fake_audio_output_stream.h revision 7d4cd473f85ac64c3747c96c277f9e506a0d2246 
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 MEDIA_AUDIO_FAKE_AUDIO_OUTPUT_STREAM_H_
6#define MEDIA_AUDIO_FAKE_AUDIO_OUTPUT_STREAM_H_
7
8#include "base/memory/scoped_ptr.h"
9#include "media/audio/audio_io.h"
10#include "media/audio/audio_parameters.h"
11#include "media/audio/fake_audio_consumer.h"
12
13namespace media {
14
15class AudioManagerBase;
16
17// A fake implementation of AudioOutputStream.  Used for testing and when a real
18// audio output device is unavailable or refusing output (e.g. remote desktop).
19// Callbacks are driven on the AudioManager's message loop.
20class MEDIA_EXPORT FakeAudioOutputStream : public AudioOutputStream {
21 public:
22  static AudioOutputStream* MakeFakeStream(AudioManagerBase* manager,
23                                           const AudioParameters& params);
24
25  // AudioOutputStream implementation.
26  virtual bool Open() OVERRIDE;
27  virtual void Start(AudioSourceCallback* callback) OVERRIDE;
28  virtual void Stop() OVERRIDE;
29  virtual void SetVolume(double volume) OVERRIDE;
30  virtual void GetVolume(double* volume) OVERRIDE;
31  virtual void Close() OVERRIDE;
32
33 private:
34  FakeAudioOutputStream(AudioManagerBase* manager,
35                        const AudioParameters& params);
36  virtual ~FakeAudioOutputStream();
37
38  // Task that periodically calls OnMoreData() to consume audio data.
39  void CallOnMoreData(AudioBus* audio_bus);
40
41  AudioManagerBase* audio_manager_;
42  AudioSourceCallback* callback_;
43  FakeAudioConsumer fake_consumer_;
44
45  DISALLOW_COPY_AND_ASSIGN(FakeAudioOutputStream);
46};
47
48}  // namespace media
49
50#endif  // MEDIA_AUDIO_FAKE_AUDIO_OUTPUT_STREAM_H_
51