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

content/renderer/media/webrtc_local_audio_track.h

Index: content/renderer/media/webrtc_local_audio_track.h
diff --git a/content/renderer/media/webrtc_local_audio_track.h b/content/renderer/media/webrtc_local_audio_track.h
new file mode 100644
index 0000000000000000000000000000000000000000..1c88465d51eee729079c5019e3fc8cbdca322357
--- /dev/null
+++ b/content/renderer/media/webrtc_local_audio_track.h
@@ -0,0 +1,106 @@
+// Copyright 2013 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_LOCAL_AUDIO_TRACK_H_
+#define CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_TRACK_H_
+
+#include <list>
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/synchronization/lock.h"
+#include "base/threading/thread_checker.h"
+#include "content/renderer/media/media_stream_audio_track.h"
+#include "content/renderer/media/tagged_list.h"
+#include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
+#include "media/base/audio_parameters.h"
+
+namespace media {
+class AudioBus;
+}
+
+namespace content {
+
+class MediaStreamAudioLevelCalculator;
+class MediaStreamAudioProcessor;
+class MediaStreamAudioSink;
+class MediaStreamAudioSinkOwner;
+class MediaStreamAudioTrackSink;
+
+// A WebRtcLocalAudioTrack manages thread-safe connects/disconnects to sinks,
+// and the delivery of audio data from the source to the sinks.
+class CONTENT_EXPORT WebRtcLocalAudioTrack
+    : NON_EXPORTED_BASE(public MediaStreamAudioTrack) {
+ public:
+  explicit WebRtcLocalAudioTrack(
+      scoped_refptr<WebRtcLocalAudioTrackAdapter> adapter);
+
+  ~WebRtcLocalAudioTrack() override;
+
+  // Add a sink to the track. This function will trigger a OnSetFormat()
+  // call on the |sink|.
+  // Called on the main render thread.
+  void AddSink(MediaStreamAudioSink* sink) override;
+
+  // Remove a sink from the track.
+  // Called on the main render thread.
+  void RemoveSink(MediaStreamAudioSink* sink) override;
+
+  // Overrides for MediaStreamTrack.
+  void SetEnabled(bool enabled) override;
+  webrtc::AudioTrackInterface* GetAudioAdapter() override;
+  media::AudioParameters GetOutputFormat() const override;
+
+  // Method called by the capturer to deliver the capture data.
+  // Called on the capture audio thread.
+  void Capture(const media::AudioBus& audio_bus,
+               base::TimeTicks estimated_capture_time);
+
+  // Method called by the capturer to set the audio parameters used by source
+  // of the capture data..
+  // Called on the capture audio thread.
+  void OnSetFormat(const media::AudioParameters& params);
+
+  // Called by the capturer before the audio data flow begins to set the object
+  // that provides shared access to the current audio signal level.
+  void SetLevel(scoped_refptr<MediaStreamAudioLevelCalculator::Level> level);
+
+  // Called by the capturer before the audio data flow begins to provide a
+  // reference to the audio processor so that the track can query stats from it.
+  void SetAudioProcessor(scoped_refptr<MediaStreamAudioProcessor> processor);
+
+ private:
+  typedef TaggedList<MediaStreamAudioTrackSink> SinkList;
+
+  // MediaStreamAudioTrack override.
+  void OnStop() final;
+
+  // All usage of libjingle is through this adapter. The adapter holds
+  // a pointer to this object, but no reference.
+  const scoped_refptr<WebRtcLocalAudioTrackAdapter> adapter_;
+
+  // A tagged list of sinks that the audio data is fed to. Tags
+  // indicate tracks that need to be notified that the audio format
+  // has changed.
+  SinkList sinks_;
+
+  // Tests that methods are called on libjingle's signaling thread.
+  base::ThreadChecker signal_thread_checker_;
+
+  // Used to DCHECK that some methods are called on the capture audio thread.
+  base::ThreadChecker capture_thread_checker_;
+
+  // Protects |params_| and |sinks_|.
+  mutable base::Lock lock_;
+
+  // Audio parameters of the audio capture stream.
+  media::AudioParameters audio_parameters_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRtcLocalAudioTrack);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_TRACK_H_