media/audio/fake_audio_output_stream.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 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
  13 namespace media {
  14
  15 class 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.
  20 class 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_