtl="false"
+                 tools:ignore="HardcodedDebugMode">
+
+        <activity android:name="ConnectActivity"
+                  android:label="@string/app_name"
+                  android:windowSoftInputMode="adjustPan"
+                  android:theme="@style/AppTheme"
+                  android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <category android:name="android.intent.category.BROWSABLE"/>
+                <data android:scheme="https" android:host="appr.tc"/>
+                <data android:scheme="http" android:host="appr.tc"/>
+            </intent-filter>
+        </activity>
+
+        <activity android:name="SettingsActivity"
+                  android:label="@string/settings_name"
+                  android:theme="@style/AppTheme">
+        </activity>
+
+        <activity android:name="CallActivity"
+                  android:label="@string/app_name"
+                  android:screenOrientation="fullUser"
+                  android:configChanges="orientation|smallestScreenSize|screenSize|screenLayout"
+                  android:theme="@style/CallActivityTheme">
+        </activity>
+    </application>
+</manifest>
diff --git a/third_party/libwebrtc/examples/androidapp/OWNERS b/third_party/libwebrtc/examples/androidapp/OWNERS
new file mode 100644
index 0000000000..109bea2725
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/OWNERS
@@ -0,0 +1,2 @@
+magjed@webrtc.org
+xalep@webrtc.org
diff --git a/third_party/libwebrtc/examples/androidapp/README b/third_party/libwebrtc/examples/androidapp/README
new file mode 100644
index 0000000000..97e609117c
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/README
@@ -0,0 +1,23 @@
+This directory contains an example Android client for https://appr.tc
+
+Prerequisites:
+- "Getting the code", "Compiling", and "Using the Bundled Android SDK/NDK"
+  on http://www.webrtc.org/native-code/android
+
+Example of building & using the app:
+
+cd <path/to/webrtc>/src
+ninja -C out/Default AppRTCMobile
+adb install -r out/Default/apks/AppRTCMobile.apk
+
+In desktop chrome, navigate to https://appr.tc and note the r=<NNN> room
+this redirects to or navigate directly to https://appr.tc/r/<NNN> with
+your own room number. Launch AppRTC on the device and add same <NNN> into the room name list.
+
+You can also run application from a command line to connect to the first room in a list:
+adb shell am start -n org.appspot.apprtc/.ConnectActivity -a android.intent.action.VIEW
+This should result in the app launching on Android and connecting to the 3-dot-apprtc
+page displayed in the desktop browser.
+To run loopback test execute following command:
+adb shell am start -n org.appspot.apprtc/.ConnectActivity -a android.intent.action.VIEW --ez "org.appspot.apprtc.LOOPBACK" true
+
diff --git a/third_party/libwebrtc/examples/androidapp/ant.properties b/third_party/libwebrtc/examples/androidapp/ant.properties
new file mode 100644
index 0000000000..b0971e891e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/ant.properties
@@ -0,0 +1,17 @@
+# This file is used to override default values used by the Ant build system.
+#
+# This file must be checked into Version Control Systems, as it is
+# integral to the build system of your project.
+
+# This file is only used by the Ant script.
+
+# You can use this to override default values such as
+#  'source.dir' for the location of your java source folder and
+#  'out.dir' for the location of your output folder.
+
+# You can also use it define how the release builds are signed by declaring
+# the following properties:
+#  'key.store' for the location of your keystore and
+#  'key.alias' for the name of the key to use.
+# The password will be asked during the build when you use the 'release' target.
+
diff --git a/third_party/libwebrtc/examples/androidapp/build.xml b/third_party/libwebrtc/examples/androidapp/build.xml
new file mode 100644
index 0000000000..aa1db6db79
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/build.xml
@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="AppRTCMobile" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+         It contains the path to the SDK. It should *NOT* be checked into
+         Version Control Systems. -->
+    <property file="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+         'android' tool to add properties to it.
+         This is the place to change some Ant specific build properties.
+         Here are some properties you may want to change/update:
+
+         source.dir
+             The name of the source directory. Default is 'src'.
+         out.dir
+             The name of the output directory. Default is 'bin'.
+
+         For other overridable properties, look at the beginning of the rules
+         files in the SDK, at tools/ant/build.xml
+
+         Properties related to the SDK location or the project target should
+         be updated using the 'android' tool with the 'update' action.
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems.
+
+         -->
+    <property file="ant.properties" />
+
+    <!-- if sdk.dir was not set from one of the property file, then
+         get it from the ANDROID_HOME env var.
+         This must be done before we load project.properties since
+         the proguard config can use sdk.dir -->
+    <property environment="env" />
+    <condition property="sdk.dir" value="${env.ANDROID_SDK_ROOT}">
+        <isset property="env.ANDROID_SDK_ROOT" />
+    </condition>
+
+    <!-- The project.properties file is created and updated by the 'android'
+         tool, as well as ADT.
+
+         This contains project specific properties such as project target, and library
+         dependencies. Lower level build properties are stored in ant.properties
+         (or in .classpath for Eclipse projects).
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable."
+            unless="sdk.dir"
+    />
+
+    <!--
+        Import per project custom build rules if present at the root of the project.
+        This is the place to put custom intermediary targets such as:
+            -pre-build
+            -pre-compile
+            -post-compile (This is typically used for code obfuscation.
+                           Compiled code location: ${out.classes.absolute.dir}
+                           If this is not done in place, override ${out.dex.input.absolute.dir})
+            -post-package
+            -post-build
+            -pre-clean
+    -->
+    <import file="custom_rules.xml" optional="true" />
+
+    <!-- Import the actual build file.
+
+         To customize existing targets, there are two options:
+         - Customize only one target:
+             - copy/paste the target into this file, *before* the
+               <import> task.
+             - customize it to your needs.
+         - Customize the whole content of build.xml
+             - copy/paste the content of the rules files (minus the top node)
+               into this file, replacing the <import> task.
+             - customize to your needs.
+
+         ***********************
+         ****** IMPORTANT ******
+         ***********************
+         In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+         in order to avoid having your file be overridden by tools such as "android update project"
+    -->
+    <!-- version-tag: 1 -->
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+
+</project>
diff --git a/third_party/libwebrtc/examples/androidapp/project.properties b/third_party/libwebrtc/examples/androidapp/project.properties
new file mode 100644
index 0000000000..a6ca533fe3
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/project.properties
@@ -0,0 +1,16 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-22
+
+java.compilerargs=-Xlint:all -Werror
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/disconnect.png b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/disconnect.png
new file mode 100644
index 0000000000..be36174c24
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/disconnect.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_action_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_action_full_screen.png
new file mode 100644
index 0000000000..22f30d31ca
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_action_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_action_return_from_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_action_return_from_full_screen.png
new file mode 100644
index 0000000000..d9436e5248
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_action_return_from_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_launcher.png b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_launcher.png
new file mode 100644
index 0000000000..f01a31a717
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_launcher.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_loopback_call.png b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_loopback_call.png
new file mode 100644
index 0000000000..39311853b3
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-hdpi/ic_loopback_call.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/disconnect.png b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/disconnect.png
new file mode 100644
index 0000000000..be36174c24
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/disconnect.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_action_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_action_full_screen.png
new file mode 100644
index 0000000000..e4a9ff0a8e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_action_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_action_return_from_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_action_return_from_full_screen.png
new file mode 100644
index 0000000000..f5c80f00e7
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_action_return_from_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_launcher.png b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_launcher.png
new file mode 100644
index 0000000000..5492ed770a
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_launcher.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_loopback_call.png b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_loopback_call.png
new file mode 100644
index 0000000000..39311853b3
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-ldpi/ic_loopback_call.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/disconnect.png b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/disconnect.png
new file mode 100644
index 0000000000..be36174c24
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/disconnect.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_action_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_action_full_screen.png
new file mode 100644
index 0000000000..e4a9ff0a8e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_action_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_action_return_from_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_action_return_from_full_screen.png
new file mode 100644
index 0000000000..f5c80f00e7
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_action_return_from_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_launcher.png b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_launcher.png
new file mode 100644
index 0000000000..b8b4b0ec4b
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_launcher.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_loopback_call.png b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_loopback_call.png
new file mode 100644
index 0000000000..39311853b3
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-mdpi/ic_loopback_call.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/disconnect.png b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/disconnect.png
new file mode 100644
index 0000000000..be36174c24
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/disconnect.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_action_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_action_full_screen.png
new file mode 100644
index 0000000000..6d90c071d5
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_action_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_action_return_from_full_screen.png b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_action_return_from_full_screen.png
new file mode 100644
index 0000000000..a773b34208
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_action_return_from_full_screen.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_launcher.png b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_launcher.png
new file mode 100644
index 0000000000..a3cd45890c
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_launcher.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_loopback_call.png b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_loopback_call.png
new file mode 100644
index 0000000000..39311853b3
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/drawable-xhdpi/ic_loopback_call.png
diff --git a/third_party/libwebrtc/examples/androidapp/res/layout/activity_call.xml b/third_party/libwebrtc/examples/androidapp/res/layout/activity_call.xml
new file mode 100644
index 0000000000..bf811426f3
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/layout/activity_call.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!-- tools:ignore is needed because lint thinks this can be replaced with a merge. Replacing this
+     with a merge causes the fullscreen SurfaceView not to be centered. -->
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:ignore="MergeRootFrame">
+
+    <org.webrtc.SurfaceViewRenderer
+        android:id="@+id/fullscreen_video_view"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center" />
+
+    <org.webrtc.SurfaceViewRenderer
+        android:id="@+id/pip_video_view"
+        android:layout_height="144dp"
+        android:layout_width="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="16dp"/>
+
+    <FrameLayout
+        android:id="@+id/call_fragment_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+    <FrameLayout
+        android:id="@+id/hud_fragment_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</FrameLayout>
diff --git a/third_party/libwebrtc/examples/androidapp/res/layout/activity_connect.xml b/third_party/libwebrtc/examples/androidapp/res/layout/activity_connect.xml
new file mode 100644
index 0000000000..017e5cabff
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/layout/activity_connect.xml
@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_margin="16dp"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:weightSum="1"
+    android:layout_centerHorizontal="true">
+
+    <TextView
+        android:id="@+id/room_edittext_description"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/room_description"/>
+
+    <LinearLayout
+        android:orientation="horizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:layout_marginBottom="8dp">
+
+        <!-- TODO(crbug.com/900912): Fix and remove lint ignore -->
+        <EditText
+            tools:ignore="LabelFor,Autofill"
+            android:id="@+id/room_edittext"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:maxLines="1"
+            android:imeOptions="actionDone"
+            android:inputType="text"/>
+
+        <ImageButton
+            android:id="@+id/connect_button"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:contentDescription="@string/connect_description"
+            android:background="@android:drawable/sym_action_call" />
+
+        <ImageButton
+            android:id="@+id/add_favorite_button"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:contentDescription="@string/add_favorite_description"
+            android:background="@android:drawable/ic_input_add" />
+    </LinearLayout>
+
+    <TextView
+        android:id="@+id/room_listview_description"
+        android:layout_width="match_parent"
+        android:layout_height="48dp"
+        android:layout_marginTop="8dp"
+        android:lines="1"
+        android:maxLines="1"
+        android:textAppearance="?android:attr/textAppearanceMedium"
+        android:text="@string/favorites"
+        android:gravity="center_vertical"/>
+
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+
+        <ListView
+            android:id="@+id/room_listview"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:drawSelectorOnTop="false" />
+
+        <TextView
+            android:id="@android:id/empty"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:gravity="center"
+            android:text="@string/no_favorites" />
+    </FrameLayout>
+</LinearLayout>
diff --git a/third_party/libwebrtc/examples/androidapp/res/layout/fragment_call.xml b/third_party/libwebrtc/examples/androidapp/res/layout/fragment_call.xml
new file mode 100644
index 0000000000..90b1e9ca0e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/layout/fragment_call.xml
@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/contact_name_call"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:layout_above="@+id/buttons_call_container"
+        android:textSize="24sp"
+        android:layout_margin="8dp"/>
+
+    <LinearLayout
+           android:id="@+id/buttons_call_container"
+           android:orientation="horizontal"
+           android:layout_above="@+id/capture_format_text_call"
+           android:layout_alignWithParentIfMissing="true"
+           android:layout_marginBottom="32dp"
+           android:layout_centerHorizontal="true"
+           android:layout_width="wrap_content"
+           android:layout_height="wrap_content">
+
+       <ImageButton
+           android:id="@+id/button_call_disconnect"
+           android:background="@drawable/disconnect"
+           android:contentDescription="@string/disconnect_call"
+           android:layout_marginEnd="16dp"
+           android:layout_width="48dp"
+           android:layout_height="48dp"/>
+
+       <ImageButton
+           android:id="@+id/button_call_switch_camera"
+           android:background="@android:drawable/ic_menu_camera"
+           android:contentDescription="@string/switch_camera"
+           android:layout_marginEnd="8dp"
+           android:layout_width="48dp"
+           android:layout_height="48dp"/>
+
+        <ImageButton
+           android:id="@+id/button_call_scaling_mode"
+           android:background="@drawable/ic_action_return_from_full_screen"
+           android:contentDescription="@string/disconnect_call"
+           android:layout_width="48dp"
+           android:layout_height="48dp"/>
+
+       <ImageButton
+           android:id="@+id/button_call_toggle_mic"
+           android:background="@android:drawable/ic_btn_speak_now"
+           android:contentDescription="@string/toggle_mic"
+           android:layout_marginEnd="8dp"
+           android:layout_width="48dp"
+           android:layout_height="48dp"/>
+    </LinearLayout>
+
+    <TextView
+        android:id="@+id/capture_format_text_call"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:layout_above="@+id/capture_format_slider_call"
+        android:textSize="16sp"
+        android:text="@string/capture_format_change_text"/>
+
+    <SeekBar
+        android:id="@+id/capture_format_slider_call"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:layout_alignParentBottom="true"
+        android:progress="50"
+        android:layout_margin="8dp"/>
+
+</RelativeLayout>
diff --git a/third_party/libwebrtc/examples/androidapp/res/layout/fragment_hud.xml b/third_party/libwebrtc/examples/androidapp/res/layout/fragment_hud.xml
new file mode 100644
index 0000000000..483e7ba456
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/layout/fragment_hud.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ImageButton
+        android:id="@+id/button_toggle_debug"
+        android:background="@android:drawable/ic_menu_info_details"
+        android:contentDescription="@string/toggle_debug"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentStart="true"
+        android:layout_width="48dp"
+        android:layout_height="48dp"/>
+
+    <TextView
+        android:id="@+id/hud_stat_call"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentEnd="true"
+        android:textStyle="bold"
+        android:textColor="#C000FF00"
+        android:textSize="12sp"
+        android:layout_margin="8dp"/>
+
+</RelativeLayout>
diff --git a/third_party/libwebrtc/examples/androidapp/res/menu/connect_menu.xml b/third_party/libwebrtc/examples/androidapp/res/menu/connect_menu.xml
new file mode 100644
index 0000000000..a723f54941
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/menu/connect_menu.xml
@@ -0,0 +1,13 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/action_loopback"
+        android:icon="@drawable/ic_loopback_call"
+        android:showAsAction="always"
+        android:title="@string/action_loopback"/>
+    <item
+        android:id="@+id/action_settings"
+        android:orderInCategory="100"
+        android:icon="@android:drawable/ic_menu_preferences"
+        android:showAsAction="ifRoom"
+        android:title="@string/action_settings"/>
+</menu>
diff --git a/third_party/libwebrtc/examples/androidapp/res/values-v17/styles.xml b/third_party/libwebrtc/examples/androidapp/res/values-v17/styles.xml
new file mode 100644
index 0000000000..969b5012e9
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/values-v17/styles.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <style name="AppTheme" parent="android:Theme.Holo" />
+
+  <style name="CallActivityTheme" parent="android:Theme.Black">
+    <item name="android:windowActionBar">false</item>
+    <item name="android:windowFullscreen">true</item>
+    <item name="android:windowNoTitle">true</item>
+  </style>
+</resources>
diff --git a/third_party/libwebrtc/examples/androidapp/res/values-v21/styles.xml b/third_party/libwebrtc/examples/androidapp/res/values-v21/styles.xml
new file mode 100644
index 0000000000..b19af7e38f
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/values-v21/styles.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <style name="AppTheme" parent="android:Theme.Material" />
+</resources>
diff --git a/third_party/libwebrtc/examples/androidapp/res/values/arrays.xml b/third_party/libwebrtc/examples/androidapp/res/values/arrays.xml
new file mode 100644
index 0000000000..4a2948c875
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/values/arrays.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string-array name="videoResolutions">
+        <item>Default</item>
+        <item>4K (3840 x 2160)</item>
+        <item>Full HD (1920 x 1080)</item>
+        <item>HD (1280 x 720)</item>
+        <item>VGA (640 x 480)</item>
+        <item>QVGA (320 x 240)</item>
+    </string-array>
+
+    <string-array name="videoResolutionsValues">
+        <item>Default</item>
+        <item>3840 x 2160</item>
+        <item>1920 x 1080</item>
+        <item>1280 x 720</item>
+        <item>640 x 480</item>
+        <item>320 x 240</item>
+    </string-array>
+
+    <string-array name="cameraFps">
+        <item>Default</item>
+        <item>30 fps</item>
+        <item>15 fps</item>
+    </string-array>
+
+    <string-array name="startBitrate">
+        <item>Default</item>
+        <item>Manual</item>
+    </string-array>
+
+    <string-array name="videoCodecs">
+        <item>VP8</item>
+        <item>VP9</item>
+        <item>H264 Baseline</item>
+        <item>H264 High</item>
+        <item>AV1</item>
+    </string-array>
+
+    <string-array name="audioCodecs">
+        <item>OPUS</item>
+        <item>ISAC</item>
+    </string-array>
+
+    <string-array name="speakerphone">
+        <item>Auto (proximity sensor)</item>
+        <item>Enabled</item>
+        <item>Disabled</item>
+    </string-array>
+
+    <string-array name="speakerphoneValues">
+        <item>auto</item>
+        <item>true</item>
+        <item>false</item>
+    </string-array>
+
+    <string-array name="roomListContextMenu">
+        <item>Remove favorite</item>
+    </string-array>
+
+</resources>
diff --git a/third_party/libwebrtc/examples/androidapp/res/values/strings.xml b/third_party/libwebrtc/examples/androidapp/res/values/strings.xml
new file mode 100644
index 0000000000..814966f200
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/values/strings.xml
@@ -0,0 +1,224 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name" translatable="false">AppRTC</string>
+    <string name="settings_name" translatable="false">AppRTC Settings</string>
+    <string name="disconnect_call">Disconnect Call</string>
+    <string name="room_description">
+        Please enter a room name. Room names are shared with everyone, so think
+        of something unique and send it to a friend.
+    </string>
+    <string name="favorites">Favorites</string>
+    <string name="no_favorites">No favorites</string>
+    <string name="invalid_url_title">Invalid URL</string>
+    <string name="invalid_url_text">The URL or room name you entered resulted in an invalid URL: %1$s
+    </string>
+    <string name="channel_error_title">Connection error</string>
+    <string name="connecting_to">Connecting to: %1$s</string>
+    <string name="missing_url">FATAL ERROR: Missing URL to connect to.</string>
+    <string name="camera2_texture_only_error">Camera2 only supports capturing to texture. Either disable Camera2 or enable capturing to texture in the options.</string>
+    <string name="ok">OK</string>
+    <string name="switch_camera">Switch front/back camera</string>
+    <string name="capture_format_change_text">Slide to change capture format</string>
+    <string name="muted">Muted</string>
+    <string name="toggle_debug">Toggle debug view</string>
+    <string name="toggle_mic">Toggle microphone on/off</string>
+    <string name="action_settings">Settings</string>
+    <string name="action_loopback">Loopback connection</string>
+    <string name="connect_description">Connect to the room</string>
+    <string name="add_favorite_description">Add favorite</string>
+    <string name="format_description">%1$dx%2$d @ %3$d fps</string>
+    <string name="missing_permissions_try_again">The application is missing permissions. It might not work correctly. Do you want to try again?</string>
+    <string name="yes">Yes</string>
+    <string name="no">No</string>
+
+    <!-- Settings strings. -->
+    <string name="pref_room_key">room_preference</string>
+    <string name="pref_room_list_key">room_list_preference</string>
+
+    <string name="pref_videosettings_key">video_settings_key</string>
+    <string name="pref_videosettings_title">WebRTC video settings.</string>
+
+    <string name="pref_videocall_key">videocall_preference</string>
+    <string name="pref_videocall_title">Video call.</string>
+    <string name="pref_videocall_dlg">Enable video in a call.</string>
+    <string name="pref_videocall_default">true</string>
+
+    <string name="pref_screencapture_key">screencapture_preference</string>
+    <string name="pref_screencapture_title">Use screencapture.</string>
+    <string name="pref_screencapture_default">false</string>
+
+    <string name="pref_camera2_key">camera2_preference</string>
+    <string name="pref_camera2_title">Use Camera2.</string>
+    <string name="pref_camera2_default">true</string>
+    <string name="pref_camera2_not_supported">Not supported on this device.</string>
+
+    <string name="pref_resolution_key">resolution_preference</string>
+    <string name="pref_resolution_title">Video resolution.</string>
+    <string name="pref_resolution_dlg">Enter AppRTC local video resolution.</string>
+    <string name="pref_resolution_default">Default</string>
+
+    <string name="pref_fps_key">fps_preference</string>
+    <string name="pref_fps_title">Camera fps.</string>
+    <string name="pref_fps_dlg">Enter local camera fps.</string>
+    <string name="pref_fps_default">Default</string>
+
+    <string name="pref_capturequalityslider_key">capturequalityslider_preference</string>
+    <string name="pref_capturequalityslider_title">Capture quality slider.</string>
+    <string name="pref_capturequalityslider_dlg">Enable slider for changing capture quality.</string>
+    <string name="pref_capturequalityslider_default">false</string>
+
+    <string name="pref_maxvideobitrate_key">maxvideobitrate_preference</string>
+    <string name="pref_maxvideobitrate_title">Maximum video bitrate setting.</string>
+    <string name="pref_maxvideobitrate_dlg">Maximum video bitrate setting.</string>
+    <string name="pref_maxvideobitrate_default">Default</string>
+
+    <string name="pref_maxvideobitratevalue_key">maxvideobitratevalue_preference</string>
+    <string name="pref_maxvideobitratevalue_title">Video encoder maximum bitrate.</string>
+    <string name="pref_maxvideobitratevalue_dlg">Enter video encoder maximum bitrate in kbps.</string>
+    <string name="pref_maxvideobitratevalue_default">1700</string>
+
+    <string name="pref_videocodec_key">videocodec_preference</string>
+    <string name="pref_videocodec_title">Default video codec.</string>
+    <string name="pref_videocodec_dlg">Select default video codec.</string>
+    <string name="pref_videocodec_default">VP8</string>
+
+    <string name="pref_hwcodec_key">hwcodec_preference</string>
+    <string name="pref_hwcodec_title">Video codec hardware acceleration.</string>
+    <string name="pref_hwcodec_dlg">Use hardware accelerated video codec (if available).</string>
+    <string name="pref_hwcodec_default">true</string>
+
+    <string name="pref_capturetotexture_key">capturetotexture_preference</string>
+    <string name="pref_capturetotexture_title">Video capture to surface texture.</string>
+    <string name="pref_capturetotexture_dlg">Capture video to textures (if available).</string>
+    <string name="pref_capturetotexture_default">true</string>
+
+    <string name="pref_flexfec_key">flexfec_preference</string>
+    <string name="pref_flexfec_title">Codec-agnostic Flexible FEC.</string>
+    <string name="pref_flexfec_dlg">Enable FlexFEC.</string>
+    <string name="pref_flexfec_default">false</string>
+
+    <string name="pref_value_enabled">Enabled</string>
+    <string name="pref_value_disabled">Disabled</string>
+
+    <string name="pref_audiosettings_key">audio_settings_key</string>
+    <string name="pref_audiosettings_title">WebRTC audio settings.</string>
+
+    <string name="pref_startaudiobitrate_key">startaudiobitrate_preference</string>
+    <string name="pref_startaudiobitrate_title">Audio bitrate setting.</string>
+    <string name="pref_startaudiobitrate_dlg">Audio bitrate setting.</string>
+    <string name="pref_startaudiobitrate_default">Default</string>
+
+    <string name="pref_startaudiobitratevalue_key">startaudiobitratevalue_preference</string>
+    <string name="pref_startaudiobitratevalue_title">Audio codec bitrate.</string>
+    <string name="pref_startaudiobitratevalue_dlg">Enter audio codec bitrate in kbps.</string>
+    <string name="pref_startaudiobitratevalue_default">32</string>
+
+    <string name="pref_audiocodec_key">audiocodec_preference</string>
+    <string name="pref_audiocodec_title">Default audio codec.</string>
+    <string name="pref_audiocodec_dlg">Select default audio codec.</string>
+    <string name="pref_audiocodec_default">OPUS</string>
+
+    <string name="pref_noaudioprocessing_key">audioprocessing_preference</string>
+    <string name="pref_noaudioprocessing_title">Disable audio processing.</string>
+    <string name="pref_noaudioprocessing_dlg">Disable audio processing pipeline.</string>
+    <string name="pref_noaudioprocessing_default">false</string>
+
+    <string name="pref_aecdump_key">aecdump_preference</string>
+    <string name="pref_aecdump_title">Create aecdump.</string>
+    <string name="pref_aecdump_dlg">Enable diagnostic audio recordings.</string>
+    <string name="pref_aecdump_default">false</string>
+
+    <string name="pref_enable_save_input_audio_to_file_key">enable_key</string>
+    <string name="pref_enable_save_input_audio_to_file_title">Save input audio to file.</string>
+    <string name="pref_enable_save_input_audio_to_file_dlg">Save input audio to file.</string>
+    <string name="pref_enable_save_input_audio_to_file_default">false</string>
+
+    <string name="pref_opensles_key">opensles_preference</string>
+    <string name="pref_opensles_title">Use OpenSL ES for audio playback.</string>
+    <string name="pref_opensles_dlg">Use OpenSL ES for audio playback.</string>
+    <string name="pref_opensles_default">false</string>
+
+    <string name="pref_disable_built_in_aec_key">disable_built_in_aec_preference</string>
+    <string name="pref_disable_built_in_aec_title">Disable hardware AEC.</string>
+    <string name="pref_disable_built_in_aec_dlg">Disable hardware AEC.</string>
+    <string name="pref_disable_built_in_aec_default">false</string>
+    <string name="pref_built_in_aec_not_available">Hardware AEC is not available</string>
+
+    <string name="pref_disable_built_in_agc_key">disable_built_in_agc_preference</string>
+    <string name="pref_disable_built_in_agc_title">Disable hardware AGC.</string>
+    <string name="pref_disable_built_in_agc_dlg">Disable hardware AGC.</string>
+    <string name="pref_disable_built_in_agc_default">false</string>
+    <string name="pref_built_in_agc_not_available">Hardware AGC is not available</string>
+
+    <string name="pref_disable_built_in_ns_key">disable_built_in_ns_preference</string>
+    <string name="pref_disable_built_in_ns_title">Disable hardware NS.</string>
+    <string name="pref_disable_built_in_ns_dlg">Disable hardware NS.</string>
+    <string name="pref_disable_built_in_ns_default">false</string>
+    <string name="pref_built_in_ns_not_available">Hardware NS is not available</string>
+
+    <string name="pref_disable_webrtc_agc_and_hpf_key">disable_webrtc_agc_and_hpf_preference</string>
+    <string name="pref_disable_webrtc_agc_and_hpf_title">Disable WebRTC AGC and HPF.</string>
+    <string name="pref_disable_webrtc_agc_default">false</string>
+
+    <string name="pref_speakerphone_key">speakerphone_preference</string>
+    <string name="pref_speakerphone_title">Speakerphone.</string>
+    <string name="pref_speakerphone_dlg">Speakerphone.</string>
+    <string name="pref_speakerphone_default">auto</string>
+
+    <string name="pref_datasettings_key">data_settings_key</string>
+    <string name="pref_datasettings_title">WebRTC data channel settings.</string>
+
+    <string name="pref_enable_datachannel_key">enable_datachannel_preference</string>
+    <string name="pref_enable_datachannel_title">Enable datachannel.</string>
+    <string name="pref_enable_datachannel_default" translatable="false">true</string>
+
+    <string name="pref_ordered_key">ordered_preference</string>
+    <string name="pref_ordered_title">Order messages.</string>
+    <string name="pref_ordered_default" translatable="false">true</string>
+
+    <string name="pref_data_protocol_key">Subprotocol</string>
+    <string name="pref_data_protocol_title">Subprotocol.</string>
+    <string name="pref_data_protocol_dlg">Enter subprotocol.</string>
+    <string name="pref_data_protocol_default" translatable="false"></string>
+
+    <string name="pref_negotiated_key">negotiated_preference</string>
+    <string name="pref_negotiated_title">Negotiated.</string>
+    <string name="pref_negotiated_default" translatable="false">false</string>
+
+    <string name="pref_max_retransmit_time_ms_key">max_retransmit_time_ms_preference</string>
+    <string name="pref_max_retransmit_time_ms_title">Max delay to retransmit.</string>
+    <string name="pref_max_retransmit_time_ms_dlg">Enter max delay to retransmit (in ms).</string>
+    <string name="pref_max_retransmit_time_ms_default" translatable="false">-1</string>
+
+    <string name="pref_max_retransmits_key">max_retransmits_preference</string>
+    <string name="pref_max_retransmits_title">Max attempts to retransmit.</string>
+    <string name="pref_max_retransmits_dlg">Enter max attempts to retransmit.</string>
+    <string name="pref_max_retransmits_default" translatable="false">-1</string>
+
+    <string name="pref_data_id_key">data_id_preference</string>
+    <string name="pref_data_id_title">Data id.</string>
+    <string name="pref_data_id_dlg">Enter data channel id.</string>
+    <string name="pref_data_id_default" translatable="false">-1</string>
+
+    <string name="pref_miscsettings_key">misc_settings_key</string>
+    <string name="pref_miscsettings_title">Miscellaneous settings.</string>
+
+    <string name="pref_room_server_url_key">room_server_url_preference</string>
+    <string name="pref_room_server_url_title">Room server URL.</string>
+    <string name="pref_room_server_url_dlg">Enter a room server URL.</string>
+    <string name="pref_room_server_url_default" translatable="false">https://appr.tc</string>
+
+    <string name="pref_displayhud_key">displayhud_preference</string>
+    <string name="pref_displayhud_title">Display call statistics.</string>
+    <string name="pref_displayhud_dlg">Display call statistics.</string>
+    <string name="pref_displayhud_default" translatable="false">false</string>
+
+    <string name="pref_tracing_key">tracing_preference</string>
+    <string name="pref_tracing_title">Debug performance tracing.</string>
+    <string name="pref_tracing_dlg">Debug performance tracing.</string>
+    <string name="pref_tracing_default" translatable="false">false</string>
+
+    <string name="pref_enable_rtceventlog_key">enable_rtceventlog_key</string>
+    <string name="pref_enable_rtceventlog_title">Enable RtcEventLog.</string>
+    <string name="pref_enable_rtceventlog_default">false</string>
+</resources>
diff --git a/third_party/libwebrtc/examples/androidapp/res/xml/preferences.xml b/third_party/libwebrtc/examples/androidapp/res/xml/preferences.xml
new file mode 100644
index 0000000000..14e74d5c0b
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/res/xml/preferences.xml
@@ -0,0 +1,247 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <PreferenceCategory
+        android:key="@string/pref_videosettings_key"
+        android:title="@string/pref_videosettings_title">
+
+        <CheckBoxPreference
+            android:key="@string/pref_videocall_key"
+            android:title="@string/pref_videocall_title"
+            android:dialogTitle="@string/pref_videocall_dlg"
+            android:defaultValue="@string/pref_videocall_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_screencapture_key"
+            android:title="@string/pref_screencapture_title"
+            android:defaultValue="@string/pref_screencapture_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_camera2_key"
+            android:title="@string/pref_camera2_title"
+            android:defaultValue="@string/pref_camera2_default" />
+
+        <ListPreference
+            android:key="@string/pref_resolution_key"
+            android:title="@string/pref_resolution_title"
+            android:defaultValue="@string/pref_resolution_default"
+            android:dialogTitle="@string/pref_resolution_dlg"
+            android:entries="@array/videoResolutions"
+            android:entryValues="@array/videoResolutionsValues" />
+
+        <ListPreference
+            android:key="@string/pref_fps_key"
+            android:title="@string/pref_fps_title"
+            android:defaultValue="@string/pref_fps_default"
+            android:dialogTitle="@string/pref_fps_dlg"
+            android:entries="@array/cameraFps"
+            android:entryValues="@array/cameraFps" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_capturequalityslider_key"
+            android:title="@string/pref_capturequalityslider_title"
+            android:dialogTitle="@string/pref_capturequalityslider_dlg"
+            android:defaultValue="@string/pref_capturequalityslider_default" />
+
+        <ListPreference
+            android:key="@string/pref_maxvideobitrate_key"
+            android:title="@string/pref_maxvideobitrate_title"
+            android:defaultValue="@string/pref_maxvideobitrate_default"
+            android:dialogTitle="@string/pref_maxvideobitrate_dlg"
+            android:entries="@array/startBitrate"
+            android:entryValues="@array/startBitrate" />
+
+        <EditTextPreference
+            android:key="@string/pref_maxvideobitratevalue_key"
+            android:title="@string/pref_maxvideobitratevalue_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_maxvideobitratevalue_default"
+            android:dialogTitle="@string/pref_maxvideobitratevalue_dlg" />
+
+        <ListPreference
+            android:key="@string/pref_videocodec_key"
+            android:title="@string/pref_videocodec_title"
+            android:defaultValue="@string/pref_videocodec_default"
+            android:dialogTitle="@string/pref_videocodec_dlg"
+            android:entries="@array/videoCodecs"
+            android:entryValues="@array/videoCodecs" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_hwcodec_key"
+            android:title="@string/pref_hwcodec_title"
+            android:dialogTitle="@string/pref_hwcodec_dlg"
+            android:defaultValue="@string/pref_hwcodec_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_capturetotexture_key"
+            android:title="@string/pref_capturetotexture_title"
+            android:dialogTitle="@string/pref_capturetotexture_dlg"
+            android:defaultValue="@string/pref_capturetotexture_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_flexfec_key"
+            android:title="@string/pref_flexfec_title"
+            android:dialogTitle="@string/pref_flexfec_dlg"
+            android:defaultValue="@string/pref_flexfec_default" />
+    </PreferenceCategory>
+
+    <PreferenceCategory
+        android:key="@string/pref_audiosettings_key"
+        android:title="@string/pref_audiosettings_title">
+
+        <ListPreference
+            android:key="@string/pref_startaudiobitrate_key"
+            android:title="@string/pref_startaudiobitrate_title"
+            android:defaultValue="@string/pref_startaudiobitrate_default"
+            android:dialogTitle="@string/pref_startaudiobitrate_dlg"
+            android:entries="@array/startBitrate"
+            android:entryValues="@array/startBitrate" />
+
+        <EditTextPreference
+            android:key="@string/pref_startaudiobitratevalue_key"
+            android:title="@string/pref_startaudiobitratevalue_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_startaudiobitratevalue_default"
+            android:dialogTitle="@string/pref_startaudiobitratevalue_dlg" />
+
+        <ListPreference
+            android:key="@string/pref_audiocodec_key"
+            android:title="@string/pref_audiocodec_title"
+            android:defaultValue="@string/pref_audiocodec_default"
+            android:dialogTitle="@string/pref_audiocodec_dlg"
+            android:entries="@array/audioCodecs"
+            android:entryValues="@array/audioCodecs" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_noaudioprocessing_key"
+            android:title="@string/pref_noaudioprocessing_title"
+            android:dialogTitle="@string/pref_noaudioprocessing_dlg"
+            android:defaultValue="@string/pref_noaudioprocessing_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_aecdump_key"
+            android:title="@string/pref_aecdump_title"
+            android:dialogTitle="@string/pref_aecdump_dlg"
+            android:defaultValue="@string/pref_aecdump_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_enable_save_input_audio_to_file_key"
+            android:title="@string/pref_enable_save_input_audio_to_file_title"
+            android:dialogTitle="@string/pref_enable_save_input_audio_to_file_dlg"
+            android:defaultValue="@string/pref_enable_save_input_audio_to_file_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_opensles_key"
+            android:title="@string/pref_opensles_title"
+            android:dialogTitle="@string/pref_opensles_dlg"
+            android:defaultValue="@string/pref_opensles_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_disable_built_in_aec_key"
+            android:title="@string/pref_disable_built_in_aec_title"
+            android:dialogTitle="@string/pref_disable_built_in_aec_dlg"
+            android:defaultValue="@string/pref_disable_built_in_aec_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_disable_built_in_agc_key"
+            android:title="@string/pref_disable_built_in_agc_title"
+            android:dialogTitle="@string/pref_disable_built_in_agc_dlg"
+            android:defaultValue="@string/pref_disable_built_in_agc_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_disable_built_in_ns_key"
+            android:title="@string/pref_disable_built_in_ns_title"
+            android:dialogTitle="@string/pref_disable_built_in_ns_dlg"
+            android:defaultValue="@string/pref_disable_built_in_ns_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_disable_webrtc_agc_and_hpf_key"
+            android:title="@string/pref_disable_webrtc_agc_and_hpf_title"
+            android:defaultValue="@string/pref_disable_webrtc_agc_default" />
+
+        <ListPreference
+            android:key="@string/pref_speakerphone_key"
+            android:title="@string/pref_speakerphone_title"
+            android:defaultValue="@string/pref_speakerphone_default"
+            android:dialogTitle="@string/pref_speakerphone_dlg"
+            android:entries="@array/speakerphone"
+            android:entryValues="@array/speakerphoneValues" />
+    </PreferenceCategory>
+
+    <PreferenceCategory
+        android:key="@string/pref_datasettings_key"
+        android:title="@string/pref_datasettings_title">
+
+        <CheckBoxPreference
+            android:key="@string/pref_enable_datachannel_key"
+            android:title="@string/pref_enable_datachannel_title"
+            android:defaultValue="@string/pref_enable_datachannel_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_ordered_key"
+            android:title="@string/pref_ordered_title"
+            android:defaultValue="@string/pref_ordered_default" />
+
+        <EditTextPreference
+            android:key="@string/pref_data_protocol_key"
+            android:title="@string/pref_data_protocol_title"
+            android:inputType="text"
+            android:defaultValue="@string/pref_data_protocol_default"
+            android:dialogTitle="@string/pref_data_protocol_dlg" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_negotiated_key"
+            android:title="@string/pref_negotiated_title"
+            android:defaultValue="@string/pref_negotiated_default" />
+
+        <EditTextPreference
+            android:key="@string/pref_max_retransmit_time_ms_key"
+            android:title="@string/pref_max_retransmit_time_ms_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_max_retransmit_time_ms_default"
+            android:dialogTitle="@string/pref_max_retransmit_time_ms_dlg" />
+
+        <EditTextPreference
+            android:key="@string/pref_max_retransmits_key"
+            android:title="@string/pref_max_retransmits_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_max_retransmits_default"
+            android:dialogTitle="@string/pref_max_retransmits_dlg" />
+
+        <EditTextPreference
+            android:key="@string/pref_data_id_key"
+            android:title="@string/pref_data_id_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_data_id_default"
+            android:dialogTitle="@string/pref_data_id_dlg" />
+    </PreferenceCategory>
+
+    <PreferenceCategory
+        android:key="@string/pref_miscsettings_key"
+        android:title="@string/pref_miscsettings_title">
+
+        <EditTextPreference
+            android:key="@string/pref_room_server_url_key"
+            android:title="@string/pref_room_server_url_title"
+            android:inputType="text"
+            android:defaultValue="@string/pref_room_server_url_default"
+            android:dialogTitle="@string/pref_room_server_url_dlg" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_displayhud_key"
+            android:title="@string/pref_displayhud_title"
+            android:dialogTitle="@string/pref_displayhud_dlg"
+            android:defaultValue="@string/pref_displayhud_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_tracing_key"
+            android:title="@string/pref_tracing_title"
+            android:dialogTitle="@string/pref_tracing_dlg"
+            android:defaultValue="@string/pref_tracing_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_enable_rtceventlog_key"
+            android:title="@string/pref_enable_rtceventlog_title"
+            android:defaultValue="@string/pref_enable_rtceventlog_default"/>
+    </PreferenceCategory>
+
+</PreferenceScreen>
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCAudioManager.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCAudioManager.java
new file mode 100644
index 0000000000..2536b131a1
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCAudioManager.java
@@ -0,0 +1,594 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.SharedPreferences;
+import android.content.pm.PackageManager;
+import android.media.AudioDeviceInfo;
+import android.media.AudioManager;
+import android.os.Build;
+import android.preference.PreferenceManager;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import org.appspot.apprtc.util.AppRTCUtils;
+import org.webrtc.ThreadUtils;
+
+/**
+ * AppRTCAudioManager manages all audio related parts of the AppRTC demo.
+ */
+public class AppRTCAudioManager {
+  private static final String TAG = "AppRTCAudioManager";
+  private static final String SPEAKERPHONE_AUTO = "auto";
+  private static final String SPEAKERPHONE_TRUE = "true";
+  private static final String SPEAKERPHONE_FALSE = "false";
+
+  /**
+   * AudioDevice is the names of possible audio devices that we currently
+   * support.
+   */
+  public enum AudioDevice { SPEAKER_PHONE, WIRED_HEADSET, EARPIECE, BLUETOOTH, NONE }
+
+  /** AudioManager state. */
+  public enum AudioManagerState {
+    UNINITIALIZED,
+    PREINITIALIZED,
+    RUNNING,
+  }
+
+  /** Selected audio device change event. */
+  public interface AudioManagerEvents {
+    // Callback fired once audio device is changed or list of available audio devices changed.
