1 files changed, 166 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/AudioCapabilitiesReceiver.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/AudioCapabilitiesReceiver.java
new file mode 100644
index 0000000000..d96fd32f53
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/AudioCapabilitiesReceiver.java
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.mozilla.thirdparty.com.google.android.exoplayer2.audio;
+
+import android.content.BroadcastReceiver;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.database.ContentObserver;
+import android.media.AudioManager;
+import android.net.Uri;
+import android.os.Handler;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
+
+/**
+ * Receives broadcast events indicating changes to the device's audio capabilities, notifying a
+ * {@link Listener} when audio capability changes occur.
+ */
+public final class AudioCapabilitiesReceiver {
+
+  /**
+   * Listener notified when audio capabilities change.
+   */
+  public interface Listener {
+
+    /**
+     * Called when the audio capabilities change.
+     *
+     * @param audioCapabilities The current audio capabilities for the device.
+     */
+    void onAudioCapabilitiesChanged(AudioCapabilities audioCapabilities);
+
+  }
+
+  private final Context context;
+  private final Listener listener;
+  private final Handler handler;
+  @Nullable private final BroadcastReceiver receiver;
+  @Nullable private final ExternalSurroundSoundSettingObserver externalSurroundSoundSettingObserver;
+
+  /* package */ @Nullable AudioCapabilities audioCapabilities;
+  private boolean registered;
+
+  /**
+   * @param context A context for registering the receiver.
+   * @param listener The listener to notify when audio capabilities change.
+   */
+  public AudioCapabilitiesReceiver(Context context, Listener listener) {
+    context = context.getApplicationContext();
+    this.context = context;
+    this.listener = Assertions.checkNotNull(listener);
+    handler = new Handler(Util.getLooper());
+    receiver = Util.SDK_INT >= 21 ? new HdmiAudioPlugBroadcastReceiver() : null;
+    Uri externalSurroundSoundUri = AudioCapabilities.getExternalSurroundSoundGlobalSettingUri();
+    externalSurroundSoundSettingObserver =
+        externalSurroundSoundUri != null
+            ? new ExternalSurroundSoundSettingObserver(
+                handler, context.getContentResolver(), externalSurroundSoundUri)
+            : null;
+  }
+
+  /**
+   * Registers the receiver, meaning it will notify the listener when audio capability changes
+   * occur. The current audio capabilities will be returned. It is important to call
+   * {@link #unregister} when the receiver is no longer required.
+   *
+   * @return The current audio capabilities for the device.
+   */
+  @SuppressWarnings("InlinedApi")
+  public AudioCapabilities register() {
+    if (registered) {
+      return Assertions.checkNotNull(audioCapabilities);
+    }
+    registered = true;
+    if (externalSurroundSoundSettingObserver != null) {
+      externalSurroundSoundSettingObserver.register();
+    }
+    Intent stickyIntent = null;
+    if (receiver != null) {
+      IntentFilter intentFilter = new IntentFilter(AudioManager.ACTION_HDMI_AUDIO_PLUG);
+      stickyIntent =
+          context.registerReceiver(
+              receiver, intentFilter, /* broadcastPermission= */ null, handler);
+    }
+    audioCapabilities = AudioCapabilities.getCapabilities(context, stickyIntent);
+    return audioCapabilities;
+  }
+
+  /**
+   * Unregisters the receiver, meaning it will no longer notify the listener when audio capability
+   * changes occur.
+   */
+  public void unregister() {
+    if (!registered) {
+      return;
+    }
+    audioCapabilities = null;
+    if (receiver != null) {
+      context.unregisterReceiver(receiver);
+    }
+    if (externalSurroundSoundSettingObserver != null) {
+      externalSurroundSoundSettingObserver.unregister();
+    }
+    registered = false;
+  }
+
+  private void onNewAudioCapabilities(AudioCapabilities newAudioCapabilities) {
+    if (registered && !newAudioCapabilities.equals(audioCapabilities)) {
+      audioCapabilities = newAudioCapabilities;
+      listener.onAudioCapabilitiesChanged(newAudioCapabilities);
+    }
+  }
+
+  private final class HdmiAudioPlugBroadcastReceiver extends BroadcastReceiver {
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+      if (!isInitialStickyBroadcast()) {
+        onNewAudioCapabilities(AudioCapabilities.getCapabilities(context, intent));
+      }
+    }
+  }
+
+  private final class ExternalSurroundSoundSettingObserver extends ContentObserver {
+
+    private final ContentResolver resolver;
+    private final Uri settingUri;
+
+    public ExternalSurroundSoundSettingObserver(
+        Handler handler, ContentResolver resolver, Uri settingUri) {
+      super(handler);
+      this.resolver = resolver;
+      this.settingUri = settingUri;
+    }
+
+    public void register() {
+      resolver.registerContentObserver(settingUri, /* notifyForDescendants= */ false, this);
+    }
+
+    public void unregister() {
+      resolver.unregisterContentObserver(this);
+    }
+
+    @Override
+    public void onChange(boolean selfChange) {
+      onNewAudioCapabilities(AudioCapabilities.getCapabilities(context));
+    }
+  }
+
+}