Add generic interfaces for the sinks of the media stream audio track

content/renderer/media/webrtc_audio_capturer_sink_owner.h

-// 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_AUDIO_CAPTURER_SINK_OWNER_H_
-#define CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_CAPTURER_SINK_OWNER_H_
-
-#include <vector>
-
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/lock.h"
-#include "content/renderer/media/webrtc_audio_device_impl.h"
-#include "media/audio/audio_parameters.h"
-
-namespace content {
-
-class WebRtcAudioCapturerSink;
-
-// Reference counted container of WebRtcAudioCapturerSink delegates.
-class WebRtcAudioCapturerSinkOwner
-    : public base::RefCountedThreadSafe<WebRtcAudioCapturerSinkOwner>,
-      public WebRtcAudioCapturerSink {
- public:
-  explicit WebRtcAudioCapturerSinkOwner(WebRtcAudioCapturerSink* sink);
-
-  // WebRtcAudioCapturerSink implementation.
-  virtual int CaptureData(const std::vector<int>& channels,
-                          const int16* audio_data,
-                          int sample_rate,
-                          int number_of_channels,
-                          int number_of_frames,
-                          int audio_delay_milliseconds,
-                          int current_volume,
-                          bool need_audio_processing,
-                          bool key_pressed) OVERRIDE;
-
-  virtual void SetCaptureFormat(const media::AudioParameters& params) OVERRIDE;
-
-  bool IsEqual(const WebRtcAudioCapturerSink* other) const;
-  void Reset();
-
-  // Wrapper which allows to use std::find_if() when adding and removing
-  // sinks to/from the list.
-  struct WrapsSink {
-    WrapsSink(WebRtcAudioCapturerSink* sink) : sink_(sink) {}
-    bool operator()(
-        const scoped_refptr<WebRtcAudioCapturerSinkOwner>& owner) {
-      return owner->IsEqual(sink_);
-    }
-    WebRtcAudioCapturerSink* sink_;
-  };
-
- protected:
-  virtual ~WebRtcAudioCapturerSinkOwner() {}
-
- private:
-  friend class base::RefCountedThreadSafe<WebRtcAudioCapturerSinkOwner>;
-  WebRtcAudioCapturerSink* delegate_;
-  mutable base::Lock lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebRtcAudioCapturerSinkOwner);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_CAPTURER_SINK_OWNER_H_