+    void onAudioDeviceChanged(
+        AudioDevice selectedAudioDevice, Set<AudioDevice> availableAudioDevices);
+  }
+
+  private final Context apprtcContext;
+  @Nullable
+  private AudioManager audioManager;
+
+  @Nullable
+  private AudioManagerEvents audioManagerEvents;
+  private AudioManagerState amState;
+  private int savedAudioMode = AudioManager.MODE_INVALID;
+  private boolean savedIsSpeakerPhoneOn;
+  private boolean savedIsMicrophoneMute;
+  private boolean hasWiredHeadset;
+
+  // Default audio device; speaker phone for video calls or earpiece for audio
+  // only calls.
+  private AudioDevice defaultAudioDevice;
+
+  // Contains the currently selected audio device.
+  // This device is changed automatically using a certain scheme where e.g.
+  // a wired headset "wins" over speaker phone. It is also possible for a
+  // user to explicitly select a device (and overrid any predefined scheme).
+  // See `userSelectedAudioDevice` for details.
+  private AudioDevice selectedAudioDevice;
+
+  // Contains the user-selected audio device which overrides the predefined
+  // selection scheme.
+  // TODO(henrika): always set to AudioDevice.NONE today. Add support for
+  // explicit selection based on choice by userSelectedAudioDevice.
+  private AudioDevice userSelectedAudioDevice;
+
+  // Contains speakerphone setting: auto, true or false
+  @Nullable private final String useSpeakerphone;
+
+  // Proximity sensor object. It measures the proximity of an object in cm
+  // relative to the view screen of a device and can therefore be used to
+  // assist device switching (close to ear <=> use headset earpiece if
+  // available, far from ear <=> use speaker phone).
+  @Nullable private AppRTCProximitySensor proximitySensor;
+
+  // Handles all tasks related to Bluetooth headset devices.
+  private final AppRTCBluetoothManager bluetoothManager;
+
+  // Contains a list of available audio devices. A Set collection is used to
+  // avoid duplicate elements.
+  private Set<AudioDevice> audioDevices = new HashSet<>();
+
+  // Broadcast receiver for wired headset intent broadcasts.
+  private BroadcastReceiver wiredHeadsetReceiver;
+
+  // Callback method for changes in audio focus.
+  @Nullable
+  private AudioManager.OnAudioFocusChangeListener audioFocusChangeListener;
+
+  /**
+   * This method is called when the proximity sensor reports a state change,
+   * e.g. from "NEAR to FAR" or from "FAR to NEAR".
+   */
+  private void onProximitySensorChangedState() {
+    if (!useSpeakerphone.equals(SPEAKERPHONE_AUTO)) {
+      return;
+    }
+
+    // The proximity sensor should only be activated when there are exactly two
+    // available audio devices.
+    if (audioDevices.size() == 2 && audioDevices.contains(AppRTCAudioManager.AudioDevice.EARPIECE)
+        && audioDevices.contains(AppRTCAudioManager.AudioDevice.SPEAKER_PHONE)) {
+      if (proximitySensor.sensorReportsNearState()) {
+        // Sensor reports that a "handset is being held up to a person's ear",
+        // or "something is covering the light sensor".
+        setAudioDeviceInternal(AppRTCAudioManager.AudioDevice.EARPIECE);
+      } else {
+        // Sensor reports that a "handset is removed from a person's ear", or
+        // "the light sensor is no longer covered".
+        setAudioDeviceInternal(AppRTCAudioManager.AudioDevice.SPEAKER_PHONE);
+      }
+    }
+  }
+
+  /* Receiver which handles changes in wired headset availability. */
+  private class WiredHeadsetReceiver extends BroadcastReceiver {
+    private static final int STATE_UNPLUGGED = 0;
+    private static final int STATE_PLUGGED = 1;
+    private static final int HAS_NO_MIC = 0;
+    private static final int HAS_MIC = 1;
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+      int state = intent.getIntExtra("state", STATE_UNPLUGGED);
+      int microphone = intent.getIntExtra("microphone", HAS_NO_MIC);
+      String name = intent.getStringExtra("name");
+      Log.d(TAG, "WiredHeadsetReceiver.onReceive" + AppRTCUtils.getThreadInfo() + ": "
+              + "a=" + intent.getAction() + ", s="
+              + (state == STATE_UNPLUGGED ? "unplugged" : "plugged") + ", m="
+              + (microphone == HAS_MIC ? "mic" : "no mic") + ", n=" + name + ", sb="
+              + isInitialStickyBroadcast());
+      hasWiredHeadset = (state == STATE_PLUGGED);
+      updateAudioDeviceState();
+    }
+  }
+
+  /** Construction. */
+  static AppRTCAudioManager create(Context context) {
+    return new AppRTCAudioManager(context);
+  }
+
+  private AppRTCAudioManager(Context context) {
+    Log.d(TAG, "ctor");
+    ThreadUtils.checkIsOnMainThread();
+    apprtcContext = context;
+    audioManager = ((AudioManager) context.getSystemService(Context.AUDIO_SERVICE));
+    bluetoothManager = AppRTCBluetoothManager.create(context, this);
+    wiredHeadsetReceiver = new WiredHeadsetReceiver();
+    amState = AudioManagerState.UNINITIALIZED;
+
+    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
+    useSpeakerphone = sharedPreferences.getString(context.getString(R.string.pref_speakerphone_key),
+        context.getString(R.string.pref_speakerphone_default));
+    Log.d(TAG, "useSpeakerphone: " + useSpeakerphone);
+    if (useSpeakerphone.equals(SPEAKERPHONE_FALSE)) {
+      defaultAudioDevice = AudioDevice.EARPIECE;
+    } else {
+      defaultAudioDevice = AudioDevice.SPEAKER_PHONE;
+    }
+
+    // Create and initialize the proximity sensor.
+    // Tablet devices (e.g. Nexus 7) does not support proximity sensors.
+    // Note that, the sensor will not be active until start() has been called.
+    proximitySensor = AppRTCProximitySensor.create(context,
+        // This method will be called each time a state change is detected.
+        // Example: user holds their hand over the device (closer than ~5 cm),
+        // or removes their hand from the device.
+        this ::onProximitySensorChangedState);
+
+    Log.d(TAG, "defaultAudioDevice: " + defaultAudioDevice);
+    AppRTCUtils.logDeviceInfo(TAG);
+  }
+
+  @SuppressWarnings("deprecation") // TODO(henrika): audioManager.requestAudioFocus() is deprecated.
+  public void start(AudioManagerEvents audioManagerEvents) {
+    Log.d(TAG, "start");
+    ThreadUtils.checkIsOnMainThread();
+    if (amState == AudioManagerState.RUNNING) {
+      Log.e(TAG, "AudioManager is already active");
+      return;
+    }
+    // TODO(henrika): perhaps call new method called preInitAudio() here if UNINITIALIZED.
+
+    Log.d(TAG, "AudioManager starts...");
+    this.audioManagerEvents = audioManagerEvents;
+    amState = AudioManagerState.RUNNING;
+
+    // Store current audio state so we can restore it when stop() is called.
+    savedAudioMode = audioManager.getMode();
+    savedIsSpeakerPhoneOn = audioManager.isSpeakerphoneOn();
+    savedIsMicrophoneMute = audioManager.isMicrophoneMute();
+    hasWiredHeadset = hasWiredHeadset();
+
+    // Create an AudioManager.OnAudioFocusChangeListener instance.
+    audioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
+      // Called on the listener to notify if the audio focus for this listener has been changed.
+      // The `focusChange` value indicates whether the focus was gained, whether the focus was lost,
+      // and whether that loss is transient, or whether the new focus holder will hold it for an
+      // unknown amount of time.
+      // TODO(henrika): possibly extend support of handling audio-focus changes. Only contains
+      // logging for now.
+      @Override
+      public void onAudioFocusChange(int focusChange) {
+        final String typeOfChange;
+        switch (focusChange) {
+          case AudioManager.AUDIOFOCUS_GAIN:
+            typeOfChange = "AUDIOFOCUS_GAIN";
+            break;
+          case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT:
+            typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT";
+            break;
+          case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE:
+            typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE";
+            break;
+          case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK:
+            typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK";
+            break;
+          case AudioManager.AUDIOFOCUS_LOSS:
+            typeOfChange = "AUDIOFOCUS_LOSS";
+            break;
+          case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
+            typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT";
+            break;
+          case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
+            typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK";
+            break;
+          default:
+            typeOfChange = "AUDIOFOCUS_INVALID";
+            break;
+        }
+        Log.d(TAG, "onAudioFocusChange: " + typeOfChange);
+      }
+    };
+
+    // Request audio playout focus (without ducking) and install listener for changes in focus.
+    int result = audioManager.requestAudioFocus(audioFocusChangeListener,
+        AudioManager.STREAM_VOICE_CALL, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
+    if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+      Log.d(TAG, "Audio focus request granted for VOICE_CALL streams");
+    } else {
+      Log.e(TAG, "Audio focus request failed");
+    }
+
+    // Start by setting MODE_IN_COMMUNICATION as default audio mode. It is
+    // required to be in this mode when playout and/or recording starts for
+    // best possible VoIP performance.
+    audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
+
+    // Always disable microphone mute during a WebRTC call.
+    setMicrophoneMute(false);
+
+    // Set initial device states.
+    userSelectedAudioDevice = AudioDevice.NONE;
+    selectedAudioDevice = AudioDevice.NONE;
+    audioDevices.clear();
+
+    // Initialize and start Bluetooth if a BT device is available or initiate
+    // detection of new (enabled) BT devices.
+    bluetoothManager.start();
+
+    // Do initial selection of audio device. This setting can later be changed
+    // either by adding/removing a BT or wired headset or by covering/uncovering
+    // the proximity sensor.
+    updateAudioDeviceState();
+
+    // Register receiver for broadcast intents related to adding/removing a
+    // wired headset.
+    registerReceiver(wiredHeadsetReceiver, new IntentFilter(Intent.ACTION_HEADSET_PLUG));
+    Log.d(TAG, "AudioManager started");
+  }
+
+  @SuppressWarnings("deprecation") // TODO(henrika): audioManager.abandonAudioFocus() is deprecated.
+  public void stop() {
+    Log.d(TAG, "stop");
+    ThreadUtils.checkIsOnMainThread();
+    if (amState != AudioManagerState.RUNNING) {
+      Log.e(TAG, "Trying to stop AudioManager in incorrect state: " + amState);
+      return;
+    }
+    amState = AudioManagerState.UNINITIALIZED;
+
+    unregisterReceiver(wiredHeadsetReceiver);
+
+    bluetoothManager.stop();
+
+    // Restore previously stored audio states.
+    setSpeakerphoneOn(savedIsSpeakerPhoneOn);
+    setMicrophoneMute(savedIsMicrophoneMute);
+    audioManager.setMode(savedAudioMode);
+
+    // Abandon audio focus. Gives the previous focus owner, if any, focus.
+    audioManager.abandonAudioFocus(audioFocusChangeListener);
+    audioFocusChangeListener = null;
+    Log.d(TAG, "Abandoned audio focus for VOICE_CALL streams");
+
+    if (proximitySensor != null) {
+      proximitySensor.stop();
+      proximitySensor = null;
+    }
+
+    audioManagerEvents = null;
+    Log.d(TAG, "AudioManager stopped");
+  }
+
+  /** Changes selection of the currently active audio device. */
+  private void setAudioDeviceInternal(AudioDevice device) {
+    Log.d(TAG, "setAudioDeviceInternal(device=" + device + ")");
+    AppRTCUtils.assertIsTrue(audioDevices.contains(device));
+
+    switch (device) {
+      case SPEAKER_PHONE:
+        setSpeakerphoneOn(true);
+        break;
+      case EARPIECE:
+        setSpeakerphoneOn(false);
+        break;
+      case WIRED_HEADSET:
+        setSpeakerphoneOn(false);
+        break;
+      case BLUETOOTH:
+        setSpeakerphoneOn(false);
+        break;
+      default:
+        Log.e(TAG, "Invalid audio device selection");
+        break;
+    }
+    selectedAudioDevice = device;
+  }
+
+  /**
+   * Changes default audio device.
+   * TODO(henrika): add usage of this method in the AppRTCMobile client.
+   */
+  public void setDefaultAudioDevice(AudioDevice defaultDevice) {
+    ThreadUtils.checkIsOnMainThread();
+    switch (defaultDevice) {
+      case SPEAKER_PHONE:
+        defaultAudioDevice = defaultDevice;
+        break;
+      case EARPIECE:
+        if (hasEarpiece()) {
+          defaultAudioDevice = defaultDevice;
+        } else {
+          defaultAudioDevice = AudioDevice.SPEAKER_PHONE;
+        }
+        break;
+      default:
+        Log.e(TAG, "Invalid default audio device selection");
+        break;
+    }
+    Log.d(TAG, "setDefaultAudioDevice(device=" + defaultAudioDevice + ")");
+    updateAudioDeviceState();
+  }
+
+  /** Changes selection of the currently active audio device. */
+  public void selectAudioDevice(AudioDevice device) {
+    ThreadUtils.checkIsOnMainThread();
+    if (!audioDevices.contains(device)) {
+      Log.e(TAG, "Can not select " + device + " from available " + audioDevices);
+    }
+    userSelectedAudioDevice = device;
+    updateAudioDeviceState();
+  }
+
+  /** Returns current set of available/selectable audio devices. */
+  public Set<AudioDevice> getAudioDevices() {
+    ThreadUtils.checkIsOnMainThread();
+    return Collections.unmodifiableSet(new HashSet<>(audioDevices));
+  }
+
+  /** Returns the currently selected audio device. */
+  public AudioDevice getSelectedAudioDevice() {
+    ThreadUtils.checkIsOnMainThread();
+    return selectedAudioDevice;
+  }
+
+  /** Helper method for receiver registration. */
+  private void registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
+    apprtcContext.registerReceiver(receiver, filter);
+  }
+
+  /** Helper method for unregistration of an existing receiver. */
+  private void unregisterReceiver(BroadcastReceiver receiver) {
+    apprtcContext.unregisterReceiver(receiver);
+  }
+
+  /** Sets the speaker phone mode. */
+  private void setSpeakerphoneOn(boolean on) {
+    boolean wasOn = audioManager.isSpeakerphoneOn();
+    if (wasOn == on) {
+      return;
+    }
+    audioManager.setSpeakerphoneOn(on);
+  }
+
+  /** Sets the microphone mute state. */
+  private void setMicrophoneMute(boolean on) {
+    boolean wasMuted = audioManager.isMicrophoneMute();
+    if (wasMuted == on) {
+      return;
+    }
+    audioManager.setMicrophoneMute(on);
+  }
+
+  /** Gets the current earpiece state. */
+  private boolean hasEarpiece() {
+    return apprtcContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TELEPHONY);
+  }
+
+  /**
+   * Checks whether a wired headset is connected or not.
+   * This is not a valid indication that audio playback is actually over
+   * the wired headset as audio routing depends on other conditions. We
+   * only use it as an early indicator (during initialization) of an attached
+   * wired headset.
+   */
+  @Deprecated
+  private boolean hasWiredHeadset() {
+    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
+      return audioManager.isWiredHeadsetOn();
+    } else {
+      final AudioDeviceInfo[] devices = audioManager.getDevices(AudioManager.GET_DEVICES_ALL);
+      for (AudioDeviceInfo device : devices) {
+        final int type = device.getType();
+        if (type == AudioDeviceInfo.TYPE_WIRED_HEADSET) {
+          Log.d(TAG, "hasWiredHeadset: found wired headset");
+          return true;
+        } else if (type == AudioDeviceInfo.TYPE_USB_DEVICE) {
+          Log.d(TAG, "hasWiredHeadset: found USB audio device");
+          return true;
+        }
+      }
+      return false;
+    }
+  }
+
+  /**
+   * Updates list of possible audio devices and make new device selection.
+   * TODO(henrika): add unit test to verify all state transitions.
+   */
+  public void updateAudioDeviceState() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "--- updateAudioDeviceState: "
+            + "wired headset=" + hasWiredHeadset + ", "
+            + "BT state=" + bluetoothManager.getState());
+    Log.d(TAG, "Device status: "
+            + "available=" + audioDevices + ", "
+            + "selected=" + selectedAudioDevice + ", "
+            + "user selected=" + userSelectedAudioDevice);
+
+    // Check if any Bluetooth headset is connected. The internal BT state will
+    // change accordingly.
+    // TODO(henrika): perhaps wrap required state into BT manager.
+    if (bluetoothManager.getState() == AppRTCBluetoothManager.State.HEADSET_AVAILABLE
+        || bluetoothManager.getState() == AppRTCBluetoothManager.State.HEADSET_UNAVAILABLE
+        || bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_DISCONNECTING) {
+      bluetoothManager.updateDevice();
+    }
+
+    // Update the set of available audio devices.
+    Set<AudioDevice> newAudioDevices = new HashSet<>();
+
+    if (bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_CONNECTED
+        || bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_CONNECTING
+        || bluetoothManager.getState() == AppRTCBluetoothManager.State.HEADSET_AVAILABLE) {
+      newAudioDevices.add(AudioDevice.BLUETOOTH);
+    }
+
+    if (hasWiredHeadset) {
+      // If a wired headset is connected, then it is the only possible option.
+      newAudioDevices.add(AudioDevice.WIRED_HEADSET);
+    } else {
+      // No wired headset, hence the audio-device list can contain speaker
+      // phone (on a tablet), or speaker phone and earpiece (on mobile phone).
+      newAudioDevices.add(AudioDevice.SPEAKER_PHONE);
+      if (hasEarpiece()) {
+        newAudioDevices.add(AudioDevice.EARPIECE);
+      }
+    }
+    // Store state which is set to true if the device list has changed.
+    boolean audioDeviceSetUpdated = !audioDevices.equals(newAudioDevices);
+    // Update the existing audio device set.
+    audioDevices = newAudioDevices;
+    // Correct user selected audio devices if needed.
+    if (bluetoothManager.getState() == AppRTCBluetoothManager.State.HEADSET_UNAVAILABLE
+        && userSelectedAudioDevice == AudioDevice.BLUETOOTH) {
+      // If BT is not available, it can't be the user selection.
+      userSelectedAudioDevice = AudioDevice.NONE;
+    }
+    if (hasWiredHeadset && userSelectedAudioDevice == AudioDevice.SPEAKER_PHONE) {
+      // If user selected speaker phone, but then plugged wired headset then make
+      // wired headset as user selected device.
+      userSelectedAudioDevice = AudioDevice.WIRED_HEADSET;
+    }
+    if (!hasWiredHeadset && userSelectedAudioDevice == AudioDevice.WIRED_HEADSET) {
+      // If user selected wired headset, but then unplugged wired headset then make
+      // speaker phone as user selected device.
+      userSelectedAudioDevice = AudioDevice.SPEAKER_PHONE;
+    }
+
+    // Need to start Bluetooth if it is available and user either selected it explicitly or
+    // user did not select any output device.
+    boolean needBluetoothAudioStart =
+        bluetoothManager.getState() == AppRTCBluetoothManager.State.HEADSET_AVAILABLE
+        && (userSelectedAudioDevice == AudioDevice.NONE
+               || userSelectedAudioDevice == AudioDevice.BLUETOOTH);
+
+    // Need to stop Bluetooth audio if user selected different device and
+    // Bluetooth SCO connection is established or in the process.
+    boolean needBluetoothAudioStop =
+        (bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_CONNECTED
+            || bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_CONNECTING)
+        && (userSelectedAudioDevice != AudioDevice.NONE
+               && userSelectedAudioDevice != AudioDevice.BLUETOOTH);
+
+    if (bluetoothManager.getState() == AppRTCBluetoothManager.State.HEADSET_AVAILABLE
+        || bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_CONNECTING
+        || bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_CONNECTED) {
+      Log.d(TAG, "Need BT audio: start=" + needBluetoothAudioStart + ", "
+              + "stop=" + needBluetoothAudioStop + ", "
+              + "BT state=" + bluetoothManager.getState());
+    }
+
+    // Start or stop Bluetooth SCO connection given states set earlier.
+    if (needBluetoothAudioStop) {
+      bluetoothManager.stopScoAudio();
+      bluetoothManager.updateDevice();
+    }
+
+    if (needBluetoothAudioStart && !needBluetoothAudioStop) {
+      // Attempt to start Bluetooth SCO audio (takes a few second to start).
+      if (!bluetoothManager.startScoAudio()) {
+        // Remove BLUETOOTH from list of available devices since SCO failed.
+        audioDevices.remove(AudioDevice.BLUETOOTH);
+        audioDeviceSetUpdated = true;
+      }
+    }
+
+    // Update selected audio device.
+    final AudioDevice newAudioDevice;
+
+    if (bluetoothManager.getState() == AppRTCBluetoothManager.State.SCO_CONNECTED) {
+      // If a Bluetooth is connected, then it should be used as output audio
+      // device. Note that it is not sufficient that a headset is available;
+      // an active SCO channel must also be up and running.
+      newAudioDevice = AudioDevice.BLUETOOTH;
+    } else if (hasWiredHeadset) {
+      // If a wired headset is connected, but Bluetooth is not, then wired headset is used as
+      // audio device.
+      newAudioDevice = AudioDevice.WIRED_HEADSET;
+    } else {
+      // No wired headset and no Bluetooth, hence the audio-device list can contain speaker
+      // phone (on a tablet), or speaker phone and earpiece (on mobile phone).
+      // `defaultAudioDevice` contains either AudioDevice.SPEAKER_PHONE or AudioDevice.EARPIECE
+      // depending on the user's selection.
+      newAudioDevice = defaultAudioDevice;
+    }
+    // Switch to new device but only if there has been any changes.
+    if (newAudioDevice != selectedAudioDevice || audioDeviceSetUpdated) {
+      // Do the required device switch.
+      setAudioDeviceInternal(newAudioDevice);
+      Log.d(TAG, "New device status: "
+              + "available=" + audioDevices + ", "
+              + "selected=" + newAudioDevice);
+      if (audioManagerEvents != null) {
+        // Notify a listening client that audio device has been changed.
+        audioManagerEvents.onAudioDeviceChanged(selectedAudioDevice, audioDevices);
+      }
+    }
+    Log.d(TAG, "--- updateAudioDeviceState done");
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCBluetoothManager.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCBluetoothManager.java
new file mode 100644
index 0000000000..e9077d8bd6
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCBluetoothManager.java
@@ -0,0 +1,532 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.annotation.SuppressLint;
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.bluetooth.BluetoothHeadset;
+import android.bluetooth.BluetoothProfile;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.media.AudioManager;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Process;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import java.util.List;
+import java.util.Set;
+import org.appspot.apprtc.util.AppRTCUtils;
+import org.webrtc.ThreadUtils;
+
+/**
+ * AppRTCProximitySensor manages functions related to Bluetoth devices in the
+ * AppRTC demo.
+ */
+public class AppRTCBluetoothManager {
+  private static final String TAG = "AppRTCBluetoothManager";
+
+  // Timeout interval for starting or stopping audio to a Bluetooth SCO device.
+  private static final int BLUETOOTH_SCO_TIMEOUT_MS = 4000;
+  // Maximum number of SCO connection attempts.
+  private static final int MAX_SCO_CONNECTION_ATTEMPTS = 2;
+
+  // Bluetooth connection state.
+  public enum State {
+    // Bluetooth is not available; no adapter or Bluetooth is off.
+    UNINITIALIZED,
+    // Bluetooth error happened when trying to start Bluetooth.
+    ERROR,
+    // Bluetooth proxy object for the Headset profile exists, but no connected headset devices,
+    // SCO is not started or disconnected.
+    HEADSET_UNAVAILABLE,
+    // Bluetooth proxy object for the Headset profile connected, connected Bluetooth headset
+    // present, but SCO is not started or disconnected.
+    HEADSET_AVAILABLE,
+    // Bluetooth audio SCO connection with remote device is closing.
+    SCO_DISCONNECTING,
+    // Bluetooth audio SCO connection with remote device is initiated.
+    SCO_CONNECTING,
+    // Bluetooth audio SCO connection with remote device is established.
+    SCO_CONNECTED
+  }
+
+  private final Context apprtcContext;
+  private final AppRTCAudioManager apprtcAudioManager;
+  @Nullable
+  private final AudioManager audioManager;
+  private final Handler handler;
+
+  int scoConnectionAttempts;
+  private State bluetoothState;
+  private final BluetoothProfile.ServiceListener bluetoothServiceListener;
+  @Nullable
+  private BluetoothAdapter bluetoothAdapter;
+  @Nullable
+  private BluetoothHeadset bluetoothHeadset;
+  @Nullable
+  private BluetoothDevice bluetoothDevice;
+  private final BroadcastReceiver bluetoothHeadsetReceiver;
+
+  // Runs when the Bluetooth timeout expires. We use that timeout after calling
+  // startScoAudio() or stopScoAudio() because we're not guaranteed to get a
+  // callback after those calls.
+  private final Runnable bluetoothTimeoutRunnable = new Runnable() {
+    @Override
+    public void run() {
+      bluetoothTimeout();
+    }
+  };
+
+  /**
+   * Implementation of an interface that notifies BluetoothProfile IPC clients when they have been
+   * connected to or disconnected from the service.
+   */
+  private class BluetoothServiceListener implements BluetoothProfile.ServiceListener {
+    @Override
+    // Called to notify the client when the proxy object has been connected to the service.
+    // Once we have the profile proxy object, we can use it to monitor the state of the
+    // connection and perform other operations that are relevant to the headset profile.
+    public void onServiceConnected(int profile, BluetoothProfile proxy) {
+      if (profile != BluetoothProfile.HEADSET || bluetoothState == State.UNINITIALIZED) {
+        return;
+      }
+      Log.d(TAG, "BluetoothServiceListener.onServiceConnected: BT state=" + bluetoothState);
+      // Android only supports one connected Bluetooth Headset at a time.
+      bluetoothHeadset = (BluetoothHeadset) proxy;
+      updateAudioDeviceState();
+      Log.d(TAG, "onServiceConnected done: BT state=" + bluetoothState);
+    }
+
+    @Override
+    /** Notifies the client when the proxy object has been disconnected from the service. */
+    public void onServiceDisconnected(int profile) {
+      if (profile != BluetoothProfile.HEADSET || bluetoothState == State.UNINITIALIZED) {
+        return;
+      }
+      Log.d(TAG, "BluetoothServiceListener.onServiceDisconnected: BT state=" + bluetoothState);
+      stopScoAudio();
+      bluetoothHeadset = null;
+      bluetoothDevice = null;
+      bluetoothState = State.HEADSET_UNAVAILABLE;
+      updateAudioDeviceState();
+      Log.d(TAG, "onServiceDisconnected done: BT state=" + bluetoothState);
+    }
+  }
+
+  // Intent broadcast receiver which handles changes in Bluetooth device availability.
+  // Detects headset changes and Bluetooth SCO state changes.
+  private class BluetoothHeadsetBroadcastReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+      if (bluetoothState == State.UNINITIALIZED) {
+        return;
+      }
+      final String action = intent.getAction();
+      // Change in connection state of the Headset profile. Note that the
+      // change does not tell us anything about whether we're streaming
+      // audio to BT over SCO. Typically received when user turns on a BT
+      // headset while audio is active using another audio device.
+      if (action.equals(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED)) {
+        final int state =
+            intent.getIntExtra(BluetoothHeadset.EXTRA_STATE, BluetoothHeadset.STATE_DISCONNECTED);
+        Log.d(TAG, "BluetoothHeadsetBroadcastReceiver.onReceive: "
+                + "a=ACTION_CONNECTION_STATE_CHANGED, "
+                + "s=" + stateToString(state) + ", "
+                + "sb=" + isInitialStickyBroadcast() + ", "
+                + "BT state: " + bluetoothState);
+        if (state == BluetoothHeadset.STATE_CONNECTED) {
+          scoConnectionAttempts = 0;
+          updateAudioDeviceState();
+        } else if (state == BluetoothHeadset.STATE_CONNECTING) {
+          // No action needed.
+        } else if (state == BluetoothHeadset.STATE_DISCONNECTING) {
+          // No action needed.
+        } else if (state == BluetoothHeadset.STATE_DISCONNECTED) {
+          // Bluetooth is probably powered off during the call.
+          stopScoAudio();
+          updateAudioDeviceState();
+        }
+        // Change in the audio (SCO) connection state of the Headset profile.
+        // Typically received after call to startScoAudio() has finalized.
+      } else if (action.equals(BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED)) {
+        final int state = intent.getIntExtra(
+            BluetoothHeadset.EXTRA_STATE, BluetoothHeadset.STATE_AUDIO_DISCONNECTED);
+        Log.d(TAG, "BluetoothHeadsetBroadcastReceiver.onReceive: "
+                + "a=ACTION_AUDIO_STATE_CHANGED, "
+                + "s=" + stateToString(state) + ", "
+                + "sb=" + isInitialStickyBroadcast() + ", "
+                + "BT state: " + bluetoothState);
+        if (state == BluetoothHeadset.STATE_AUDIO_CONNECTED) {
+          cancelTimer();
+          if (bluetoothState == State.SCO_CONNECTING) {
+            Log.d(TAG, "+++ Bluetooth audio SCO is now connected");
+            bluetoothState = State.SCO_CONNECTED;
+            scoConnectionAttempts = 0;
+            updateAudioDeviceState();
+          } else {
+            Log.w(TAG, "Unexpected state BluetoothHeadset.STATE_AUDIO_CONNECTED");
+          }
+        } else if (state == BluetoothHeadset.STATE_AUDIO_CONNECTING) {
+          Log.d(TAG, "+++ Bluetooth audio SCO is now connecting...");
+        } else if (state == BluetoothHeadset.STATE_AUDIO_DISCONNECTED) {
+          Log.d(TAG, "+++ Bluetooth audio SCO is now disconnected");
+          if (isInitialStickyBroadcast()) {
+            Log.d(TAG, "Ignore STATE_AUDIO_DISCONNECTED initial sticky broadcast.");
+            return;
+          }
+          updateAudioDeviceState();
+        }
+      }
+      Log.d(TAG, "onReceive done: BT state=" + bluetoothState);
+    }
+  }
+
+  /** Construction. */
+  static AppRTCBluetoothManager create(Context context, AppRTCAudioManager audioManager) {
+    Log.d(TAG, "create" + AppRTCUtils.getThreadInfo());
+    return new AppRTCBluetoothManager(context, audioManager);
+  }
+
+  protected AppRTCBluetoothManager(Context context, AppRTCAudioManager audioManager) {
+    Log.d(TAG, "ctor");
+    ThreadUtils.checkIsOnMainThread();
+    apprtcContext = context;
+    apprtcAudioManager = audioManager;
+    this.audioManager = getAudioManager(context);
+    bluetoothState = State.UNINITIALIZED;
+    bluetoothServiceListener = new BluetoothServiceListener();
+    bluetoothHeadsetReceiver = new BluetoothHeadsetBroadcastReceiver();
+    handler = new Handler(Looper.getMainLooper());
+  }
+
+  /** Returns the internal state. */
+  public State getState() {
+    ThreadUtils.checkIsOnMainThread();
+    return bluetoothState;
+  }
+
+  /**
+   * Activates components required to detect Bluetooth devices and to enable
+   * BT SCO (audio is routed via BT SCO) for the headset profile. The end
+   * state will be HEADSET_UNAVAILABLE but a state machine has started which
+   * will start a state change sequence where the final outcome depends on
+   * if/when the BT headset is enabled.
+   * Example of state change sequence when start() is called while BT device
+   * is connected and enabled:
+   *   UNINITIALIZED --> HEADSET_UNAVAILABLE --> HEADSET_AVAILABLE -->
+   *   SCO_CONNECTING --> SCO_CONNECTED <==> audio is now routed via BT SCO.
+   * Note that the AppRTCAudioManager is also involved in driving this state
+   * change.
+   */
+  public void start() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "start");
+    if (!hasPermission(apprtcContext, android.Manifest.permission.BLUETOOTH)) {
+      Log.w(TAG, "Process (pid=" + Process.myPid() + ") lacks BLUETOOTH permission");
+      return;
+    }
+    if (bluetoothState != State.UNINITIALIZED) {
+      Log.w(TAG, "Invalid BT state");
+      return;
+    }
+    bluetoothHeadset = null;
+    bluetoothDevice = null;
+    scoConnectionAttempts = 0;
+    // Get a handle to the default local Bluetooth adapter.
+    bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+    if (bluetoothAdapter == null) {
+      Log.w(TAG, "Device does not support Bluetooth");
+      return;
+    }
+    // Ensure that the device supports use of BT SCO audio for off call use cases.
+    if (!audioManager.isBluetoothScoAvailableOffCall()) {
+      Log.e(TAG, "Bluetooth SCO audio is not available off call");
+      return;
+    }
+    logBluetoothAdapterInfo(bluetoothAdapter);
+    // Establish a connection to the HEADSET profile (includes both Bluetooth Headset and
+    // Hands-Free) proxy object and install a listener.
+    if (!getBluetoothProfileProxy(
+            apprtcContext, bluetoothServiceListener, BluetoothProfile.HEADSET)) {
+      Log.e(TAG, "BluetoothAdapter.getProfileProxy(HEADSET) failed");
+      return;
+    }
+    // Register receivers for BluetoothHeadset change notifications.
+    IntentFilter bluetoothHeadsetFilter = new IntentFilter();
+    // Register receiver for change in connection state of the Headset profile.
+    bluetoothHeadsetFilter.addAction(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED);
+    // Register receiver for change in audio connection state of the Headset profile.
+    bluetoothHeadsetFilter.addAction(BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED);
+    registerReceiver(bluetoothHeadsetReceiver, bluetoothHeadsetFilter);
+    Log.d(TAG, "HEADSET profile state: "
+            + stateToString(bluetoothAdapter.getProfileConnectionState(BluetoothProfile.HEADSET)));
+    Log.d(TAG, "Bluetooth proxy for headset profile has started");
+    bluetoothState = State.HEADSET_UNAVAILABLE;
+    Log.d(TAG, "start done: BT state=" + bluetoothState);
+  }
+
+  /** Stops and closes all components related to Bluetooth audio. */
+  public void stop() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "stop: BT state=" + bluetoothState);
+    if (bluetoothAdapter == null) {
+      return;
+    }
+    // Stop BT SCO connection with remote device if needed.
+    stopScoAudio();
+    // Close down remaining BT resources.
+    if (bluetoothState == State.UNINITIALIZED) {
+      return;
+    }
+    unregisterReceiver(bluetoothHeadsetReceiver);
+    cancelTimer();
+    if (bluetoothHeadset != null) {
+      bluetoothAdapter.closeProfileProxy(BluetoothProfile.HEADSET, bluetoothHeadset);
+      bluetoothHeadset = null;
+    }
+    bluetoothAdapter = null;
+    bluetoothDevice = null;
+    bluetoothState = State.UNINITIALIZED;
+    Log.d(TAG, "stop done: BT state=" + bluetoothState);
+  }
+
+  /**
+   * Starts Bluetooth SCO connection with remote device.
+   * Note that the phone application always has the priority on the usage of the SCO connection
+   * for telephony. If this method is called while the phone is in call it will be ignored.
+   * Similarly, if a call is received or sent while an application is using the SCO connection,
+   * the connection will be lost for the application and NOT returned automatically when the call
+   * ends. Also note that: up to and including API version JELLY_BEAN_MR1, this method initiates a
+   * virtual voice call to the Bluetooth headset. After API version JELLY_BEAN_MR2 only a raw SCO
+   * audio connection is established.
+   * TODO(henrika): should we add support for virtual voice call to BT headset also for JBMR2 and
+   * higher. It might be required to initiates a virtual voice call since many devices do not
+   * accept SCO audio without a "call".
+   */
+  public boolean startScoAudio() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "startSco: BT state=" + bluetoothState + ", "
+            + "attempts: " + scoConnectionAttempts + ", "
+            + "SCO is on: " + isScoOn());
+    if (scoConnectionAttempts >= MAX_SCO_CONNECTION_ATTEMPTS) {
+      Log.e(TAG, "BT SCO connection fails - no more attempts");
+      return false;
+    }
+    if (bluetoothState != State.HEADSET_AVAILABLE) {
+      Log.e(TAG, "BT SCO connection fails - no headset available");
+      return false;
+    }
+    // Start BT SCO channel and wait for ACTION_AUDIO_STATE_CHANGED.
+    Log.d(TAG, "Starting Bluetooth SCO and waits for ACTION_AUDIO_STATE_CHANGED...");
+    // The SCO connection establishment can take several seconds, hence we cannot rely on the
+    // connection to be available when the method returns but instead register to receive the
+    // intent ACTION_SCO_AUDIO_STATE_UPDATED and wait for the state to be SCO_AUDIO_STATE_CONNECTED.
+    bluetoothState = State.SCO_CONNECTING;
+    audioManager.startBluetoothSco();
+    audioManager.setBluetoothScoOn(true);
+    scoConnectionAttempts++;
+    startTimer();
+    Log.d(TAG, "startScoAudio done: BT state=" + bluetoothState + ", "
+            + "SCO is on: " + isScoOn());
+    return true;
+  }
+
+  /** Stops Bluetooth SCO connection with remote device. */
+  public void stopScoAudio() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "stopScoAudio: BT state=" + bluetoothState + ", "
+            + "SCO is on: " + isScoOn());
+    if (bluetoothState != State.SCO_CONNECTING && bluetoothState != State.SCO_CONNECTED) {
+      return;
+    }
+    cancelTimer();
+    audioManager.stopBluetoothSco();
+    audioManager.setBluetoothScoOn(false);
+    bluetoothState = State.SCO_DISCONNECTING;
+    Log.d(TAG, "stopScoAudio done: BT state=" + bluetoothState + ", "
+            + "SCO is on: " + isScoOn());
+  }
+
+  /**
+   * Use the BluetoothHeadset proxy object (controls the Bluetooth Headset
+   * Service via IPC) to update the list of connected devices for the HEADSET
+   * profile. The internal state will change to HEADSET_UNAVAILABLE or to
+   * HEADSET_AVAILABLE and `bluetoothDevice` will be mapped to the connected
+   * device if available.
+   */
+  public void updateDevice() {
+    if (bluetoothState == State.UNINITIALIZED || bluetoothHeadset == null) {
+      return;
+    }
+    Log.d(TAG, "updateDevice");
+    // Get connected devices for the headset profile. Returns the set of
+    // devices which are in state STATE_CONNECTED. The BluetoothDevice class
+    // is just a thin wrapper for a Bluetooth hardware address.
+    List<BluetoothDevice> devices = bluetoothHeadset.getConnectedDevices();
+    if (devices.isEmpty()) {
+      bluetoothDevice = null;
+      bluetoothState = State.HEADSET_UNAVAILABLE;
+      Log.d(TAG, "No connected bluetooth headset");
+    } else {
+      // Always use first device in list. Android only supports one device.
+      bluetoothDevice = devices.get(0);
+      bluetoothState = State.HEADSET_AVAILABLE;
+      Log.d(TAG, "Connected bluetooth headset: "
+              + "name=" + bluetoothDevice.getName() + ", "
+              + "state=" + stateToString(bluetoothHeadset.getConnectionState(bluetoothDevice))
+              + ", SCO audio=" + bluetoothHeadset.isAudioConnected(bluetoothDevice));
+    }
+    Log.d(TAG, "updateDevice done: BT state=" + bluetoothState);
+  }
+
+  /**
+   * Stubs for test mocks.
+   */
+  @Nullable
+  protected AudioManager getAudioManager(Context context) {
+    return (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
+  }
+
+  protected void registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
+    apprtcContext.registerReceiver(receiver, filter);
+  }
+
+  protected void unregisterReceiver(BroadcastReceiver receiver) {
+    apprtcContext.unregisterReceiver(receiver);
+  }
+
+  protected boolean getBluetoothProfileProxy(
+      Context context, BluetoothProfile.ServiceListener listener, int profile) {
+    return bluetoothAdapter.getProfileProxy(context, listener, profile);
+  }
+
+  protected boolean hasPermission(Context context, String permission) {
+    return apprtcContext.checkPermission(permission, Process.myPid(), Process.myUid())
+        == PackageManager.PERMISSION_GRANTED;
+  }
+
+  /** Logs the state of the local Bluetooth adapter. */
+  @SuppressLint("HardwareIds")
+  protected void logBluetoothAdapterInfo(BluetoothAdapter localAdapter) {
+    Log.d(TAG, "BluetoothAdapter: "
+            + "enabled=" + localAdapter.isEnabled() + ", "
+            + "state=" + stateToString(localAdapter.getState()) + ", "
+            + "name=" + localAdapter.getName() + ", "
+            + "address=" + localAdapter.getAddress());
+    // Log the set of BluetoothDevice objects that are bonded (paired) to the local adapter.
+    Set<BluetoothDevice> pairedDevices = localAdapter.getBondedDevices();
+    if (!pairedDevices.isEmpty()) {
+      Log.d(TAG, "paired devices:");
+      for (BluetoothDevice device : pairedDevices) {
+        Log.d(TAG, " name=" + device.getName() + ", address=" + device.getAddress());
+      }
+    }
+  }
+
+  /** Ensures that the audio manager updates its list of available audio devices. */
+  private void updateAudioDeviceState() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "updateAudioDeviceState");
+    apprtcAudioManager.updateAudioDeviceState();
+  }
+
+  /** Starts timer which times out after BLUETOOTH_SCO_TIMEOUT_MS milliseconds. */
+  private void startTimer() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "startTimer");
+    handler.postDelayed(bluetoothTimeoutRunnable, BLUETOOTH_SCO_TIMEOUT_MS);
+  }
+
+  /** Cancels any outstanding timer tasks. */
+  private void cancelTimer() {
+    ThreadUtils.checkIsOnMainThread();
+    Log.d(TAG, "cancelTimer");
+    handler.removeCallbacks(bluetoothTimeoutRunnable);
+  }
+
+  /**
+   * Called when start of the BT SCO channel takes too long time. Usually
+   * happens when the BT device has been turned on during an ongoing call.
