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

content/renderer/media/webrtc/media_stream_remote_audio_track.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_MEDIA_STREAM_REMOTE_AUDIO_TRACK_H_
+#define CONTENT_RENDERER_MEDIA_WEBRTC_MEDIA_STREAM_REMOTE_AUDIO_TRACK_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/threading/thread_checker.h"
+#include "content/renderer/media/media_stream_audio_track.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+
+namespace content {
+
+class MediaStreamRemoteAudioSource;
+
+// MediaStreamRemoteAudioTrack is a WebRTC specific implementation of an
+// audio track received from a PeerConnection.
+// TODO(tommi): Chrome shouldn't have to care about remote vs local so
+// we should have a single track implementation that delegates to the
+// sources that do different things depending on the type of source.
+class MediaStreamRemoteAudioTrack : public MediaStreamAudioTrack {
+ public:
+  explicit MediaStreamRemoteAudioTrack(
+      const blink::WebMediaStreamSource& source, bool enabled);
+  ~MediaStreamRemoteAudioTrack() override;
+
+  // MediaStreamTrack override.
+  void SetEnabled(bool enabled) override;
+
+  // MediaStreamAudioTrack overrides.
+  void AddSink(MediaStreamAudioSink* sink) override;
+  void RemoveSink(MediaStreamAudioSink* sink) override;
+  media::AudioParameters GetOutputFormat() const override;
+
+  webrtc::AudioTrackInterface* GetAudioAdapter() override;
+
+ private:
+  // MediaStreamAudioTrack override.
+  void OnStop() final;
+
+  MediaStreamRemoteAudioSource* source() const;
+
+  blink::WebMediaStreamSource source_;
+  bool enabled_;
+};
+
+// Inheriting from ExtraData directly since MediaStreamAudioSource has
+// too much unrelated bloat.
+// TODO(tommi): MediaStreamAudioSource needs refactoring.
+// TODO(miu): On it!  ;-)
+class MediaStreamRemoteAudioSource
+    : public blink::WebMediaStreamSource::ExtraData {
+ public:
+  explicit MediaStreamRemoteAudioSource(
+      const scoped_refptr<webrtc::AudioTrackInterface>& track);
+  ~MediaStreamRemoteAudioSource() override;
+
+  // Controls whether or not the source is included in the main, mixed, audio
+  // output from WebRTC as rendered by WebRtcAudioRenderer (media players).
+  void SetEnabledForMixing(bool enabled);
+
+  // Adds an audio sink for a track belonging to this source.
+  // |enabled| is the enabled state of the track and can be updated via
+  // a call to SetSinksEnabled.
+  void AddSink(MediaStreamAudioSink* sink, MediaStreamAudioTrack* track,
+               bool enabled);
+
+  // Removes an audio sink for a track belonging to this source.
+  void RemoveSink(MediaStreamAudioSink* sink, MediaStreamAudioTrack* track);
+
+  // Turns audio callbacks on/off for all sinks belonging to a track.
+  void SetSinksEnabled(MediaStreamAudioTrack* track, bool enabled);
+
+  // Removes all sinks belonging to a track.
+  void RemoveAll(MediaStreamAudioTrack* track);
+
+  webrtc::AudioTrackInterface* GetAudioAdapter();
+
+ private:
+  class AudioSink;
+  std::unique_ptr<AudioSink> sink_;
+  const scoped_refptr<webrtc::AudioTrackInterface> track_;
+  base::ThreadChecker thread_checker_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_WEBRTC_MEDIA_STREAM_REMOTE_AUDIO_TRACK_H_