Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

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+<!-- go/cmark -->
+<!--* freshness: {owner: 'henrika' reviewed: '2021-04-12'} *-->
+
+# Audio Device Module (ADM)
+
+## Overview
+
+The ADM is responsible for driving input (microphone) and output (speaker) audio
+in WebRTC and the API is defined in [audio_device.h][19].
+
+Main functions of the ADM are:
+
+*   Initialization and termination of native audio libraries.
+*   Registration of an [AudioTransport object][16] which handles audio callbacks
+    for audio in both directions.
+*   Device enumeration and selection (only for Linux, Windows and Mac OSX).
+*   Start/Stop physical audio streams:
+    *   Recording audio from the selected microphone, and
+    *   playing out audio on the selected speaker.
+*   Level control of the active audio streams.
+*   Control of built-in audio effects (Audio Echo Cancelation (AEC), Audio Gain
+    Control (AGC) and Noise Suppression (NS)) for Android and iOS.
+
+ADM implementations reside at two different locations in the WebRTC repository:
+`/modules/audio_device/` and `/sdk/`. The latest implementations for [iOS][20]
+and [Android][21] can be found under `/sdk/`. `/modules/audio_device/` contains
+older versions for mobile platforms and also implementations for desktop
+platforms such as [Linux][22], [Windows][23] and [Mac OSX][24]. This document is
+focusing on the parts in `/modules/audio_device/` but implementation specific
+details such as threading models are omitted to keep the descriptions as simple
+as possible.
+
+By default, the ADM in WebRTC is created in [`WebRtcVoiceEngine::Init`][1] but
+an external implementation can also be injected using
+[`rtc::CreatePeerConnectionFactory`][25]. An example of where an external ADM is
+injected can be found in [PeerConnectionInterfaceTest][26] where a so-called
+[fake ADM][29] is utilized to avoid hardware dependency in a gtest. Clients can
+also inject their own ADMs in situations where functionality is needed that is
+not provided by the default implementations.
+
+## Background
+
+This section contains a historical background of the ADM API.
+
+The ADM interface is old and has undergone many changes over the years. It used
+to be much more granular but it still contains more than 50 methods and is
+implemented on several different hardware platforms.
+
+Some APIs are not implemented on all platforms, and functionality can be spread
+out differently between the methods.
+
+The most up-to-date implementations of the ADM interface are for [iOS][27] and
+for [Android][28].
+
+Desktop version are not updated to comply with the latest
+[C++ style guide](https://chromium.googlesource.com/chromium/src/+/main/styleguide/c++/c++.md)
+and more work is also needed to improve the performance and stability of these
+versions.
+
+## WebRtcVoiceEngine
+
+[`WebRtcVoiceEngine`][2] does not utilize all methods of the ADM but it still
+serves as the best example of its architecture and how to use it. For a more
+detailed view of all methods in the ADM interface, see [ADM unit tests][3].
+
+Assuming that an external ADM implementation is not injected, a default - or
+internal - ADM is created in [`WebRtcVoiceEngine::Init`][1] using
+[`AudioDeviceModule::Create`][4].
+
+Basic initialization is done using a utility method called
+[`adm_helpers::Init`][5] which calls fundamental ADM APIs like:
+
+*   [`AudiDeviceModule::Init`][6] - initializes the native audio parts required
+    for each platform.
+*   [`AudiDeviceModule::SetPlayoutDevice`][7] - specifies which speaker to use
+    for playing out audio using an `index` retrieved by the corresponding
+    enumeration method [`AudiDeviceModule::PlayoutDeviceName`][8].
+*   [`AudiDeviceModule::SetRecordingDevice`][9] - specifies which microphone to
+    use for recording audio using an `index` retrieved by the corresponding
+    enumeration method which is [`AudiDeviceModule::RecordingDeviceName`][10].
+*   [`AudiDeviceModule::InitSpeaker`][11] - sets up the parts of the ADM needed
+    to use the selected output device.
+*   [`AudiDeviceModule::InitMicrophone`][12] - sets up the parts of the ADM
+    needed to use the selected input device.
+*   [`AudiDeviceModule::SetStereoPlayout`][13] - enables playout in stereo if
+    the selected audio device supports it.
+*   [`AudiDeviceModule::SetStereoRecording`][14] - enables recording in stereo
+    if the selected audio device supports it.
+
+[`WebRtcVoiceEngine::Init`][1] also calls
+[`AudiDeviceModule::RegisterAudioTransport`][15] to register an existing
+[AudioTransport][16] implementation which handles audio callbacks in both
+directions and therefore serves as the bridge between the native ADM and the
+upper WebRTC layers.