+   */
+  private void bluetoothTimeout() {
+    ThreadUtils.checkIsOnMainThread();
+    if (bluetoothState == State.UNINITIALIZED || bluetoothHeadset == null) {
+      return;
+    }
+    Log.d(TAG, "bluetoothTimeout: BT state=" + bluetoothState + ", "
+            + "attempts: " + scoConnectionAttempts + ", "
+            + "SCO is on: " + isScoOn());
+    if (bluetoothState != State.SCO_CONNECTING) {
+      return;
+    }
+    // Bluetooth SCO should be connecting; check the latest result.
+    boolean scoConnected = false;
+    List<BluetoothDevice> devices = bluetoothHeadset.getConnectedDevices();
+    if (devices.size() > 0) {
+      bluetoothDevice = devices.get(0);
+      if (bluetoothHeadset.isAudioConnected(bluetoothDevice)) {
+        Log.d(TAG, "SCO connected with " + bluetoothDevice.getName());
+        scoConnected = true;
+      } else {
+        Log.d(TAG, "SCO is not connected with " + bluetoothDevice.getName());
+      }
+    }
+    if (scoConnected) {
+      // We thought BT had timed out, but it's actually on; updating state.
+      bluetoothState = State.SCO_CONNECTED;
+      scoConnectionAttempts = 0;
+    } else {
+      // Give up and "cancel" our request by calling stopBluetoothSco().
+      Log.w(TAG, "BT failed to connect after timeout");
+      stopScoAudio();
+    }
+    updateAudioDeviceState();
+    Log.d(TAG, "bluetoothTimeout done: BT state=" + bluetoothState);
+  }
+
+  /** Checks whether audio uses Bluetooth SCO. */
+  private boolean isScoOn() {
+    return audioManager.isBluetoothScoOn();
+  }
+
+  /** Converts BluetoothAdapter states into local string representations. */
+  private String stateToString(int state) {
+    switch (state) {
+      case BluetoothAdapter.STATE_DISCONNECTED:
+        return "DISCONNECTED";
+      case BluetoothAdapter.STATE_CONNECTED:
+        return "CONNECTED";
+      case BluetoothAdapter.STATE_CONNECTING:
+        return "CONNECTING";
+      case BluetoothAdapter.STATE_DISCONNECTING:
+        return "DISCONNECTING";
+      case BluetoothAdapter.STATE_OFF:
+        return "OFF";
+      case BluetoothAdapter.STATE_ON:
+        return "ON";
+      case BluetoothAdapter.STATE_TURNING_OFF:
+        // Indicates the local Bluetooth adapter is turning off. Local clients should immediately
+        // attempt graceful disconnection of any remote links.
+        return "TURNING_OFF";
+      case BluetoothAdapter.STATE_TURNING_ON:
+        // Indicates the local Bluetooth adapter is turning on. However local clients should wait
+        // for STATE_ON before attempting to use the adapter.
+        return  "TURNING_ON";
+      default:
+        return "INVALID";
+    }
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java
new file mode 100644
index 0000000000..d5b7b4338e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java
@@ -0,0 +1,137 @@
+/*
+ *  Copyright 2013 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import org.webrtc.IceCandidate;
+import org.webrtc.PeerConnection;
+import org.webrtc.SessionDescription;
+
+import java.util.List;
+
+/**
+ * AppRTCClient is the interface representing an AppRTC client.
+ */
+public interface AppRTCClient {
+  /**
+   * Struct holding the connection parameters of an AppRTC room.
+   */
+  class RoomConnectionParameters {
+    public final String roomUrl;
+    public final String roomId;
+    public final boolean loopback;
+    public final String urlParameters;
+    public RoomConnectionParameters(
+        String roomUrl, String roomId, boolean loopback, String urlParameters) {
+      this.roomUrl = roomUrl;
+      this.roomId = roomId;
+      this.loopback = loopback;
+      this.urlParameters = urlParameters;
+    }
+    public RoomConnectionParameters(String roomUrl, String roomId, boolean loopback) {
+      this(roomUrl, roomId, loopback, null /* urlParameters */);
+    }
+  }
+
+  /**
+   * Asynchronously connect to an AppRTC room URL using supplied connection
+   * parameters. Once connection is established onConnectedToRoom()
+   * callback with room parameters is invoked.
+   */
+  void connectToRoom(RoomConnectionParameters connectionParameters);
+
+  /**
+   * Send offer SDP to the other participant.
+   */
+  void sendOfferSdp(final SessionDescription sdp);
+
+  /**
+   * Send answer SDP to the other participant.
+   */
+  void sendAnswerSdp(final SessionDescription sdp);
+
+  /**
+   * Send Ice candidate to the other participant.
+   */
+  void sendLocalIceCandidate(final IceCandidate candidate);
+
+  /**
+   * Send removed ICE candidates to the other participant.
+   */
+  void sendLocalIceCandidateRemovals(final IceCandidate[] candidates);
+
+  /**
+   * Disconnect from room.
+   */
+  void disconnectFromRoom();
+
+  /**
+   * Struct holding the signaling parameters of an AppRTC room.
+   */
+  class SignalingParameters {
+    public final List<PeerConnection.IceServer> iceServers;
+    public final boolean initiator;
+    public final String clientId;
+    public final String wssUrl;
+    public final String wssPostUrl;
+    public final SessionDescription offerSdp;
+    public final List<IceCandidate> iceCandidates;
+
+    public SignalingParameters(List<PeerConnection.IceServer> iceServers, boolean initiator,
+        String clientId, String wssUrl, String wssPostUrl, SessionDescription offerSdp,
+        List<IceCandidate> iceCandidates) {
+      this.iceServers = iceServers;
+      this.initiator = initiator;
+      this.clientId = clientId;
+      this.wssUrl = wssUrl;
+      this.wssPostUrl = wssPostUrl;
+      this.offerSdp = offerSdp;
+      this.iceCandidates = iceCandidates;
+    }
+  }
+
+  /**
+   * Callback interface for messages delivered on signaling channel.
+   *
+   * <p>Methods are guaranteed to be invoked on the UI thread of `activity`.
+   */
+  interface SignalingEvents {
+    /**
+     * Callback fired once the room's signaling parameters
+     * SignalingParameters are extracted.
+     */
+    void onConnectedToRoom(final SignalingParameters params);
+
+    /**
+     * Callback fired once remote SDP is received.
+     */
+    void onRemoteDescription(final SessionDescription sdp);
+
+    /**
+     * Callback fired once remote Ice candidate is received.
+     */
+    void onRemoteIceCandidate(final IceCandidate candidate);
+
+    /**
+     * Callback fired once remote Ice candidate removals are received.
+     */
+    void onRemoteIceCandidatesRemoved(final IceCandidate[] candidates);
+
+    /**
+     * Callback fired once channel is closed.
+     */
+    void onChannelClose();
+
+    /**
+     * Callback fired once channel error happened.
+     */
+    void onChannelError(final String description);
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCProximitySensor.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCProximitySensor.java
new file mode 100644
index 0000000000..604e2863d9
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCProximitySensor.java
@@ -0,0 +1,158 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.content.Context;
+import android.hardware.Sensor;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+import android.hardware.SensorManager;
+import android.os.Build;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import org.appspot.apprtc.util.AppRTCUtils;
+import org.webrtc.ThreadUtils;
+
+/**
+ * AppRTCProximitySensor manages functions related to the proximity sensor in
+ * the AppRTC demo.
+ * On most device, the proximity sensor is implemented as a boolean-sensor.
+ * It returns just two values "NEAR" or "FAR". Thresholding is done on the LUX
+ * value i.e. the LUX value of the light sensor is compared with a threshold.
+ * A LUX-value more than the threshold means the proximity sensor returns "FAR".
+ * Anything less than the threshold value and the sensor  returns "NEAR".
+ */
+public class AppRTCProximitySensor implements SensorEventListener {
+  private static final String TAG = "AppRTCProximitySensor";
+
+  // This class should be created, started and stopped on one thread
+  // (e.g. the main thread). We use `nonThreadSafe` to ensure that this is
+  // the case. Only active when `DEBUG` is set to true.
+  private final ThreadUtils.ThreadChecker threadChecker = new ThreadUtils.ThreadChecker();
+
+  private final Runnable onSensorStateListener;
+  private final SensorManager sensorManager;
+  @Nullable private Sensor proximitySensor;
+  private boolean lastStateReportIsNear;
+
+  /** Construction */
+  static AppRTCProximitySensor create(Context context, Runnable sensorStateListener) {
+    return new AppRTCProximitySensor(context, sensorStateListener);
+  }
+
+  private AppRTCProximitySensor(Context context, Runnable sensorStateListener) {
+    Log.d(TAG, "AppRTCProximitySensor" + AppRTCUtils.getThreadInfo());
+    onSensorStateListener = sensorStateListener;
+    sensorManager = ((SensorManager) context.getSystemService(Context.SENSOR_SERVICE));
+  }
+
+  /**
+   * Activate the proximity sensor. Also do initialization if called for the
+   * first time.
+   */
+  public boolean start() {
+    threadChecker.checkIsOnValidThread();
+    Log.d(TAG, "start" + AppRTCUtils.getThreadInfo());
+    if (!initDefaultSensor()) {
+      // Proximity sensor is not supported on this device.
+      return false;
+    }
+    sensorManager.registerListener(this, proximitySensor, SensorManager.SENSOR_DELAY_NORMAL);
+    return true;
+  }
+
+  /** Deactivate the proximity sensor. */
+  public void stop() {
+    threadChecker.checkIsOnValidThread();
+    Log.d(TAG, "stop" + AppRTCUtils.getThreadInfo());
+    if (proximitySensor == null) {
+      return;
+    }
+    sensorManager.unregisterListener(this, proximitySensor);
+  }
+
+  /** Getter for last reported state. Set to true if "near" is reported. */
+  public boolean sensorReportsNearState() {
+    threadChecker.checkIsOnValidThread();
+    return lastStateReportIsNear;
+  }
+
+  @Override
+  public final void onAccuracyChanged(Sensor sensor, int accuracy) {
+    threadChecker.checkIsOnValidThread();
+    AppRTCUtils.assertIsTrue(sensor.getType() == Sensor.TYPE_PROXIMITY);
+    if (accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE) {
+      Log.e(TAG, "The values returned by this sensor cannot be trusted");
+    }
+  }
+
+  @Override
+  public final void onSensorChanged(SensorEvent event) {
+    threadChecker.checkIsOnValidThread();
+    AppRTCUtils.assertIsTrue(event.sensor.getType() == Sensor.TYPE_PROXIMITY);
+    // As a best practice; do as little as possible within this method and
+    // avoid blocking.
+    float distanceInCentimeters = event.values[0];
+    if (distanceInCentimeters < proximitySensor.getMaximumRange()) {
+      Log.d(TAG, "Proximity sensor => NEAR state");
+      lastStateReportIsNear = true;
+    } else {
+      Log.d(TAG, "Proximity sensor => FAR state");
+      lastStateReportIsNear = false;
+    }
+
+    // Report about new state to listening client. Client can then call
+    // sensorReportsNearState() to query the current state (NEAR or FAR).
+    if (onSensorStateListener != null) {
+      onSensorStateListener.run();
+    }
+
+    Log.d(TAG, "onSensorChanged" + AppRTCUtils.getThreadInfo() + ": "
+            + "accuracy=" + event.accuracy + ", timestamp=" + event.timestamp + ", distance="
+            + event.values[0]);
+  }
+
+  /**
+   * Get default proximity sensor if it exists. Tablet devices (e.g. Nexus 7)
+   * does not support this type of sensor and false will be returned in such
+   * cases.
+   */
+  private boolean initDefaultSensor() {
+    if (proximitySensor != null) {
+      return true;
+    }
+    proximitySensor = sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
+    if (proximitySensor == null) {
+      return false;
+    }
+    logProximitySensorInfo();
+    return true;
+  }
+
+  /** Helper method for logging information about the proximity sensor. */
+  private void logProximitySensorInfo() {
+    if (proximitySensor == null) {
+      return;
+    }
+    StringBuilder info = new StringBuilder("Proximity sensor: ");
+    info.append("name=").append(proximitySensor.getName());
+    info.append(", vendor: ").append(proximitySensor.getVendor());
+    info.append(", power: ").append(proximitySensor.getPower());
+    info.append(", resolution: ").append(proximitySensor.getResolution());
+    info.append(", max range: ").append(proximitySensor.getMaximumRange());
+    info.append(", min delay: ").append(proximitySensor.getMinDelay());
+    info.append(", type: ").append(proximitySensor.getStringType());
+    info.append(", max delay: ").append(proximitySensor.getMaxDelay());
+    info.append(", reporting mode: ").append(proximitySensor.getReportingMode());
+    info.append(", isWakeUpSensor: ").append(proximitySensor.isWakeUpSensor());
+    Log.d(TAG, info.toString());
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java
new file mode 100644
index 0000000000..eb5ee8289e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java
@@ -0,0 +1,962 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.annotation.TargetApi;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.FragmentTransaction;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.media.projection.MediaProjection;
+import android.media.projection.MediaProjectionManager;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Handler;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
+import android.view.WindowManager.LayoutParams;
+import android.widget.Toast;
+import androidx.annotation.Nullable;
+import java.io.IOException;
+import java.lang.RuntimeException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import org.appspot.apprtc.AppRTCAudioManager.AudioDevice;
+import org.appspot.apprtc.AppRTCAudioManager.AudioManagerEvents;
+import org.appspot.apprtc.AppRTCClient.RoomConnectionParameters;
+import org.appspot.apprtc.AppRTCClient.SignalingParameters;
+import org.appspot.apprtc.PeerConnectionClient.DataChannelParameters;
+import org.appspot.apprtc.PeerConnectionClient.PeerConnectionParameters;
+import org.webrtc.Camera1Enumerator;
+import org.webrtc.Camera2Enumerator;
+import org.webrtc.CameraEnumerator;
+import org.webrtc.EglBase;
+import org.webrtc.FileVideoCapturer;
+import org.webrtc.IceCandidate;
+import org.webrtc.Logging;
+import org.webrtc.PeerConnectionFactory;
+import org.webrtc.RTCStatsReport;
+import org.webrtc.RendererCommon.ScalingType;
+import org.webrtc.ScreenCapturerAndroid;
+import org.webrtc.SessionDescription;
+import org.webrtc.SurfaceViewRenderer;
+import org.webrtc.VideoCapturer;
+import org.webrtc.VideoFileRenderer;
+import org.webrtc.VideoFrame;
+import org.webrtc.VideoSink;
+
+/**
+ * Activity for peer connection call setup, call waiting
+ * and call view.
+ */
+public class CallActivity extends Activity implements AppRTCClient.SignalingEvents,
+                                                      PeerConnectionClient.PeerConnectionEvents,
+                                                      CallFragment.OnCallEvents {
+  private static final String TAG = "CallRTCClient";
+
+  public static final String EXTRA_ROOMID = "org.appspot.apprtc.ROOMID";
+  public static final String EXTRA_URLPARAMETERS = "org.appspot.apprtc.URLPARAMETERS";
+  public static final String EXTRA_LOOPBACK = "org.appspot.apprtc.LOOPBACK";
+  public static final String EXTRA_VIDEO_CALL = "org.appspot.apprtc.VIDEO_CALL";
+  public static final String EXTRA_SCREENCAPTURE = "org.appspot.apprtc.SCREENCAPTURE";
+  public static final String EXTRA_CAMERA2 = "org.appspot.apprtc.CAMERA2";
+  public static final String EXTRA_VIDEO_WIDTH = "org.appspot.apprtc.VIDEO_WIDTH";
+  public static final String EXTRA_VIDEO_HEIGHT = "org.appspot.apprtc.VIDEO_HEIGHT";
+  public static final String EXTRA_VIDEO_FPS = "org.appspot.apprtc.VIDEO_FPS";
+  public static final String EXTRA_VIDEO_CAPTUREQUALITYSLIDER_ENABLED =
+      "org.appsopt.apprtc.VIDEO_CAPTUREQUALITYSLIDER";
+  public static final String EXTRA_VIDEO_BITRATE = "org.appspot.apprtc.VIDEO_BITRATE";
+  public static final String EXTRA_VIDEOCODEC = "org.appspot.apprtc.VIDEOCODEC";
+  public static final String EXTRA_HWCODEC_ENABLED = "org.appspot.apprtc.HWCODEC";
+  public static final String EXTRA_CAPTURETOTEXTURE_ENABLED = "org.appspot.apprtc.CAPTURETOTEXTURE";
+  public static final String EXTRA_FLEXFEC_ENABLED = "org.appspot.apprtc.FLEXFEC";
+  public static final String EXTRA_AUDIO_BITRATE = "org.appspot.apprtc.AUDIO_BITRATE";
+  public static final String EXTRA_AUDIOCODEC = "org.appspot.apprtc.AUDIOCODEC";
+  public static final String EXTRA_NOAUDIOPROCESSING_ENABLED =
+      "org.appspot.apprtc.NOAUDIOPROCESSING";
+  public static final String EXTRA_AECDUMP_ENABLED = "org.appspot.apprtc.AECDUMP";
+  public static final String EXTRA_SAVE_INPUT_AUDIO_TO_FILE_ENABLED =
+      "org.appspot.apprtc.SAVE_INPUT_AUDIO_TO_FILE";
+  public static final String EXTRA_OPENSLES_ENABLED = "org.appspot.apprtc.OPENSLES";
+  public static final String EXTRA_DISABLE_BUILT_IN_AEC = "org.appspot.apprtc.DISABLE_BUILT_IN_AEC";
+  public static final String EXTRA_DISABLE_BUILT_IN_AGC = "org.appspot.apprtc.DISABLE_BUILT_IN_AGC";
+  public static final String EXTRA_DISABLE_BUILT_IN_NS = "org.appspot.apprtc.DISABLE_BUILT_IN_NS";
+  public static final String EXTRA_DISABLE_WEBRTC_AGC_AND_HPF =
+      "org.appspot.apprtc.DISABLE_WEBRTC_GAIN_CONTROL";
+  public static final String EXTRA_DISPLAY_HUD = "org.appspot.apprtc.DISPLAY_HUD";
+  public static final String EXTRA_TRACING = "org.appspot.apprtc.TRACING";
+  public static final String EXTRA_CMDLINE = "org.appspot.apprtc.CMDLINE";
+  public static final String EXTRA_RUNTIME = "org.appspot.apprtc.RUNTIME";
+  public static final String EXTRA_VIDEO_FILE_AS_CAMERA = "org.appspot.apprtc.VIDEO_FILE_AS_CAMERA";
+  public static final String EXTRA_SAVE_REMOTE_VIDEO_TO_FILE =
+      "org.appspot.apprtc.SAVE_REMOTE_VIDEO_TO_FILE";
+  public static final String EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_WIDTH =
+      "org.appspot.apprtc.SAVE_REMOTE_VIDEO_TO_FILE_WIDTH";
+  public static final String EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_HEIGHT =
+      "org.appspot.apprtc.SAVE_REMOTE_VIDEO_TO_FILE_HEIGHT";
+  public static final String EXTRA_USE_VALUES_FROM_INTENT =
+      "org.appspot.apprtc.USE_VALUES_FROM_INTENT";
+  public static final String EXTRA_DATA_CHANNEL_ENABLED = "org.appspot.apprtc.DATA_CHANNEL_ENABLED";
+  public static final String EXTRA_ORDERED = "org.appspot.apprtc.ORDERED";
+  public static final String EXTRA_MAX_RETRANSMITS_MS = "org.appspot.apprtc.MAX_RETRANSMITS_MS";
+  public static final String EXTRA_MAX_RETRANSMITS = "org.appspot.apprtc.MAX_RETRANSMITS";
+  public static final String EXTRA_PROTOCOL = "org.appspot.apprtc.PROTOCOL";
+  public static final String EXTRA_NEGOTIATED = "org.appspot.apprtc.NEGOTIATED";
+  public static final String EXTRA_ID = "org.appspot.apprtc.ID";
+  public static final String EXTRA_ENABLE_RTCEVENTLOG = "org.appspot.apprtc.ENABLE_RTCEVENTLOG";
+
+  private static final int CAPTURE_PERMISSION_REQUEST_CODE = 1;
+
+  // List of mandatory application permissions.
+  private static final String[] MANDATORY_PERMISSIONS = {"android.permission.MODIFY_AUDIO_SETTINGS",
+      "android.permission.RECORD_AUDIO", "android.permission.INTERNET"};
+
+  // Peer connection statistics callback period in ms.
+  private static final int STAT_CALLBACK_PERIOD = 1000;
+
+  private static class ProxyVideoSink implements VideoSink {
+    private VideoSink target;
+
+    @Override
+    synchronized public void onFrame(VideoFrame frame) {
+      if (target == null) {
+        Logging.d(TAG, "Dropping frame in proxy because target is null.");
+        return;
+      }
+
+      target.onFrame(frame);
+    }
+
+    synchronized public void setTarget(VideoSink target) {
+      this.target = target;
+    }
+  }
+
+  private final ProxyVideoSink remoteProxyRenderer = new ProxyVideoSink();
+  private final ProxyVideoSink localProxyVideoSink = new ProxyVideoSink();
+  @Nullable private PeerConnectionClient peerConnectionClient;
+  @Nullable
+  private AppRTCClient appRtcClient;
+  @Nullable
+  private SignalingParameters signalingParameters;
+  @Nullable private AppRTCAudioManager audioManager;
+  @Nullable
+  private SurfaceViewRenderer pipRenderer;
+  @Nullable
+  private SurfaceViewRenderer fullscreenRenderer;
+  @Nullable
+  private VideoFileRenderer videoFileRenderer;
+  private final List<VideoSink> remoteSinks = new ArrayList<>();
+  private Toast logToast;
+  private boolean commandLineRun;
+  private boolean activityRunning;
+  private RoomConnectionParameters roomConnectionParameters;
+  @Nullable
+  private PeerConnectionParameters peerConnectionParameters;
+  private boolean connected;
+  private boolean isError;
+  private boolean callControlFragmentVisible = true;
+  private long callStartedTimeMs;
+  private boolean micEnabled = true;
+  private boolean screencaptureEnabled;
+  private static Intent mediaProjectionPermissionResultData;
+  private static int mediaProjectionPermissionResultCode;
+  // True if local view is in the fullscreen renderer.
+  private boolean isSwappedFeeds;
+
+  // Controls
+  private CallFragment callFragment;
+  private HudFragment hudFragment;
+  private CpuMonitor cpuMonitor;
+
+  @Override
+  // TODO(bugs.webrtc.org/8580): LayoutParams.FLAG_TURN_SCREEN_ON and
+  // LayoutParams.FLAG_SHOW_WHEN_LOCKED are deprecated.
+  @SuppressWarnings("deprecation")
+  public void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    Thread.setDefaultUncaughtExceptionHandler(new UnhandledExceptionHandler(this));
+
+    // Set window styles for fullscreen-window size. Needs to be done before
+    // adding content.
+    requestWindowFeature(Window.FEATURE_NO_TITLE);
+    getWindow().addFlags(LayoutParams.FLAG_FULLSCREEN | LayoutParams.FLAG_KEEP_SCREEN_ON
+        | LayoutParams.FLAG_SHOW_WHEN_LOCKED | LayoutParams.FLAG_TURN_SCREEN_ON);
+    getWindow().getDecorView().setSystemUiVisibility(getSystemUiVisibility());
+    setContentView(R.layout.activity_call);
+
+    connected = false;
+    signalingParameters = null;
+
+    // Create UI controls.
+    pipRenderer = findViewById(R.id.pip_video_view);
+    fullscreenRenderer = findViewById(R.id.fullscreen_video_view);
+    callFragment = new CallFragment();
+    hudFragment = new HudFragment();
+
+    // Show/hide call control fragment on view click.
+    View.OnClickListener listener = new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        toggleCallControlFragmentVisibility();
+      }
+    };
+
+    // Swap feeds on pip view click.
+    pipRenderer.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        setSwappedFeeds(!isSwappedFeeds);
+      }
+    });
+
+    fullscreenRenderer.setOnClickListener(listener);
+    remoteSinks.add(remoteProxyRenderer);
+
+    final Intent intent = getIntent();
+    final EglBase eglBase = EglBase.create();
+
+    // Create video renderers.
+    pipRenderer.init(eglBase.getEglBaseContext(), null);
+    pipRenderer.setScalingType(ScalingType.SCALE_ASPECT_FIT);
+    String saveRemoteVideoToFile = intent.getStringExtra(EXTRA_SAVE_REMOTE_VIDEO_TO_FILE);
+
+    // When saveRemoteVideoToFile is set we save the video from the remote to a file.
+    if (saveRemoteVideoToFile != null) {
+      int videoOutWidth = intent.getIntExtra(EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_WIDTH, 0);
+      int videoOutHeight = intent.getIntExtra(EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_HEIGHT, 0);
+      try {
+        videoFileRenderer = new VideoFileRenderer(
+            saveRemoteVideoToFile, videoOutWidth, videoOutHeight, eglBase.getEglBaseContext());
+        remoteSinks.add(videoFileRenderer);
+      } catch (IOException e) {
+        throw new RuntimeException(
+            "Failed to open video file for output: " + saveRemoteVideoToFile, e);
+      }
+    }
+    fullscreenRenderer.init(eglBase.getEglBaseContext(), null);
+    fullscreenRenderer.setScalingType(ScalingType.SCALE_ASPECT_FILL);
+
+    pipRenderer.setZOrderMediaOverlay(true);
+    pipRenderer.setEnableHardwareScaler(true /* enabled */);
+    fullscreenRenderer.setEnableHardwareScaler(false /* enabled */);
+    // Start with local feed in fullscreen and swap it to the pip when the call is connected.
+    setSwappedFeeds(true /* isSwappedFeeds */);
+
+    // Check for mandatory permissions.
+    for (String permission : MANDATORY_PERMISSIONS) {
+      if (checkCallingOrSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
+        logAndToast("Permission " + permission + " is not granted");
+        setResult(RESULT_CANCELED);
+        finish();
+        return;
+      }
+    }
+
+    Uri roomUri = intent.getData();
+    if (roomUri == null) {
+      logAndToast(getString(R.string.missing_url));
+      Log.e(TAG, "Didn't get any URL in intent!");
+      setResult(RESULT_CANCELED);
+      finish();
+      return;
+    }
+
+    // Get Intent parameters.
+    String roomId = intent.getStringExtra(EXTRA_ROOMID);
+    Log.d(TAG, "Room ID: " + roomId);
+    if (roomId == null || roomId.length() == 0) {
+      logAndToast(getString(R.string.missing_url));
+      Log.e(TAG, "Incorrect room ID in intent!");
+      setResult(RESULT_CANCELED);
+      finish();
+      return;
+    }
+
+    boolean loopback = intent.getBooleanExtra(EXTRA_LOOPBACK, false);
+    boolean tracing = intent.getBooleanExtra(EXTRA_TRACING, false);
+
+    int videoWidth = intent.getIntExtra(EXTRA_VIDEO_WIDTH, 0);
+    int videoHeight = intent.getIntExtra(EXTRA_VIDEO_HEIGHT, 0);
+
+    screencaptureEnabled = intent.getBooleanExtra(EXTRA_SCREENCAPTURE, false);
+    // If capturing format is not specified for screencapture, use screen resolution.
+    if (screencaptureEnabled && videoWidth == 0 && videoHeight == 0) {
+      DisplayMetrics displayMetrics = getDisplayMetrics();
+      videoWidth = displayMetrics.widthPixels;
+      videoHeight = displayMetrics.heightPixels;
+    }
+    DataChannelParameters dataChannelParameters = null;
+    if (intent.getBooleanExtra(EXTRA_DATA_CHANNEL_ENABLED, false)) {
+      dataChannelParameters = new DataChannelParameters(intent.getBooleanExtra(EXTRA_ORDERED, true),
+          intent.getIntExtra(EXTRA_MAX_RETRANSMITS_MS, -1),
+          intent.getIntExtra(EXTRA_MAX_RETRANSMITS, -1), intent.getStringExtra(EXTRA_PROTOCOL),
+          intent.getBooleanExtra(EXTRA_NEGOTIATED, false), intent.getIntExtra(EXTRA_ID, -1));
+    }
+    peerConnectionParameters =
+        new PeerConnectionParameters(intent.getBooleanExtra(EXTRA_VIDEO_CALL, true), loopback,
+            tracing, videoWidth, videoHeight, intent.getIntExtra(EXTRA_VIDEO_FPS, 0),
+            intent.getIntExtra(EXTRA_VIDEO_BITRATE, 0), intent.getStringExtra(EXTRA_VIDEOCODEC),
+            intent.getBooleanExtra(EXTRA_HWCODEC_ENABLED, true),
+            intent.getBooleanExtra(EXTRA_FLEXFEC_ENABLED, false),
+            intent.getIntExtra(EXTRA_AUDIO_BITRATE, 0), intent.getStringExtra(EXTRA_AUDIOCODEC),
+            intent.getBooleanExtra(EXTRA_NOAUDIOPROCESSING_ENABLED, false),
+            intent.getBooleanExtra(EXTRA_AECDUMP_ENABLED, false),
+            intent.getBooleanExtra(EXTRA_SAVE_INPUT_AUDIO_TO_FILE_ENABLED, false),
+            intent.getBooleanExtra(EXTRA_OPENSLES_ENABLED, false),
+            intent.getBooleanExtra(EXTRA_DISABLE_BUILT_IN_AEC, false),
+            intent.getBooleanExtra(EXTRA_DISABLE_BUILT_IN_AGC, false),
+            intent.getBooleanExtra(EXTRA_DISABLE_BUILT_IN_NS, false),
+            intent.getBooleanExtra(EXTRA_DISABLE_WEBRTC_AGC_AND_HPF, false),
+            intent.getBooleanExtra(EXTRA_ENABLE_RTCEVENTLOG, false), dataChannelParameters);
+    commandLineRun = intent.getBooleanExtra(EXTRA_CMDLINE, false);
+    int runTimeMs = intent.getIntExtra(EXTRA_RUNTIME, 0);
+
+    Log.d(TAG, "VIDEO_FILE: '" + intent.getStringExtra(EXTRA_VIDEO_FILE_AS_CAMERA) + "'");
+
+    // Create connection client. Use DirectRTCClient if room name is an IP otherwise use the
+    // standard WebSocketRTCClient.
+    if (loopback || !DirectRTCClient.IP_PATTERN.matcher(roomId).matches()) {
+      appRtcClient = new WebSocketRTCClient(this);
+    } else {
+      Log.i(TAG, "Using DirectRTCClient because room name looks like an IP.");
+      appRtcClient = new DirectRTCClient(this);
+    }
+    // Create connection parameters.
+    String urlParameters = intent.getStringExtra(EXTRA_URLPARAMETERS);
+    roomConnectionParameters =
+        new RoomConnectionParameters(roomUri.toString(), roomId, loopback, urlParameters);
+
+    // Create CPU monitor
+    if (CpuMonitor.isSupported()) {
+      cpuMonitor = new CpuMonitor(this);
+      hudFragment.setCpuMonitor(cpuMonitor);
+    }
+
+    // Send intent arguments to fragments.
+    callFragment.setArguments(intent.getExtras());
+    hudFragment.setArguments(intent.getExtras());
+    // Activate call and HUD fragments and start the call.
+    FragmentTransaction ft = getFragmentManager().beginTransaction();
+    ft.add(R.id.call_fragment_container, callFragment);
+    ft.add(R.id.hud_fragment_container, hudFragment);
+    ft.commit();
+
+    // For command line execution run connection for <runTimeMs> and exit.
+    if (commandLineRun && runTimeMs > 0) {
+      (new Handler()).postDelayed(new Runnable() {
+        @Override
+        public void run() {
+          disconnect();
+        }
+      }, runTimeMs);
+    }
+
+    // Create peer connection client.
+    peerConnectionClient = new PeerConnectionClient(
+        getApplicationContext(), eglBase, peerConnectionParameters, CallActivity.this);
+    PeerConnectionFactory.Options options = new PeerConnectionFactory.Options();
+    if (loopback) {
+      options.networkIgnoreMask = 0;
+    }
+    peerConnectionClient.createPeerConnectionFactory(options);
+
+    if (screencaptureEnabled) {
+      startScreenCapture();
+    } else {
+      startCall();
+    }
+  }
+
+  private DisplayMetrics getDisplayMetrics() {
+    DisplayMetrics displayMetrics = new DisplayMetrics();
+    WindowManager windowManager =
+        (WindowManager) getApplication().getSystemService(Context.WINDOW_SERVICE);
+    windowManager.getDefaultDisplay().getRealMetrics(displayMetrics);
+    return displayMetrics;
+  }
+
+  private static int getSystemUiVisibility() {
+    return View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN
+        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
+  }
+
+  private void startScreenCapture() {
+    MediaProjectionManager mediaProjectionManager =
+        (MediaProjectionManager) getApplication().getSystemService(
+            Context.MEDIA_PROJECTION_SERVICE);
+    startActivityForResult(
+        mediaProjectionManager.createScreenCaptureIntent(), CAPTURE_PERMISSION_REQUEST_CODE);
+  }
+
+  @Override
+  public void onActivityResult(int requestCode, int resultCode, Intent data) {
+    if (requestCode != CAPTURE_PERMISSION_REQUEST_CODE)
+      return;
+    mediaProjectionPermissionResultCode = resultCode;
+    mediaProjectionPermissionResultData = data;
+    startCall();
+  }
+
+  private boolean useCamera2() {
+    return Camera2Enumerator.isSupported(this) && getIntent().getBooleanExtra(EXTRA_CAMERA2, true);
+  }
+
+  private boolean captureToTexture() {
+    return getIntent().getBooleanExtra(EXTRA_CAPTURETOTEXTURE_ENABLED, false);
+  }
+
+  private @Nullable VideoCapturer createCameraCapturer(CameraEnumerator enumerator) {
+    final String[] deviceNames = enumerator.getDeviceNames();
+
+    // First, try to find front facing camera
+    Logging.d(TAG, "Looking for front facing cameras.");
+    for (String deviceName : deviceNames) {
+      if (enumerator.isFrontFacing(deviceName)) {
+        Logging.d(TAG, "Creating front facing camera capturer.");
+        VideoCapturer videoCapturer = enumerator.createCapturer(deviceName, null);
+
+        if (videoCapturer != null) {
+          return videoCapturer;
+        }
+      }
+    }
+
+    // Front facing camera not found, try something else
+    Logging.d(TAG, "Looking for other cameras.");
+    for (String deviceName : deviceNames) {
+      if (!enumerator.isFrontFacing(deviceName)) {
+        Logging.d(TAG, "Creating other camera capturer.");
+        VideoCapturer videoCapturer = enumerator.createCapturer(deviceName, null);
+
+        if (videoCapturer != null) {
+          return videoCapturer;
+        }
+      }
+    }
+
+    return null;
+  }
+
+  private @Nullable VideoCapturer createScreenCapturer() {
+    if (mediaProjectionPermissionResultCode != Activity.RESULT_OK) {
+      reportError("User didn't give permission to capture the screen.");
+      return null;
+    }
+    return new ScreenCapturerAndroid(
+        mediaProjectionPermissionResultData, new MediaProjection.Callback() {
+      @Override
+      public void onStop() {
+        reportError("User revoked permission to capture the screen.");
+      }
+    });
+  }
+
+  // Activity interfaces
+  @Override
+  public void onStop() {
+    super.onStop();
+    activityRunning = false;
+    // Don't stop the video when using screencapture to allow user to show other apps to the remote
+    // end.
+    if (peerConnectionClient != null && !screencaptureEnabled) {
+      peerConnectionClient.stopVideoSource();
+    }
+    if (cpuMonitor != null) {
+      cpuMonitor.pause();
+    }
+  }
+
+  @Override
+  public void onStart() {
+    super.onStart();
+    activityRunning = true;
+    // Video is not paused for screencapture. See onPause.
+    if (peerConnectionClient != null && !screencaptureEnabled) {
+      peerConnectionClient.startVideoSource();
+    }
+    if (cpuMonitor != null) {
+      cpuMonitor.resume();
+    }
+  }
+
+  @Override
+  protected void onDestroy() {
+    Thread.setDefaultUncaughtExceptionHandler(null);
+    disconnect();
+    if (logToast != null) {
+      logToast.cancel();
+    }
+    activityRunning = false;
+    super.onDestroy();
+  }
+
+  // CallFragment.OnCallEvents interface implementation.
+  @Override
+  public void onCallHangUp() {
+    disconnect();
+  }
+
+  @Override
+  public void onCameraSwitch() {
+    if (peerConnectionClient != null) {
+      peerConnectionClient.switchCamera();
+    }
+  }
+
+  @Override
+  public void onVideoScalingSwitch(ScalingType scalingType) {
+    fullscreenRenderer.setScalingType(scalingType);
+  }
+
+  @Override
+  public void onCaptureFormatChange(int width, int height, int framerate) {
+    if (peerConnectionClient != null) {
+      peerConnectionClient.changeCaptureFormat(width, height, framerate);
+    }
+  }
+
+  @Override
+  public boolean onToggleMic() {
+    if (peerConnectionClient != null) {
+      micEnabled = !micEnabled;
+      peerConnectionClient.setAudioEnabled(micEnabled);
+    }
+    return micEnabled;
+  }
+
+  // Helper functions.
+  private void toggleCallControlFragmentVisibility() {
+    if (!connected || !callFragment.isAdded()) {
+      return;
+    }
+    // Show/hide call control fragment
+    callControlFragmentVisible = !callControlFragmentVisible;
+    FragmentTransaction ft = getFragmentManager().beginTransaction();
+    if (callControlFragmentVisible) {
+      ft.show(callFragment);
+      ft.show(hudFragment);
+    } else {
+      ft.hide(callFragment);
+      ft.hide(hudFragment);
+    }
+    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
+    ft.commit();
+  }
+
+  private void startCall() {
+    if (appRtcClient == null) {
+      Log.e(TAG, "AppRTC client is not allocated for a call.");
+      return;
+    }
+    callStartedTimeMs = System.currentTimeMillis();
+
+    // Start room connection.
+    logAndToast(getString(R.string.connecting_to, roomConnectionParameters.roomUrl));
+    appRtcClient.connectToRoom(roomConnectionParameters);
+
+    // Create and audio manager that will take care of audio routing,
+    // audio modes, audio device enumeration etc.
+    audioManager = AppRTCAudioManager.create(getApplicationContext());
+    // Store existing audio settings and change audio mode to
+    // MODE_IN_COMMUNICATION for best possible VoIP performance.
+    Log.d(TAG, "Starting the audio manager...");
+    audioManager.start(new AudioManagerEvents() {
+      // This method will be called each time the number of available audio
+      // devices has changed.
+      @Override
+      public void onAudioDeviceChanged(
+          AudioDevice audioDevice, Set<AudioDevice> availableAudioDevices) {
+        onAudioManagerDevicesChanged(audioDevice, availableAudioDevices);
+      }
+    });
+  }
+
+  // Should be called from UI thread
+  private void callConnected() {
+    final long delta = System.currentTimeMillis() - callStartedTimeMs;
+    Log.i(TAG, "Call connected: delay=" + delta + "ms");
+    if (peerConnectionClient == null || isError) {
+      Log.w(TAG, "Call is connected in closed or error state");
+      return;
+    }
+    // Enable statistics callback.
+    peerConnectionClient.enableStatsEvents(true, STAT_CALLBACK_PERIOD);
+    setSwappedFeeds(false /* isSwappedFeeds */);
+  }
+
+  // This method is called when the audio manager reports audio device change,
+  // e.g. from wired headset to speakerphone.
+  private void onAudioManagerDevicesChanged(
+      final AudioDevice device, final Set<AudioDevice> availableDevices) {
+    Log.d(TAG, "onAudioManagerDevicesChanged: " + availableDevices + ", "
+            + "selected: " + device);
+    // TODO(henrika): add callback handler.
+  }
+
+  // Disconnect from remote resources, dispose of local resources, and exit.
+  private void disconnect() {
+    activityRunning = false;
+    remoteProxyRenderer.setTarget(null);
+    localProxyVideoSink.setTarget(null);
+    if (appRtcClient != null) {
+      appRtcClient.disconnectFromRoom();
+      appRtcClient = null;
+    }
+    if (pipRenderer != null) {
+      pipRenderer.release();
+      pipRenderer = null;
+    }
+    if (videoFileRenderer != null) {
+      videoFileRenderer.release();
+      videoFileRenderer = null;
+    }
+    if (fullscreenRenderer != null) {
+      fullscreenRenderer.release();
+      fullscreenRenderer = null;
+    }
+    if (peerConnectionClient != null) {
+      peerConnectionClient.close();
+      peerConnectionClient = null;
+    }
+    if (audioManager != null) {
+      audioManager.stop();
+      audioManager = null;
+    }
+    if (connected && !isError) {
+      setResult(RESULT_OK);
+    } else {
+      setResult(RESULT_CANCELED);
+    }
+    finish();
+  }
+
+  private void disconnectWithErrorMessage(final String errorMessage) {
+    if (commandLineRun || !activityRunning) {
+      Log.e(TAG, "Critical error: " + errorMessage);
+      disconnect();
+    } else {
+      new AlertDialog.Builder(this)
+          .setTitle(getText(R.string.channel_error_title))
+          .setMessage(errorMessage)
+          .setCancelable(false)
+          .setNeutralButton(R.string.ok,
+              new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int id) {
+                  dialog.cancel();
+                  disconnect();
+                }
+              })
+          .create()
+          .show();
+    }
+  }
+
+  // Log `msg` and Toast about it.
