webkit/media/media_stream_audio_renderer.h

   1 // Copyright (c) 2012 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 WEBKIT_MEDIA_MEDIA_STREAM_AUDIO_RENDERER_H_
   6 #define WEBKIT_MEDIA_MEDIA_STREAM_AUDIO_RENDERER_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/time.h"
  10
  11 namespace webkit_media {
  12
  13 class MediaStreamAudioRenderer
  14     : public base::RefCountedThreadSafe<MediaStreamAudioRenderer> {
  15  public:
  16   // Starts rendering audio.
  17   virtual void Start() = 0;
  18
  19   // Stops rendering audio.
  20   virtual void Stop() = 0;
  21
  22   // Resumes rendering audio after being paused.
  23   virtual void Play() = 0;
  24
  25   // Temporarily suspends rendering audio. The audio stream might still be
  26   // active but new audio data is not provided to the consumer.
  27   virtual void Pause() = 0;
  28
  29   // Sets the output volume.
  30   virtual void SetVolume(float volume) = 0;
  31
  32   // Time stamp that reflects the current render time. Should not be updated
  33   // when paused.
  34   virtual base::TimeDelta GetCurrentRenderTime() const = 0;
  35
  36   // Returns true if the implementation is a local renderer and false
  37   // otherwise.
  38   virtual bool IsLocalRenderer() const = 0;
  39
  40  protected:
  41   friend class base::RefCountedThreadSafe<MediaStreamAudioRenderer>;
  42
  43   MediaStreamAudioRenderer();
  44   virtual ~MediaStreamAudioRenderer();
  45
  46  private:
  47   DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioRenderer);
  48 };
  49
  50 }  // namespace webkit_media
  51
  52 #endif  // WEBKIT_MEDIA_MEDIA_STREAM_AUDIO_RENDERER_H_