Revert of MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/media/webrtc/peer_connection_remote_audio_source.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_RENDERER_MEDIA_WEBRTC_PEER_CONNECTION_REMOTE_AUDIO_SOURCE_H_
-#define CONTENT_RENDERER_MEDIA_WEBRTC_PEER_CONNECTION_REMOTE_AUDIO_SOURCE_H_
-
-#include <memory>
-
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/lock.h"
-#include "content/renderer/media/media_stream_audio_source.h"
-#include "content/renderer/media/media_stream_audio_track.h"
-#include "third_party/webrtc/api/mediastreaminterface.h"
-
-namespace media {
-class AudioBus;
-}
-
-namespace content {
-
-// PeerConnectionRemoteAudioTrack is a WebRTC specific implementation of an
-// audio track whose data is sourced from a PeerConnection.
-class PeerConnectionRemoteAudioTrack final
-    : NON_EXPORTED_BASE(public MediaStreamAudioTrack) {
- public:
-  explicit PeerConnectionRemoteAudioTrack(
-      scoped_refptr<webrtc::AudioTrackInterface> track_interface);
-  ~PeerConnectionRemoteAudioTrack() final;
-
-  // If |track| is an instance of PeerConnectionRemoteAudioTrack, return a
-  // type-casted pointer to it. Otherwise, return null.
-  static PeerConnectionRemoteAudioTrack* From(MediaStreamAudioTrack* track);
-
-  webrtc::AudioTrackInterface* track_interface() const {
-    return track_interface_.get();
-  }
-
-  // MediaStreamAudioTrack override.
-  void SetEnabled(bool enabled) override;
-
- private:
-  // MediaStreamAudioTrack overrides.
-  void* GetClassIdentifier() const final;
-
-  const scoped_refptr<webrtc::AudioTrackInterface> track_interface_;
-
-  // In debug builds, check that all methods that could cause object graph
-  // or data flow changes are being called on the main thread.
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(PeerConnectionRemoteAudioTrack);
-};
-
-// Represents the audio provided by the receiving end of a PeerConnection.
-class PeerConnectionRemoteAudioSource final
-    : NON_EXPORTED_BASE(public MediaStreamAudioSource),
-      NON_EXPORTED_BASE(protected webrtc::AudioTrackSinkInterface) {
- public:
-  explicit PeerConnectionRemoteAudioSource(
-      scoped_refptr<webrtc::AudioTrackInterface> track_interface);
-  ~PeerConnectionRemoteAudioSource() final;
-
- protected:
-  // MediaStreamAudioSource implementation.
-  std::unique_ptr<MediaStreamAudioTrack> CreateMediaStreamAudioTrack(
-      const std::string& id) final;
-  bool EnsureSourceIsStarted() final;
-  void EnsureSourceIsStopped() final;
-
-  // webrtc::AudioTrackSinkInterface implementation.
-  void OnData(const void* audio_data, int bits_per_sample, int sample_rate,
-              size_t number_of_channels, size_t number_of_frames) final;
-
- private:
-  // Interface to the implementation that calls OnData().
-  const scoped_refptr<webrtc::AudioTrackInterface> track_interface_;
-
-  // In debug builds, check that all methods that could cause object graph
-  // or data flow changes are being called on the main thread.
-  base::ThreadChecker thread_checker_;
-
-  // True if |this| is receiving an audio flow as a sink of the remote
-  // PeerConnection via |track_interface_|.
-  bool is_sink_of_peer_connection_;
-
-  // Buffer for converting from interleaved signed-integer PCM samples to the
-  // planar float format. Only used on the thread that calls OnData().
-  std::unique_ptr<media::AudioBus> audio_bus_;
-
-  // In debug builds, use a "try lock" to sanity-check that there are no
-  // concurrent calls to OnData(). See notes in OnData() implementation.
-#ifndef NDEBUG
-  base::Lock single_audio_thread_guard_;
-#endif
-
-  DISALLOW_COPY_AND_ASSIGN(PeerConnectionRemoteAudioSource);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_WEBRTC_PEER_CONNECTION_REMOTE_AUDIO_SOURCE_H_