+  private void logAndToast(String msg) {
+    Log.d(TAG, msg);
+    if (logToast != null) {
+      logToast.cancel();
+    }
+    logToast = Toast.makeText(this, msg, Toast.LENGTH_SHORT);
+    logToast.show();
+  }
+
+  private void reportError(final String description) {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (!isError) {
+          isError = true;
+          disconnectWithErrorMessage(description);
+        }
+      }
+    });
+  }
+
+  private @Nullable VideoCapturer createVideoCapturer() {
+    final VideoCapturer videoCapturer;
+    String videoFileAsCamera = getIntent().getStringExtra(EXTRA_VIDEO_FILE_AS_CAMERA);
+    if (videoFileAsCamera != null) {
+      try {
+        videoCapturer = new FileVideoCapturer(videoFileAsCamera);
+      } catch (IOException e) {
+        reportError("Failed to open video file for emulated camera");
+        return null;
+      }
+    } else if (screencaptureEnabled) {
+      return createScreenCapturer();
+    } else if (useCamera2()) {
+      if (!captureToTexture()) {
+        reportError(getString(R.string.camera2_texture_only_error));
+        return null;
+      }
+
+      Logging.d(TAG, "Creating capturer using camera2 API.");
+      videoCapturer = createCameraCapturer(new Camera2Enumerator(this));
+    } else {
+      Logging.d(TAG, "Creating capturer using camera1 API.");
+      videoCapturer = createCameraCapturer(new Camera1Enumerator(captureToTexture()));
+    }
+    if (videoCapturer == null) {
+      reportError("Failed to open camera");
+      return null;
+    }
+    return videoCapturer;
+  }
+
+  private void setSwappedFeeds(boolean isSwappedFeeds) {
+    Logging.d(TAG, "setSwappedFeeds: " + isSwappedFeeds);
+    this.isSwappedFeeds = isSwappedFeeds;
+    localProxyVideoSink.setTarget(isSwappedFeeds ? fullscreenRenderer : pipRenderer);
+    remoteProxyRenderer.setTarget(isSwappedFeeds ? pipRenderer : fullscreenRenderer);
+    fullscreenRenderer.setMirror(isSwappedFeeds);
+    pipRenderer.setMirror(!isSwappedFeeds);
+  }
+
+  // -----Implementation of AppRTCClient.AppRTCSignalingEvents ---------------
+  // All callbacks are invoked from websocket signaling looper thread and
+  // are routed to UI thread.
+  private void onConnectedToRoomInternal(final SignalingParameters params) {
+    final long delta = System.currentTimeMillis() - callStartedTimeMs;
+
+    signalingParameters = params;
+    logAndToast("Creating peer connection, delay=" + delta + "ms");
+    VideoCapturer videoCapturer = null;
+    if (peerConnectionParameters.videoCallEnabled) {
+      videoCapturer = createVideoCapturer();
+    }
+    peerConnectionClient.createPeerConnection(
+        localProxyVideoSink, remoteSinks, videoCapturer, signalingParameters);
+
+    if (signalingParameters.initiator) {
+      logAndToast("Creating OFFER...");
+      // Create offer. Offer SDP will be sent to answering client in
+      // PeerConnectionEvents.onLocalDescription event.
+      peerConnectionClient.createOffer();
+    } else {
+      if (params.offerSdp != null) {
+        peerConnectionClient.setRemoteDescription(params.offerSdp);
+        logAndToast("Creating ANSWER...");
+        // Create answer. Answer SDP will be sent to offering client in
+        // PeerConnectionEvents.onLocalDescription event.
+        peerConnectionClient.createAnswer();
+      }
+      if (params.iceCandidates != null) {
+        // Add remote ICE candidates from room.
+        for (IceCandidate iceCandidate : params.iceCandidates) {
+          peerConnectionClient.addRemoteIceCandidate(iceCandidate);
+        }
+      }
+    }
+  }
+
+  @Override
+  public void onConnectedToRoom(final SignalingParameters params) {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        onConnectedToRoomInternal(params);
+      }
+    });
+  }
+
+  @Override
+  public void onRemoteDescription(final SessionDescription desc) {
+    final long delta = System.currentTimeMillis() - callStartedTimeMs;
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (peerConnectionClient == null) {
+          Log.e(TAG, "Received remote SDP for non-initilized peer connection.");
+          return;
+        }
+        logAndToast("Received remote " + desc.type + ", delay=" + delta + "ms");
+        peerConnectionClient.setRemoteDescription(desc);
+        if (!signalingParameters.initiator) {
+          logAndToast("Creating ANSWER...");
+          // Create answer. Answer SDP will be sent to offering client in
+          // PeerConnectionEvents.onLocalDescription event.
+          peerConnectionClient.createAnswer();
+        }
+      }
+    });
+  }
+
+  @Override
+  public void onRemoteIceCandidate(final IceCandidate candidate) {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (peerConnectionClient == null) {
+          Log.e(TAG, "Received ICE candidate for a non-initialized peer connection.");
+          return;
+        }
+        peerConnectionClient.addRemoteIceCandidate(candidate);
+      }
+    });
+  }
+
+  @Override
+  public void onRemoteIceCandidatesRemoved(final IceCandidate[] candidates) {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (peerConnectionClient == null) {
+          Log.e(TAG, "Received ICE candidate removals for a non-initialized peer connection.");
+          return;
+        }
+        peerConnectionClient.removeRemoteIceCandidates(candidates);
+      }
+    });
+  }
+
+  @Override
+  public void onChannelClose() {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        logAndToast("Remote end hung up; dropping PeerConnection");
+        disconnect();
+      }
+    });
+  }
+
+  @Override
+  public void onChannelError(final String description) {
+    reportError(description);
+  }
+
+  // -----Implementation of PeerConnectionClient.PeerConnectionEvents.---------
+  // Send local peer connection SDP and ICE candidates to remote party.
+  // All callbacks are invoked from peer connection client looper thread and
+  // are routed to UI thread.
+  @Override
+  public void onLocalDescription(final SessionDescription desc) {
+    final long delta = System.currentTimeMillis() - callStartedTimeMs;
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (appRtcClient != null) {
+          logAndToast("Sending " + desc.type + ", delay=" + delta + "ms");
+          if (signalingParameters.initiator) {
+            appRtcClient.sendOfferSdp(desc);
+          } else {
+            appRtcClient.sendAnswerSdp(desc);
+          }
+        }
+        if (peerConnectionParameters.videoMaxBitrate > 0) {
+          Log.d(TAG, "Set video maximum bitrate: " + peerConnectionParameters.videoMaxBitrate);
+          peerConnectionClient.setVideoMaxBitrate(peerConnectionParameters.videoMaxBitrate);
+        }
+      }
+    });
+  }
+
+  @Override
+  public void onIceCandidate(final IceCandidate candidate) {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (appRtcClient != null) {
+          appRtcClient.sendLocalIceCandidate(candidate);
+        }
+      }
+    });
+  }
+
+  @Override
+  public void onIceCandidatesRemoved(final IceCandidate[] candidates) {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (appRtcClient != null) {
+          appRtcClient.sendLocalIceCandidateRemovals(candidates);
+        }
+      }
+    });
+  }
+
+  @Override
+  public void onIceConnected() {
+    final long delta = System.currentTimeMillis() - callStartedTimeMs;
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        logAndToast("ICE connected, delay=" + delta + "ms");
+      }
+    });
+  }
+
+  @Override
+  public void onIceDisconnected() {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        logAndToast("ICE disconnected");
+      }
+    });
+  }
+
+  @Override
+  public void onConnected() {
+    final long delta = System.currentTimeMillis() - callStartedTimeMs;
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        logAndToast("DTLS connected, delay=" + delta + "ms");
+        connected = true;
+        callConnected();
+      }
+    });
+  }
+
+  @Override
+  public void onDisconnected() {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        logAndToast("DTLS disconnected");
+        connected = false;
+        disconnect();
+      }
+    });
+  }
+
+  @Override
+  public void onPeerConnectionClosed() {}
+
+  @Override
+  public void onPeerConnectionStatsReady(final RTCStatsReport report) {
+    runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        if (!isError && connected) {
+          hudFragment.updateEncoderStatistics(report);
+        }
+      }
+    });
+  }
+
+  @Override
+  public void onPeerConnectionError(final String description) {
+    reportError(description);
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java
new file mode 100644
index 0000000000..0d8bdaa06f
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java
@@ -0,0 +1,137 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.app.Activity;
+import android.app.Fragment;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.SeekBar;
+import android.widget.TextView;
+
+import org.webrtc.RendererCommon.ScalingType;
+
+/**
+ * Fragment for call control.
+ */
+public class CallFragment extends Fragment {
+  private TextView contactView;
+  private ImageButton cameraSwitchButton;
+  private ImageButton videoScalingButton;
+  private ImageButton toggleMuteButton;
+  private TextView captureFormatText;
+  private SeekBar captureFormatSlider;
+  private OnCallEvents callEvents;
+  private ScalingType scalingType;
+  private boolean videoCallEnabled = true;
+
+  /**
+   * Call control interface for container activity.
+   */
+  public interface OnCallEvents {
+    void onCallHangUp();
+    void onCameraSwitch();
+    void onVideoScalingSwitch(ScalingType scalingType);
+    void onCaptureFormatChange(int width, int height, int framerate);
+    boolean onToggleMic();
+  }
+
+  @Override
+  public View onCreateView(
+      LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    View controlView = inflater.inflate(R.layout.fragment_call, container, false);
+
+    // Create UI controls.
+    contactView = controlView.findViewById(R.id.contact_name_call);
+    ImageButton disconnectButton = controlView.findViewById(R.id.button_call_disconnect);
+    cameraSwitchButton = controlView.findViewById(R.id.button_call_switch_camera);
+    videoScalingButton = controlView.findViewById(R.id.button_call_scaling_mode);
+    toggleMuteButton = controlView.findViewById(R.id.button_call_toggle_mic);
+    captureFormatText = controlView.findViewById(R.id.capture_format_text_call);
+    captureFormatSlider = controlView.findViewById(R.id.capture_format_slider_call);
+
+    // Add buttons click events.
+    disconnectButton.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        callEvents.onCallHangUp();
+      }
+    });
+
+    cameraSwitchButton.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        callEvents.onCameraSwitch();
+      }
+    });
+
+    videoScalingButton.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        if (scalingType == ScalingType.SCALE_ASPECT_FILL) {
+          videoScalingButton.setBackgroundResource(R.drawable.ic_action_full_screen);
+          scalingType = ScalingType.SCALE_ASPECT_FIT;
+        } else {
+          videoScalingButton.setBackgroundResource(R.drawable.ic_action_return_from_full_screen);
+          scalingType = ScalingType.SCALE_ASPECT_FILL;
+        }
+        callEvents.onVideoScalingSwitch(scalingType);
+      }
+    });
+    scalingType = ScalingType.SCALE_ASPECT_FILL;
+
+    toggleMuteButton.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        boolean enabled = callEvents.onToggleMic();
+        toggleMuteButton.setAlpha(enabled ? 1.0f : 0.3f);
+      }
+    });
+
+    return controlView;
+  }
+
+  @Override
+  public void onStart() {
+    super.onStart();
+
+    boolean captureSliderEnabled = false;
+    Bundle args = getArguments();
+    if (args != null) {
+      String contactName = args.getString(CallActivity.EXTRA_ROOMID);
+      contactView.setText(contactName);
+      videoCallEnabled = args.getBoolean(CallActivity.EXTRA_VIDEO_CALL, true);
+      captureSliderEnabled = videoCallEnabled
+          && args.getBoolean(CallActivity.EXTRA_VIDEO_CAPTUREQUALITYSLIDER_ENABLED, false);
+    }
+    if (!videoCallEnabled) {
+      cameraSwitchButton.setVisibility(View.INVISIBLE);
+    }
+    if (captureSliderEnabled) {
+      captureFormatSlider.setOnSeekBarChangeListener(
+          new CaptureQualityController(captureFormatText, callEvents));
+    } else {
+      captureFormatText.setVisibility(View.GONE);
+      captureFormatSlider.setVisibility(View.GONE);
+    }
+  }
+
+  // TODO(sakal): Replace with onAttach(Context) once we only support API level 23+.
+  @SuppressWarnings("deprecation")
+  @Override
+  public void onAttach(Activity activity) {
+    super.onAttach(activity);
+    callEvents = (OnCallEvents) activity;
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CaptureQualityController.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CaptureQualityController.java
new file mode 100644
index 0000000000..8a783eca9c
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CaptureQualityController.java
@@ -0,0 +1,110 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.widget.SeekBar;
+import android.widget.TextView;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import org.webrtc.CameraEnumerationAndroid.CaptureFormat;
+
+/**
+ * Control capture format based on a seekbar listener.
+ */
+public class CaptureQualityController implements SeekBar.OnSeekBarChangeListener {
+  private final List<CaptureFormat> formats =
+      Arrays.asList(new CaptureFormat(1280, 720, 0, 30000), new CaptureFormat(960, 540, 0, 30000),
+          new CaptureFormat(640, 480, 0, 30000), new CaptureFormat(480, 360, 0, 30000),
+          new CaptureFormat(320, 240, 0, 30000), new CaptureFormat(256, 144, 0, 30000));
+  // Prioritize framerate below this threshold and resolution above the threshold.
+  private static final int FRAMERATE_THRESHOLD = 15;
+  private TextView captureFormatText;
+  private CallFragment.OnCallEvents callEvents;
+  private int width;
+  private int height;
+  private int framerate;
+  private double targetBandwidth;
+
+  public CaptureQualityController(
+      TextView captureFormatText, CallFragment.OnCallEvents callEvents) {
+    this.captureFormatText = captureFormatText;
+    this.callEvents = callEvents;
+  }
+
+  private final Comparator<CaptureFormat> compareFormats = new Comparator<CaptureFormat>() {
+    @Override
+    public int compare(CaptureFormat first, CaptureFormat second) {
+      int firstFps = calculateFramerate(targetBandwidth, first);
+      int secondFps = calculateFramerate(targetBandwidth, second);
+
+      if ((firstFps >= FRAMERATE_THRESHOLD && secondFps >= FRAMERATE_THRESHOLD)
+          || firstFps == secondFps) {
+        // Compare resolution.
+        return first.width * first.height - second.width * second.height;
+      } else {
+        // Compare fps.
+        return firstFps - secondFps;
+      }
+    }
+  };
+
+  @Override
+  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+    if (progress == 0) {
+      width = 0;
+      height = 0;
+      framerate = 0;
+      captureFormatText.setText(R.string.muted);
+      return;
+    }
+
+    // Extract max bandwidth (in millipixels / second).
+    long maxCaptureBandwidth = java.lang.Long.MIN_VALUE;
+    for (CaptureFormat format : formats) {
+      maxCaptureBandwidth =
+          Math.max(maxCaptureBandwidth, (long) format.width * format.height * format.framerate.max);
+    }
+
+    // Fraction between 0 and 1.
+    double bandwidthFraction = (double) progress / 100.0;
+    // Make a log-scale transformation, still between 0 and 1.
+    final double kExpConstant = 3.0;
+    bandwidthFraction =
+        (Math.exp(kExpConstant * bandwidthFraction) - 1) / (Math.exp(kExpConstant) - 1);
+    targetBandwidth = bandwidthFraction * maxCaptureBandwidth;
+
+    // Choose the best format given a target bandwidth.
+    final CaptureFormat bestFormat = Collections.max(formats, compareFormats);
+    width = bestFormat.width;
+    height = bestFormat.height;
+    framerate = calculateFramerate(targetBandwidth, bestFormat);
+    captureFormatText.setText(
+        String.format(captureFormatText.getContext().getString(R.string.format_description), width,
+            height, framerate));
+  }
+
+  @Override
+  public void onStartTrackingTouch(SeekBar seekBar) {}
+
+  @Override
+  public void onStopTrackingTouch(SeekBar seekBar) {
+    callEvents.onCaptureFormatChange(width, height, framerate);
+  }
+
+  // Return the highest frame rate possible based on bandwidth and format.
+  private int calculateFramerate(double bandwidth, CaptureFormat format) {
+    return (int) Math.round(
+        Math.min(format.framerate.max, (int) Math.round(bandwidth / (format.width * format.height)))
+        / 1000.0);
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/ConnectActivity.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/ConnectActivity.java
new file mode 100644
index 0000000000..7206c88498
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/ConnectActivity.java
@@ -0,0 +1,666 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.annotation.TargetApi;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.util.Log;
+import android.view.ContextMenu;
+import android.view.KeyEvent;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.inputmethod.EditorInfo;
+import android.webkit.URLUtil;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.ListView;
+import android.widget.TextView;
+import androidx.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.Random;
+import org.json.JSONArray;
+import org.json.JSONException;
+
+/**
+ * Handles the initial setup where the user selects which room to join.
+ */
+public class ConnectActivity extends Activity {
+  private static final String TAG = "ConnectActivity";
+  private static final int CONNECTION_REQUEST = 1;
+  private static final int PERMISSION_REQUEST = 2;
+  private static final int REMOVE_FAVORITE_INDEX = 0;
+  private static boolean commandLineRun;
+
+  private ImageButton addFavoriteButton;
+  private EditText roomEditText;
+  private ListView roomListView;
+  private SharedPreferences sharedPref;
+  private String keyprefResolution;
+  private String keyprefFps;
+  private String keyprefVideoBitrateType;
+  private String keyprefVideoBitrateValue;
+  private String keyprefAudioBitrateType;
+  private String keyprefAudioBitrateValue;
+  private String keyprefRoomServerUrl;
+  private String keyprefRoom;
+  private String keyprefRoomList;
+  private ArrayList<String> roomList;
+  private ArrayAdapter<String> adapter;
+
+  @Override
+  public void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+
+    // Get setting keys.
+    PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
+    sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
+    keyprefResolution = getString(R.string.pref_resolution_key);
+    keyprefFps = getString(R.string.pref_fps_key);
+    keyprefVideoBitrateType = getString(R.string.pref_maxvideobitrate_key);
+    keyprefVideoBitrateValue = getString(R.string.pref_maxvideobitratevalue_key);
+    keyprefAudioBitrateType = getString(R.string.pref_startaudiobitrate_key);
+    keyprefAudioBitrateValue = getString(R.string.pref_startaudiobitratevalue_key);
+    keyprefRoomServerUrl = getString(R.string.pref_room_server_url_key);
+    keyprefRoom = getString(R.string.pref_room_key);
+    keyprefRoomList = getString(R.string.pref_room_list_key);
+
+    setContentView(R.layout.activity_connect);
+
+    roomEditText = findViewById(R.id.room_edittext);
+    roomEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
+      @Override
+      public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) {
+        if (i == EditorInfo.IME_ACTION_DONE) {
+          addFavoriteButton.performClick();
+          return true;
+        }
+        return false;
+      }
+    });
+    roomEditText.requestFocus();
+
+    roomListView = findViewById(R.id.room_listview);
+    roomListView.setEmptyView(findViewById(android.R.id.empty));
+    roomListView.setOnItemClickListener(roomListClickListener);
+    registerForContextMenu(roomListView);
+    ImageButton connectButton = findViewById(R.id.connect_button);
+    connectButton.setOnClickListener(connectListener);
+    addFavoriteButton = findViewById(R.id.add_favorite_button);
+    addFavoriteButton.setOnClickListener(addFavoriteListener);
+
+    requestPermissions();
+  }
+
+  @Override
+  public boolean onCreateOptionsMenu(Menu menu) {
+    getMenuInflater().inflate(R.menu.connect_menu, menu);
+    return true;
+  }
+
+  @Override
+  public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
+    if (v.getId() == R.id.room_listview) {
+      AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
+      menu.setHeaderTitle(roomList.get(info.position));
+      String[] menuItems = getResources().getStringArray(R.array.roomListContextMenu);
+      for (int i = 0; i < menuItems.length; i++) {
+        menu.add(Menu.NONE, i, i, menuItems[i]);
+      }
+    } else {
+      super.onCreateContextMenu(menu, v, menuInfo);
+    }
+  }
+
+  @Override
+  public boolean onContextItemSelected(MenuItem item) {
+    if (item.getItemId() == REMOVE_FAVORITE_INDEX) {
+      AdapterView.AdapterContextMenuInfo info =
+          (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
+      roomList.remove(info.position);
+      adapter.notifyDataSetChanged();
+      return true;
+    }
+
+    return super.onContextItemSelected(item);
+  }
+
+  @Override
+  public boolean onOptionsItemSelected(MenuItem item) {
+    // Handle presses on the action bar items.
+    if (item.getItemId() == R.id.action_settings) {
+      Intent intent = new Intent(this, SettingsActivity.class);
+      startActivity(intent);
+      return true;
+    } else if (item.getItemId() == R.id.action_loopback) {
+      connectToRoom(null, false, true, false, 0);
+      return true;
+    } else {
+      return super.onOptionsItemSelected(item);
+    }
+  }
+
+  @Override
+  public void onPause() {
+    super.onPause();
+    String room = roomEditText.getText().toString();
+    String roomListJson = new JSONArray(roomList).toString();
+    SharedPreferences.Editor editor = sharedPref.edit();
+    editor.putString(keyprefRoom, room);
+    editor.putString(keyprefRoomList, roomListJson);
+    editor.commit();
+  }
+
+  @Override
+  public void onResume() {
+    super.onResume();
+    String room = sharedPref.getString(keyprefRoom, "");
+    roomEditText.setText(room);
+    roomList = new ArrayList<>();
+    String roomListJson = sharedPref.getString(keyprefRoomList, null);
+    if (roomListJson != null) {
+      try {
+        JSONArray jsonArray = new JSONArray(roomListJson);
+        for (int i = 0; i < jsonArray.length(); i++) {
+          roomList.add(jsonArray.get(i).toString());
+        }
+      } catch (JSONException e) {
+        Log.e(TAG, "Failed to load room list: " + e.toString());
+      }
+    }
+    adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, roomList);
+    roomListView.setAdapter(adapter);
+    if (adapter.getCount() > 0) {
+      roomListView.requestFocus();
+      roomListView.setItemChecked(0, true);
+    }
+  }
+
+  @Override
+  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+    if (requestCode == CONNECTION_REQUEST && commandLineRun) {
+      Log.d(TAG, "Return: " + resultCode);
+      setResult(resultCode);
+      commandLineRun = false;
+      finish();
+    }
+  }
+
+  @Override
+  public void onRequestPermissionsResult(
+      int requestCode, String[] permissions, int[] grantResults) {
+    if (requestCode == PERMISSION_REQUEST) {
+      String[] missingPermissions = getMissingPermissions();
+      if (missingPermissions.length != 0) {
+        // User didn't grant all the permissions. Warn that the application might not work
+        // correctly.
+        new AlertDialog.Builder(this)
+            .setMessage(R.string.missing_permissions_try_again)
+            .setPositiveButton(R.string.yes,
+                (dialog, id) -> {
+                  // User wants to try giving the permissions again.
+                  dialog.cancel();
+                  requestPermissions();
+                })
+            .setNegativeButton(R.string.no,
+                (dialog, id) -> {
+                  // User doesn't want to give the permissions.
+                  dialog.cancel();
+                  onPermissionsGranted();
+                })
+            .show();
+      } else {
+        // All permissions granted.
+        onPermissionsGranted();
+      }
+    }
+  }
+
+  private void onPermissionsGranted() {
+    // If an implicit VIEW intent is launching the app, go directly to that URL.
+    final Intent intent = getIntent();
+    if ("android.intent.action.VIEW".equals(intent.getAction()) && !commandLineRun) {
+      boolean loopback = intent.getBooleanExtra(CallActivity.EXTRA_LOOPBACK, false);
+      int runTimeMs = intent.getIntExtra(CallActivity.EXTRA_RUNTIME, 0);
+      boolean useValuesFromIntent =
+          intent.getBooleanExtra(CallActivity.EXTRA_USE_VALUES_FROM_INTENT, false);
+      String room = sharedPref.getString(keyprefRoom, "");
+      connectToRoom(room, true, loopback, useValuesFromIntent, runTimeMs);
+    }
+  }
+
+  @TargetApi(Build.VERSION_CODES.M)
+  private void requestPermissions() {
+    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
+      // Dynamic permissions are not required before Android M.
+      onPermissionsGranted();
+      return;
+    }
+
+    String[] missingPermissions = getMissingPermissions();
+    if (missingPermissions.length != 0) {
+      requestPermissions(missingPermissions, PERMISSION_REQUEST);
+    } else {
+      onPermissionsGranted();
+    }
+  }
+
+  @TargetApi(Build.VERSION_CODES.M)
+  private String[] getMissingPermissions() {
+    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
+      return new String[0];
+    }
+
+    PackageInfo info;
+    try {
+      info = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_PERMISSIONS);
+    } catch (PackageManager.NameNotFoundException e) {
+      Log.w(TAG, "Failed to retrieve permissions.");
+      return new String[0];
+    }
+
+    if (info.requestedPermissions == null) {
+      Log.w(TAG, "No requested permissions.");
+      return new String[0];
+    }
+
+    ArrayList<String> missingPermissions = new ArrayList<>();
+    for (int i = 0; i < info.requestedPermissions.length; i++) {
+      if ((info.requestedPermissionsFlags[i] & PackageInfo.REQUESTED_PERMISSION_GRANTED) == 0) {
+        missingPermissions.add(info.requestedPermissions[i]);
+      }
+    }
+    Log.d(TAG, "Missing permissions: " + missingPermissions);
+
+    return missingPermissions.toArray(new String[missingPermissions.size()]);
+  }
+
+  /**
+   * Get a value from the shared preference or from the intent, if it does not
+   * exist the default is used.
+   */
+  @Nullable
+  private String sharedPrefGetString(
+      int attributeId, String intentName, int defaultId, boolean useFromIntent) {
+    String defaultValue = getString(defaultId);
+    if (useFromIntent) {
+      String value = getIntent().getStringExtra(intentName);
+      if (value != null) {
+        return value;
+      }
+      return defaultValue;
+    } else {
+      String attributeName = getString(attributeId);
+      return sharedPref.getString(attributeName, defaultValue);
+    }
+  }
+
+  /**
+   * Get a value from the shared preference or from the intent, if it does not
+   * exist the default is used.
+   */
+  private boolean sharedPrefGetBoolean(
+      int attributeId, String intentName, int defaultId, boolean useFromIntent) {
+    boolean defaultValue = Boolean.parseBoolean(getString(defaultId));
+    if (useFromIntent) {
+      return getIntent().getBooleanExtra(intentName, defaultValue);
+    } else {
+      String attributeName = getString(attributeId);
+      return sharedPref.getBoolean(attributeName, defaultValue);
+    }
+  }
+
+  /**
+   * Get a value from the shared preference or from the intent, if it does not
+   * exist the default is used.
+   */
+  private int sharedPrefGetInteger(
+      int attributeId, String intentName, int defaultId, boolean useFromIntent) {
+    String defaultString = getString(defaultId);
+    int defaultValue = Integer.parseInt(defaultString);
+    if (useFromIntent) {
+      return getIntent().getIntExtra(intentName, defaultValue);
+    } else {
+      String attributeName = getString(attributeId);
+      String value = sharedPref.getString(attributeName, defaultString);
+      try {
+        return Integer.parseInt(value);
+      } catch (NumberFormatException e) {
+        Log.e(TAG, "Wrong setting for: " + attributeName + ":" + value);
+        return defaultValue;
+      }
+    }
+  }
+
+  @SuppressWarnings("StringSplitter")
+  private void connectToRoom(String roomId, boolean commandLineRun, boolean loopback,
+      boolean useValuesFromIntent, int runTimeMs) {
+    ConnectActivity.commandLineRun = commandLineRun;
+
+    // roomId is random for loopback.
+    if (loopback) {
+      roomId = Integer.toString((new Random()).nextInt(100000000));
+    }
+
+    String roomUrl = sharedPref.getString(
+        keyprefRoomServerUrl, getString(R.string.pref_room_server_url_default));
+
+    // Video call enabled flag.
+    boolean videoCallEnabled = sharedPrefGetBoolean(R.string.pref_videocall_key,
+        CallActivity.EXTRA_VIDEO_CALL, R.string.pref_videocall_default, useValuesFromIntent);
+
+    // Use screencapture option.
+    boolean useScreencapture = sharedPrefGetBoolean(R.string.pref_screencapture_key,
+        CallActivity.EXTRA_SCREENCAPTURE, R.string.pref_screencapture_default, useValuesFromIntent);
+
+    // Use Camera2 option.
+    boolean useCamera2 = sharedPrefGetBoolean(R.string.pref_camera2_key, CallActivity.EXTRA_CAMERA2,
+        R.string.pref_camera2_default, useValuesFromIntent);
+
+    // Get default codecs.
+    String videoCodec = sharedPrefGetString(R.string.pref_videocodec_key,
+        CallActivity.EXTRA_VIDEOCODEC, R.string.pref_videocodec_default, useValuesFromIntent);
+    String audioCodec = sharedPrefGetString(R.string.pref_audiocodec_key,
+        CallActivity.EXTRA_AUDIOCODEC, R.string.pref_audiocodec_default, useValuesFromIntent);
+
+    // Check HW codec flag.
+    boolean hwCodec = sharedPrefGetBoolean(R.string.pref_hwcodec_key,
+        CallActivity.EXTRA_HWCODEC_ENABLED, R.string.pref_hwcodec_default, useValuesFromIntent);
+
+    // Check Capture to texture.
+    boolean captureToTexture = sharedPrefGetBoolean(R.string.pref_capturetotexture_key,
+        CallActivity.EXTRA_CAPTURETOTEXTURE_ENABLED, R.string.pref_capturetotexture_default,
+        useValuesFromIntent);
+
+    // Check FlexFEC.
+    boolean flexfecEnabled = sharedPrefGetBoolean(R.string.pref_flexfec_key,
+        CallActivity.EXTRA_FLEXFEC_ENABLED, R.string.pref_flexfec_default, useValuesFromIntent);
+
+    // Check Disable Audio Processing flag.
+    boolean noAudioProcessing = sharedPrefGetBoolean(R.string.pref_noaudioprocessing_key,
+        CallActivity.EXTRA_NOAUDIOPROCESSING_ENABLED, R.string.pref_noaudioprocessing_default,
+        useValuesFromIntent);
+
+    boolean aecDump = sharedPrefGetBoolean(R.string.pref_aecdump_key,
+        CallActivity.EXTRA_AECDUMP_ENABLED, R.string.pref_aecdump_default, useValuesFromIntent);
+
+    boolean saveInputAudioToFile =
+        sharedPrefGetBoolean(R.string.pref_enable_save_input_audio_to_file_key,
+            CallActivity.EXTRA_SAVE_INPUT_AUDIO_TO_FILE_ENABLED,
+            R.string.pref_enable_save_input_audio_to_file_default, useValuesFromIntent);
+
+    // Check OpenSL ES enabled flag.
+    boolean useOpenSLES = sharedPrefGetBoolean(R.string.pref_opensles_key,
+        CallActivity.EXTRA_OPENSLES_ENABLED, R.string.pref_opensles_default, useValuesFromIntent);
+
+    // Check Disable built-in AEC flag.
+    boolean disableBuiltInAEC = sharedPrefGetBoolean(R.string.pref_disable_built_in_aec_key,
+        CallActivity.EXTRA_DISABLE_BUILT_IN_AEC, R.string.pref_disable_built_in_aec_default,
+        useValuesFromIntent);
+
+    // Check Disable built-in AGC flag.
+    boolean disableBuiltInAGC = sharedPrefGetBoolean(R.string.pref_disable_built_in_agc_key,
+        CallActivity.EXTRA_DISABLE_BUILT_IN_AGC, R.string.pref_disable_built_in_agc_default,
+        useValuesFromIntent);
+
+    // Check Disable built-in NS flag.
+    boolean disableBuiltInNS = sharedPrefGetBoolean(R.string.pref_disable_built_in_ns_key,
+        CallActivity.EXTRA_DISABLE_BUILT_IN_NS, R.string.pref_disable_built_in_ns_default,
+        useValuesFromIntent);
+
+    // Check Disable gain control
+    boolean disableWebRtcAGCAndHPF = sharedPrefGetBoolean(
+        R.string.pref_disable_webrtc_agc_and_hpf_key, CallActivity.EXTRA_DISABLE_WEBRTC_AGC_AND_HPF,
+        R.string.pref_disable_webrtc_agc_and_hpf_key, useValuesFromIntent);
+
+    // Get video resolution from settings.
+    int videoWidth = 0;
+    int videoHeight = 0;
+    if (useValuesFromIntent) {
+      videoWidth = getIntent().getIntExtra(CallActivity.EXTRA_VIDEO_WIDTH, 0);
+      videoHeight = getIntent().getIntExtra(CallActivity.EXTRA_VIDEO_HEIGHT, 0);
+    }
+    if (videoWidth == 0 && videoHeight == 0) {
+      String resolution =
+          sharedPref.getString(keyprefResolution, getString(R.string.pref_resolution_default));
+      String[] dimensions = resolution.split("[ x]+");
+      if (dimensions.length == 2) {
+        try {
+          videoWidth = Integer.parseInt(dimensions[0]);
+          videoHeight = Integer.parseInt(dimensions[1]);
+        } catch (NumberFormatException e) {
+          videoWidth = 0;
+          videoHeight = 0;
+          Log.e(TAG, "Wrong video resolution setting: " + resolution);
+        }
+      }
+    }
+
+    // Get camera fps from settings.
+    int cameraFps = 0;
+    if (useValuesFromIntent) {
+      cameraFps = getIntent().getIntExtra(CallActivity.EXTRA_VIDEO_FPS, 0);
+    }
+    if (cameraFps == 0) {
+      String fps = sharedPref.getString(keyprefFps, getString(R.string.pref_fps_default));
+      String[] fpsValues = fps.split("[ x]+");
+      if (fpsValues.length == 2) {
+        try {
+          cameraFps = Integer.parseInt(fpsValues[0]);
+        } catch (NumberFormatException e) {
+          cameraFps = 0;
+          Log.e(TAG, "Wrong camera fps setting: " + fps);
+        }
+      }
+    }
+
+    // Check capture quality slider flag.
+    boolean captureQualitySlider = sharedPrefGetBoolean(R.string.pref_capturequalityslider_key,
+        CallActivity.EXTRA_VIDEO_CAPTUREQUALITYSLIDER_ENABLED,
+        R.string.pref_capturequalityslider_default, useValuesFromIntent);
+
+    // Get video and audio start bitrate.
+    int videoStartBitrate = 0;
+    if (useValuesFromIntent) {
+      videoStartBitrate = getIntent().getIntExtra(CallActivity.EXTRA_VIDEO_BITRATE, 0);
+    }
+    if (videoStartBitrate == 0) {
+      String bitrateTypeDefault = getString(R.string.pref_maxvideobitrate_default);
+      String bitrateType = sharedPref.getString(keyprefVideoBitrateType, bitrateTypeDefault);
+      if (!bitrateType.equals(bitrateTypeDefault)) {
+        String bitrateValue = sharedPref.getString(
+            keyprefVideoBitrateValue, getString(R.string.pref_maxvideobitratevalue_default));
+        videoStartBitrate = Integer.parseInt(bitrateValue);
+      }
+    }
+
+    int audioStartBitrate = 0;
+    if (useValuesFromIntent) {
+      audioStartBitrate = getIntent().getIntExtra(CallActivity.EXTRA_AUDIO_BITRATE, 0);
+    }
+    if (audioStartBitrate == 0) {
+      String bitrateTypeDefault = getString(R.string.pref_startaudiobitrate_default);
+      String bitrateType = sharedPref.getString(keyprefAudioBitrateType, bitrateTypeDefault);
+      if (!bitrateType.equals(bitrateTypeDefault)) {
+        String bitrateValue = sharedPref.getString(
+            keyprefAudioBitrateValue, getString(R.string.pref_startaudiobitratevalue_default));
+        audioStartBitrate = Integer.parseInt(bitrateValue);
+      }
+    }
+
+    // Check statistics display option.
+    boolean displayHud = sharedPrefGetBoolean(R.string.pref_displayhud_key,
+        CallActivity.EXTRA_DISPLAY_HUD, R.string.pref_displayhud_default, useValuesFromIntent);
+
+    boolean tracing = sharedPrefGetBoolean(R.string.pref_tracing_key, CallActivity.EXTRA_TRACING,
+        R.string.pref_tracing_default, useValuesFromIntent);
+
+    // Check Enable RtcEventLog.
+    boolean rtcEventLogEnabled = sharedPrefGetBoolean(R.string.pref_enable_rtceventlog_key,
+        CallActivity.EXTRA_ENABLE_RTCEVENTLOG, R.string.pref_enable_rtceventlog_default,
+        useValuesFromIntent);
+
+    // Get datachannel options
+    boolean dataChannelEnabled = sharedPrefGetBoolean(R.string.pref_enable_datachannel_key,
+        CallActivity.EXTRA_DATA_CHANNEL_ENABLED, R.string.pref_enable_datachannel_default,
+        useValuesFromIntent);
+    boolean ordered = sharedPrefGetBoolean(R.string.pref_ordered_key, CallActivity.EXTRA_ORDERED,
+        R.string.pref_ordered_default, useValuesFromIntent);
+    boolean negotiated = sharedPrefGetBoolean(R.string.pref_negotiated_key,
+        CallActivity.EXTRA_NEGOTIATED, R.string.pref_negotiated_default, useValuesFromIntent);
+    int maxRetrMs = sharedPrefGetInteger(R.string.pref_max_retransmit_time_ms_key,
+        CallActivity.EXTRA_MAX_RETRANSMITS_MS, R.string.pref_max_retransmit_time_ms_default,
+        useValuesFromIntent);
+    int maxRetr =
+        sharedPrefGetInteger(R.string.pref_max_retransmits_key, CallActivity.EXTRA_MAX_RETRANSMITS,
+            R.string.pref_max_retransmits_default, useValuesFromIntent);
+    int id = sharedPrefGetInteger(R.string.pref_data_id_key, CallActivity.EXTRA_ID,
+        R.string.pref_data_id_default, useValuesFromIntent);
+    String protocol = sharedPrefGetString(R.string.pref_data_protocol_key,
+        CallActivity.EXTRA_PROTOCOL, R.string.pref_data_protocol_default, useValuesFromIntent);
+
+    // Start AppRTCMobile activity.
