content/public/renderer/media_stream_audio_sink.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_AUDIO_SINK_H_
   6 #define CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_AUDIO_SINK_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11 #include "content/common/content_export.h"
  12 #include "content/public/renderer/media_stream_sink.h"
  13
  14 namespace blink {
  15 class WebMediaStreamTrack;
  16 }
  17
  18 namespace media {
  19 class AudioParameters;
  20 }
  21
  22 namespace content {
  23
  24 class CONTENT_EXPORT MediaStreamAudioSink : public MediaStreamSink {
  25  public:
  26   // Adds a MediaStreamAudioSink to the audio track to receive audio data from
  27   // the track.
  28   // Called on the main render thread.
  29   static void AddToAudioTrack(MediaStreamAudioSink* sink,
  30                               const blink::WebMediaStreamTrack& track);
  31
  32   // Removes a MediaStreamAudioSink from the audio track to stop receiving
  33   // audio data from the track.
  34   // Called on the main render thread.
  35   static void RemoveFromAudioTrack(MediaStreamAudioSink* sink,
  36                                    const blink::WebMediaStreamTrack& track);
  37
  38   // Callback on delivering the interleaved audio data.
  39   // |audio_data| is the pointer to the audio data.
  40   // |sample_rate| is the sample frequency of |audio_data|.
  41   // |number_of_channels| is the number of audio channels of |audio_data|.
  42   // |number_of_frames| is the number of audio frames in the |audio_data|.
  43   // Called on real-time audio thread.
  44   virtual void OnData(const int16* audio_data,
  45                       int sample_rate,
  46                       int number_of_channels,
  47                       int number_of_frames) = 0;
  48
  49   // Callback called when the format of the audio stream has changed.
  50   // This is called on the same thread as OnData().
  51   virtual void OnSetFormat(const media::AudioParameters& params) = 0;
  52
  53  protected:
  54   virtual ~MediaStreamAudioSink() {}
  55 };
  56
  57 }  // namespace content
  58
  59 #endif  // CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_AUDIO_SINK_H_