+
+Recorded audio samples are delivered from the ADM to the `WebRtcVoiceEngine`
+(who owns the `AudioTransport` object) via
+[`AudioTransport::RecordedDataIsAvailable`][17]:
+
+```
+int32_t RecordedDataIsAvailable(const void* audioSamples, size_t nSamples, size_t nBytesPerSample,
+                                size_t nChannels, uint32_t samplesPerSec, uint32_t totalDelayMS,
+                                int32_t clockDrift, uint32_t currentMicLevel, bool keyPressed,
+                                uint32_t& newMicLevel)
+```
+
+Decoded audio samples ready to be played out are are delivered by the
+`WebRtcVoiceEngine` to the ADM, via [`AudioTransport::NeedMorePlayoutData`][18]:
+
+```
+int32_t NeedMorePlayData(size_t nSamples, size_t nBytesPerSample, size_t nChannels, int32_t samplesPerSec,
+                         void* audioSamples, size_t& nSamplesOut,
+                         int64_t* elapsed_time_ms, int64_t* ntp_time_ms)
+```
+
+Audio samples are 16-bit [linear PCM](https://wiki.multimedia.cx/index.php/PCM)
+using regular interleaving of channels within each sample.
+
+`WebRtcVoiceEngine` also owns an [`AudioState`][30] member and this class is
+used has helper to start and stop audio to and from the ADM. To initialize and
+start recording, it calls:
+
+*   [`AudiDeviceModule::InitRecording`][31]
+*   [`AudiDeviceModule::StartRecording`][32]
+
+and to initialize and start playout:
+
+*   [`AudiDeviceModule::InitPlayout`][33]
+*   [`AudiDeviceModule::StartPlayout`][34]
+
+Finally, the corresponding stop methods [`AudiDeviceModule::StopRecording`][35]
+and [`AudiDeviceModule::StopPlayout`][36] are called followed by
+[`AudiDeviceModule::Terminate`][37].
+
+[1]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/media/engine/webrtc_voice_engine.cc;l=314;drc=f7b1b95f11c74cb5369fdd528b73c70a50f2e206
+[2]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/media/engine/webrtc_voice_engine.h;l=48;drc=d15a575ec3528c252419149d35977e55269d8a41
+[3]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/audio_device_unittest.cc;l=1;drc=d15a575ec3528c252419149d35977e55269d8a41
+[4]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=46;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e
+[5]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/media/engine/adm_helpers.h;drc=2222a80e79ae1ef5cb9510ec51d3868be75f47a2
+[6]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=62;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[7]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=77;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[8]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=69;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[9]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=79;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[10]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=72;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[11]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=99;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[12]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=101;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[13]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=130;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[14]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=133;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[15]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=59;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[16]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device_defines.h;l=34;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[17]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device_defines.h;l=36;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[18]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device_defines.h;l=48;drc=9438fb3fff97c803d1ead34c0e4f223db168526f
+[19]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738es
+[20]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/sdk/objc/native/api/audio_device_module.h;drc=76443eafa9375374d9f1d23da2b913f2acac6ac2
+[21]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/sdk/android/src/jni/audio_device/audio_device_module.h;drc=bbeb10925eb106eeed6143ccf571bc438ec22ce1
+[22]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/linux/;drc=d15a575ec3528c252419149d35977e55269d8a41
+[23]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/win/;drc=d15a575ec3528c252419149d35977e55269d8a41
+[24]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/mac/;drc=3b68aa346a5d3483c3448852d19d91723846825c
+[25]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/api/create_peerconnection_factory.h;l=45;drc=09ceed2165137c4bea4e02e8d3db31970d0bf273
+[26]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/pc/peer_connection_interface_unittest.cc;l=692;drc=2efb8a5ec61b1b87475d046c03d20244f53b14b6
+[27]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/sdk/objc/native/api/audio_device_module.h;drc=76443eafa9375374d9f1d23da2b913f2acac6ac2
+[28]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/sdk/android/src/jni/audio_device/audio_device_module.h;drc=bbeb10925eb106eeed6143ccf571bc438ec22ce1
+[29]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/pc/test/fake_audio_capture_module.h;l=42;drc=d15a575ec3528c252419149d35977e55269d8a41
+[30]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/audio/audio_state.h;drc=d15a575ec3528c252419149d35977e55269d8a41
+[31]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=87;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e
+[32]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=94;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e
+[33]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=84;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e
+[34]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=91;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e
+[35]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=95;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e
+[36]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=92;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e
+[37]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/audio_device/include/audio_device.h;l=63;drc=eb8c4ca608486add9800f6bfb7a8ba3cf23e738e