+    Log.d(TAG, "Connecting to room " + roomId + " at URL " + roomUrl);
+    if (validateUrl(roomUrl)) {
+      Uri uri = Uri.parse(roomUrl);
+      Intent intent = new Intent(this, CallActivity.class);
+      intent.setData(uri);
+      intent.putExtra(CallActivity.EXTRA_ROOMID, roomId);
+      intent.putExtra(CallActivity.EXTRA_LOOPBACK, loopback);
+      intent.putExtra(CallActivity.EXTRA_VIDEO_CALL, videoCallEnabled);
+      intent.putExtra(CallActivity.EXTRA_SCREENCAPTURE, useScreencapture);
+      intent.putExtra(CallActivity.EXTRA_CAMERA2, useCamera2);
+      intent.putExtra(CallActivity.EXTRA_VIDEO_WIDTH, videoWidth);
+      intent.putExtra(CallActivity.EXTRA_VIDEO_HEIGHT, videoHeight);
+      intent.putExtra(CallActivity.EXTRA_VIDEO_FPS, cameraFps);
+      intent.putExtra(CallActivity.EXTRA_VIDEO_CAPTUREQUALITYSLIDER_ENABLED, captureQualitySlider);
+      intent.putExtra(CallActivity.EXTRA_VIDEO_BITRATE, videoStartBitrate);
+      intent.putExtra(CallActivity.EXTRA_VIDEOCODEC, videoCodec);
+      intent.putExtra(CallActivity.EXTRA_HWCODEC_ENABLED, hwCodec);
+      intent.putExtra(CallActivity.EXTRA_CAPTURETOTEXTURE_ENABLED, captureToTexture);
+      intent.putExtra(CallActivity.EXTRA_FLEXFEC_ENABLED, flexfecEnabled);
+      intent.putExtra(CallActivity.EXTRA_NOAUDIOPROCESSING_ENABLED, noAudioProcessing);
+      intent.putExtra(CallActivity.EXTRA_AECDUMP_ENABLED, aecDump);
+      intent.putExtra(CallActivity.EXTRA_SAVE_INPUT_AUDIO_TO_FILE_ENABLED, saveInputAudioToFile);
+      intent.putExtra(CallActivity.EXTRA_OPENSLES_ENABLED, useOpenSLES);
+      intent.putExtra(CallActivity.EXTRA_DISABLE_BUILT_IN_AEC, disableBuiltInAEC);
+      intent.putExtra(CallActivity.EXTRA_DISABLE_BUILT_IN_AGC, disableBuiltInAGC);
+      intent.putExtra(CallActivity.EXTRA_DISABLE_BUILT_IN_NS, disableBuiltInNS);
+      intent.putExtra(CallActivity.EXTRA_DISABLE_WEBRTC_AGC_AND_HPF, disableWebRtcAGCAndHPF);
+      intent.putExtra(CallActivity.EXTRA_AUDIO_BITRATE, audioStartBitrate);
+      intent.putExtra(CallActivity.EXTRA_AUDIOCODEC, audioCodec);
+      intent.putExtra(CallActivity.EXTRA_DISPLAY_HUD, displayHud);
+      intent.putExtra(CallActivity.EXTRA_TRACING, tracing);
+      intent.putExtra(CallActivity.EXTRA_ENABLE_RTCEVENTLOG, rtcEventLogEnabled);
+      intent.putExtra(CallActivity.EXTRA_CMDLINE, commandLineRun);
+      intent.putExtra(CallActivity.EXTRA_RUNTIME, runTimeMs);
+      intent.putExtra(CallActivity.EXTRA_DATA_CHANNEL_ENABLED, dataChannelEnabled);
+
+      if (dataChannelEnabled) {
+        intent.putExtra(CallActivity.EXTRA_ORDERED, ordered);
+        intent.putExtra(CallActivity.EXTRA_MAX_RETRANSMITS_MS, maxRetrMs);
+        intent.putExtra(CallActivity.EXTRA_MAX_RETRANSMITS, maxRetr);
+        intent.putExtra(CallActivity.EXTRA_PROTOCOL, protocol);
+        intent.putExtra(CallActivity.EXTRA_NEGOTIATED, negotiated);
+        intent.putExtra(CallActivity.EXTRA_ID, id);
+      }
+
+      if (useValuesFromIntent) {
+        if (getIntent().hasExtra(CallActivity.EXTRA_VIDEO_FILE_AS_CAMERA)) {
+          String videoFileAsCamera =
+              getIntent().getStringExtra(CallActivity.EXTRA_VIDEO_FILE_AS_CAMERA);
+          intent.putExtra(CallActivity.EXTRA_VIDEO_FILE_AS_CAMERA, videoFileAsCamera);
+        }
+
+        if (getIntent().hasExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE)) {
+          String saveRemoteVideoToFile =
+              getIntent().getStringExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE);
+          intent.putExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE, saveRemoteVideoToFile);
+        }
+
+        if (getIntent().hasExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_WIDTH)) {
+          int videoOutWidth =
+              getIntent().getIntExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_WIDTH, 0);
+          intent.putExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_WIDTH, videoOutWidth);
+        }
+
+        if (getIntent().hasExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_HEIGHT)) {
+          int videoOutHeight =
+              getIntent().getIntExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_HEIGHT, 0);
+          intent.putExtra(CallActivity.EXTRA_SAVE_REMOTE_VIDEO_TO_FILE_HEIGHT, videoOutHeight);
+        }
+      }
+
+      startActivityForResult(intent, CONNECTION_REQUEST);
+    }
+  }
+
+  private boolean validateUrl(String url) {
+    if (URLUtil.isHttpsUrl(url) || URLUtil.isHttpUrl(url)) {
+      return true;
+    }
+
+    new AlertDialog.Builder(this)
+        .setTitle(getText(R.string.invalid_url_title))
+        .setMessage(getString(R.string.invalid_url_text, url))
+        .setCancelable(false)
+        .setNeutralButton(R.string.ok,
+            new DialogInterface.OnClickListener() {
+              @Override
+              public void onClick(DialogInterface dialog, int id) {
+                dialog.cancel();
+              }
+            })
+        .create()
+        .show();
+    return false;
+  }
+
+  private final AdapterView.OnItemClickListener roomListClickListener =
+      new AdapterView.OnItemClickListener() {
+        @Override
+        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
+          String roomId = ((TextView) view).getText().toString();
+          connectToRoom(roomId, false, false, false, 0);
+        }
+      };
+
+  private final OnClickListener addFavoriteListener = new OnClickListener() {
+    @Override
+    public void onClick(View view) {
+      String newRoom = roomEditText.getText().toString();
+      if (newRoom.length() > 0 && !roomList.contains(newRoom)) {
+        adapter.add(newRoom);
+        adapter.notifyDataSetChanged();
+      }
+    }
+  };
+
+  private final OnClickListener connectListener = new OnClickListener() {
+    @Override
+    public void onClick(View view) {
+      connectToRoom(roomEditText.getText().toString(), false, false, false, 0);
+    }
+  };
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CpuMonitor.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CpuMonitor.java
new file mode 100644
index 0000000000..1c64621864
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/CpuMonitor.java
@@ -0,0 +1,521 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.BatteryManager;
+import android.os.Build;
+import android.os.SystemClock;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.Scanner;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Simple CPU monitor.  The caller creates a CpuMonitor object which can then
+ * be used via sampleCpuUtilization() to collect the percentual use of the
+ * cumulative CPU capacity for all CPUs running at their nominal frequency.  3
+ * values are generated: (1) getCpuCurrent() returns the use since the last
+ * sampleCpuUtilization(), (2) getCpuAvg3() returns the use since 3 prior
+ * calls, and (3) getCpuAvgAll() returns the use over all SAMPLE_SAVE_NUMBER
+ * calls.
+ *
+ * <p>CPUs in Android are often "offline", and while this of course means 0 Hz
+ * as current frequency, in this state we cannot even get their nominal
+ * frequency.  We therefore tread carefully, and allow any CPU to be missing.
+ * Missing CPUs are assumed to have the same nominal frequency as any close
+ * lower-numbered CPU, but as soon as it is online, we'll get their proper
+ * frequency and remember it.  (Since CPU 0 in practice always seem to be
+ * online, this unidirectional frequency inheritance should be no problem in
+ * practice.)
+ *
+ * <p>Caveats:
+ *   o No provision made for zany "turbo" mode, common in the x86 world.
+ *   o No provision made for ARM big.LITTLE; if CPU n can switch behind our
+ *     back, we might get incorrect estimates.
+ *   o This is not thread-safe.  To call asynchronously, create different
+ *     CpuMonitor objects.
+ *
+ * <p>If we can gather enough info to generate a sensible result,
+ * sampleCpuUtilization returns true.  It is designed to never throw an
+ * exception.
+ *
+ * <p>sampleCpuUtilization should not be called too often in its present form,
+ * since then deltas would be small and the percent values would fluctuate and
+ * be unreadable. If it is desirable to call it more often than say once per
+ * second, one would need to increase SAMPLE_SAVE_NUMBER and probably use
+ * Queue<Integer> to avoid copying overhead.
+ *
+ * <p>Known problems:
+ *   1. Nexus 7 devices running Kitkat have a kernel which often output an
+ *      incorrect 'idle' field in /proc/stat.  The value is close to twice the
+ *      correct value, and then returns to back to correct reading.  Both when
+ *      jumping up and back down we might create faulty CPU load readings.
+ */
+class CpuMonitor {
+  private static final String TAG = "CpuMonitor";
+  private static final int MOVING_AVERAGE_SAMPLES = 5;
+
+  private static final int CPU_STAT_SAMPLE_PERIOD_MS = 2000;
+  private static final int CPU_STAT_LOG_PERIOD_MS = 6000;
+
+  private final Context appContext;
+  // User CPU usage at current frequency.
+  private final MovingAverage userCpuUsage;
+  // System CPU usage at current frequency.
+  private final MovingAverage systemCpuUsage;
+  // Total CPU usage relative to maximum frequency.
+  private final MovingAverage totalCpuUsage;
+  // CPU frequency in percentage from maximum.
+  private final MovingAverage frequencyScale;
+
+  @Nullable
+  private ScheduledExecutorService executor;
+  private long lastStatLogTimeMs;
+  private long[] cpuFreqMax;
+  private int cpusPresent;
+  private int actualCpusPresent;
+  private boolean initialized;
+  private boolean cpuOveruse;
+  private String[] maxPath;
+  private String[] curPath;
+  private double[] curFreqScales;
+  @Nullable
+  private ProcStat lastProcStat;
+
+  private static class ProcStat {
+    final long userTime;
+    final long systemTime;
+    final long idleTime;
+
+    ProcStat(long userTime, long systemTime, long idleTime) {
+      this.userTime = userTime;
+      this.systemTime = systemTime;
+      this.idleTime = idleTime;
+    }
+  }
+
+  private static class MovingAverage {
+    private final int size;
+    private double sum;
+    private double currentValue;
+    private double[] circBuffer;
+    private int circBufferIndex;
+
+    public MovingAverage(int size) {
+      if (size <= 0) {
+        throw new AssertionError("Size value in MovingAverage ctor should be positive.");
+      }
+      this.size = size;
+      circBuffer = new double[size];
+    }
+
+    public void reset() {
+      Arrays.fill(circBuffer, 0);
+      circBufferIndex = 0;
+      sum = 0;
+      currentValue = 0;
+    }
+
+    public void addValue(double value) {
+      sum -= circBuffer[circBufferIndex];
+      circBuffer[circBufferIndex++] = value;
+      currentValue = value;
+      sum += value;
+      if (circBufferIndex >= size) {
+        circBufferIndex = 0;
+      }
+    }
+
+    public double getCurrent() {
+      return currentValue;
+    }
+
+    public double getAverage() {
+      return sum / (double) size;
+    }
+  }
+
+  public static boolean isSupported() {
+    return Build.VERSION.SDK_INT < Build.VERSION_CODES.N;
+  }
+
+  public CpuMonitor(Context context) {
+    if (!isSupported()) {
+      throw new RuntimeException("CpuMonitor is not supported on this Android version.");
+    }
+
+    Log.d(TAG, "CpuMonitor ctor.");
+    appContext = context.getApplicationContext();
+    userCpuUsage = new MovingAverage(MOVING_AVERAGE_SAMPLES);
+    systemCpuUsage = new MovingAverage(MOVING_AVERAGE_SAMPLES);
+    totalCpuUsage = new MovingAverage(MOVING_AVERAGE_SAMPLES);
+    frequencyScale = new MovingAverage(MOVING_AVERAGE_SAMPLES);
+    lastStatLogTimeMs = SystemClock.elapsedRealtime();
+
+    scheduleCpuUtilizationTask();
+  }
+
+  public void pause() {
+    if (executor != null) {
+      Log.d(TAG, "pause");
+      executor.shutdownNow();
+      executor = null;
+    }
+  }
+
+  public void resume() {
+    Log.d(TAG, "resume");
+    resetStat();
+    scheduleCpuUtilizationTask();
+  }
+
+  // TODO(bugs.webrtc.org/8491): Remove NoSynchronizedMethodCheck suppression.
+  @SuppressWarnings("NoSynchronizedMethodCheck")
+  public synchronized void reset() {
+    if (executor != null) {
+      Log.d(TAG, "reset");
+      resetStat();
+      cpuOveruse = false;
+    }
+  }
+
+  // TODO(bugs.webrtc.org/8491): Remove NoSynchronizedMethodCheck suppression.
+  @SuppressWarnings("NoSynchronizedMethodCheck")
+  public synchronized int getCpuUsageCurrent() {
+    return doubleToPercent(userCpuUsage.getCurrent() + systemCpuUsage.getCurrent());
+  }
+
+  // TODO(bugs.webrtc.org/8491): Remove NoSynchronizedMethodCheck suppression.
+  @SuppressWarnings("NoSynchronizedMethodCheck")
+  public synchronized int getCpuUsageAverage() {
+    return doubleToPercent(userCpuUsage.getAverage() + systemCpuUsage.getAverage());
+  }
+
+  // TODO(bugs.webrtc.org/8491): Remove NoSynchronizedMethodCheck suppression.
+  @SuppressWarnings("NoSynchronizedMethodCheck")
+  public synchronized int getFrequencyScaleAverage() {
+    return doubleToPercent(frequencyScale.getAverage());
+  }
+
+  private void scheduleCpuUtilizationTask() {
+    if (executor != null) {
+      executor.shutdownNow();
+      executor = null;
+    }
+
+    executor = Executors.newSingleThreadScheduledExecutor();
+    @SuppressWarnings("unused") // Prevent downstream linter warnings.
+    Future<?> possiblyIgnoredError = executor.scheduleAtFixedRate(new Runnable() {
+      @Override
+      public void run() {
+        cpuUtilizationTask();
+      }
+    }, 0, CPU_STAT_SAMPLE_PERIOD_MS, TimeUnit.MILLISECONDS);
+  }
+
+  private void cpuUtilizationTask() {
+    boolean cpuMonitorAvailable = sampleCpuUtilization();
+    if (cpuMonitorAvailable
+        && SystemClock.elapsedRealtime() - lastStatLogTimeMs >= CPU_STAT_LOG_PERIOD_MS) {
+      lastStatLogTimeMs = SystemClock.elapsedRealtime();
+      String statString = getStatString();
+      Log.d(TAG, statString);
+    }
+  }
+
+  private void init() {
+    try (FileInputStream fin = new FileInputStream("/sys/devices/system/cpu/present");
+         InputStreamReader streamReader = new InputStreamReader(fin, Charset.forName("UTF-8"));
+         BufferedReader reader = new BufferedReader(streamReader);
+         Scanner scanner = new Scanner(reader).useDelimiter("[-\n]");) {
+      scanner.nextInt(); // Skip leading number 0.
+      cpusPresent = 1 + scanner.nextInt();
+      scanner.close();
+    } catch (FileNotFoundException e) {
+      Log.e(TAG, "Cannot do CPU stats since /sys/devices/system/cpu/present is missing");
+    } catch (IOException e) {
+      Log.e(TAG, "Error closing file");
+    } catch (Exception e) {
+      Log.e(TAG, "Cannot do CPU stats due to /sys/devices/system/cpu/present parsing problem");
+    }
+
+    cpuFreqMax = new long[cpusPresent];
+    maxPath = new String[cpusPresent];
+    curPath = new String[cpusPresent];
+    curFreqScales = new double[cpusPresent];
+    for (int i = 0; i < cpusPresent; i++) {
+      cpuFreqMax[i] = 0; // Frequency "not yet determined".
+      curFreqScales[i] = 0;
+      maxPath[i] = "/sys/devices/system/cpu/cpu" + i + "/cpufreq/cpuinfo_max_freq";
+      curPath[i] = "/sys/devices/system/cpu/cpu" + i + "/cpufreq/scaling_cur_freq";
+    }
+
+    lastProcStat = new ProcStat(0, 0, 0);
+    resetStat();
+
+    initialized = true;
+  }
+
+  private synchronized void resetStat() {
+    userCpuUsage.reset();
+    systemCpuUsage.reset();
+    totalCpuUsage.reset();
+    frequencyScale.reset();
+    lastStatLogTimeMs = SystemClock.elapsedRealtime();
+  }
+
+  private int getBatteryLevel() {
+    // Use sticky broadcast with null receiver to read battery level once only.
+    Intent intent = appContext.registerReceiver(
+        null /* receiver */, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
+
+    int batteryLevel = 0;
+    int batteryScale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
+    if (batteryScale > 0) {
+      batteryLevel =
+          (int) (100f * intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0) / batteryScale);
+    }
+    return batteryLevel;
+  }
+
+  /**
+   * Re-measure CPU use.  Call this method at an interval of around 1/s.
+   * This method returns true on success.  The fields
+   * cpuCurrent, cpuAvg3, and cpuAvgAll are updated on success, and represents:
+   * cpuCurrent: The CPU use since the last sampleCpuUtilization call.
+   * cpuAvg3: The average CPU over the last 3 calls.
+   * cpuAvgAll: The average CPU over the last SAMPLE_SAVE_NUMBER calls.
+   */
+  private synchronized boolean sampleCpuUtilization() {
+    long lastSeenMaxFreq = 0;
+    long cpuFreqCurSum = 0;
+    long cpuFreqMaxSum = 0;
+
+    if (!initialized) {
+      init();
+    }
+    if (cpusPresent == 0) {
+      return false;
+    }
+
+    actualCpusPresent = 0;
+    for (int i = 0; i < cpusPresent; i++) {
+      /*
+       * For each CPU, attempt to first read its max frequency, then its
+       * current frequency.  Once as the max frequency for a CPU is found,
+       * save it in cpuFreqMax[].
+       */
+
+      curFreqScales[i] = 0;
+      if (cpuFreqMax[i] == 0) {
+        // We have never found this CPU's max frequency.  Attempt to read it.
+        long cpufreqMax = readFreqFromFile(maxPath[i]);
+        if (cpufreqMax > 0) {
+          Log.d(TAG, "Core " + i + ". Max frequency: " + cpufreqMax);
+          lastSeenMaxFreq = cpufreqMax;
+          cpuFreqMax[i] = cpufreqMax;
+          maxPath[i] = null; // Kill path to free its memory.
+        }
+      } else {
+        lastSeenMaxFreq = cpuFreqMax[i]; // A valid, previously read value.
+      }
+
+      long cpuFreqCur = readFreqFromFile(curPath[i]);
+      if (cpuFreqCur == 0 && lastSeenMaxFreq == 0) {
+        // No current frequency information for this CPU core - ignore it.
+        continue;
+      }
+      if (cpuFreqCur > 0) {
+        actualCpusPresent++;
+      }
+      cpuFreqCurSum += cpuFreqCur;
+
+      /* Here, lastSeenMaxFreq might come from
+       * 1. cpuFreq[i], or
+       * 2. a previous iteration, or
+       * 3. a newly read value, or
+       * 4. hypothetically from the pre-loop dummy.
+       */
+      cpuFreqMaxSum += lastSeenMaxFreq;
+      if (lastSeenMaxFreq > 0) {
+        curFreqScales[i] = (double) cpuFreqCur / lastSeenMaxFreq;
+      }
+    }
+
+    if (cpuFreqCurSum == 0 || cpuFreqMaxSum == 0) {
+      Log.e(TAG, "Could not read max or current frequency for any CPU");
+      return false;
+    }
+
+    /*
+     * Since the cycle counts are for the period between the last invocation
+     * and this present one, we average the percentual CPU frequencies between
+     * now and the beginning of the measurement period.  This is significantly
+     * incorrect only if the frequencies have peeked or dropped in between the
+     * invocations.
+     */
+    double currentFrequencyScale = cpuFreqCurSum / (double) cpuFreqMaxSum;
+    if (frequencyScale.getCurrent() > 0) {
+      currentFrequencyScale = (frequencyScale.getCurrent() + currentFrequencyScale) * 0.5;
+    }
+
+    ProcStat procStat = readProcStat();
+    if (procStat == null) {
+      return false;
+    }
+
+    long diffUserTime = procStat.userTime - lastProcStat.userTime;
+    long diffSystemTime = procStat.systemTime - lastProcStat.systemTime;
+    long diffIdleTime = procStat.idleTime - lastProcStat.idleTime;
+    long allTime = diffUserTime + diffSystemTime + diffIdleTime;
+
+    if (currentFrequencyScale == 0 || allTime == 0) {
+      return false;
+    }
+
+    // Update statistics.
+    frequencyScale.addValue(currentFrequencyScale);
+
+    double currentUserCpuUsage = diffUserTime / (double) allTime;
+    userCpuUsage.addValue(currentUserCpuUsage);
+
+    double currentSystemCpuUsage = diffSystemTime / (double) allTime;
+    systemCpuUsage.addValue(currentSystemCpuUsage);
+
+    double currentTotalCpuUsage =
+        (currentUserCpuUsage + currentSystemCpuUsage) * currentFrequencyScale;
+    totalCpuUsage.addValue(currentTotalCpuUsage);
+
+    // Save new measurements for next round's deltas.
+    lastProcStat = procStat;
+
+    return true;
+  }
+
+  private int doubleToPercent(double d) {
+    return (int) (d * 100 + 0.5);
+  }
+
+  private synchronized String getStatString() {
+    StringBuilder stat = new StringBuilder();
+    stat.append("CPU User: ")
+        .append(doubleToPercent(userCpuUsage.getCurrent()))
+        .append("/")
+        .append(doubleToPercent(userCpuUsage.getAverage()))
+        .append(". System: ")
+        .append(doubleToPercent(systemCpuUsage.getCurrent()))
+        .append("/")
+        .append(doubleToPercent(systemCpuUsage.getAverage()))
+        .append(". Freq: ")
+        .append(doubleToPercent(frequencyScale.getCurrent()))
+        .append("/")
+        .append(doubleToPercent(frequencyScale.getAverage()))
+        .append(". Total usage: ")
+        .append(doubleToPercent(totalCpuUsage.getCurrent()))
+        .append("/")
+        .append(doubleToPercent(totalCpuUsage.getAverage()))
+        .append(". Cores: ")
+        .append(actualCpusPresent);
+    stat.append("( ");
+    for (int i = 0; i < cpusPresent; i++) {
+      stat.append(doubleToPercent(curFreqScales[i])).append(" ");
+    }
+    stat.append("). Battery: ").append(getBatteryLevel());
+    if (cpuOveruse) {
+      stat.append(". Overuse.");
+    }
+    return stat.toString();
+  }
+
+  /**
+   * Read a single integer value from the named file.  Return the read value
+   * or if an error occurs return 0.
+   */
+  private long readFreqFromFile(String fileName) {
+    long number = 0;
+    try (FileInputStream stream = new FileInputStream(fileName);
+         InputStreamReader streamReader = new InputStreamReader(stream, Charset.forName("UTF-8"));
+         BufferedReader reader = new BufferedReader(streamReader)) {
+      String line = reader.readLine();
+      number = parseLong(line);
+    } catch (FileNotFoundException e) {
+      // CPU core is off, so file with its scaling frequency .../cpufreq/scaling_cur_freq
+      // is not present. This is not an error.
+    } catch (IOException e) {
+      // CPU core is off, so file with its scaling frequency .../cpufreq/scaling_cur_freq
+      // is empty. This is not an error.
+    }
+    return number;
+  }
+
+  private static long parseLong(String value) {
+    long number = 0;
+    try {
+      number = Long.parseLong(value);
+    } catch (NumberFormatException e) {
+      Log.e(TAG, "parseLong error.", e);
+    }
+    return number;
+  }
+
+  /*
+   * Read the current utilization of all CPUs using the cumulative first line
+   * of /proc/stat.
+   */
+  @SuppressWarnings("StringSplitter")
+  private @Nullable ProcStat readProcStat() {
+    long userTime = 0;
+    long systemTime = 0;
+    long idleTime = 0;
+    try (FileInputStream stream = new FileInputStream("/proc/stat");
+         InputStreamReader streamReader = new InputStreamReader(stream, Charset.forName("UTF-8"));
+         BufferedReader reader = new BufferedReader(streamReader)) {
+      // line should contain something like this:
+      // cpu  5093818 271838 3512830 165934119 101374 447076 272086 0 0 0
+      //       user    nice  system     idle   iowait  irq   softirq
+      String line = reader.readLine();
+      String[] lines = line.split("\\s+");
+      int length = lines.length;
+      if (length >= 5) {
+        userTime = parseLong(lines[1]); // user
+        userTime += parseLong(lines[2]); // nice
+        systemTime = parseLong(lines[3]); // system
+        idleTime = parseLong(lines[4]); // idle
+      }
+      if (length >= 8) {
+        userTime += parseLong(lines[5]); // iowait
+        systemTime += parseLong(lines[6]); // irq
+        systemTime += parseLong(lines[7]); // softirq
+      }
+    } catch (FileNotFoundException e) {
+      Log.e(TAG, "Cannot open /proc/stat for reading", e);
+      return null;
+    } catch (Exception e) {
+      Log.e(TAG, "Problems parsing /proc/stat", e);
+      return null;
+    }
+    return new ProcStat(userTime, systemTime, idleTime);
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/DirectRTCClient.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/DirectRTCClient.java
new file mode 100644
index 0000000000..1b113e1398
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/DirectRTCClient.java
@@ -0,0 +1,346 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.util.Log;
+import androidx.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.webrtc.IceCandidate;
+import org.webrtc.SessionDescription;
+
+/**
+ * Implementation of AppRTCClient that uses direct TCP connection as the signaling channel.
+ * This eliminates the need for an external server. This class does not support loopback
+ * connections.
+ */
+public class DirectRTCClient implements AppRTCClient, TCPChannelClient.TCPChannelEvents {
+  private static final String TAG = "DirectRTCClient";
+  private static final int DEFAULT_PORT = 8888;
+
+  // Regex pattern used for checking if room id looks like an IP.
+  static final Pattern IP_PATTERN = Pattern.compile("("
+      // IPv4
+      + "((\\d+\\.){3}\\d+)|"
+      // IPv6
+      + "\\[((([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?::"
+      + "(([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?)\\]|"
+      + "\\[(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4})\\]|"
+      // IPv6 without []
+      + "((([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?::(([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?)|"
+      + "(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4})|"
+      // Literals
+      + "localhost"
+      + ")"
+      // Optional port number
+      + "(:(\\d+))?");
+
+  private final ExecutorService executor;
+  private final SignalingEvents events;
+  @Nullable
+  private TCPChannelClient tcpClient;
+  private RoomConnectionParameters connectionParameters;
+
+  private enum ConnectionState { NEW, CONNECTED, CLOSED, ERROR }
+
+  // All alterations of the room state should be done from inside the looper thread.
+  private ConnectionState roomState;
+
+  public DirectRTCClient(SignalingEvents events) {
+    this.events = events;
+
+    executor = Executors.newSingleThreadExecutor();
+    roomState = ConnectionState.NEW;
+  }
+
+  /**
+   * Connects to the room, roomId in connectionsParameters is required. roomId must be a valid
+   * IP address matching IP_PATTERN.
+   */
+  @Override
+  public void connectToRoom(RoomConnectionParameters connectionParameters) {
+    this.connectionParameters = connectionParameters;
+
+    if (connectionParameters.loopback) {
+      reportError("Loopback connections aren't supported by DirectRTCClient.");
+    }
+
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        connectToRoomInternal();
+      }
+    });
+  }
+
+  @Override
+  public void disconnectFromRoom() {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        disconnectFromRoomInternal();
+      }
+    });
+  }
+
+  /**
+   * Connects to the room.
+   *
+   * Runs on the looper thread.
+   */
+  private void connectToRoomInternal() {
+    this.roomState = ConnectionState.NEW;
+
+    String endpoint = connectionParameters.roomId;
+
+    Matcher matcher = IP_PATTERN.matcher(endpoint);
+    if (!matcher.matches()) {
+      reportError("roomId must match IP_PATTERN for DirectRTCClient.");
+      return;
+    }
+
+    String ip = matcher.group(1);
+    String portStr = matcher.group(matcher.groupCount());
+    int port;
+
+    if (portStr != null) {
+      try {
+        port = Integer.parseInt(portStr);
+      } catch (NumberFormatException e) {
+        reportError("Invalid port number: " + portStr);
+        return;
+      }
+    } else {
+      port = DEFAULT_PORT;
+    }
+
+    tcpClient = new TCPChannelClient(executor, this, ip, port);
+  }
+
+  /**
+   * Disconnects from the room.
+   *
+   * Runs on the looper thread.
+   */
+  private void disconnectFromRoomInternal() {
+    roomState = ConnectionState.CLOSED;
+
+    if (tcpClient != null) {
+      tcpClient.disconnect();
+      tcpClient = null;
+    }
+    executor.shutdown();
+  }
+
+  @Override
+  public void sendOfferSdp(final SessionDescription sdp) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        if (roomState != ConnectionState.CONNECTED) {
+          reportError("Sending offer SDP in non connected state.");
+          return;
+        }
+        JSONObject json = new JSONObject();
+        jsonPut(json, "sdp", sdp.description);
+        jsonPut(json, "type", "offer");
+        sendMessage(json.toString());
+      }
+    });
+  }
+
+  @Override
+  public void sendAnswerSdp(final SessionDescription sdp) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        JSONObject json = new JSONObject();
+        jsonPut(json, "sdp", sdp.description);
+        jsonPut(json, "type", "answer");
+        sendMessage(json.toString());
+      }
+    });
+  }
+
+  @Override
+  public void sendLocalIceCandidate(final IceCandidate candidate) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        JSONObject json = new JSONObject();
+        jsonPut(json, "type", "candidate");
+        jsonPut(json, "label", candidate.sdpMLineIndex);
+        jsonPut(json, "id", candidate.sdpMid);
+        jsonPut(json, "candidate", candidate.sdp);
+
+        if (roomState != ConnectionState.CONNECTED) {
+          reportError("Sending ICE candidate in non connected state.");
+          return;
+        }
+        sendMessage(json.toString());
+      }
+    });
+  }
+
+  /** Send removed Ice candidates to the other participant. */
+  @Override
+  public void sendLocalIceCandidateRemovals(final IceCandidate[] candidates) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        JSONObject json = new JSONObject();
+        jsonPut(json, "type", "remove-candidates");
+        JSONArray jsonArray = new JSONArray();
+        for (final IceCandidate candidate : candidates) {
+          jsonArray.put(toJsonCandidate(candidate));
+        }
+        jsonPut(json, "candidates", jsonArray);
+
+        if (roomState != ConnectionState.CONNECTED) {
+          reportError("Sending ICE candidate removals in non connected state.");
+          return;
+        }
+        sendMessage(json.toString());
+      }
+    });
+  }
+
+  // -------------------------------------------------------------------
+  // TCPChannelClient event handlers
+
+  /**
+   * If the client is the server side, this will trigger onConnectedToRoom.
+   */
+  @Override
+  public void onTCPConnected(boolean isServer) {
+    if (isServer) {
+      roomState = ConnectionState.CONNECTED;
+
+      SignalingParameters parameters = new SignalingParameters(
+          // Ice servers are not needed for direct connections.
+          new ArrayList<>(),
+          isServer, // Server side acts as the initiator on direct connections.
+          null, // clientId
+          null, // wssUrl
+          null, // wwsPostUrl
+          null, // offerSdp
+          null // iceCandidates
+          );
+      events.onConnectedToRoom(parameters);
+    }
+  }
+
+  @Override
+  public void onTCPMessage(String msg) {
+    try {
+      JSONObject json = new JSONObject(msg);
+      String type = json.optString("type");
+      if (type.equals("candidate")) {
+        events.onRemoteIceCandidate(toJavaCandidate(json));
+      } else if (type.equals("remove-candidates")) {
+        JSONArray candidateArray = json.getJSONArray("candidates");
+        IceCandidate[] candidates = new IceCandidate[candidateArray.length()];
+        for (int i = 0; i < candidateArray.length(); ++i) {
+          candidates[i] = toJavaCandidate(candidateArray.getJSONObject(i));
+        }
+        events.onRemoteIceCandidatesRemoved(candidates);
+      } else if (type.equals("answer")) {
+        SessionDescription sdp = new SessionDescription(
+            SessionDescription.Type.fromCanonicalForm(type), json.getString("sdp"));
+        events.onRemoteDescription(sdp);
+      } else if (type.equals("offer")) {
+        SessionDescription sdp = new SessionDescription(
+            SessionDescription.Type.fromCanonicalForm(type), json.getString("sdp"));
+
+        SignalingParameters parameters = new SignalingParameters(
+            // Ice servers are not needed for direct connections.
+            new ArrayList<>(),
+            false, // This code will only be run on the client side. So, we are not the initiator.
+            null, // clientId
+            null, // wssUrl
+            null, // wssPostUrl
+            sdp, // offerSdp
+            null // iceCandidates
+            );
+        roomState = ConnectionState.CONNECTED;
+        events.onConnectedToRoom(parameters);
+      } else {
+        reportError("Unexpected TCP message: " + msg);
+      }
+    } catch (JSONException e) {
+      reportError("TCP message JSON parsing error: " + e.toString());
+    }
+  }
+
+  @Override
+  public void onTCPError(String description) {
+    reportError("TCP connection error: " + description);
+  }
+
+  @Override
+  public void onTCPClose() {
+    events.onChannelClose();
+  }
+
+  // --------------------------------------------------------------------
+  // Helper functions.
+  private void reportError(final String errorMessage) {
+    Log.e(TAG, errorMessage);
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        if (roomState != ConnectionState.ERROR) {
+          roomState = ConnectionState.ERROR;
+          events.onChannelError(errorMessage);
+        }
+      }
+    });
+  }
+
+  private void sendMessage(final String message) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        tcpClient.send(message);
+      }
+    });
+  }
+
+  // Put a `key`->`value` mapping in `json`.
+  private static void jsonPut(JSONObject json, String key, Object value) {
+    try {
+      json.put(key, value);
+    } catch (JSONException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  // Converts a Java candidate to a JSONObject.
+  private static JSONObject toJsonCandidate(final IceCandidate candidate) {
+    JSONObject json = new JSONObject();
+    jsonPut(json, "label", candidate.sdpMLineIndex);
+    jsonPut(json, "id", candidate.sdpMid);
+    jsonPut(json, "candidate", candidate.sdp);
+    return json;
+  }
+
+  // Converts a JSON candidate to a Java object.
+  private static IceCandidate toJavaCandidate(JSONObject json) throws JSONException {
+    return new IceCandidate(
+        json.getString("id"), json.getInt("label"), json.getString("candidate"));
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/HudFragment.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/HudFragment.java
new file mode 100644
index 0000000000..94ca05549a
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/HudFragment.java
@@ -0,0 +1,102 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.app.Fragment;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.TextView;
+import org.webrtc.RTCStats;
+import org.webrtc.RTCStatsReport;
+
+/**
+ * Fragment for HUD statistics display.
+ */
+public class HudFragment extends Fragment {
+  private TextView statView;
+  private ImageButton toggleDebugButton;
+  private boolean displayHud;
+  private volatile boolean isRunning;
+  private CpuMonitor cpuMonitor;
+
+  @Override
+  public View onCreateView(
+      LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    View controlView = inflater.inflate(R.layout.fragment_hud, container, false);
+
+    // Create UI controls.
+    statView = controlView.findViewById(R.id.hud_stat_call);
+    toggleDebugButton = controlView.findViewById(R.id.button_toggle_debug);
+
+    toggleDebugButton.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        if (displayHud) {
+          statView.setVisibility(
+              statView.getVisibility() == View.VISIBLE ? View.INVISIBLE : View.VISIBLE);
+        }
+      }
+    });
+
+    return controlView;
+  }
+
+  @Override
+  public void onStart() {
+    super.onStart();
+
+    Bundle args = getArguments();
+    if (args != null) {
+      displayHud = args.getBoolean(CallActivity.EXTRA_DISPLAY_HUD, false);
+    }
+    int visibility = displayHud ? View.VISIBLE : View.INVISIBLE;
+    statView.setVisibility(View.INVISIBLE);
+    toggleDebugButton.setVisibility(visibility);
+    isRunning = true;
+  }
+
+  @Override
+  public void onStop() {
+    isRunning = false;
+    super.onStop();
+  }
+
+  public void setCpuMonitor(CpuMonitor cpuMonitor) {
+    this.cpuMonitor = cpuMonitor;
+  }
+
+  public void updateEncoderStatistics(final RTCStatsReport report) {
+    if (!isRunning || !displayHud) {
+      return;
+    }
+
+    StringBuilder sb = new StringBuilder();
+
+    if (cpuMonitor != null) {
+      sb.append("CPU%: ")
+          .append(cpuMonitor.getCpuUsageCurrent())
+          .append("/")
+          .append(cpuMonitor.getCpuUsageAverage())
+          .append(". Freq: ")
+          .append(cpuMonitor.getFrequencyScaleAverage())
+          .append("\n");
+    }
+
+    for (RTCStats stat : report.getStatsMap().values()) {
+      sb.append(stat.toString()).append("\n");
+    }
+
+    statView.setText(sb.toString());
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
new file mode 100644
index 0000000000..398b0c3b5e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
@@ -0,0 +1,1400 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.content.Context;
+import android.os.Environment;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Date;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Locale;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.appspot.apprtc.AppRTCClient.SignalingParameters;
+import org.appspot.apprtc.RecordedAudioToFileController;
+import org.webrtc.AddIceObserver;
+import org.webrtc.AudioSource;
+import org.webrtc.AudioTrack;
+import org.webrtc.CameraVideoCapturer;
+import org.webrtc.CandidatePairChangeEvent;
+import org.webrtc.DataChannel;
+import org.webrtc.DefaultVideoDecoderFactory;
+import org.webrtc.DefaultVideoEncoderFactory;
+import org.webrtc.EglBase;
+import org.webrtc.IceCandidate;
+import org.webrtc.IceCandidateErrorEvent;
+import org.webrtc.Logging;
+import org.webrtc.MediaConstraints;
+import org.webrtc.MediaStream;
+import org.webrtc.MediaStreamTrack;
+import org.webrtc.PeerConnection;
+import org.webrtc.PeerConnection.IceConnectionState;
+import org.webrtc.PeerConnection.PeerConnectionState;
+import org.webrtc.PeerConnectionFactory;
+import org.webrtc.RTCStatsCollectorCallback;
+import org.webrtc.RTCStatsReport;
+import org.webrtc.RtpParameters;
+import org.webrtc.RtpReceiver;
+import org.webrtc.RtpSender;
+import org.webrtc.RtpTransceiver;
+import org.webrtc.SdpObserver;
+import org.webrtc.SessionDescription;
+import org.webrtc.SoftwareVideoDecoderFactory;
+import org.webrtc.SoftwareVideoEncoderFactory;
+import org.webrtc.SurfaceTextureHelper;
+import org.webrtc.VideoCapturer;
+import org.webrtc.VideoDecoderFactory;
+import org.webrtc.VideoEncoderFactory;
+import org.webrtc.VideoSink;
+import org.webrtc.VideoSource;
+import org.webrtc.VideoTrack;
+import org.webrtc.audio.AudioDeviceModule;
+import org.webrtc.audio.JavaAudioDeviceModule;
+import org.webrtc.audio.JavaAudioDeviceModule.AudioRecordErrorCallback;
+import org.webrtc.audio.JavaAudioDeviceModule.AudioRecordStateCallback;
+import org.webrtc.audio.JavaAudioDeviceModule.AudioTrackErrorCallback;
+import org.webrtc.audio.JavaAudioDeviceModule.AudioTrackStateCallback;
+
+/**
+ * Peer connection client implementation.
+ *
+ * <p>All public methods are routed to local looper thread.
+ * All PeerConnectionEvents callbacks are invoked from the same looper thread.
+ * This class is a singleton.
+ */
+public class PeerConnectionClient {
+  public static final String VIDEO_TRACK_ID = "ARDAMSv0";
+  public static final String AUDIO_TRACK_ID = "ARDAMSa0";
+  public static final String VIDEO_TRACK_TYPE = "video";
+  private static final String TAG = "PCRTCClient";
+  private static final String VIDEO_CODEC_VP8 = "VP8";
+  private static final String VIDEO_CODEC_VP9 = "VP9";
+  private static final String VIDEO_CODEC_H264 = "H264";
+  private static final String VIDEO_CODEC_H264_BASELINE = "H264 Baseline";
+  private static final String VIDEO_CODEC_H264_HIGH = "H264 High";
+  private static final String VIDEO_CODEC_AV1 = "AV1";
+  private static final String AUDIO_CODEC_OPUS = "opus";
+  private static final String AUDIO_CODEC_ISAC = "ISAC";
+  private static final String VIDEO_CODEC_PARAM_START_BITRATE = "x-google-start-bitrate";
+  private static final String VIDEO_FLEXFEC_FIELDTRIAL =
+      "WebRTC-FlexFEC-03-Advertised/Enabled/WebRTC-FlexFEC-03/Enabled/";
+  private static final String DISABLE_WEBRTC_AGC_FIELDTRIAL =
+      "WebRTC-Audio-MinimizeResamplingOnMobile/Enabled/";
+  private static final String AUDIO_CODEC_PARAM_BITRATE = "maxaveragebitrate";
+  private static final String AUDIO_ECHO_CANCELLATION_CONSTRAINT = "googEchoCancellation";
+  private static final String AUDIO_AUTO_GAIN_CONTROL_CONSTRAINT = "googAutoGainControl";
+  private static final String AUDIO_HIGH_PASS_FILTER_CONSTRAINT = "googHighpassFilter";
+  private static final String AUDIO_NOISE_SUPPRESSION_CONSTRAINT = "googNoiseSuppression";
+  private static final String DTLS_SRTP_KEY_AGREEMENT_CONSTRAINT = "DtlsSrtpKeyAgreement";
+  private static final int HD_VIDEO_WIDTH = 1280;
+  private static final int HD_VIDEO_HEIGHT = 720;
+  private static final int BPS_IN_KBPS = 1000;
+  private static final String RTCEVENTLOG_OUTPUT_DIR_NAME = "rtc_event_log";
+
+  // Executor thread is started once in private ctor and is used for all
+  // peer connection API calls to ensure new peer connection factory is
+  // created on the same thread as previously destroyed factory.
+  private static final ExecutorService executor = Executors.newSingleThreadExecutor();
+
+  private final PCObserver pcObserver = new PCObserver();
+  private final SDPObserver sdpObserver = new SDPObserver();
+  private final Timer statsTimer = new Timer();
+  private final EglBase rootEglBase;
+  private final Context appContext;
+  private final PeerConnectionParameters peerConnectionParameters;
+  private final PeerConnectionEvents events;
+
+  @Nullable
+  private PeerConnectionFactory factory;
+  @Nullable
+  private PeerConnection peerConnection;
+  @Nullable
+  private AudioSource audioSource;
+  @Nullable private SurfaceTextureHelper surfaceTextureHelper;
+  @Nullable private VideoSource videoSource;
+  private boolean preferIsac;
+  private boolean videoCapturerStopped;
+  private boolean isError;
+  @Nullable
+  private VideoSink localRender;
+  @Nullable private List<VideoSink> remoteSinks;
+  private SignalingParameters signalingParameters;
+  private int videoWidth;
+  private int videoHeight;
+  private int videoFps;
+  private MediaConstraints audioConstraints;
+  private MediaConstraints sdpMediaConstraints;
+  // Queued remote ICE candidates are consumed only after both local and
+  // remote descriptions are set. Similarly local ICE candidates are sent to
+  // remote peer after both local and remote description are set.
+  @Nullable
+  private List<IceCandidate> queuedRemoteCandidates;
+  private boolean isInitiator;
+  @Nullable private SessionDescription localDescription; // either offer or answer description
+  @Nullable
+  private VideoCapturer videoCapturer;
+  // enableVideo is set to true if video should be rendered and sent.
+  private boolean renderVideo = true;
+  @Nullable
+  private VideoTrack localVideoTrack;
+  @Nullable
+  private VideoTrack remoteVideoTrack;
+  @Nullable
+  private RtpSender localVideoSender;
+  // enableAudio is set to true if audio should be sent.
+  private boolean enableAudio = true;
+  @Nullable
+  private AudioTrack localAudioTrack;
+  @Nullable
+  private DataChannel dataChannel;
+  private final boolean dataChannelEnabled;
+  // Enable RtcEventLog.
+  @Nullable
+  private RtcEventLog rtcEventLog;
+  // Implements the WebRtcAudioRecordSamplesReadyCallback interface and writes
+  // recorded audio samples to an output file.
