clockless_audio_sink.h revision 3551c9c881056c480085172ff9840cab31610854 
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 MEDIA_AUDIO_CLOCKLESS_AUDIO_SINK_H_
6#define MEDIA_AUDIO_CLOCKLESS_AUDIO_SINK_H_
7
8#include "base/memory/scoped_ptr.h"
9#include "base/time/time.h"
10#include "media/base/audio_renderer_sink.h"
11
12namespace base {
13class MessageLoopProxy;
14}
15
16namespace media {
17class AudioBus;
18class ClocklessAudioSinkThread;
19
20// Implementation of an AudioRendererSink that consumes the audio as fast as
21// possible. This class does not support multiple Play()/Pause() events.
22class MEDIA_EXPORT ClocklessAudioSink
23    : NON_EXPORTED_BASE(public AudioRendererSink) {
24 public:
25  ClocklessAudioSink();
26
27  // AudioRendererSink implementation.
28  virtual void Initialize(const AudioParameters& params,
29                          RenderCallback* callback) OVERRIDE;
30  virtual void Start() OVERRIDE;
31  virtual void Stop() OVERRIDE;
32  virtual void Pause() OVERRIDE;
33  virtual void Play() OVERRIDE;
34  virtual bool SetVolume(double volume) OVERRIDE;
35
36  // Returns the time taken to consume all the audio.
37  base::TimeDelta render_time() { return playback_time_; }
38
39 protected:
40  virtual ~ClocklessAudioSink();
41
42 private:
43  scoped_ptr<ClocklessAudioSinkThread> thread_;
44  bool initialized_;
45  bool playing_;
46
47  // Time taken in last set of Render() calls.
48  base::TimeDelta playback_time_;
49
50  DISALLOW_COPY_AND_ASSIGN(ClocklessAudioSink);
51};
52
53}  // namespace media
54
55#endif  // MEDIA_AUDIO_CLOCKLESS_AUDIO_SINK_H_
56