[Enhancement]Implement reworked audio pipeline #55
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- api/peer_connection_interface.h:1564 adds a standalone_audio_source boolean (defaulting to false) to CreateAudioSource, preserving existing call sites but enabling downstream selection of alternate audio pipelines. - pc/peer_connection_factory.h:76 & pc/peer_connection_factory.cc:200 now accept/forward the flag, with an RTC_DCHECK guarding the yet-to-be-implemented standalone path so behavior stays unchanged. - pc/peer_connection_factory_proxy.h:46 and api/test/mock_peer_connection_factory_interface.h:58 propagate the extra argument through the proxy layer and gMock facade to keep tests and thread marshaling in sync. - sdk/objc/api/peerconnection/RTCPeerConnectionFactory.h:90 & .mm:368-385 expose audioSourceWithConstraints:standalone: on the ObjC API, wiring the new boolean straight to the native factory without touching AudioOptions or media constraints.
- Added the native StandaloneAudioTrackSource implementation (sdk/objc/native/src/standalone_audio_track_source.{h,cc}) plus focused unit coverage (…_unittest.cc). The source keeps start/stop state, fans frames to registered sinks, and exposes a scoped CreateSendStream helper; the test confirms frame delivery, ignores pushes before start, and verifies sink removal. - sdk/BUILD.gn:1908 now only exposes a minimal standalone_audio_track_source library with the direct dependencies it needs and, behind rtc_include_tests, the companion XCTest bundle—no other GN changes remain after your revert. - Formatted the new sources with clang-format and ran the required bundle exec fastlane ios build … flow, which completed successfully - Introduced RTCAudioFrame (sdk/objc/api/peerconnection/RTCAudioFrame.h, .mm) to wrap raw 16-bit PCM payloads along with metadata (sample rate, channels, frame count, timestamps) for Objective-C callers. - Added RTCStandaloneAudioSource (sdk/objc/api/peerconnection/RTCStandaloneAudioSource.h, .mm, plus RTCStandaloneAudioSource+Private.h) to build on RTCAudioSource, own the native StandaloneAudioTrackSource, expose start/stop, and forward RTCAudioFrame data through PushAudioFrame. - Updated sdk/BUILD.gn:1042,1208,1473 so the new bridge files are compiled, the umbrella exports the headers, and the ObjC peerconnection library links our existing native standalone_audio_track_source target.
- Added StandaloneAudioSendHelper (sdk/objc/native/src/standalone_audio_send_helper.h, .cc) to own the per-source AudioSendStream, expose voe::ChannelSendInterface/RtpRtcpInterface, and tear it down safely with RAII. - Hooked StandaloneAudioTrackSource::CreateSendStream to return the new helper (sdk/objc/native/src/standalone_audio_track_source.h, .cc), keeping existing frame push logic intact. - Expanded the unit test suite with StandaloneAudioSendHelperTest, building a minimal Call/AudioState scaffold and verifying the helper returns valid stream, channel, and RTP handles (sdk/objc/native/src/standalone_audio_track_source_unittest.cc). - Updated GN wiring so both the helper and test compile and link with the needed call/audio-mixer/device components (sdk/BUILD.gn).
- Updated the factory branching so PeerConnectionFactory::CreateAudioSource now returns StandaloneAudioTrackSource when the standalone flag is set on iOS, while leaving other platforms on the legacy path (pc/peer_connection_factory.cc:204). - Wired the ObjC factory to import the standalone bridge, detect standalone requests, and wrap the returned native source in RTCStandaloneAudioSource, including a safe cast to the native implementation (sdk/objc/api/peerconnection/RTCPeerConnectionFactory.mm:11, sdk/objc/api/peerconnection/RTCPeerConnectionFactory.mm:386). - Added a private initializer so RTCStandaloneAudioSource can take an existing native standalone source, and refactored the designated initializer to share that path (sdk/objc/api/peerconnection/RTCStandaloneAudioSource+Private.h:27, sdk/objc/api/peerconnection/RTCStandaloneAudioSource.mm:36). - Taught the GN target to pull in the standalone audio source library when building for iOS, satisfying the new dependency (pc/BUILD.gn:1577).
… preserving the legacy AudioTransportImpl path; add tests covering both source types. Run the Fastlane command afterward. - Added AudioSourceInterface::is_standalone() and implemented it in the iOS standalone source so we can detect standalone producers without RTTI (api/media_stream_interface.h:266-273, sdk/objc/native/src/standalone_audio_track_source.h:42-56). - On iOS the audio sender now swaps to a StandaloneAudioFrameForwarder that pushes 10 ms PCM straight into the per-SSRC AudioSendStream, while legacy sources continue through the existing sink adapter (pc/rtp_sender.h:343-441, pc/rtp_sender.cc:680-744, pc/rtp_sender.cc:819-965). - Voice-channel plumbing exposes GetAudioSendStream and the fake call gains a send-frame counter, letting the standalone path drive real streams in both production and tests (media/base/media_channel.h:889-903, media/base/fake_media_engine.cc:277-349, media/engine/webrtc_voice_engine.cc:867-1874, media/engine/fake_webrtc_call.h:74-117). - RtpSenderReceiver tests now accept arbitrary audio sources and include an iOS-only regression that pushes PCM through StandaloneAudioTrackSource, asserting the fake send stream records delivery (pc/rtp_sender_receiver_unittest.cc:195-210, pc/rtp_sender_receiver_unittest.cc:345-357, pc/rtp_sender_receiver_unittest.cc:602-626).
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