+  @Nullable private RecordedAudioToFileController saveRecordedAudioToFile;
+
+  /**
+   * Peer connection parameters.
+   */
+  public static class DataChannelParameters {
+    public final boolean ordered;
+    public final int maxRetransmitTimeMs;
+    public final int maxRetransmits;
+    public final String protocol;
+    public final boolean negotiated;
+    public final int id;
+
+    public DataChannelParameters(boolean ordered, int maxRetransmitTimeMs, int maxRetransmits,
+        String protocol, boolean negotiated, int id) {
+      this.ordered = ordered;
+      this.maxRetransmitTimeMs = maxRetransmitTimeMs;
+      this.maxRetransmits = maxRetransmits;
+      this.protocol = protocol;
+      this.negotiated = negotiated;
+      this.id = id;
+    }
+  }
+
+  /**
+   * Peer connection parameters.
+   */
+  public static class PeerConnectionParameters {
+    public final boolean videoCallEnabled;
+    public final boolean loopback;
+    public final boolean tracing;
+    public final int videoWidth;
+    public final int videoHeight;
+    public final int videoFps;
+    public final int videoMaxBitrate;
+    public final String videoCodec;
+    public final boolean videoCodecHwAcceleration;
+    public final boolean videoFlexfecEnabled;
+    public final int audioStartBitrate;
+    public final String audioCodec;
+    public final boolean noAudioProcessing;
+    public final boolean aecDump;
+    public final boolean saveInputAudioToFile;
+    public final boolean useOpenSLES;
+    public final boolean disableBuiltInAEC;
+    public final boolean disableBuiltInAGC;
+    public final boolean disableBuiltInNS;
+    public final boolean disableWebRtcAGCAndHPF;
+    public final boolean enableRtcEventLog;
+    private final DataChannelParameters dataChannelParameters;
+
+    public PeerConnectionParameters(boolean videoCallEnabled, boolean loopback, boolean tracing,
+        int videoWidth, int videoHeight, int videoFps, int videoMaxBitrate, String videoCodec,
+        boolean videoCodecHwAcceleration, boolean videoFlexfecEnabled, int audioStartBitrate,
+        String audioCodec, boolean noAudioProcessing, boolean aecDump, boolean saveInputAudioToFile,
+        boolean useOpenSLES, boolean disableBuiltInAEC, boolean disableBuiltInAGC,
+        boolean disableBuiltInNS, boolean disableWebRtcAGCAndHPF, boolean enableRtcEventLog,
+        DataChannelParameters dataChannelParameters) {
+      this.videoCallEnabled = videoCallEnabled;
+      this.loopback = loopback;
+      this.tracing = tracing;
+      this.videoWidth = videoWidth;
+      this.videoHeight = videoHeight;
+      this.videoFps = videoFps;
+      this.videoMaxBitrate = videoMaxBitrate;
+      this.videoCodec = videoCodec;
+      this.videoFlexfecEnabled = videoFlexfecEnabled;
+      this.videoCodecHwAcceleration = videoCodecHwAcceleration;
+      this.audioStartBitrate = audioStartBitrate;
+      this.audioCodec = audioCodec;
+      this.noAudioProcessing = noAudioProcessing;
+      this.aecDump = aecDump;
+      this.saveInputAudioToFile = saveInputAudioToFile;
+      this.useOpenSLES = useOpenSLES;
+      this.disableBuiltInAEC = disableBuiltInAEC;
+      this.disableBuiltInAGC = disableBuiltInAGC;
+      this.disableBuiltInNS = disableBuiltInNS;
+      this.disableWebRtcAGCAndHPF = disableWebRtcAGCAndHPF;
+      this.enableRtcEventLog = enableRtcEventLog;
+      this.dataChannelParameters = dataChannelParameters;
+    }
+  }
+
+  /**
+   * Peer connection events.
+   */
+  public interface PeerConnectionEvents {
+    /**
+     * Callback fired once local SDP is created and set.
+     */
+    void onLocalDescription(final SessionDescription sdp);
+
+    /**
+     * Callback fired once local Ice candidate is generated.
+     */
+    void onIceCandidate(final IceCandidate candidate);
+
+    /**
+     * Callback fired once local ICE candidates are removed.
+     */
+    void onIceCandidatesRemoved(final IceCandidate[] candidates);
+
+    /**
+     * Callback fired once connection is established (IceConnectionState is
+     * CONNECTED).
+     */
+    void onIceConnected();
+
+    /**
+     * Callback fired once connection is disconnected (IceConnectionState is
+     * DISCONNECTED).
+     */
+    void onIceDisconnected();
+
+    /**
+     * Callback fired once DTLS connection is established (PeerConnectionState
+     * is CONNECTED).
+     */
+    void onConnected();
+
+    /**
+     * Callback fired once DTLS connection is disconnected (PeerConnectionState
+     * is DISCONNECTED).
+     */
+    void onDisconnected();
+
+    /**
+     * Callback fired once peer connection is closed.
+     */
+    void onPeerConnectionClosed();
+
+    /**
+     * Callback fired once peer connection statistics is ready.
+     */
+    void onPeerConnectionStatsReady(final RTCStatsReport report);
+
+    /**
+     * Callback fired once peer connection error happened.
+     */
+    void onPeerConnectionError(final String description);
+  }
+
+  /**
+   * Create a PeerConnectionClient with the specified parameters. PeerConnectionClient takes
+   * ownership of `eglBase`.
+   */
+  public PeerConnectionClient(Context appContext, EglBase eglBase,
+      PeerConnectionParameters peerConnectionParameters, PeerConnectionEvents events) {
+    this.rootEglBase = eglBase;
+    this.appContext = appContext;
+    this.events = events;
+    this.peerConnectionParameters = peerConnectionParameters;
+    this.dataChannelEnabled = peerConnectionParameters.dataChannelParameters != null;
+
+    Log.d(TAG, "Preferred video codec: " + getSdpVideoCodecName(peerConnectionParameters));
+
+    final String fieldTrials = getFieldTrials(peerConnectionParameters);
+    executor.execute(() -> {
+      Log.d(TAG, "Initialize WebRTC. Field trials: " + fieldTrials);
+      PeerConnectionFactory.initialize(
+          PeerConnectionFactory.InitializationOptions.builder(appContext)
+              .setFieldTrials(fieldTrials)
+              .setEnableInternalTracer(true)
+              .createInitializationOptions());
+    });
+  }
+
+  /**
+   * This function should only be called once.
+   */
+  public void createPeerConnectionFactory(PeerConnectionFactory.Options options) {
+    if (factory != null) {
+      throw new IllegalStateException("PeerConnectionFactory has already been constructed");
+    }
+    executor.execute(() -> createPeerConnectionFactoryInternal(options));
+  }
+
+  public void createPeerConnection(final VideoSink localRender, final VideoSink remoteSink,
+      final VideoCapturer videoCapturer, final SignalingParameters signalingParameters) {
+    if (peerConnectionParameters.videoCallEnabled && videoCapturer == null) {
+      Log.w(TAG, "Video call enabled but no video capturer provided.");
+    }
+    createPeerConnection(
+        localRender, Collections.singletonList(remoteSink), videoCapturer, signalingParameters);
+  }
+
+  public void createPeerConnection(final VideoSink localRender, final List<VideoSink> remoteSinks,
+      final VideoCapturer videoCapturer, final SignalingParameters signalingParameters) {
+    if (peerConnectionParameters == null) {
+      Log.e(TAG, "Creating peer connection without initializing factory.");
+      return;
+    }
+    this.localRender = localRender;
+    this.remoteSinks = remoteSinks;
+    this.videoCapturer = videoCapturer;
+    this.signalingParameters = signalingParameters;
+    executor.execute(() -> {
+      try {
+        createMediaConstraintsInternal();
+        createPeerConnectionInternal();
+        maybeCreateAndStartRtcEventLog();
+      } catch (Exception e) {
+        reportError("Failed to create peer connection: " + e.getMessage());
+        throw e;
+      }
+    });
+  }
+
+  public void close() {
+    executor.execute(this ::closeInternal);
+  }
+
+  private boolean isVideoCallEnabled() {
+    return peerConnectionParameters.videoCallEnabled && videoCapturer != null;
+  }
+
+  private void createPeerConnectionFactoryInternal(PeerConnectionFactory.Options options) {
+    isError = false;
+
+    if (peerConnectionParameters.tracing) {
+      PeerConnectionFactory.startInternalTracingCapture(
+          Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator
+          + "webrtc-trace.txt");
+    }
+
+    // Check if ISAC is used by default.
+    preferIsac = peerConnectionParameters.audioCodec != null
+        && peerConnectionParameters.audioCodec.equals(AUDIO_CODEC_ISAC);
+
+    // It is possible to save a copy in raw PCM format on a file by checking
+    // the "Save input audio to file" checkbox in the Settings UI. A callback
+    // interface is set when this flag is enabled. As a result, a copy of recorded
+    // audio samples are provided to this client directly from the native audio
+    // layer in Java.
+    if (peerConnectionParameters.saveInputAudioToFile) {
+      if (!peerConnectionParameters.useOpenSLES) {
+        Log.d(TAG, "Enable recording of microphone input audio to file");
+        saveRecordedAudioToFile = new RecordedAudioToFileController(executor);
+      } else {
+        // TODO(henrika): ensure that the UI reflects that if OpenSL ES is selected,
+        // then the "Save inut audio to file" option shall be grayed out.
+        Log.e(TAG, "Recording of input audio is not supported for OpenSL ES");
+      }
+    }
+
+    final AudioDeviceModule adm = createJavaAudioDevice();
+
+    // Create peer connection factory.
+    if (options != null) {
+      Log.d(TAG, "Factory networkIgnoreMask option: " + options.networkIgnoreMask);
+    }
+    final boolean enableH264HighProfile =
+        VIDEO_CODEC_H264_HIGH.equals(peerConnectionParameters.videoCodec);
+    final VideoEncoderFactory encoderFactory;
+    final VideoDecoderFactory decoderFactory;
+
+    if (peerConnectionParameters.videoCodecHwAcceleration) {
+      encoderFactory = new DefaultVideoEncoderFactory(
+          rootEglBase.getEglBaseContext(), true /* enableIntelVp8Encoder */, enableH264HighProfile);
+      decoderFactory = new DefaultVideoDecoderFactory(rootEglBase.getEglBaseContext());
+    } else {
+      encoderFactory = new SoftwareVideoEncoderFactory();
+      decoderFactory = new SoftwareVideoDecoderFactory();
+    }
+
+    // Disable encryption for loopback calls.
+    if (peerConnectionParameters.loopback) {
+      options.disableEncryption = true;
+    }
+    factory = PeerConnectionFactory.builder()
+                  .setOptions(options)
+                  .setAudioDeviceModule(adm)
+                  .setVideoEncoderFactory(encoderFactory)
+                  .setVideoDecoderFactory(decoderFactory)
+                  .createPeerConnectionFactory();
+    Log.d(TAG, "Peer connection factory created.");
+    adm.release();
+  }
+
+  AudioDeviceModule createJavaAudioDevice() {
+    // Enable/disable OpenSL ES playback.
+    if (!peerConnectionParameters.useOpenSLES) {
+      Log.w(TAG, "External OpenSLES ADM not implemented yet.");
+      // TODO(magjed): Add support for external OpenSLES ADM.
+    }
+
+    // Set audio record error callbacks.
+    AudioRecordErrorCallback audioRecordErrorCallback = new AudioRecordErrorCallback() {
+      @Override
+      public void onWebRtcAudioRecordInitError(String errorMessage) {
+        Log.e(TAG, "onWebRtcAudioRecordInitError: " + errorMessage);
+        reportError(errorMessage);
+      }
+
+      @Override
+      public void onWebRtcAudioRecordStartError(
+          JavaAudioDeviceModule.AudioRecordStartErrorCode errorCode, String errorMessage) {
+        Log.e(TAG, "onWebRtcAudioRecordStartError: " + errorCode + ". " + errorMessage);
+        reportError(errorMessage);
+      }
+
+      @Override
+      public void onWebRtcAudioRecordError(String errorMessage) {
+        Log.e(TAG, "onWebRtcAudioRecordError: " + errorMessage);
+        reportError(errorMessage);
+      }
+    };
+
+    AudioTrackErrorCallback audioTrackErrorCallback = new AudioTrackErrorCallback() {
+      @Override
+      public void onWebRtcAudioTrackInitError(String errorMessage) {
+        Log.e(TAG, "onWebRtcAudioTrackInitError: " + errorMessage);
+        reportError(errorMessage);
+      }
+
+      @Override
+      public void onWebRtcAudioTrackStartError(
+          JavaAudioDeviceModule.AudioTrackStartErrorCode errorCode, String errorMessage) {
+        Log.e(TAG, "onWebRtcAudioTrackStartError: " + errorCode + ". " + errorMessage);
+        reportError(errorMessage);
+      }
+
+      @Override
+      public void onWebRtcAudioTrackError(String errorMessage) {
+        Log.e(TAG, "onWebRtcAudioTrackError: " + errorMessage);
+        reportError(errorMessage);
+      }
+    };
+
+    // Set audio record state callbacks.
+    AudioRecordStateCallback audioRecordStateCallback = new AudioRecordStateCallback() {
+      @Override
+      public void onWebRtcAudioRecordStart() {
+        Log.i(TAG, "Audio recording starts");
+      }
+
+      @Override
+      public void onWebRtcAudioRecordStop() {
+        Log.i(TAG, "Audio recording stops");
+      }
+    };
+
+    // Set audio track state callbacks.
+    AudioTrackStateCallback audioTrackStateCallback = new AudioTrackStateCallback() {
+      @Override
+      public void onWebRtcAudioTrackStart() {
+        Log.i(TAG, "Audio playout starts");
+      }
+
+      @Override
+      public void onWebRtcAudioTrackStop() {
+        Log.i(TAG, "Audio playout stops");
+      }
+    };
+
+    return JavaAudioDeviceModule.builder(appContext)
+        .setSamplesReadyCallback(saveRecordedAudioToFile)
+        .setUseHardwareAcousticEchoCanceler(!peerConnectionParameters.disableBuiltInAEC)
+        .setUseHardwareNoiseSuppressor(!peerConnectionParameters.disableBuiltInNS)
+        .setAudioRecordErrorCallback(audioRecordErrorCallback)
+        .setAudioTrackErrorCallback(audioTrackErrorCallback)
+        .setAudioRecordStateCallback(audioRecordStateCallback)
+        .setAudioTrackStateCallback(audioTrackStateCallback)
+        .createAudioDeviceModule();
+  }
+
+  private void createMediaConstraintsInternal() {
+    // Create video constraints if video call is enabled.
+    if (isVideoCallEnabled()) {
+      videoWidth = peerConnectionParameters.videoWidth;
+      videoHeight = peerConnectionParameters.videoHeight;
+      videoFps = peerConnectionParameters.videoFps;
+
+      // If video resolution is not specified, default to HD.
+      if (videoWidth == 0 || videoHeight == 0) {
+        videoWidth = HD_VIDEO_WIDTH;
+        videoHeight = HD_VIDEO_HEIGHT;
+      }
+
+      // If fps is not specified, default to 30.
+      if (videoFps == 0) {
+        videoFps = 30;
+      }
+      Logging.d(TAG, "Capturing format: " + videoWidth + "x" + videoHeight + "@" + videoFps);
+    }
+
+    // Create audio constraints.
+    audioConstraints = new MediaConstraints();
+    // added for audio performance measurements
+    if (peerConnectionParameters.noAudioProcessing) {
+      Log.d(TAG, "Disabling audio processing");
+      audioConstraints.mandatory.add(
+          new MediaConstraints.KeyValuePair(AUDIO_ECHO_CANCELLATION_CONSTRAINT, "false"));
+      audioConstraints.mandatory.add(
+          new MediaConstraints.KeyValuePair(AUDIO_AUTO_GAIN_CONTROL_CONSTRAINT, "false"));
+      audioConstraints.mandatory.add(
+          new MediaConstraints.KeyValuePair(AUDIO_HIGH_PASS_FILTER_CONSTRAINT, "false"));
+      audioConstraints.mandatory.add(
+          new MediaConstraints.KeyValuePair(AUDIO_NOISE_SUPPRESSION_CONSTRAINT, "false"));
+    }
+    // Create SDP constraints.
+    sdpMediaConstraints = new MediaConstraints();
+    sdpMediaConstraints.mandatory.add(
+        new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true"));
+    sdpMediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair(
+        "OfferToReceiveVideo", Boolean.toString(isVideoCallEnabled())));
+  }
+
+  private void createPeerConnectionInternal() {
+    if (factory == null || isError) {
+      Log.e(TAG, "Peerconnection factory is not created");
+      return;
+    }
+    Log.d(TAG, "Create peer connection.");
+
+    queuedRemoteCandidates = new ArrayList<>();
+
+    PeerConnection.RTCConfiguration rtcConfig =
+        new PeerConnection.RTCConfiguration(signalingParameters.iceServers);
+    // TCP candidates are only useful when connecting to a server that supports
+    // ICE-TCP.
+    rtcConfig.tcpCandidatePolicy = PeerConnection.TcpCandidatePolicy.DISABLED;
+    rtcConfig.bundlePolicy = PeerConnection.BundlePolicy.MAXBUNDLE;
+    rtcConfig.rtcpMuxPolicy = PeerConnection.RtcpMuxPolicy.REQUIRE;
+    rtcConfig.continualGatheringPolicy = PeerConnection.ContinualGatheringPolicy.GATHER_CONTINUALLY;
+    // Use ECDSA encryption.
+    rtcConfig.keyType = PeerConnection.KeyType.ECDSA;
+    rtcConfig.sdpSemantics = PeerConnection.SdpSemantics.UNIFIED_PLAN;
+
+    peerConnection = factory.createPeerConnection(rtcConfig, pcObserver);
+
+    if (dataChannelEnabled) {
+      DataChannel.Init init = new DataChannel.Init();
+      init.ordered = peerConnectionParameters.dataChannelParameters.ordered;
+      init.negotiated = peerConnectionParameters.dataChannelParameters.negotiated;
+      init.maxRetransmits = peerConnectionParameters.dataChannelParameters.maxRetransmits;
+      init.maxRetransmitTimeMs = peerConnectionParameters.dataChannelParameters.maxRetransmitTimeMs;
+      init.id = peerConnectionParameters.dataChannelParameters.id;
+      init.protocol = peerConnectionParameters.dataChannelParameters.protocol;
+      dataChannel = peerConnection.createDataChannel("ApprtcDemo data", init);
+    }
+    isInitiator = false;
+
+    // Set INFO libjingle logging.
+    // NOTE: this _must_ happen while `factory` is alive!
+    Logging.enableLogToDebugOutput(Logging.Severity.LS_INFO);
+
+    List<String> mediaStreamLabels = Collections.singletonList("ARDAMS");
+    if (isVideoCallEnabled()) {
+      peerConnection.addTrack(createVideoTrack(videoCapturer), mediaStreamLabels);
+      // We can add the renderers right away because we don't need to wait for an
+      // answer to get the remote track.
+      remoteVideoTrack = getRemoteVideoTrack();
+      remoteVideoTrack.setEnabled(renderVideo);
+      for (VideoSink remoteSink : remoteSinks) {
+        remoteVideoTrack.addSink(remoteSink);
+      }
+    }
+    peerConnection.addTrack(createAudioTrack(), mediaStreamLabels);
+    if (isVideoCallEnabled()) {
+      findVideoSender();
+    }
+
+    if (peerConnectionParameters.aecDump) {
+      try {
+        ParcelFileDescriptor aecDumpFileDescriptor =
+            ParcelFileDescriptor.open(new File(Environment.getExternalStorageDirectory().getPath()
+                                          + File.separator + "Download/audio.aecdump"),
+                ParcelFileDescriptor.MODE_READ_WRITE | ParcelFileDescriptor.MODE_CREATE
+                    | ParcelFileDescriptor.MODE_TRUNCATE);
+        factory.startAecDump(aecDumpFileDescriptor.detachFd(), -1);
+      } catch (IOException e) {
+        Log.e(TAG, "Can not open aecdump file", e);
+      }
+    }
+
+    if (saveRecordedAudioToFile != null) {
+      if (saveRecordedAudioToFile.start()) {
+        Log.d(TAG, "Recording input audio to file is activated");
+      }
+    }
+    Log.d(TAG, "Peer connection created.");
+  }
+
+  private File createRtcEventLogOutputFile() {
+    DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_hhmm_ss", Locale.getDefault());
+    Date date = new Date();
+    final String outputFileName = "event_log_" + dateFormat.format(date) + ".log";
+    return new File(
+        appContext.getDir(RTCEVENTLOG_OUTPUT_DIR_NAME, Context.MODE_PRIVATE), outputFileName);
+  }
+
+  private void maybeCreateAndStartRtcEventLog() {
+    if (appContext == null || peerConnection == null) {
+      return;
+    }
+    if (!peerConnectionParameters.enableRtcEventLog) {
+      Log.d(TAG, "RtcEventLog is disabled.");
+      return;
+    }
+    rtcEventLog = new RtcEventLog(peerConnection);
+    rtcEventLog.start(createRtcEventLogOutputFile());
+  }
+
+  private void closeInternal() {
+    if (factory != null && peerConnectionParameters.aecDump) {
+      factory.stopAecDump();
+    }
+    Log.d(TAG, "Closing peer connection.");
+    statsTimer.cancel();
+    if (dataChannel != null) {
+      dataChannel.dispose();
+      dataChannel = null;
+    }
+    if (rtcEventLog != null) {
+      // RtcEventLog should stop before the peer connection is disposed.
+      rtcEventLog.stop();
+      rtcEventLog = null;
+    }
+    if (peerConnection != null) {
+      peerConnection.dispose();
+      peerConnection = null;
+    }
+    Log.d(TAG, "Closing audio source.");
+    if (audioSource != null) {
+      audioSource.dispose();
+      audioSource = null;
+    }
+    Log.d(TAG, "Stopping capture.");
+    if (videoCapturer != null) {
+      try {
+        videoCapturer.stopCapture();
+      } catch (InterruptedException e) {
+        throw new RuntimeException(e);
+      }
+      videoCapturerStopped = true;
+      videoCapturer.dispose();
+      videoCapturer = null;
+    }
+    Log.d(TAG, "Closing video source.");
+    if (videoSource != null) {
+      videoSource.dispose();
+      videoSource = null;
+    }
+    if (surfaceTextureHelper != null) {
+      surfaceTextureHelper.dispose();
+      surfaceTextureHelper = null;
+    }
+    if (saveRecordedAudioToFile != null) {
+      Log.d(TAG, "Closing audio file for recorded input audio.");
+      saveRecordedAudioToFile.stop();
+      saveRecordedAudioToFile = null;
+    }
+    localRender = null;
+    remoteSinks = null;
+    Log.d(TAG, "Closing peer connection factory.");
+    if (factory != null) {
+      factory.dispose();
+      factory = null;
+    }
+    rootEglBase.release();
+    Log.d(TAG, "Closing peer connection done.");
+    events.onPeerConnectionClosed();
+    PeerConnectionFactory.stopInternalTracingCapture();
+    PeerConnectionFactory.shutdownInternalTracer();
+  }
+
+  public boolean isHDVideo() {
+    return isVideoCallEnabled() && videoWidth * videoHeight >= 1280 * 720;
+  }
+
+  private void getStats() {
+    if (peerConnection == null || isError) {
+      return;
+    }
+    peerConnection.getStats(new RTCStatsCollectorCallback() {
+      @Override
+      public void onStatsDelivered(RTCStatsReport report) {
+        events.onPeerConnectionStatsReady(report);
+      }
+    });
+  }
+
+  public void enableStatsEvents(boolean enable, int periodMs) {
+    if (enable) {
+      try {
+        statsTimer.schedule(new TimerTask() {
+          @Override
+          public void run() {
+            executor.execute(() -> getStats());
+          }
+        }, 0, periodMs);
+      } catch (Exception e) {
+        Log.e(TAG, "Can not schedule statistics timer", e);
+      }
+    } else {
+      statsTimer.cancel();
+    }
+  }
+
+  public void setAudioEnabled(final boolean enable) {
+    executor.execute(() -> {
+      enableAudio = enable;
+      if (localAudioTrack != null) {
+        localAudioTrack.setEnabled(enableAudio);
+      }
+    });
+  }
+
+  public void setVideoEnabled(final boolean enable) {
+    executor.execute(() -> {
+      renderVideo = enable;
+      if (localVideoTrack != null) {
+        localVideoTrack.setEnabled(renderVideo);
+      }
+      if (remoteVideoTrack != null) {
+        remoteVideoTrack.setEnabled(renderVideo);
+      }
+    });
+  }
+
+  public void createOffer() {
+    executor.execute(() -> {
+      if (peerConnection != null && !isError) {
+        Log.d(TAG, "PC Create OFFER");
+        isInitiator = true;
+        peerConnection.createOffer(sdpObserver, sdpMediaConstraints);
+      }
+    });
+  }
+
+  public void createAnswer() {
+    executor.execute(() -> {
+      if (peerConnection != null && !isError) {
+        Log.d(TAG, "PC create ANSWER");
+        isInitiator = false;
+        peerConnection.createAnswer(sdpObserver, sdpMediaConstraints);
+      }
+    });
+  }
+
+  public void addRemoteIceCandidate(final IceCandidate candidate) {
+    executor.execute(() -> {
+      if (peerConnection != null && !isError) {
+        if (queuedRemoteCandidates != null) {
+          queuedRemoteCandidates.add(candidate);
+        } else {
+          peerConnection.addIceCandidate(candidate, new AddIceObserver() {
+            @Override
+            public void onAddSuccess() {
+              Log.d(TAG, "Candidate " + candidate + " successfully added.");
+            }
+            @Override
+            public void onAddFailure(String error) {
+              Log.d(TAG, "Candidate " + candidate + " addition failed: " + error);
+            }
+          });
+        }
+      }
+    });
+  }
+
+  public void removeRemoteIceCandidates(final IceCandidate[] candidates) {
+    executor.execute(() -> {
+      if (peerConnection == null || isError) {
+        return;
+      }
+      // Drain the queued remote candidates if there is any so that
+      // they are processed in the proper order.
+      drainCandidates();
+      peerConnection.removeIceCandidates(candidates);
+    });
+  }
+
+  public void setRemoteDescription(final SessionDescription desc) {
+    executor.execute(() -> {
+      if (peerConnection == null || isError) {
+        return;
+      }
+      String sdp = desc.description;
+      if (preferIsac) {
+        sdp = preferCodec(sdp, AUDIO_CODEC_ISAC, true);
+      }
+      if (isVideoCallEnabled()) {
+        sdp = preferCodec(sdp, getSdpVideoCodecName(peerConnectionParameters), false);
+      }
+      if (peerConnectionParameters.audioStartBitrate > 0) {
+        sdp = setStartBitrate(
+            AUDIO_CODEC_OPUS, false, sdp, peerConnectionParameters.audioStartBitrate);
+      }
+      Log.d(TAG, "Set remote SDP.");
+      SessionDescription sdpRemote = new SessionDescription(desc.type, sdp);
+      peerConnection.setRemoteDescription(sdpObserver, sdpRemote);
+    });
+  }
+
+  public void stopVideoSource() {
+    executor.execute(() -> {
+      if (videoCapturer != null && !videoCapturerStopped) {
+        Log.d(TAG, "Stop video source.");
+        try {
+          videoCapturer.stopCapture();
+        } catch (InterruptedException e) {
+        }
+        videoCapturerStopped = true;
+      }
+    });
+  }
+
+  public void startVideoSource() {
+    executor.execute(() -> {
+      if (videoCapturer != null && videoCapturerStopped) {
+        Log.d(TAG, "Restart video source.");
+        videoCapturer.startCapture(videoWidth, videoHeight, videoFps);
+        videoCapturerStopped = false;
+      }
+    });
+  }
+
+  public void setVideoMaxBitrate(@Nullable final Integer maxBitrateKbps) {
+    executor.execute(() -> {
+      if (peerConnection == null || localVideoSender == null || isError) {
+        return;
+      }
+      Log.d(TAG, "Requested max video bitrate: " + maxBitrateKbps);
+      if (localVideoSender == null) {
+        Log.w(TAG, "Sender is not ready.");
+        return;
+      }
+
+      RtpParameters parameters = localVideoSender.getParameters();
+      if (parameters.encodings.size() == 0) {
+        Log.w(TAG, "RtpParameters are not ready.");
+        return;
+      }
+
+      for (RtpParameters.Encoding encoding : parameters.encodings) {
+        // Null value means no limit.
+        encoding.maxBitrateBps = maxBitrateKbps == null ? null : maxBitrateKbps * BPS_IN_KBPS;
+      }
+      if (!localVideoSender.setParameters(parameters)) {
+        Log.e(TAG, "RtpSender.setParameters failed.");
+      }
+      Log.d(TAG, "Configured max video bitrate to: " + maxBitrateKbps);
+    });
+  }
+
+  private void reportError(final String errorMessage) {
+    Log.e(TAG, "Peerconnection error: " + errorMessage);
+    executor.execute(() -> {
+      if (!isError) {
+        events.onPeerConnectionError(errorMessage);
+        isError = true;
+      }
+    });
+  }
+
+  @Nullable
+  private AudioTrack createAudioTrack() {
+    audioSource = factory.createAudioSource(audioConstraints);
+    localAudioTrack = factory.createAudioTrack(AUDIO_TRACK_ID, audioSource);
+    localAudioTrack.setEnabled(enableAudio);
+    return localAudioTrack;
+  }
+
+  @Nullable
+  private VideoTrack createVideoTrack(VideoCapturer capturer) {
+    surfaceTextureHelper =
+        SurfaceTextureHelper.create("CaptureThread", rootEglBase.getEglBaseContext());
+    videoSource = factory.createVideoSource(capturer.isScreencast());
+    capturer.initialize(surfaceTextureHelper, appContext, videoSource.getCapturerObserver());
+    capturer.startCapture(videoWidth, videoHeight, videoFps);
+
+    localVideoTrack = factory.createVideoTrack(VIDEO_TRACK_ID, videoSource);
+    localVideoTrack.setEnabled(renderVideo);
+    localVideoTrack.addSink(localRender);
+    return localVideoTrack;
+  }
+
+  private void findVideoSender() {
+    for (RtpSender sender : peerConnection.getSenders()) {
+      if (sender.track() != null) {
+        String trackType = sender.track().kind();
+        if (trackType.equals(VIDEO_TRACK_TYPE)) {
+          Log.d(TAG, "Found video sender.");
+          localVideoSender = sender;
+        }
+      }
+    }
+  }
+
+  // Returns the remote VideoTrack, assuming there is only one.
+  private @Nullable VideoTrack getRemoteVideoTrack() {
+    for (RtpTransceiver transceiver : peerConnection.getTransceivers()) {
+      MediaStreamTrack track = transceiver.getReceiver().track();
+      if (track instanceof VideoTrack) {
+        return (VideoTrack) track;
+      }
+    }
+    return null;
+  }
+
+  private static String getSdpVideoCodecName(PeerConnectionParameters parameters) {
+    switch (parameters.videoCodec) {
+      case VIDEO_CODEC_VP8:
+        return VIDEO_CODEC_VP8;
+      case VIDEO_CODEC_VP9:
+        return VIDEO_CODEC_VP9;
+      case VIDEO_CODEC_AV1:
+        return VIDEO_CODEC_AV1;
+      case VIDEO_CODEC_H264_HIGH:
+      case VIDEO_CODEC_H264_BASELINE:
+        return VIDEO_CODEC_H264;
+      default:
+        return VIDEO_CODEC_VP8;
+    }
+  }
+
+  private static String getFieldTrials(PeerConnectionParameters peerConnectionParameters) {
+    String fieldTrials = "";
+    if (peerConnectionParameters.videoFlexfecEnabled) {
+      fieldTrials += VIDEO_FLEXFEC_FIELDTRIAL;
+      Log.d(TAG, "Enable FlexFEC field trial.");
+    }
+    if (peerConnectionParameters.disableWebRtcAGCAndHPF) {
+      fieldTrials += DISABLE_WEBRTC_AGC_FIELDTRIAL;
+      Log.d(TAG, "Disable WebRTC AGC field trial.");
+    }
+    return fieldTrials;
+  }
+
+  @SuppressWarnings("StringSplitter")
+  private static String setStartBitrate(
+      String codec, boolean isVideoCodec, String sdp, int bitrateKbps) {
+    String[] lines = sdp.split("\r\n");
+    int rtpmapLineIndex = -1;
+    boolean sdpFormatUpdated = false;
+    String codecRtpMap = null;
+    // Search for codec rtpmap in format
+    // a=rtpmap:<payload type> <encoding name>/<clock rate> [/<encoding parameters>]
+    String regex = "^a=rtpmap:(\\d+) " + codec + "(/\\d+)+[\r]?$";
+    Pattern codecPattern = Pattern.compile(regex);
+    for (int i = 0; i < lines.length; i++) {
+      Matcher codecMatcher = codecPattern.matcher(lines[i]);
+      if (codecMatcher.matches()) {
+        codecRtpMap = codecMatcher.group(1);
+        rtpmapLineIndex = i;
+        break;
+      }
+    }
+    if (codecRtpMap == null) {
+      Log.w(TAG, "No rtpmap for " + codec + " codec");
+      return sdp;
+    }
+    Log.d(TAG, "Found " + codec + " rtpmap " + codecRtpMap + " at " + lines[rtpmapLineIndex]);
+
+    // Check if a=fmtp string already exist in remote SDP for this codec and
+    // update it with new bitrate parameter.
+    regex = "^a=fmtp:" + codecRtpMap + " \\w+=\\d+.*[\r]?$";
+    codecPattern = Pattern.compile(regex);
+    for (int i = 0; i < lines.length; i++) {
+      Matcher codecMatcher = codecPattern.matcher(lines[i]);
+      if (codecMatcher.matches()) {
+        Log.d(TAG, "Found " + codec + " " + lines[i]);
+        if (isVideoCodec) {
+          lines[i] += "; " + VIDEO_CODEC_PARAM_START_BITRATE + "=" + bitrateKbps;
+        } else {
+          lines[i] += "; " + AUDIO_CODEC_PARAM_BITRATE + "=" + (bitrateKbps * 1000);
+        }
+        Log.d(TAG, "Update remote SDP line: " + lines[i]);
+        sdpFormatUpdated = true;
+        break;
+      }
+    }
+
+    StringBuilder newSdpDescription = new StringBuilder();
+    for (int i = 0; i < lines.length; i++) {
+      newSdpDescription.append(lines[i]).append("\r\n");
+      // Append new a=fmtp line if no such line exist for a codec.
+      if (!sdpFormatUpdated && i == rtpmapLineIndex) {
+        String bitrateSet;
+        if (isVideoCodec) {
+          bitrateSet =
+              "a=fmtp:" + codecRtpMap + " " + VIDEO_CODEC_PARAM_START_BITRATE + "=" + bitrateKbps;
+        } else {
+          bitrateSet = "a=fmtp:" + codecRtpMap + " " + AUDIO_CODEC_PARAM_BITRATE + "="
+              + (bitrateKbps * 1000);
+        }
+        Log.d(TAG, "Add remote SDP line: " + bitrateSet);
+        newSdpDescription.append(bitrateSet).append("\r\n");
+      }
+    }
+    return newSdpDescription.toString();
+  }
+
+  /** Returns the line number containing "m=audio|video", or -1 if no such line exists. */
+  private static int findMediaDescriptionLine(boolean isAudio, String[] sdpLines) {
+    final String mediaDescription = isAudio ? "m=audio " : "m=video ";
+    for (int i = 0; i < sdpLines.length; ++i) {
+      if (sdpLines[i].startsWith(mediaDescription)) {
+        return i;
+      }
+    }
+    return -1;
+  }
+
+  private static String joinString(
+      Iterable<? extends CharSequence> s, String delimiter, boolean delimiterAtEnd) {
+    Iterator<? extends CharSequence> iter = s.iterator();
+    if (!iter.hasNext()) {
+      return "";
+    }
+    StringBuilder buffer = new StringBuilder(iter.next());
+    while (iter.hasNext()) {
+      buffer.append(delimiter).append(iter.next());
+    }
+    if (delimiterAtEnd) {
+      buffer.append(delimiter);
+    }
+    return buffer.toString();
+  }
+
+  private static @Nullable String movePayloadTypesToFront(
+      List<String> preferredPayloadTypes, String mLine) {
+    // The format of the media description line should be: m=<media> <port> <proto> <fmt> ...
+    final List<String> origLineParts = Arrays.asList(mLine.split(" "));
+    if (origLineParts.size() <= 3) {
+      Log.e(TAG, "Wrong SDP media description format: " + mLine);
+      return null;
+    }
+    final List<String> header = origLineParts.subList(0, 3);
+    final List<String> unpreferredPayloadTypes =
+        new ArrayList<>(origLineParts.subList(3, origLineParts.size()));
+    unpreferredPayloadTypes.removeAll(preferredPayloadTypes);
+    // Reconstruct the line with `preferredPayloadTypes` moved to the beginning of the payload
+    // types.
+    final List<String> newLineParts = new ArrayList<>();
+    newLineParts.addAll(header);
+    newLineParts.addAll(preferredPayloadTypes);
+    newLineParts.addAll(unpreferredPayloadTypes);
+    return joinString(newLineParts, " ", false /* delimiterAtEnd */);
+  }
+
+  private static String preferCodec(String sdp, String codec, boolean isAudio) {
+    final String[] lines = sdp.split("\r\n");
+    final int mLineIndex = findMediaDescriptionLine(isAudio, lines);
+    if (mLineIndex == -1) {
+      Log.w(TAG, "No mediaDescription line, so can't prefer " + codec);
+      return sdp;
+    }
+    // A list with all the payload types with name `codec`. The payload types are integers in the
+    // range 96-127, but they are stored as strings here.
+    final List<String> codecPayloadTypes = new ArrayList<>();
+    // a=rtpmap:<payload type> <encoding name>/<clock rate> [/<encoding parameters>]
+    final Pattern codecPattern = Pattern.compile("^a=rtpmap:(\\d+) " + codec + "(/\\d+)+[\r]?$");
+    for (String line : lines) {
+      Matcher codecMatcher = codecPattern.matcher(line);
+      if (codecMatcher.matches()) {
+        codecPayloadTypes.add(codecMatcher.group(1));
+      }
+    }
+    if (codecPayloadTypes.isEmpty()) {
+      Log.w(TAG, "No payload types with name " + codec);
+      return sdp;
+    }
+
+    final String newMLine = movePayloadTypesToFront(codecPayloadTypes, lines[mLineIndex]);
+    if (newMLine == null) {
+      return sdp;
+    }
+    Log.d(TAG, "Change media description from: " + lines[mLineIndex] + " to " + newMLine);
+    lines[mLineIndex] = newMLine;
+    return joinString(Arrays.asList(lines), "\r\n", true /* delimiterAtEnd */);
+  }
+
+  private void drainCandidates() {
+    if (queuedRemoteCandidates != null) {
+      Log.d(TAG, "Add " + queuedRemoteCandidates.size() + " remote candidates");
+      for (IceCandidate candidate : queuedRemoteCandidates) {
+        peerConnection.addIceCandidate(candidate, new AddIceObserver() {
+          @Override
+          public void onAddSuccess() {
+            Log.d(TAG, "Candidate " + candidate + " successfully added.");
+          }
+          @Override
+          public void onAddFailure(String error) {
+            Log.d(TAG, "Candidate " + candidate + " addition failed: " + error);
+          }
+        });
+      }
+      queuedRemoteCandidates = null;
+    }
+  }
+
+  private void switchCameraInternal() {
+    if (videoCapturer instanceof CameraVideoCapturer) {
+      if (!isVideoCallEnabled() || isError) {
+        Log.e(TAG,
+            "Failed to switch camera. Video: " + isVideoCallEnabled() + ". Error : " + isError);
+        return; // No video is sent or only one camera is available or error happened.
+      }
+      Log.d(TAG, "Switch camera");
+      CameraVideoCapturer cameraVideoCapturer = (CameraVideoCapturer) videoCapturer;
+      cameraVideoCapturer.switchCamera(null);
+    } else {
+      Log.d(TAG, "Will not switch camera, video caputurer is not a camera");
+    }
+  }
+
+  public void switchCamera() {
+    executor.execute(this ::switchCameraInternal);
+  }
+
+  public void changeCaptureFormat(final int width, final int height, final int framerate) {
+    executor.execute(() -> changeCaptureFormatInternal(width, height, framerate));
+  }
+
+  private void changeCaptureFormatInternal(int width, int height, int framerate) {
+    if (!isVideoCallEnabled() || isError || videoCapturer == null) {
+      Log.e(TAG,
+          "Failed to change capture format. Video: " + isVideoCallEnabled()
+              + ". Error : " + isError);
+      return;
+    }
+    Log.d(TAG, "changeCaptureFormat: " + width + "x" + height + "@" + framerate);
+    videoSource.adaptOutputFormat(width, height, framerate);
+  }
+
+  // Implementation detail: observe ICE & stream changes and react accordingly.
