media/audio/fake_audio_input_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 // A fake implementation of AudioInputStream, useful for testing purpose.
   6
   7 #ifndef MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
   8 #define MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
   9
  10 #include <vector>
  11
  12 #include "base/callback_forward.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "media/audio/audio_io.h"
  15 #include "media/audio/audio_parameters.h"
  16 #include "media/audio/fake_audio_worker.h"
  17
  18
  19 namespace media {
  20
  21 class AudioBus;
  22 class AudioManagerBase;
  23 class SimpleSource;
  24
  25 // This class acts as a fake audio input stream. The default is to generate a
  26 // beeping sound unless --use-file-for-fake-audio-capture=<file> is specified,
  27 // in which case the indicated .wav file will be read and played into the
  28 // stream.
  29 class MEDIA_EXPORT FakeAudioInputStream
  30     : public AudioInputStream {
  31  public:
  32   static AudioInputStream* MakeFakeStream(
  33       AudioManagerBase* manager, const AudioParameters& params);
  34
  35   bool Open() override;
  36   void Start(AudioInputCallback* callback) override;
  37   void Stop() override;
  38   void Close() override;
  39   double GetMaxVolume() override;
  40   void SetVolume(double volume) override;
  41   double GetVolume() override;
  42   bool IsMuted() override;
  43   bool SetAutomaticGainControl(bool enabled) override;
  44   bool GetAutomaticGainControl() override;
  45
  46   // Generate one beep sound. This method is called by FakeVideoCaptureDevice to
  47   // test audio/video synchronization. This is a static method because
  48   // FakeVideoCaptureDevice is disconnected from an audio device. This means
  49   // only one instance of this class gets to respond, which is okay because we
  50   // assume there's only one stream for this testing purpose. Furthermore this
  51   // method will do nothing if --use-file-for-fake-audio-capture is specified
  52   // since the input stream will be playing from a file instead of beeping.
  53   // TODO(hclam): Make this non-static. To do this we'll need to fix
  54   // crbug.com/159053 such that video capture device is aware of audio
  55   // input stream.
  56   static void BeepOnce();
  57
  58  private:
  59   FakeAudioInputStream(AudioManagerBase* manager,
  60                        const AudioParameters& params);
  61   ~FakeAudioInputStream() override;
  62
  63   scoped_ptr<AudioOutputStream::AudioSourceCallback> ChooseSource();
  64   void ReadAudioFromSource();
  65
  66   AudioManagerBase* audio_manager_;
  67   AudioInputCallback* callback_;
  68   FakeAudioWorker fake_audio_worker_;
  69   AudioParameters params_;
  70
  71   scoped_ptr<AudioOutputStream::AudioSourceCallback> audio_source_;
  72   scoped_ptr<media::AudioBus> audio_bus_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
  75 };
  76
  77 }  // namespace media
  78
  79 #endif  // MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_