+  private class PCObserver implements PeerConnection.Observer {
+    @Override
+    public void onIceCandidate(final IceCandidate candidate) {
+      executor.execute(() -> events.onIceCandidate(candidate));
+    }
+
+    @Override
+    public void onIceCandidateError(final IceCandidateErrorEvent event) {
+      Log.d(TAG,
+          "IceCandidateError address: " + event.address + ", port: " + event.port + ", url: "
+              + event.url + ", errorCode: " + event.errorCode + ", errorText: " + event.errorText);
+    }
+
+    @Override
+    public void onIceCandidatesRemoved(final IceCandidate[] candidates) {
+      executor.execute(() -> events.onIceCandidatesRemoved(candidates));
+    }
+
+    @Override
+    public void onSignalingChange(PeerConnection.SignalingState newState) {
+      Log.d(TAG, "SignalingState: " + newState);
+    }
+
+    @Override
+    public void onIceConnectionChange(final PeerConnection.IceConnectionState newState) {
+      executor.execute(() -> {
+        Log.d(TAG, "IceConnectionState: " + newState);
+        if (newState == IceConnectionState.CONNECTED) {
+          events.onIceConnected();
+        } else if (newState == IceConnectionState.DISCONNECTED) {
+          events.onIceDisconnected();
+        } else if (newState == IceConnectionState.FAILED) {
+          reportError("ICE connection failed.");
+        }
+      });
+    }
+
+    @Override
+    public void onConnectionChange(final PeerConnection.PeerConnectionState newState) {
+      executor.execute(() -> {
+        Log.d(TAG, "PeerConnectionState: " + newState);
+        if (newState == PeerConnectionState.CONNECTED) {
+          events.onConnected();
+        } else if (newState == PeerConnectionState.DISCONNECTED) {
+          events.onDisconnected();
+        } else if (newState == PeerConnectionState.FAILED) {
+          reportError("DTLS connection failed.");
+        }
+      });
+    }
+
+    @Override
+    public void onIceGatheringChange(PeerConnection.IceGatheringState newState) {
+      Log.d(TAG, "IceGatheringState: " + newState);
+    }
+
+    @Override
+    public void onIceConnectionReceivingChange(boolean receiving) {
+      Log.d(TAG, "IceConnectionReceiving changed to " + receiving);
+    }
+
+    @Override
+    public void onSelectedCandidatePairChanged(CandidatePairChangeEvent event) {
+      Log.d(TAG, "Selected candidate pair changed because: " + event);
+    }
+
+    @Override
+    public void onAddStream(final MediaStream stream) {}
+
+    @Override
+    public void onRemoveStream(final MediaStream stream) {}
+
+    @Override
+    public void onDataChannel(final DataChannel dc) {
+      Log.d(TAG, "New Data channel " + dc.label());
+
+      if (!dataChannelEnabled)
+        return;
+
+      dc.registerObserver(new DataChannel.Observer() {
+        @Override
+        public void onBufferedAmountChange(long previousAmount) {
+          Log.d(TAG, "Data channel buffered amount changed: " + dc.label() + ": " + dc.state());
+        }
+
+        @Override
+        public void onStateChange() {
+          Log.d(TAG, "Data channel state changed: " + dc.label() + ": " + dc.state());
+        }
+
+        @Override
+        public void onMessage(final DataChannel.Buffer buffer) {
+          if (buffer.binary) {
+            Log.d(TAG, "Received binary msg over " + dc);
+            return;
+          }
+          ByteBuffer data = buffer.data;
+          final byte[] bytes = new byte[data.capacity()];
+          data.get(bytes);
+          String strData = new String(bytes, Charset.forName("UTF-8"));
+          Log.d(TAG, "Got msg: " + strData + " over " + dc);
+        }
+      });
+    }
+
+    @Override
+    public void onRenegotiationNeeded() {
+      // No need to do anything; AppRTC follows a pre-agreed-upon
+      // signaling/negotiation protocol.
+    }
+
+    @Override
+    public void onAddTrack(final RtpReceiver receiver, final MediaStream[] mediaStreams) {}
+
+    @Override
+    public void onRemoveTrack(final RtpReceiver receiver) {}
+  }
+
+  // Implementation detail: handle offer creation/signaling and answer setting,
+  // as well as adding remote ICE candidates once the answer SDP is set.
+  private class SDPObserver implements SdpObserver {
+    @Override
+    public void onCreateSuccess(final SessionDescription desc) {
+      if (localDescription != null) {
+        reportError("Multiple SDP create.");
+        return;
+      }
+      String sdp = desc.description;
+      if (preferIsac) {
+        sdp = preferCodec(sdp, AUDIO_CODEC_ISAC, true);
+      }
+      if (isVideoCallEnabled()) {
+        sdp = preferCodec(sdp, getSdpVideoCodecName(peerConnectionParameters), false);
+      }
+      final SessionDescription newDesc = new SessionDescription(desc.type, sdp);
+      localDescription = newDesc;
+      executor.execute(() -> {
+        if (peerConnection != null && !isError) {
+          Log.d(TAG, "Set local SDP from " + desc.type);
+          peerConnection.setLocalDescription(sdpObserver, newDesc);
+        }
+      });
+    }
+
+    @Override
+    public void onSetSuccess() {
+      executor.execute(() -> {
+        if (peerConnection == null || isError) {
+          return;
+        }
+        if (isInitiator) {
+          // For offering peer connection we first create offer and set
+          // local SDP, then after receiving answer set remote SDP.
+          if (peerConnection.getRemoteDescription() == null) {
+            // We've just set our local SDP so time to send it.
+            Log.d(TAG, "Local SDP set succesfully");
+            events.onLocalDescription(localDescription);
+          } else {
+            // We've just set remote description, so drain remote
+            // and send local ICE candidates.
+            Log.d(TAG, "Remote SDP set succesfully");
+            drainCandidates();
+          }
+        } else {
+          // For answering peer connection we set remote SDP and then
+          // create answer and set local SDP.
+          if (peerConnection.getLocalDescription() != null) {
+            // We've just set our local SDP so time to send it, drain
+            // remote and send local ICE candidates.
+            Log.d(TAG, "Local SDP set succesfully");
+            events.onLocalDescription(localDescription);
+            drainCandidates();
+          } else {
+            // We've just set remote SDP - do nothing for now -
+            // answer will be created soon.
+            Log.d(TAG, "Remote SDP set succesfully");
+          }
+        }
+      });
+    }
+
+    @Override
+    public void onCreateFailure(final String error) {
+      reportError("createSDP error: " + error);
+    }
+
+    @Override
+    public void onSetFailure(final String error) {
+      reportError("setSDP error: " + error);
+    }
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RecordedAudioToFileController.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RecordedAudioToFileController.java
new file mode 100644
index 0000000000..9787852feb
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RecordedAudioToFileController.java
@@ -0,0 +1,143 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.media.AudioFormat;
+import android.os.Environment;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.concurrent.ExecutorService;
+import org.webrtc.audio.JavaAudioDeviceModule;
+import org.webrtc.audio.JavaAudioDeviceModule.SamplesReadyCallback;
+
+/**
+ * Implements the AudioRecordSamplesReadyCallback interface and writes
+ * recorded raw audio samples to an output file.
+ */
+public class RecordedAudioToFileController implements SamplesReadyCallback {
+  private static final String TAG = "RecordedAudioToFile";
+  private static final long MAX_FILE_SIZE_IN_BYTES = 58348800L;
+
+  private final Object lock = new Object();
+  private final ExecutorService executor;
+  @Nullable private OutputStream rawAudioFileOutputStream;
+  private boolean isRunning;
+  private long fileSizeInBytes;
+
+  public RecordedAudioToFileController(ExecutorService executor) {
+    Log.d(TAG, "ctor");
+    this.executor = executor;
+  }
+
+  /**
+   * Should be called on the same executor thread as the one provided at
+   * construction.
+   */
+  public boolean start() {
+    Log.d(TAG, "start");
+    if (!isExternalStorageWritable()) {
+      Log.e(TAG, "Writing to external media is not possible");
+      return false;
+    }
+    synchronized (lock) {
+      isRunning = true;
+    }
+    return true;
+  }
+
+  /**
+   * Should be called on the same executor thread as the one provided at
+   * construction.
+   */
+  public void stop() {
+    Log.d(TAG, "stop");
+    synchronized (lock) {
+      isRunning = false;
+      if (rawAudioFileOutputStream != null) {
+        try {
+          rawAudioFileOutputStream.close();
+        } catch (IOException e) {
+          Log.e(TAG, "Failed to close file with saved input audio: " + e);
+        }
+        rawAudioFileOutputStream = null;
+      }
+      fileSizeInBytes = 0;
+    }
+  }
+
+  // Checks if external storage is available for read and write.
+  private boolean isExternalStorageWritable() {
+    String state = Environment.getExternalStorageState();
+    if (Environment.MEDIA_MOUNTED.equals(state)) {
+      return true;
+    }
+    return false;
+  }
+
+  // Utilizes audio parameters to create a file name which contains sufficient
+  // information so that the file can be played using an external file player.
+  // Example: /sdcard/recorded_audio_16bits_48000Hz_mono.pcm.
+  private void openRawAudioOutputFile(int sampleRate, int channelCount) {
+    final String fileName = Environment.getExternalStorageDirectory().getPath() + File.separator
+        + "recorded_audio_16bits_" + String.valueOf(sampleRate) + "Hz"
+        + ((channelCount == 1) ? "_mono" : "_stereo") + ".pcm";
+    final File outputFile = new File(fileName);
+    try {
+      rawAudioFileOutputStream = new FileOutputStream(outputFile);
+    } catch (FileNotFoundException e) {
+      Log.e(TAG, "Failed to open audio output file: " + e.getMessage());
+    }
+    Log.d(TAG, "Opened file for recording: " + fileName);
+  }
+
+  // Called when new audio samples are ready.
+  @Override
+  public void onWebRtcAudioRecordSamplesReady(JavaAudioDeviceModule.AudioSamples samples) {
+    // The native audio layer on Android should use 16-bit PCM format.
+    if (samples.getAudioFormat() != AudioFormat.ENCODING_PCM_16BIT) {
+      Log.e(TAG, "Invalid audio format");
+      return;
+    }
+    synchronized (lock) {
+      // Abort early if stop() has been called.
+      if (!isRunning) {
+        return;
+      }
+      // Open a new file for the first callback only since it allows us to add audio parameters to
+      // the file name.
+      if (rawAudioFileOutputStream == null) {
+        openRawAudioOutputFile(samples.getSampleRate(), samples.getChannelCount());
+        fileSizeInBytes = 0;
+      }
+    }
+    // Append the recorded 16-bit audio samples to the open output file.
+    executor.execute(() -> {
+      if (rawAudioFileOutputStream != null) {
+        try {
+          // Set a limit on max file size. 58348800 bytes corresponds to
+          // approximately 10 minutes of recording in mono at 48kHz.
+          if (fileSizeInBytes < MAX_FILE_SIZE_IN_BYTES) {
+            // Writes samples.getData().length bytes to output stream.
+            rawAudioFileOutputStream.write(samples.getData());
+            fileSizeInBytes += samples.getData().length;
+          }
+        } catch (IOException e) {
+          Log.e(TAG, "Failed to write audio to file: " + e.getMessage());
+        }
+      }
+    });
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RoomParametersFetcher.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RoomParametersFetcher.java
new file mode 100644
index 0000000000..6a0f235528
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RoomParametersFetcher.java
@@ -0,0 +1,226 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.util.Log;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Scanner;
+import java.util.List;
+import org.appspot.apprtc.AppRTCClient.SignalingParameters;
+import org.appspot.apprtc.util.AsyncHttpURLConnection;
+import org.appspot.apprtc.util.AsyncHttpURLConnection.AsyncHttpEvents;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.webrtc.IceCandidate;
+import org.webrtc.PeerConnection;
+import org.webrtc.SessionDescription;
+
+/**
+ * AsyncTask that converts an AppRTC room URL into the set of signaling
+ * parameters to use with that room.
+ */
+public class RoomParametersFetcher {
+  private static final String TAG = "RoomRTCClient";
+  private static final int TURN_HTTP_TIMEOUT_MS = 5000;
+  private final RoomParametersFetcherEvents events;
+  private final String roomUrl;
+  private final String roomMessage;
+
+  /**
+   * Room parameters fetcher callbacks.
+   */
+  public interface RoomParametersFetcherEvents {
+    /**
+     * Callback fired once the room's signaling parameters
+     * SignalingParameters are extracted.
+     */
+    void onSignalingParametersReady(final SignalingParameters params);
+
+    /**
+     * Callback for room parameters extraction error.
+     */
+    void onSignalingParametersError(final String description);
+  }
+
+  public RoomParametersFetcher(
+      String roomUrl, String roomMessage, final RoomParametersFetcherEvents events) {
+    this.roomUrl = roomUrl;
+    this.roomMessage = roomMessage;
+    this.events = events;
+  }
+
+  public void makeRequest() {
+    Log.d(TAG, "Connecting to room: " + roomUrl);
+    AsyncHttpURLConnection httpConnection =
+        new AsyncHttpURLConnection("POST", roomUrl, roomMessage, new AsyncHttpEvents() {
+          @Override
+          public void onHttpError(String errorMessage) {
+            Log.e(TAG, "Room connection error: " + errorMessage);
+            events.onSignalingParametersError(errorMessage);
+          }
+
+          @Override
+          public void onHttpComplete(String response) {
+            roomHttpResponseParse(response);
+          }
+        });
+    httpConnection.send();
+  }
+
+  private void roomHttpResponseParse(String response) {
+    Log.d(TAG, "Room response: " + response);
+    try {
+      List<IceCandidate> iceCandidates = null;
+      SessionDescription offerSdp = null;
+      JSONObject roomJson = new JSONObject(response);
+
+      String result = roomJson.getString("result");
+      if (!result.equals("SUCCESS")) {
+        events.onSignalingParametersError("Room response error: " + result);
+        return;
+      }
+      response = roomJson.getString("params");
+      roomJson = new JSONObject(response);
+      String roomId = roomJson.getString("room_id");
+      String clientId = roomJson.getString("client_id");
+      String wssUrl = roomJson.getString("wss_url");
+      String wssPostUrl = roomJson.getString("wss_post_url");
+      boolean initiator = (roomJson.getBoolean("is_initiator"));
+      if (!initiator) {
+        iceCandidates = new ArrayList<>();
+        String messagesString = roomJson.getString("messages");
+        JSONArray messages = new JSONArray(messagesString);
+        for (int i = 0; i < messages.length(); ++i) {
+          String messageString = messages.getString(i);
+          JSONObject message = new JSONObject(messageString);
+          String messageType = message.getString("type");
+          Log.d(TAG, "GAE->C #" + i + " : " + messageString);
+          if (messageType.equals("offer")) {
+            offerSdp = new SessionDescription(
+                SessionDescription.Type.fromCanonicalForm(messageType), message.getString("sdp"));
+          } else if (messageType.equals("candidate")) {
+            IceCandidate candidate = new IceCandidate(
+                message.getString("id"), message.getInt("label"), message.getString("candidate"));
+            iceCandidates.add(candidate);
+          } else {
+            Log.e(TAG, "Unknown message: " + messageString);
+          }
+        }
+      }
+      Log.d(TAG, "RoomId: " + roomId + ". ClientId: " + clientId);
+      Log.d(TAG, "Initiator: " + initiator);
+      Log.d(TAG, "WSS url: " + wssUrl);
+      Log.d(TAG, "WSS POST url: " + wssPostUrl);
+
+      List<PeerConnection.IceServer> iceServers =
+          iceServersFromPCConfigJSON(roomJson.getString("pc_config"));
+      boolean isTurnPresent = false;
+      for (PeerConnection.IceServer server : iceServers) {
+        Log.d(TAG, "IceServer: " + server);
+        for (String uri : server.urls) {
+          if (uri.startsWith("turn:")) {
+            isTurnPresent = true;
+            break;
+          }
+        }
+      }
+      // Request TURN servers.
+      if (!isTurnPresent && !roomJson.optString("ice_server_url").isEmpty()) {
+        List<PeerConnection.IceServer> turnServers =
+            requestTurnServers(roomJson.getString("ice_server_url"));
+        for (PeerConnection.IceServer turnServer : turnServers) {
+          Log.d(TAG, "TurnServer: " + turnServer);
+          iceServers.add(turnServer);
+        }
+      }
+
+      SignalingParameters params = new SignalingParameters(
+          iceServers, initiator, clientId, wssUrl, wssPostUrl, offerSdp, iceCandidates);
+      events.onSignalingParametersReady(params);
+    } catch (JSONException e) {
+      events.onSignalingParametersError("Room JSON parsing error: " + e.toString());
+    } catch (IOException e) {
+      events.onSignalingParametersError("Room IO error: " + e.toString());
+    }
+  }
+
+  // Requests & returns a TURN ICE Server based on a request URL.  Must be run
+  // off the main thread!
+  @SuppressWarnings("UseNetworkAnnotations")
+  private List<PeerConnection.IceServer> requestTurnServers(String url)
+      throws IOException, JSONException {
+    List<PeerConnection.IceServer> turnServers = new ArrayList<>();
+    Log.d(TAG, "Request TURN from: " + url);
+    HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
+    connection.setDoOutput(true);
+    connection.setRequestProperty("REFERER", "https://appr.tc");
+    connection.setConnectTimeout(TURN_HTTP_TIMEOUT_MS);
+    connection.setReadTimeout(TURN_HTTP_TIMEOUT_MS);
+    int responseCode = connection.getResponseCode();
+    if (responseCode != 200) {
+      throw new IOException("Non-200 response when requesting TURN server from " + url + " : "
+          + connection.getHeaderField(null));
+    }
+    InputStream responseStream = connection.getInputStream();
+    String response = drainStream(responseStream);
+    connection.disconnect();
+    Log.d(TAG, "TURN response: " + response);
+    JSONObject responseJSON = new JSONObject(response);
+    JSONArray iceServers = responseJSON.getJSONArray("iceServers");
+    for (int i = 0; i < iceServers.length(); ++i) {
+      JSONObject server = iceServers.getJSONObject(i);
+      JSONArray turnUrls = server.getJSONArray("urls");
+      String username = server.has("username") ? server.getString("username") : "";
+      String credential = server.has("credential") ? server.getString("credential") : "";
+      for (int j = 0; j < turnUrls.length(); j++) {
+        String turnUrl = turnUrls.getString(j);
+        PeerConnection.IceServer turnServer =
+            PeerConnection.IceServer.builder(turnUrl)
+              .setUsername(username)
+              .setPassword(credential)
+              .createIceServer();
+        turnServers.add(turnServer);
+      }
+    }
+    return turnServers;
+  }
+
+  // Return the list of ICE servers described by a WebRTCPeerConnection
+  // configuration string.
+  private List<PeerConnection.IceServer> iceServersFromPCConfigJSON(String pcConfig)
+      throws JSONException {
+    JSONObject json = new JSONObject(pcConfig);
+    JSONArray servers = json.getJSONArray("iceServers");
+    List<PeerConnection.IceServer> ret = new ArrayList<>();
+    for (int i = 0; i < servers.length(); ++i) {
+      JSONObject server = servers.getJSONObject(i);
+      String url = server.getString("urls");
+      String credential = server.has("credential") ? server.getString("credential") : "";
+        PeerConnection.IceServer turnServer =
+            PeerConnection.IceServer.builder(url)
+              .setPassword(credential)
+              .createIceServer();
+      ret.add(turnServer);
+    }
+    return ret;
+  }
+
+  // Return the contents of an InputStream as a String.
+  private static String drainStream(InputStream in) {
+    Scanner s = new Scanner(in, "UTF-8").useDelimiter("\\A");
+    return s.hasNext() ? s.next() : "";
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RtcEventLog.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RtcEventLog.java
new file mode 100644
index 0000000000..103ad10f0b
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/RtcEventLog.java
@@ -0,0 +1,73 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+import java.io.File;
+import java.io.IOException;
+import org.webrtc.PeerConnection;
+
+public class RtcEventLog {
+  private static final String TAG = "RtcEventLog";
+  private static final int OUTPUT_FILE_MAX_BYTES = 10_000_000;
+  private final PeerConnection peerConnection;
+  private RtcEventLogState state = RtcEventLogState.INACTIVE;
+
+  enum RtcEventLogState {
+    INACTIVE,
+    STARTED,
+    STOPPED,
+  }
+
+  public RtcEventLog(PeerConnection peerConnection) {
+    if (peerConnection == null) {
+      throw new NullPointerException("The peer connection is null.");
+    }
+    this.peerConnection = peerConnection;
+  }
+
+  public void start(final File outputFile) {
+    if (state == RtcEventLogState.STARTED) {
+      Log.e(TAG, "RtcEventLog has already started.");
+      return;
+    }
+    final ParcelFileDescriptor fileDescriptor;
+    try {
+      fileDescriptor = ParcelFileDescriptor.open(outputFile,
+          ParcelFileDescriptor.MODE_READ_WRITE | ParcelFileDescriptor.MODE_CREATE
+              | ParcelFileDescriptor.MODE_TRUNCATE);
+    } catch (IOException e) {
+      Log.e(TAG, "Failed to create a new file", e);
+      return;
+    }
+
+    // Passes ownership of the file to WebRTC.
+    boolean success =
+        peerConnection.startRtcEventLog(fileDescriptor.detachFd(), OUTPUT_FILE_MAX_BYTES);
+    if (!success) {
+      Log.e(TAG, "Failed to start RTC event log.");
+      return;
+    }
+    state = RtcEventLogState.STARTED;
+    Log.d(TAG, "RtcEventLog started.");
+  }
+
+  public void stop() {
+    if (state != RtcEventLogState.STARTED) {
+      Log.e(TAG, "RtcEventLog was not started.");
+      return;
+    }
+    peerConnection.stopRtcEventLog();
+    state = RtcEventLogState.STOPPED;
+    Log.d(TAG, "RtcEventLog stopped.");
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/SettingsActivity.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/SettingsActivity.java
new file mode 100644
index 0000000000..e9c6f6b798
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/SettingsActivity.java
@@ -0,0 +1,317 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.app.Activity;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
+import android.os.Bundle;
+import android.preference.ListPreference;
+import android.preference.Preference;
+import org.webrtc.Camera2Enumerator;
+import org.webrtc.audio.JavaAudioDeviceModule;
+
+/**
+ * Settings activity for AppRTC.
+ */
+public class SettingsActivity extends Activity implements OnSharedPreferenceChangeListener {
+  private SettingsFragment settingsFragment;
+  private String keyprefVideoCall;
+  private String keyprefScreencapture;
+  private String keyprefCamera2;
+  private String keyprefResolution;
+  private String keyprefFps;
+  private String keyprefCaptureQualitySlider;
+  private String keyprefMaxVideoBitrateType;
+  private String keyprefMaxVideoBitrateValue;
+  private String keyPrefVideoCodec;
+  private String keyprefHwCodec;
+  private String keyprefCaptureToTexture;
+  private String keyprefFlexfec;
+
+  private String keyprefStartAudioBitrateType;
+  private String keyprefStartAudioBitrateValue;
+  private String keyPrefAudioCodec;
+  private String keyprefNoAudioProcessing;
+  private String keyprefAecDump;
+  private String keyprefEnableSaveInputAudioToFile;
+  private String keyprefOpenSLES;
+  private String keyprefDisableBuiltInAEC;
+  private String keyprefDisableBuiltInAGC;
+  private String keyprefDisableBuiltInNS;
+  private String keyprefDisableWebRtcAGCAndHPF;
+  private String keyprefSpeakerphone;
+
+  private String keyPrefRoomServerUrl;
+  private String keyPrefDisplayHud;
+  private String keyPrefTracing;
+  private String keyprefEnabledRtcEventLog;
+
+  private String keyprefEnableDataChannel;
+  private String keyprefOrdered;
+  private String keyprefMaxRetransmitTimeMs;
+  private String keyprefMaxRetransmits;
+  private String keyprefDataProtocol;
+  private String keyprefNegotiated;
+  private String keyprefDataId;
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    keyprefVideoCall = getString(R.string.pref_videocall_key);
+    keyprefScreencapture = getString(R.string.pref_screencapture_key);
+    keyprefCamera2 = getString(R.string.pref_camera2_key);
+    keyprefResolution = getString(R.string.pref_resolution_key);
+    keyprefFps = getString(R.string.pref_fps_key);
+    keyprefCaptureQualitySlider = getString(R.string.pref_capturequalityslider_key);
+    keyprefMaxVideoBitrateType = getString(R.string.pref_maxvideobitrate_key);
+    keyprefMaxVideoBitrateValue = getString(R.string.pref_maxvideobitratevalue_key);
+    keyPrefVideoCodec = getString(R.string.pref_videocodec_key);
+    keyprefHwCodec = getString(R.string.pref_hwcodec_key);
+    keyprefCaptureToTexture = getString(R.string.pref_capturetotexture_key);
+    keyprefFlexfec = getString(R.string.pref_flexfec_key);
+
+    keyprefStartAudioBitrateType = getString(R.string.pref_startaudiobitrate_key);
+    keyprefStartAudioBitrateValue = getString(R.string.pref_startaudiobitratevalue_key);
+    keyPrefAudioCodec = getString(R.string.pref_audiocodec_key);
+    keyprefNoAudioProcessing = getString(R.string.pref_noaudioprocessing_key);
+    keyprefAecDump = getString(R.string.pref_aecdump_key);
+    keyprefEnableSaveInputAudioToFile =
+        getString(R.string.pref_enable_save_input_audio_to_file_key);
+    keyprefOpenSLES = getString(R.string.pref_opensles_key);
+    keyprefDisableBuiltInAEC = getString(R.string.pref_disable_built_in_aec_key);
+    keyprefDisableBuiltInAGC = getString(R.string.pref_disable_built_in_agc_key);
+    keyprefDisableBuiltInNS = getString(R.string.pref_disable_built_in_ns_key);
+    keyprefDisableWebRtcAGCAndHPF = getString(R.string.pref_disable_webrtc_agc_and_hpf_key);
+    keyprefSpeakerphone = getString(R.string.pref_speakerphone_key);
+
+    keyprefEnableDataChannel = getString(R.string.pref_enable_datachannel_key);
+    keyprefOrdered = getString(R.string.pref_ordered_key);
+    keyprefMaxRetransmitTimeMs = getString(R.string.pref_max_retransmit_time_ms_key);
+    keyprefMaxRetransmits = getString(R.string.pref_max_retransmits_key);
+    keyprefDataProtocol = getString(R.string.pref_data_protocol_key);
+    keyprefNegotiated = getString(R.string.pref_negotiated_key);
+    keyprefDataId = getString(R.string.pref_data_id_key);
+
+    keyPrefRoomServerUrl = getString(R.string.pref_room_server_url_key);
+    keyPrefDisplayHud = getString(R.string.pref_displayhud_key);
+    keyPrefTracing = getString(R.string.pref_tracing_key);
+    keyprefEnabledRtcEventLog = getString(R.string.pref_enable_rtceventlog_key);
+
+    // Display the fragment as the main content.
+    settingsFragment = new SettingsFragment();
+    getFragmentManager()
+        .beginTransaction()
+        .replace(android.R.id.content, settingsFragment)
+        .commit();
+  }
+
+  @Override
+  protected void onResume() {
+    super.onResume();
+    // Set summary to be the user-description for the selected value
+    SharedPreferences sharedPreferences =
+        settingsFragment.getPreferenceScreen().getSharedPreferences();
+    sharedPreferences.registerOnSharedPreferenceChangeListener(this);
+    updateSummaryB(sharedPreferences, keyprefVideoCall);
+    updateSummaryB(sharedPreferences, keyprefScreencapture);
+    updateSummaryB(sharedPreferences, keyprefCamera2);
+    updateSummary(sharedPreferences, keyprefResolution);
+    updateSummary(sharedPreferences, keyprefFps);
+    updateSummaryB(sharedPreferences, keyprefCaptureQualitySlider);
+    updateSummary(sharedPreferences, keyprefMaxVideoBitrateType);
+    updateSummaryBitrate(sharedPreferences, keyprefMaxVideoBitrateValue);
+    setVideoBitrateEnable(sharedPreferences);
+    updateSummary(sharedPreferences, keyPrefVideoCodec);
+    updateSummaryB(sharedPreferences, keyprefHwCodec);
+    updateSummaryB(sharedPreferences, keyprefCaptureToTexture);
+    updateSummaryB(sharedPreferences, keyprefFlexfec);
+
+    updateSummary(sharedPreferences, keyprefStartAudioBitrateType);
+    updateSummaryBitrate(sharedPreferences, keyprefStartAudioBitrateValue);
+    setAudioBitrateEnable(sharedPreferences);
+    updateSummary(sharedPreferences, keyPrefAudioCodec);
+    updateSummaryB(sharedPreferences, keyprefNoAudioProcessing);
+    updateSummaryB(sharedPreferences, keyprefAecDump);
+    updateSummaryB(sharedPreferences, keyprefEnableSaveInputAudioToFile);
+    updateSummaryB(sharedPreferences, keyprefOpenSLES);
+    updateSummaryB(sharedPreferences, keyprefDisableBuiltInAEC);
+    updateSummaryB(sharedPreferences, keyprefDisableBuiltInAGC);
+    updateSummaryB(sharedPreferences, keyprefDisableBuiltInNS);
+    updateSummaryB(sharedPreferences, keyprefDisableWebRtcAGCAndHPF);
+    updateSummaryList(sharedPreferences, keyprefSpeakerphone);
+
+    updateSummaryB(sharedPreferences, keyprefEnableDataChannel);
+    updateSummaryB(sharedPreferences, keyprefOrdered);
+    updateSummary(sharedPreferences, keyprefMaxRetransmitTimeMs);
+    updateSummary(sharedPreferences, keyprefMaxRetransmits);
+    updateSummary(sharedPreferences, keyprefDataProtocol);
+    updateSummaryB(sharedPreferences, keyprefNegotiated);
+    updateSummary(sharedPreferences, keyprefDataId);
+    setDataChannelEnable(sharedPreferences);
+
+    updateSummary(sharedPreferences, keyPrefRoomServerUrl);
+    updateSummaryB(sharedPreferences, keyPrefDisplayHud);
+    updateSummaryB(sharedPreferences, keyPrefTracing);
+    updateSummaryB(sharedPreferences, keyprefEnabledRtcEventLog);
+
+    if (!Camera2Enumerator.isSupported(this)) {
+      Preference camera2Preference = settingsFragment.findPreference(keyprefCamera2);
+
+      camera2Preference.setSummary(getString(R.string.pref_camera2_not_supported));
+      camera2Preference.setEnabled(false);
+    }
+
+    if (!JavaAudioDeviceModule.isBuiltInAcousticEchoCancelerSupported()) {
+      Preference disableBuiltInAECPreference =
+          settingsFragment.findPreference(keyprefDisableBuiltInAEC);
+
+      disableBuiltInAECPreference.setSummary(getString(R.string.pref_built_in_aec_not_available));
+      disableBuiltInAECPreference.setEnabled(false);
+    }
+
+    Preference disableBuiltInAGCPreference =
+        settingsFragment.findPreference(keyprefDisableBuiltInAGC);
+
+    disableBuiltInAGCPreference.setSummary(getString(R.string.pref_built_in_agc_not_available));
+    disableBuiltInAGCPreference.setEnabled(false);
+
+    if (!JavaAudioDeviceModule.isBuiltInNoiseSuppressorSupported()) {
+      Preference disableBuiltInNSPreference =
+          settingsFragment.findPreference(keyprefDisableBuiltInNS);
+
+      disableBuiltInNSPreference.setSummary(getString(R.string.pref_built_in_ns_not_available));
+      disableBuiltInNSPreference.setEnabled(false);
+    }
+  }
+
+  @Override
+  protected void onPause() {
+    super.onPause();
+    SharedPreferences sharedPreferences =
+        settingsFragment.getPreferenceScreen().getSharedPreferences();
+    sharedPreferences.unregisterOnSharedPreferenceChangeListener(this);
+  }
+
+  @Override
+  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+    // clang-format off
+    if (key.equals(keyprefResolution)
+        || key.equals(keyprefFps)
+        || key.equals(keyprefMaxVideoBitrateType)
+        || key.equals(keyPrefVideoCodec)
+        || key.equals(keyprefStartAudioBitrateType)
+        || key.equals(keyPrefAudioCodec)
+        || key.equals(keyPrefRoomServerUrl)
+        || key.equals(keyprefMaxRetransmitTimeMs)
+        || key.equals(keyprefMaxRetransmits)
+        || key.equals(keyprefDataProtocol)
+        || key.equals(keyprefDataId)) {
+      updateSummary(sharedPreferences, key);
+    } else if (key.equals(keyprefMaxVideoBitrateValue)
+        || key.equals(keyprefStartAudioBitrateValue)) {
+      updateSummaryBitrate(sharedPreferences, key);
+    } else if (key.equals(keyprefVideoCall)
+        || key.equals(keyprefScreencapture)
+        || key.equals(keyprefCamera2)
+        || key.equals(keyPrefTracing)
+        || key.equals(keyprefCaptureQualitySlider)
+        || key.equals(keyprefHwCodec)
+        || key.equals(keyprefCaptureToTexture)
+        || key.equals(keyprefFlexfec)
+        || key.equals(keyprefNoAudioProcessing)
+        || key.equals(keyprefAecDump)
+        || key.equals(keyprefEnableSaveInputAudioToFile)
+        || key.equals(keyprefOpenSLES)
+        || key.equals(keyprefDisableBuiltInAEC)
+        || key.equals(keyprefDisableBuiltInAGC)
+        || key.equals(keyprefDisableBuiltInNS)
+        || key.equals(keyprefDisableWebRtcAGCAndHPF)
+        || key.equals(keyPrefDisplayHud)
+        || key.equals(keyprefEnableDataChannel)
+        || key.equals(keyprefOrdered)
+        || key.equals(keyprefNegotiated)
+        || key.equals(keyprefEnabledRtcEventLog)) {
+      updateSummaryB(sharedPreferences, key);
+    } else if (key.equals(keyprefSpeakerphone)) {
+      updateSummaryList(sharedPreferences, key);
+    }
+    // clang-format on
+    if (key.equals(keyprefMaxVideoBitrateType)) {
+      setVideoBitrateEnable(sharedPreferences);
+    }
+    if (key.equals(keyprefStartAudioBitrateType)) {
+      setAudioBitrateEnable(sharedPreferences);
+    }
+    if (key.equals(keyprefEnableDataChannel)) {
+      setDataChannelEnable(sharedPreferences);
+    }
+  }
+
+  private void updateSummary(SharedPreferences sharedPreferences, String key) {
+    Preference updatedPref = settingsFragment.findPreference(key);
+    // Set summary to be the user-description for the selected value
+    updatedPref.setSummary(sharedPreferences.getString(key, ""));
+  }
+
+  private void updateSummaryBitrate(SharedPreferences sharedPreferences, String key) {
+    Preference updatedPref = settingsFragment.findPreference(key);
+    updatedPref.setSummary(sharedPreferences.getString(key, "") + " kbps");
+  }
+
+  private void updateSummaryB(SharedPreferences sharedPreferences, String key) {
+    Preference updatedPref = settingsFragment.findPreference(key);
+    updatedPref.setSummary(sharedPreferences.getBoolean(key, true)
+            ? getString(R.string.pref_value_enabled)
+            : getString(R.string.pref_value_disabled));
+  }
+
+  private void updateSummaryList(SharedPreferences sharedPreferences, String key) {
+    ListPreference updatedPref = (ListPreference) settingsFragment.findPreference(key);
+    updatedPref.setSummary(updatedPref.getEntry());
+  }
+
+  private void setVideoBitrateEnable(SharedPreferences sharedPreferences) {
+    Preference bitratePreferenceValue =
+        settingsFragment.findPreference(keyprefMaxVideoBitrateValue);
+    String bitrateTypeDefault = getString(R.string.pref_maxvideobitrate_default);
+    String bitrateType =
+        sharedPreferences.getString(keyprefMaxVideoBitrateType, bitrateTypeDefault);
+    if (bitrateType.equals(bitrateTypeDefault)) {
+      bitratePreferenceValue.setEnabled(false);
+    } else {
+      bitratePreferenceValue.setEnabled(true);
+    }
+  }
+
+  private void setAudioBitrateEnable(SharedPreferences sharedPreferences) {
+    Preference bitratePreferenceValue =
+        settingsFragment.findPreference(keyprefStartAudioBitrateValue);
+    String bitrateTypeDefault = getString(R.string.pref_startaudiobitrate_default);
+    String bitrateType =
+        sharedPreferences.getString(keyprefStartAudioBitrateType, bitrateTypeDefault);
+    if (bitrateType.equals(bitrateTypeDefault)) {
+      bitratePreferenceValue.setEnabled(false);
+    } else {
+      bitratePreferenceValue.setEnabled(true);
+    }
+  }
+
+  private void setDataChannelEnable(SharedPreferences sharedPreferences) {
+    boolean enabled = sharedPreferences.getBoolean(keyprefEnableDataChannel, true);
+    settingsFragment.findPreference(keyprefOrdered).setEnabled(enabled);
+    settingsFragment.findPreference(keyprefMaxRetransmitTimeMs).setEnabled(enabled);
+    settingsFragment.findPreference(keyprefMaxRetransmits).setEnabled(enabled);
+    settingsFragment.findPreference(keyprefDataProtocol).setEnabled(enabled);
+    settingsFragment.findPreference(keyprefNegotiated).setEnabled(enabled);
+    settingsFragment.findPreference(keyprefDataId).setEnabled(enabled);
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/SettingsFragment.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/SettingsFragment.java
new file mode 100644
index 0000000000..d969bd7d32
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/SettingsFragment.java
@@ -0,0 +1,26 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.os.Bundle;
+import android.preference.PreferenceFragment;
+
+/**
+ * Settings fragment for AppRTC.
+ */
+public class SettingsFragment extends PreferenceFragment {
+  @Override
+  public void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    // Load the preferences from an XML resource
+    addPreferencesFromResource(R.xml.preferences);
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/TCPChannelClient.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/TCPChannelClient.java
new file mode 100644
index 0000000000..d869d7ca66
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/TCPChannelClient.java
@@ -0,0 +1,362 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.util.Log;
+import androidx.annotation.Nullable;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.nio.charset.Charset;
+import java.util.concurrent.ExecutorService;
+import org.webrtc.ThreadUtils;
+
+/**
+ * Replacement for WebSocketChannelClient for direct communication between two IP addresses. Handles
+ * the signaling between the two clients using a TCP connection.
+ * <p>
+ * All public methods should be called from a looper executor thread
+ * passed in a constructor, otherwise exception will be thrown.
+ * All events are dispatched on the same thread.
+ */
+public class TCPChannelClient {
+  private static final String TAG = "TCPChannelClient";
+
+  private final ExecutorService executor;
+  private final ThreadUtils.ThreadChecker executorThreadCheck;
+  private final TCPChannelEvents eventListener;
+  private TCPSocket socket;
+
+  /**
+   * Callback interface for messages delivered on TCP Connection. All callbacks are invoked from the
+   * looper executor thread.
+   */
+  public interface TCPChannelEvents {
+    void onTCPConnected(boolean server);
+    void onTCPMessage(String message);
+    void onTCPError(String description);
+    void onTCPClose();
+  }
+
+  /**
+   * Initializes the TCPChannelClient. If IP is a local IP address, starts a listening server on
+   * that IP. If not, instead connects to the IP.
+   *
+   * @param eventListener Listener that will receive events from the client.
+   * @param ip            IP address to listen on or connect to.
+   * @param port          Port to listen on or connect to.
+   */
+  public TCPChannelClient(
+      ExecutorService executor, TCPChannelEvents eventListener, String ip, int port) {
+    this.executor = executor;
+    executorThreadCheck = new ThreadUtils.ThreadChecker();
+    executorThreadCheck.detachThread();
+    this.eventListener = eventListener;
+
+    InetAddress address;
+    try {
+      address = InetAddress.getByName(ip);
+    } catch (UnknownHostException e) {
+      reportError("Invalid IP address.");
+      return;
+    }
+
+    if (address.isAnyLocalAddress()) {
+      socket = new TCPSocketServer(address, port);
+    } else {
+      socket = new TCPSocketClient(address, port);
+    }
+
+    socket.start();
+  }
+
+  /**
+   * Disconnects the client if not already disconnected. This will fire the onTCPClose event.
+   */
+  public void disconnect() {
+    executorThreadCheck.checkIsOnValidThread();
+
+    socket.disconnect();
+  }
+
+  /**
+   * Sends a message on the socket.
+   *
+   * @param message Message to be sent.
+   */
+  public void send(String message) {
+    executorThreadCheck.checkIsOnValidThread();
+
+    socket.send(message);
+  }
+
+  /**
+   * Helper method for firing onTCPError events. Calls onTCPError on the executor thread.
+   */
+  private void reportError(final String message) {
+    Log.e(TAG, "TCP Error: " + message);
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        eventListener.onTCPError(message);
+      }
+    });
+  }
+
+  /**
+   * Base class for server and client sockets. Contains a listening thread that will call
+   * eventListener.onTCPMessage on new messages.
+   */
+  private abstract class TCPSocket extends Thread {
+    // Lock for editing out and rawSocket
+    protected final Object rawSocketLock;
+    @Nullable
+    private PrintWriter out;
+    @Nullable
+    private Socket rawSocket;
+
+    /**
+     * Connect to the peer, potentially a slow operation.
+     *
+     * @return Socket connection, null if connection failed.
+     */
+    @Nullable
+    public abstract Socket connect();
+
+    /** Returns true if sockets is a server rawSocket. */
+    public abstract boolean isServer();
+
+    TCPSocket() {
+      rawSocketLock = new Object();
+    }
+
+    /**
+     * The listening thread.
+     */
+    @Override
+    public void run() {
+      Log.d(TAG, "Listening thread started...");
+
+      // Receive connection to temporary variable first, so we don't block.
+      Socket tempSocket = connect();
+      BufferedReader in;
+
+      Log.d(TAG, "TCP connection established.");
+
+      synchronized (rawSocketLock) {
+        if (rawSocket != null) {
+          Log.e(TAG, "Socket already existed and will be replaced.");
+        }
+
+        rawSocket = tempSocket;
+
+        // Connecting failed, error has already been reported, just exit.
+        if (rawSocket == null) {
+          return;
+        }
+
+        try {
+          out = new PrintWriter(
+              new OutputStreamWriter(rawSocket.getOutputStream(), Charset.forName("UTF-8")), true);
+          in = new BufferedReader(
+              new InputStreamReader(rawSocket.getInputStream(), Charset.forName("UTF-8")));
+        } catch (IOException e) {
+          reportError("Failed to open IO on rawSocket: " + e.getMessage());
+          return;
+        }
+      }
+
+      Log.v(TAG, "Execute onTCPConnected");
+      executor.execute(new Runnable() {
+        @Override
+        public void run() {
+          Log.v(TAG, "Run onTCPConnected");
+          eventListener.onTCPConnected(isServer());
+        }
+      });
+
+      while (true) {
+        final String message;
+        try {
+          message = in.readLine();
+        } catch (IOException e) {
+          synchronized (rawSocketLock) {
+            // If socket was closed, this is expected.
+            if (rawSocket == null) {
+              break;
+            }
+          }
+
+          reportError("Failed to read from rawSocket: " + e.getMessage());
+          break;
+        }
+
+        // No data received, rawSocket probably closed.
+        if (message == null) {
+          break;
+        }
+
+        executor.execute(new Runnable() {
+          @Override
+          public void run() {
+            Log.v(TAG, "Receive: " + message);
+            eventListener.onTCPMessage(message);
+          }
+        });
+      }
+
+      Log.d(TAG, "Receiving thread exiting...");
+
+      // Close the rawSocket if it is still open.
+      disconnect();
+    }
+
+    /** Closes the rawSocket if it is still open. Also fires the onTCPClose event. */
+    public void disconnect() {
+      try {
+        synchronized (rawSocketLock) {
+          if (rawSocket != null) {
+            rawSocket.close();
+            rawSocket = null;
+            out = null;
+
+            executor.execute(new Runnable() {
+              @Override
+              public void run() {
+                eventListener.onTCPClose();
+              }
+            });
+          }
+        }
+      } catch (IOException e) {
+        reportError("Failed to close rawSocket: " + e.getMessage());
+      }
+    }
+
+    /**
+     * Sends a message on the socket. Should only be called on the executor thread.
+     */
+    public void send(String message) {
+      Log.v(TAG, "Send: " + message);
+
+      synchronized (rawSocketLock) {
+        if (out == null) {
+          reportError("Sending data on closed socket.");
+          return;
+        }
+
+        out.write(message + "\n");
+        out.flush();
+      }
+    }
+  }
+
+  private class TCPSocketServer extends TCPSocket {
+    // Server socket is also guarded by rawSocketLock.
+    @Nullable
+    private ServerSocket serverSocket;
+
+    final private InetAddress address;
+    final private int port;
+
+    public TCPSocketServer(InetAddress address, int port) {
+      this.address = address;
+      this.port = port;
+    }
+
+    /** Opens a listening socket and waits for a connection. */
+    @Nullable
+    @Override
+    public Socket connect() {
+      Log.d(TAG, "Listening on [" + address.getHostAddress() + "]:" + Integer.toString(port));
+
+      final ServerSocket tempSocket;
+      try {
+        tempSocket = new ServerSocket(port, 0, address);
+      } catch (IOException e) {
+        reportError("Failed to create server socket: " + e.getMessage());
+        return null;
+      }
+
+      synchronized (rawSocketLock) {
+        if (serverSocket != null) {
+          Log.e(TAG, "Server rawSocket was already listening and new will be opened.");
+        }
+
+        serverSocket = tempSocket;
+      }
+
+      try {
+        return tempSocket.accept();
+      } catch (IOException e) {
+        reportError("Failed to receive connection: " + e.getMessage());
+        return null;
+      }
+    }
+
+    /** Closes the listening socket and calls super. */
+    @Override
+    public void disconnect() {
+      try {
+        synchronized (rawSocketLock) {
+          if (serverSocket != null) {
+            serverSocket.close();
+            serverSocket = null;
+          }
+        }
+      } catch (IOException e) {
+        reportError("Failed to close server socket: " + e.getMessage());
+      }
+
+      super.disconnect();
+    }
+
+    @Override
+    public boolean isServer() {
+      return true;
+    }
+  }
+
+  private class TCPSocketClient extends TCPSocket {
+    final private InetAddress address;
+    final private int port;
+
+    public TCPSocketClient(InetAddress address, int port) {
+      this.address = address;
+      this.port = port;
+    }
+
+    /** Connects to the peer. */
+    @Nullable
+    @Override
+    public Socket connect() {
+      Log.d(TAG, "Connecting to [" + address.getHostAddress() + "]:" + Integer.toString(port));
+
+      try {
+        return new Socket(address, port);
+      } catch (IOException e) {
+        reportError("Failed to connect: " + e.getMessage());
+        return null;
+      }
+    }
+
+    @Override
+    public boolean isServer() {
+      return false;
+    }
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/UnhandledExceptionHandler.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/UnhandledExceptionHandler.java
new file mode 100644
index 0000000000..b256400119
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/UnhandledExceptionHandler.java
@@ -0,0 +1,85 @@
+/*
+ *  Copyright 2013 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.util.Log;
+import android.util.TypedValue;
+import android.widget.ScrollView;
+import android.widget.TextView;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+/**
+ * Singleton helper: install a default unhandled exception handler which shows
+ * an informative dialog and kills the app.  Useful for apps whose
+ * error-handling consists of throwing RuntimeExceptions.
+ * NOTE: almost always more useful to
+ * Thread.setDefaultUncaughtExceptionHandler() rather than
+ * Thread.setUncaughtExceptionHandler(), to apply to background threads as well.
+ */
+public class UnhandledExceptionHandler implements Thread.UncaughtExceptionHandler {
+  private static final String TAG = "AppRTCMobileActivity";
+  private final Activity activity;
+
+  public UnhandledExceptionHandler(final Activity activity) {
+    this.activity = activity;
+  }
+
+  @Override
+  public void uncaughtException(Thread unusedThread, final Throwable e) {
+    activity.runOnUiThread(new Runnable() {
+      @Override
+      public void run() {
+        String title = "Fatal error: " + getTopLevelCauseMessage(e);
+        String msg = getRecursiveStackTrace(e);
+        TextView errorView = new TextView(activity);
+        errorView.setText(msg);
+        errorView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 8);
+        ScrollView scrollingContainer = new ScrollView(activity);
+        scrollingContainer.addView(errorView);
+        Log.e(TAG, title + "\n\n" + msg);
+        DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
+          @Override
+          public void onClick(DialogInterface dialog, int which) {
+            dialog.dismiss();
+            System.exit(1);
+          }
+        };
+        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
+        builder.setTitle(title)
+            .setView(scrollingContainer)
+            .setPositiveButton("Exit", listener)
+            .show();
+      }
+    });
+  }
+
+  // Returns the Message attached to the original Cause of `t`.
+  private static String getTopLevelCauseMessage(Throwable t) {
+    Throwable topLevelCause = t;
+    while (topLevelCause.getCause() != null) {
+      topLevelCause = topLevelCause.getCause();
+    }
+    return topLevelCause.getMessage();
+  }
+
+  // Returns a human-readable String of the stacktrace in `t`, recursively
+  // through all Causes that led to `t`.
+  private static String getRecursiveStackTrace(Throwable t) {
+    StringWriter writer = new StringWriter();
+    t.printStackTrace(new PrintWriter(writer));
+    return writer.toString();
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/WebSocketChannelClient.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/WebSocketChannelClient.java
new file mode 100644
index 0000000000..5fa410889a
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/WebSocketChannelClient.java
@@ -0,0 +1,296 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.os.Handler;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import de.tavendo.autobahn.WebSocket.WebSocketConnectionObserver;
+import de.tavendo.autobahn.WebSocketConnection;
+import de.tavendo.autobahn.WebSocketException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.List;
+import org.appspot.apprtc.util.AsyncHttpURLConnection;
+import org.appspot.apprtc.util.AsyncHttpURLConnection.AsyncHttpEvents;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * WebSocket client implementation.
+ *
+ * <p>All public methods should be called from a looper executor thread
+ * passed in a constructor, otherwise exception will be thrown.
+ * All events are dispatched on the same thread.
+ */
+public class WebSocketChannelClient {
+  private static final String TAG = "WSChannelRTCClient";
+  private static final int CLOSE_TIMEOUT = 1000;
+  private final WebSocketChannelEvents events;
+  private final Handler handler;
+  private WebSocketConnection ws;
+  private String wsServerUrl;
+  private String postServerUrl;
+  @Nullable
+  private String roomID;
+  @Nullable
+  private String clientID;
+  private WebSocketConnectionState state;
+  // Do not remove this member variable. If this is removed, the observer gets garbage collected and
+  // this causes test breakages.
+  private WebSocketObserver wsObserver;
+  private final Object closeEventLock = new Object();
+  private boolean closeEvent;
+  // WebSocket send queue. Messages are added to the queue when WebSocket
+  // client is not registered and are consumed in register() call.
+  private final List<String> wsSendQueue = new ArrayList<>();
+
+  /**
+   * Possible WebSocket connection states.
+   */
+  public enum WebSocketConnectionState { NEW, CONNECTED, REGISTERED, CLOSED, ERROR }
+
+  /**
+   * Callback interface for messages delivered on WebSocket.
+   * All events are dispatched from a looper executor thread.
+   */
+  public interface WebSocketChannelEvents {
+    void onWebSocketMessage(final String message);
+    void onWebSocketClose();
+    void onWebSocketError(final String description);
+  }
+
+  public WebSocketChannelClient(Handler handler, WebSocketChannelEvents events) {
+    this.handler = handler;
+    this.events = events;
+    roomID = null;
+    clientID = null;
+    state = WebSocketConnectionState.NEW;
+  }
+
+  public WebSocketConnectionState getState() {
+    return state;
+  }
+
+  public void connect(final String wsUrl, final String postUrl) {
+    checkIfCalledOnValidThread();
+    if (state != WebSocketConnectionState.NEW) {
+      Log.e(TAG, "WebSocket is already connected.");
+      return;
+    }
+    wsServerUrl = wsUrl;
+    postServerUrl = postUrl;
+    closeEvent = false;
+
+    Log.d(TAG, "Connecting WebSocket to: " + wsUrl + ". Post URL: " + postUrl);
+    ws = new WebSocketConnection();
+    wsObserver = new WebSocketObserver();
+    try {
+      ws.connect(new URI(wsServerUrl), wsObserver);
+    } catch (URISyntaxException e) {
+      reportError("URI error: " + e.getMessage());
+    } catch (WebSocketException e) {
+      reportError("WebSocket connection error: " + e.getMessage());
+    }
+  }
+
+  public void register(final String roomID, final String clientID) {
+    checkIfCalledOnValidThread();
+    this.roomID = roomID;
+    this.clientID = clientID;
+    if (state != WebSocketConnectionState.CONNECTED) {
+      Log.w(TAG, "WebSocket register() in state " + state);
+      return;
+    }
+    Log.d(TAG, "Registering WebSocket for room " + roomID + ". ClientID: " + clientID);
+    JSONObject json = new JSONObject();
+    try {
+      json.put("cmd", "register");
+      json.put("roomid", roomID);
+      json.put("clientid", clientID);
+      Log.d(TAG, "C->WSS: " + json.toString());
+      ws.sendTextMessage(json.toString());
+      state = WebSocketConnectionState.REGISTERED;
+      // Send any previously accumulated messages.
+      for (String sendMessage : wsSendQueue) {
+        send(sendMessage);
+      }
+      wsSendQueue.clear();
+    } catch (JSONException e) {
+      reportError("WebSocket register JSON error: " + e.getMessage());
+    }
+  }
+
+  public void send(String message) {
+    checkIfCalledOnValidThread();
+    switch (state) {
+      case NEW:
+      case CONNECTED:
+        // Store outgoing messages and send them after websocket client
+        // is registered.
+        Log.d(TAG, "WS ACC: " + message);
+        wsSendQueue.add(message);
+        return;
+      case ERROR:
+      case CLOSED:
+        Log.e(TAG, "WebSocket send() in error or closed state : " + message);
+        return;
+      case REGISTERED:
+        JSONObject json = new JSONObject();
+        try {
+          json.put("cmd", "send");
+          json.put("msg", message);
+          message = json.toString();
+          Log.d(TAG, "C->WSS: " + message);
+          ws.sendTextMessage(message);
+        } catch (JSONException e) {
+          reportError("WebSocket send JSON error: " + e.getMessage());
+        }
+        break;
+    }
+  }
+
+  // This call can be used to send WebSocket messages before WebSocket
+  // connection is opened.
+  public void post(String message) {
+    checkIfCalledOnValidThread();
+    sendWSSMessage("POST", message);
+  }
+
+  public void disconnect(boolean waitForComplete) {
+    checkIfCalledOnValidThread();
+    Log.d(TAG, "Disconnect WebSocket. State: " + state);
+    if (state == WebSocketConnectionState.REGISTERED) {
+      // Send "bye" to WebSocket server.
+      send("{\"type\": \"bye\"}");
+      state = WebSocketConnectionState.CONNECTED;
+      // Send http DELETE to http WebSocket server.
+      sendWSSMessage("DELETE", "");
+    }
+    // Close WebSocket in CONNECTED or ERROR states only.
+    if (state == WebSocketConnectionState.CONNECTED || state == WebSocketConnectionState.ERROR) {
+      ws.disconnect();
+      state = WebSocketConnectionState.CLOSED;
+
+      // Wait for websocket close event to prevent websocket library from
+      // sending any pending messages to deleted looper thread.
+      if (waitForComplete) {
+        synchronized (closeEventLock) {
+          while (!closeEvent) {
+            try {
+              closeEventLock.wait(CLOSE_TIMEOUT);
+              break;
+            } catch (InterruptedException e) {
+              Log.e(TAG, "Wait error: " + e.toString());
+            }
+          }
+        }
+      }
+    }
+    Log.d(TAG, "Disconnecting WebSocket done.");
+  }
+
+  private void reportError(final String errorMessage) {
+    Log.e(TAG, errorMessage);
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        if (state != WebSocketConnectionState.ERROR) {
+          state = WebSocketConnectionState.ERROR;
+          events.onWebSocketError(errorMessage);
+        }
+      }
+    });
+  }
+
+  // Asynchronously send POST/DELETE to WebSocket server.
+  private void sendWSSMessage(final String method, final String message) {
+    String postUrl = postServerUrl + "/" + roomID + "/" + clientID;
+    Log.d(TAG, "WS " + method + " : " + postUrl + " : " + message);
+    AsyncHttpURLConnection httpConnection =
+        new AsyncHttpURLConnection(method, postUrl, message, new AsyncHttpEvents() {
+          @Override
+          public void onHttpError(String errorMessage) {
+            reportError("WS " + method + " error: " + errorMessage);
+          }
+
+          @Override
+          public void onHttpComplete(String response) {}
+        });
+    httpConnection.send();
+  }
+
+  // Helper method for debugging purposes. Ensures that WebSocket method is
+  // called on a looper thread.
+  private void checkIfCalledOnValidThread() {
+    if (Thread.currentThread() != handler.getLooper().getThread()) {
+      throw new IllegalStateException("WebSocket method is not called on valid thread");
+    }
+  }
+
+  private class WebSocketObserver implements WebSocketConnectionObserver {
+    @Override
+    public void onOpen() {
+      Log.d(TAG, "WebSocket connection opened to: " + wsServerUrl);
+      handler.post(new Runnable() {
+        @Override
+        public void run() {
+          state = WebSocketConnectionState.CONNECTED;
+          // Check if we have pending register request.
+          if (roomID != null && clientID != null) {
+            register(roomID, clientID);
+          }
+        }
+      });
+    }
+
+    @Override
+    public void onClose(WebSocketCloseNotification code, String reason) {
+      Log.d(TAG, "WebSocket connection closed. Code: " + code + ". Reason: " + reason + ". State: "
+              + state);
+      synchronized (closeEventLock) {
+        closeEvent = true;
+        closeEventLock.notify();
+      }
+      handler.post(new Runnable() {
+        @Override
+        public void run() {
+          if (state != WebSocketConnectionState.CLOSED) {
+            state = WebSocketConnectionState.CLOSED;
+            events.onWebSocketClose();
+          }
+        }
+      });
+    }
+
+    @Override
+    public void onTextMessage(String payload) {
+      Log.d(TAG, "WSS->C: " + payload);
+      final String message = payload;
+      handler.post(new Runnable() {
+        @Override
+        public void run() {
+          if (state == WebSocketConnectionState.CONNECTED
+              || state == WebSocketConnectionState.REGISTERED) {
+            events.onWebSocketMessage(message);
+          }
+        }
+      });
+    }
+
+    @Override
+    public void onRawTextMessage(byte[] payload) {}
+
+    @Override
+    public void onBinaryMessage(byte[] payload) {}
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/WebSocketRTCClient.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/WebSocketRTCClient.java
new file mode 100644
index 0000000000..cbfdb21c91
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/WebSocketRTCClient.java
@@ -0,0 +1,427 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc;
+
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.util.Log;
+import androidx.annotation.Nullable;
+import org.appspot.apprtc.RoomParametersFetcher.RoomParametersFetcherEvents;
+import org.appspot.apprtc.WebSocketChannelClient.WebSocketChannelEvents;
+import org.appspot.apprtc.WebSocketChannelClient.WebSocketConnectionState;
+import org.appspot.apprtc.util.AsyncHttpURLConnection;
+import org.appspot.apprtc.util.AsyncHttpURLConnection.AsyncHttpEvents;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.webrtc.IceCandidate;
+import org.webrtc.SessionDescription;
+
+/**
+ * Negotiates signaling for chatting with https://appr.tc "rooms".
+ * Uses the client<->server specifics of the apprtc AppEngine webapp.
+ *
+ * <p>To use: create an instance of this object (registering a message handler) and
+ * call connectToRoom().  Once room connection is established
+ * onConnectedToRoom() callback with room parameters is invoked.
+ * Messages to other party (with local Ice candidates and answer SDP) can
+ * be sent after WebSocket connection is established.
+ */
+public class WebSocketRTCClient implements AppRTCClient, WebSocketChannelEvents {
+  private static final String TAG = "WSRTCClient";
+  private static final String ROOM_JOIN = "join";
+  private static final String ROOM_MESSAGE = "message";
+  private static final String ROOM_LEAVE = "leave";
+
+  private enum ConnectionState { NEW, CONNECTED, CLOSED, ERROR }
+
+  private enum MessageType { MESSAGE, LEAVE }
+
+  private final Handler handler;
+  private boolean initiator;
+  private SignalingEvents events;
+  private WebSocketChannelClient wsClient;
+  private ConnectionState roomState;
+  private RoomConnectionParameters connectionParameters;
+  private String messageUrl;
+  private String leaveUrl;
+
+  public WebSocketRTCClient(SignalingEvents events) {
+    this.events = events;
+    roomState = ConnectionState.NEW;
+    final HandlerThread handlerThread = new HandlerThread(TAG);
+    handlerThread.start();
+    handler = new Handler(handlerThread.getLooper());
+  }
+
+  // --------------------------------------------------------------------
+  // AppRTCClient interface implementation.
+  // Asynchronously connect to an AppRTC room URL using supplied connection
+  // parameters, retrieves room parameters and connect to WebSocket server.
+  @Override
+  public void connectToRoom(RoomConnectionParameters connectionParameters) {
+    this.connectionParameters = connectionParameters;
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        connectToRoomInternal();
+      }
+    });
+  }
+
+  @Override
+  public void disconnectFromRoom() {
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        disconnectFromRoomInternal();
+        handler.getLooper().quit();
+      }
+    });
+  }
+
+  // Connects to room - function runs on a local looper thread.
+  private void connectToRoomInternal() {
+    String connectionUrl = getConnectionUrl(connectionParameters);
+    Log.d(TAG, "Connect to room: " + connectionUrl);
+    roomState = ConnectionState.NEW;
+    wsClient = new WebSocketChannelClient(handler, this);
+
+    RoomParametersFetcherEvents callbacks = new RoomParametersFetcherEvents() {
+      @Override
+      public void onSignalingParametersReady(final SignalingParameters params) {
+        WebSocketRTCClient.this.handler.post(new Runnable() {
+          @Override
+          public void run() {
+            WebSocketRTCClient.this.signalingParametersReady(params);
+          }
+        });
+      }
+
+      @Override
+      public void onSignalingParametersError(String description) {
+        WebSocketRTCClient.this.reportError(description);
+      }
+    };
+
+    new RoomParametersFetcher(connectionUrl, null, callbacks).makeRequest();
+  }
+
+  // Disconnect from room and send bye messages - runs on a local looper thread.
+  private void disconnectFromRoomInternal() {
+    Log.d(TAG, "Disconnect. Room state: " + roomState);
+    if (roomState == ConnectionState.CONNECTED) {
+      Log.d(TAG, "Closing room.");
+      sendPostMessage(MessageType.LEAVE, leaveUrl, null);
+    }
+    roomState = ConnectionState.CLOSED;
+    if (wsClient != null) {
+      wsClient.disconnect(true);
+    }
+  }
+
+  // Helper functions to get connection, post message and leave message URLs
+  private String getConnectionUrl(RoomConnectionParameters connectionParameters) {
+    return connectionParameters.roomUrl + "/" + ROOM_JOIN + "/" + connectionParameters.roomId
+        + getQueryString(connectionParameters);
+  }
+
+  private String getMessageUrl(
+      RoomConnectionParameters connectionParameters, SignalingParameters signalingParameters) {
+    return connectionParameters.roomUrl + "/" + ROOM_MESSAGE + "/" + connectionParameters.roomId
+        + "/" + signalingParameters.clientId + getQueryString(connectionParameters);
+  }
+
+  private String getLeaveUrl(
+      RoomConnectionParameters connectionParameters, SignalingParameters signalingParameters) {
+    return connectionParameters.roomUrl + "/" + ROOM_LEAVE + "/" + connectionParameters.roomId + "/"
+        + signalingParameters.clientId + getQueryString(connectionParameters);
+  }
+
+  private String getQueryString(RoomConnectionParameters connectionParameters) {
+    if (connectionParameters.urlParameters != null) {
+      return "?" + connectionParameters.urlParameters;
+    } else {
+      return "";
+    }
+  }
+
+  // Callback issued when room parameters are extracted. Runs on local
+  // looper thread.
+  private void signalingParametersReady(final SignalingParameters signalingParameters) {
+    Log.d(TAG, "Room connection completed.");
+    if (connectionParameters.loopback
+        && (!signalingParameters.initiator || signalingParameters.offerSdp != null)) {
+      reportError("Loopback room is busy.");
+      return;
+    }
+    if (!connectionParameters.loopback && !signalingParameters.initiator
+        && signalingParameters.offerSdp == null) {
+      Log.w(TAG, "No offer SDP in room response.");
+    }
+    initiator = signalingParameters.initiator;
+    messageUrl = getMessageUrl(connectionParameters, signalingParameters);
+    leaveUrl = getLeaveUrl(connectionParameters, signalingParameters);
+    Log.d(TAG, "Message URL: " + messageUrl);
+    Log.d(TAG, "Leave URL: " + leaveUrl);
+    roomState = ConnectionState.CONNECTED;
+
+    // Fire connection and signaling parameters events.
+    events.onConnectedToRoom(signalingParameters);
+
+    // Connect and register WebSocket client.
+    wsClient.connect(signalingParameters.wssUrl, signalingParameters.wssPostUrl);
+    wsClient.register(connectionParameters.roomId, signalingParameters.clientId);
+  }
+
+  // Send local offer SDP to the other participant.
+  @Override
+  public void sendOfferSdp(final SessionDescription sdp) {
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        if (roomState != ConnectionState.CONNECTED) {
+          reportError("Sending offer SDP in non connected state.");
+          return;
+        }
+        JSONObject json = new JSONObject();
+        jsonPut(json, "sdp", sdp.description);
+        jsonPut(json, "type", "offer");
+        sendPostMessage(MessageType.MESSAGE, messageUrl, json.toString());
+        if (connectionParameters.loopback) {
+          // In loopback mode rename this offer to answer and route it back.
+          SessionDescription sdpAnswer = new SessionDescription(
+              SessionDescription.Type.fromCanonicalForm("answer"), sdp.description);
+          events.onRemoteDescription(sdpAnswer);
+        }
+      }
+    });
+  }
+
+  // Send local answer SDP to the other participant.
+  @Override
+  public void sendAnswerSdp(final SessionDescription sdp) {
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        if (connectionParameters.loopback) {
+          Log.e(TAG, "Sending answer in loopback mode.");
+          return;
+        }
+        JSONObject json = new JSONObject();
+        jsonPut(json, "sdp", sdp.description);
+        jsonPut(json, "type", "answer");
+        wsClient.send(json.toString());
+      }
+    });
+  }
+
+  // Send Ice candidate to the other participant.
+  @Override
+  public void sendLocalIceCandidate(final IceCandidate candidate) {
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        JSONObject json = new JSONObject();
+        jsonPut(json, "type", "candidate");
+        jsonPut(json, "label", candidate.sdpMLineIndex);
+        jsonPut(json, "id", candidate.sdpMid);
+        jsonPut(json, "candidate", candidate.sdp);
+        if (initiator) {
+          // Call initiator sends ice candidates to GAE server.
+          if (roomState != ConnectionState.CONNECTED) {
+            reportError("Sending ICE candidate in non connected state.");
+            return;
+          }
+          sendPostMessage(MessageType.MESSAGE, messageUrl, json.toString());
+          if (connectionParameters.loopback) {
+            events.onRemoteIceCandidate(candidate);
+          }
+        } else {
+          // Call receiver sends ice candidates to websocket server.
+          wsClient.send(json.toString());
+        }
+      }
+    });
+  }
+
+  // Send removed Ice candidates to the other participant.
+  @Override
+  public void sendLocalIceCandidateRemovals(final IceCandidate[] candidates) {
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        JSONObject json = new JSONObject();
+        jsonPut(json, "type", "remove-candidates");
+        JSONArray jsonArray = new JSONArray();
+        for (final IceCandidate candidate : candidates) {
+          jsonArray.put(toJsonCandidate(candidate));
+        }
+        jsonPut(json, "candidates", jsonArray);
+        if (initiator) {
+          // Call initiator sends ice candidates to GAE server.
+          if (roomState != ConnectionState.CONNECTED) {
+            reportError("Sending ICE candidate removals in non connected state.");
+            return;
+          }
+          sendPostMessage(MessageType.MESSAGE, messageUrl, json.toString());
+          if (connectionParameters.loopback) {
+            events.onRemoteIceCandidatesRemoved(candidates);
+          }
+        } else {
+          // Call receiver sends ice candidates to websocket server.
+          wsClient.send(json.toString());
+        }
+      }
+    });
+  }
+
+  // --------------------------------------------------------------------
+  // WebSocketChannelEvents interface implementation.
+  // All events are called by WebSocketChannelClient on a local looper thread
+  // (passed to WebSocket client constructor).
+  @Override
+  public void onWebSocketMessage(final String msg) {
+    if (wsClient.getState() != WebSocketConnectionState.REGISTERED) {
+      Log.e(TAG, "Got WebSocket message in non registered state.");
+      return;
+    }
+    try {
+      JSONObject json = new JSONObject(msg);
+      String msgText = json.getString("msg");
+      String errorText = json.optString("error");
+      if (msgText.length() > 0) {
+        json = new JSONObject(msgText);
+        String type = json.optString("type");
+        if (type.equals("candidate")) {
+          events.onRemoteIceCandidate(toJavaCandidate(json));
+        } else if (type.equals("remove-candidates")) {
+          JSONArray candidateArray = json.getJSONArray("candidates");
+          IceCandidate[] candidates = new IceCandidate[candidateArray.length()];
+          for (int i = 0; i < candidateArray.length(); ++i) {
+            candidates[i] = toJavaCandidate(candidateArray.getJSONObject(i));
+          }
+          events.onRemoteIceCandidatesRemoved(candidates);
+        } else if (type.equals("answer")) {
+          if (initiator) {
+            SessionDescription sdp = new SessionDescription(
+                SessionDescription.Type.fromCanonicalForm(type), json.getString("sdp"));
+            events.onRemoteDescription(sdp);
+          } else {
+            reportError("Received answer for call initiator: " + msg);
+          }
+        } else if (type.equals("offer")) {
+          if (!initiator) {
+            SessionDescription sdp = new SessionDescription(
+                SessionDescription.Type.fromCanonicalForm(type), json.getString("sdp"));
+            events.onRemoteDescription(sdp);
+          } else {
+            reportError("Received offer for call receiver: " + msg);
+          }
+        } else if (type.equals("bye")) {
+          events.onChannelClose();
+        } else {
+          reportError("Unexpected WebSocket message: " + msg);
+        }
+      } else {
+        if (errorText != null && errorText.length() > 0) {
+          reportError("WebSocket error message: " + errorText);
+        } else {
+          reportError("Unexpected WebSocket message: " + msg);
+        }
+      }
+    } catch (JSONException e) {
+      reportError("WebSocket message JSON parsing error: " + e.toString());
+    }
+  }
+
+  @Override
+  public void onWebSocketClose() {
+    events.onChannelClose();
+  }
+
+  @Override
+  public void onWebSocketError(String description) {
+    reportError("WebSocket error: " + description);
+  }
+
+  // --------------------------------------------------------------------
+  // Helper functions.
+  private void reportError(final String errorMessage) {
+    Log.e(TAG, errorMessage);
+    handler.post(new Runnable() {
+      @Override
+      public void run() {
+        if (roomState != ConnectionState.ERROR) {
+          roomState = ConnectionState.ERROR;
+          events.onChannelError(errorMessage);
+        }
+      }
+    });
+  }
+
+  // Put a `key`->`value` mapping in `json`.
+  private static void jsonPut(JSONObject json, String key, Object value) {
+    try {
+      json.put(key, value);
+    } catch (JSONException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  // Send SDP or ICE candidate to a room server.
+  private void sendPostMessage(
+      final MessageType messageType, final String url, @Nullable final String message) {
+    String logInfo = url;
+    if (message != null) {
+      logInfo += ". Message: " + message;
+    }
+    Log.d(TAG, "C->GAE: " + logInfo);
+    AsyncHttpURLConnection httpConnection =
+        new AsyncHttpURLConnection("POST", url, message, new AsyncHttpEvents() {
+          @Override
+          public void onHttpError(String errorMessage) {
+            reportError("GAE POST error: " + errorMessage);
+          }
+
+          @Override
+          public void onHttpComplete(String response) {
+            if (messageType == MessageType.MESSAGE) {
+              try {
+                JSONObject roomJson = new JSONObject(response);
+                String result = roomJson.getString("result");
+                if (!result.equals("SUCCESS")) {
+                  reportError("GAE POST error: " + result);
+                }
+              } catch (JSONException e) {
+                reportError("GAE POST JSON error: " + e.toString());
+              }
+            }
+          }
+        });
+    httpConnection.send();
+  }
+
+  // Converts a Java candidate to a JSONObject.
+  private JSONObject toJsonCandidate(final IceCandidate candidate) {
+    JSONObject json = new JSONObject();
+    jsonPut(json, "label", candidate.sdpMLineIndex);
+    jsonPut(json, "id", candidate.sdpMid);
+    jsonPut(json, "candidate", candidate.sdp);
+    return json;
+  }
+
+  // Converts a JSON candidate to a Java object.
+  IceCandidate toJavaCandidate(JSONObject json) throws JSONException {
+    return new IceCandidate(
+        json.getString("id"), json.getInt("label"), json.getString("candidate"));
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/util/AppRTCUtils.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/util/AppRTCUtils.java
new file mode 100644
index 0000000000..ee7f8c0416
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/util/AppRTCUtils.java
@@ -0,0 +1,47 @@
+/*
+ *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc.util;
+
+import android.os.Build;
+import android.util.Log;
+
+/**
+ * AppRTCUtils provides helper functions for managing thread safety.
+ */
+public final class AppRTCUtils {
+  private AppRTCUtils() {}
+
+  /** Helper method which throws an exception  when an assertion has failed. */
+  public static void assertIsTrue(boolean condition) {
+    if (!condition) {
+      throw new AssertionError("Expected condition to be true");
+    }
+  }
+
+  /** Helper method for building a string of thread information.*/
+  public static String getThreadInfo() {
+    return "@[name=" + Thread.currentThread().getName() + ", id=" + Thread.currentThread().getId()
+        + "]";
+  }
+
+  /** Information about the current build, taken from system properties. */
+  public static void logDeviceInfo(String tag) {
+    Log.d(tag, "Android SDK: " + Build.VERSION.SDK_INT + ", "
+            + "Release: " + Build.VERSION.RELEASE + ", "
+            + "Brand: " + Build.BRAND + ", "
+            + "Device: " + Build.DEVICE + ", "
+            + "Id: " + Build.ID + ", "
+            + "Hardware: " + Build.HARDWARE + ", "
+            + "Manufacturer: " + Build.MANUFACTURER + ", "
+            + "Model: " + Build.MODEL + ", "
+            + "Product: " + Build.PRODUCT);
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/util/AsyncHttpURLConnection.java b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/util/AsyncHttpURLConnection.java
new file mode 100644
index 0000000000..93028ae783
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/src/org/appspot/apprtc/util/AsyncHttpURLConnection.java
@@ -0,0 +1,115 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.appspot.apprtc.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.SocketTimeoutException;
+import java.net.URL;
+import java.util.Scanner;
+
+/**
+ * Asynchronous http requests implementation.
+ */
+public class AsyncHttpURLConnection {
+  private static final int HTTP_TIMEOUT_MS = 8000;
+  private static final String HTTP_ORIGIN = "https://appr.tc";
+  private final String method;
+  private final String url;
+  private final String message;
+  private final AsyncHttpEvents events;
+  private String contentType;
+
+  /**
+   * Http requests callbacks.
+   */
+  public interface AsyncHttpEvents {
+    void onHttpError(String errorMessage);
+    void onHttpComplete(String response);
+  }
+
+  public AsyncHttpURLConnection(String method, String url, String message, AsyncHttpEvents events) {
+    this.method = method;
+    this.url = url;
+    this.message = message;
+    this.events = events;
+  }
+
+  public void setContentType(String contentType) {
+    this.contentType = contentType;
+  }
+
+  public void send() {
+    new Thread(this ::sendHttpMessage).start();
+  }
+
+  @SuppressWarnings("UseNetworkAnnotations")
+  private void sendHttpMessage() {
+    try {
+      HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
+      byte[] postData = new byte[0];
+      if (message != null) {
+        postData = message.getBytes("UTF-8");
+      }
+      connection.setRequestMethod(method);
+      connection.setUseCaches(false);
+      connection.setDoInput(true);
+      connection.setConnectTimeout(HTTP_TIMEOUT_MS);
+      connection.setReadTimeout(HTTP_TIMEOUT_MS);
+      // TODO(glaznev) - query request origin from pref_room_server_url_key preferences.
+      connection.addRequestProperty("origin", HTTP_ORIGIN);
+      boolean doOutput = false;
+      if (method.equals("POST")) {
+        doOutput = true;
+        connection.setDoOutput(true);
+        connection.setFixedLengthStreamingMode(postData.length);
+      }
+      if (contentType == null) {
+        connection.setRequestProperty("Content-Type", "text/plain; charset=utf-8");
+      } else {
+        connection.setRequestProperty("Content-Type", contentType);
+      }
+
+      // Send POST request.
+      if (doOutput && postData.length > 0) {
+        OutputStream outStream = connection.getOutputStream();
+        outStream.write(postData);
+        outStream.close();
+      }
+
+      // Get response.
+      int responseCode = connection.getResponseCode();
+      if (responseCode != 200) {
+        events.onHttpError("Non-200 response to " + method + " to URL: " + url + " : "
+            + connection.getHeaderField(null));
+        connection.disconnect();
+        return;
+      }
+      InputStream responseStream = connection.getInputStream();
+      String response = drainStream(responseStream);
+      responseStream.close();
+      connection.disconnect();
+      events.onHttpComplete(response);
+    } catch (SocketTimeoutException e) {
+      events.onHttpError("HTTP " + method + " to " + url + " timeout");
+    } catch (IOException e) {
+      events.onHttpError("HTTP " + method + " to " + url + " error: " + e.getMessage());
+    }
+  }
+
+  // Return the contents of an InputStream as a String.
+  private static String drainStream(InputStream in) {
+    Scanner s = new Scanner(in, "UTF-8").useDelimiter("\\A");
+    return s.hasNext() ? s.next() : "";
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/start_loopback_stubbed_camera_saved_video_out.py b/third_party/libwebrtc/examples/androidapp/start_loopback_stubbed_camera_saved_video_out.py
new file mode 100644
index 0000000000..b1cf84611f
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/start_loopback_stubbed_camera_saved_video_out.py
@@ -0,0 +1,127 @@
+# Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+from optparse import OptionParser
+import random
+import string
+import subprocess
+import sys
+import time
+
+from com.android.monkeyrunner import MonkeyRunner, MonkeyDevice
+
+
+def main():
+    parser = OptionParser()
+
+    parser.add_option('--devname', dest='devname', help='The device id')
+
+    parser.add_option(
+        '--videooutsave',
+        dest='videooutsave',
+        help='The path where to save the video out file on local computer')
+
+    parser.add_option('--videoout',
+                      dest='videoout',
+                      help='The path where to put the video out file')
+
+    parser.add_option('--videoout_width',
+                      dest='videoout_width',
+                      type='int',
+                      help='The width for the video out file')
+
+    parser.add_option('--videoout_height',
+                      dest='videoout_height',
+                      type='int',
+                      help='The height for the video out file')
+
+    parser.add_option(
+        '--videoin',
+        dest='videoin',
+        help='The path where to read input file instead of camera')
+
+    parser.add_option('--call_length',
+                      dest='call_length',
+                      type='int',
+                      help='The length of the call')
+
+    (options, args) = parser.parse_args()
+
+    print(options, args)
+
+    devname = options.devname
+
+    videoin = options.videoin
+
+    videoout = options.videoout
+    videoout_width = options.videoout_width
+    videoout_height = options.videoout_height
+
+    videooutsave = options.videooutsave
+
+    call_length = options.call_length or 10
+
+    room = ''.join(
+        random.choice(string.ascii_letters + string.digits) for _ in range(8))
+
+    # Delete output video file.
+    if videoout:
+        subprocess.check_call(
+            ['adb', '-s', devname, 'shell', 'rm', '-f', videoout])
+
+    device = MonkeyRunner.waitForConnection(2, devname)
+
+    extras = {
+        'org.appspot.apprtc.USE_VALUES_FROM_INTENT': True,
+        'org.appspot.apprtc.AUDIOCODEC': 'OPUS',
+        'org.appspot.apprtc.LOOPBACK': True,
+        'org.appspot.apprtc.VIDEOCODEC': 'VP8',
+        'org.appspot.apprtc.CAPTURETOTEXTURE': False,
+        'org.appspot.apprtc.CAMERA2': False,
+        'org.appspot.apprtc.ROOMID': room
+    }
+
+    if videoin:
+        extras.update({'org.appspot.apprtc.VIDEO_FILE_AS_CAMERA': videoin})
+
+    if videoout:
+        extras.update({
+            'org.appspot.apprtc.SAVE_REMOTE_VIDEO_TO_FILE':
+            videoout,
+            'org.appspot.apprtc.SAVE_REMOTE_VIDEO_TO_FILE_WIDTH':
+            videoout_width,
+            'org.appspot.apprtc.SAVE_REMOTE_VIDEO_TO_FILE_HEIGHT':
+            videoout_height
+        })
+
+    print extras
+
+    device.startActivity(data='https://appr.tc',
+                         action='android.intent.action.VIEW',
+                         component='org.appspot.apprtc/.ConnectActivity',
+                         extras=extras)
+
+    print 'Running a call for %d seconds' % call_length
+    for _ in xrange(call_length):
+        sys.stdout.write('.')
+        sys.stdout.flush()
+        time.sleep(1)
+    print '\nEnding call.'
+
+    # Press back to end the call. Will end on both sides.
+    device.press('KEYCODE_BACK', MonkeyDevice.DOWN_AND_UP)
+
+    if videooutsave:
+        time.sleep(2)
+
+        subprocess.check_call(
+            ['adb', '-s', devname, 'pull', videoout, videooutsave])
+
+
+if __name__ == '__main__':
+    main()
diff --git a/third_party/libwebrtc/examples/androidapp/third_party/autobanh/BUILD.gn b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/BUILD.gn
new file mode 100644
index 0000000000..b671239bae
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/BUILD.gn
@@ -0,0 +1,15 @@
+# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+if (is_android) {
+  import("//build/config/android/rules.gni")
+
+  android_java_prebuilt("autobanh_java") {
+    jar_path = "lib/autobanh.jar"
+  }
+}
diff --git a/third_party/libwebrtc/examples/androidapp/third_party/autobanh/LICENSE b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/LICENSE
new file mode 100644
index 0000000000..f433b1a53f
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/LICENSE
@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      communication on electronic mailing lists, source code control systems,
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+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+   4. Redistribution. You may reproduce and distribute copies of the
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+
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+          that You distribute, all copyright, patent, trademark, and
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+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
diff --git a/third_party/libwebrtc/examples/androidapp/third_party/autobanh/LICENSE.md b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/LICENSE.md
new file mode 100644
index 0000000000..2079e90d6b
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/LICENSE.md
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Cameron Lowell Palmer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/third_party/libwebrtc/examples/androidapp/third_party/autobanh/NOTICE b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/NOTICE
new file mode 100644
index 0000000000..91ed7dfe0e
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/NOTICE
@@ -0,0 +1,3 @@
+AutobahnAndroid
+Copyright 2011,2012 Tavendo GmbH. Licensed under Apache 2.0
+This product includes software developed at Tavendo GmbH http://www.tavendo.de
diff --git a/third_party/libwebrtc/examples/androidapp/third_party/autobanh/lib/autobanh.jar b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/lib/autobanh.jar
new file mode 100644
index 0000000000..5a10b7f3f1
--- /dev/null
+++ b/third_party/libwebrtc/examples/androidapp/third_party/autobanh/lib/autobanh.jar