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/files/file_path.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/synchronization/lock.h"
  15 #include "base/threading/thread.h"
  16 #include "base/time/time.h"
  17 #include "media/audio/audio_io.h"
  18 #include "media/audio/audio_parameters.h"
  19 #include "media/audio/sounds/wav_audio_handler.h"
  20 #include "media/base/audio_converter.h"
  21
  22 namespace media {
  23
  24 class AudioBus;
  25 class AudioManagerBase;
  26
  27 // This class can either generate a beep sound or play audio from a file.
  28 class MEDIA_EXPORT FakeAudioInputStream
  29     : public AudioInputStream, AudioConverter::InputCallback {
  30  public:
  31   static AudioInputStream* MakeFakeStream(
  32       AudioManagerBase* manager, const AudioParameters& params);
  33
  34   bool Open() override;
  35   void Start(AudioInputCallback* callback) override;
  36   void Stop() override;
  37   void Close() override;
  38   double GetMaxVolume() override;
  39   void SetVolume(double volume) override;
  40   double GetVolume() override;
  41   bool IsMuted() override;
  42   bool SetAutomaticGainControl(bool enabled) override;
  43   bool GetAutomaticGainControl() override;
  44
  45   // Generate one beep sound. This method is called by
  46   // FakeVideoCaptureDevice to test audio/video synchronization.
  47   // This is a static method because FakeVideoCaptureDevice is
  48   // disconnected from an audio device. This means only one instance of
  49   // this class gets to respond, which is okay because we assume there's
  50   // only one stream for this testing purpose.
  51   // TODO(hclam): Make this non-static. To do this we'll need to fix
  52   // crbug.com/159053 such that video capture device is aware of audio
  53   // input stream.
  54   static void BeepOnce();
  55
  56  private:
  57   FakeAudioInputStream(AudioManagerBase* manager,
  58                        const AudioParameters& params);
  59   ~FakeAudioInputStream() override;
  60
  61   void DoCallback();
  62
  63   // Opens this stream reading from a |wav_filename| rather than beeping.
  64   void OpenInFileMode(const base::FilePath& wav_filename);
  65
  66   // Returns true if the device is playing from a file; false if we're beeping.
  67   bool PlayingFromFile();
  68
  69   void PlayFile();
  70   void PlayBeep();
  71
  72   AudioManagerBase* audio_manager_;
  73   AudioInputCallback* callback_;
  74   scoped_ptr<uint8[]> buffer_;
  75   int buffer_size_;
  76   AudioParameters params_;
  77   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  78   base::TimeTicks last_callback_time_;
  79   base::TimeDelta callback_interval_;
  80   base::TimeDelta interval_from_last_beep_;
  81   int beep_duration_in_buffers_;
  82   int beep_generated_in_buffers_;
  83   int beep_period_in_frames_;
  84   scoped_ptr<media::AudioBus> audio_bus_;
  85   scoped_ptr<uint8[]> wav_file_data_;
  86   scoped_ptr<media::WavAudioHandler> wav_audio_handler_;
  87   scoped_ptr<media::AudioConverter> file_audio_converter_;
  88   int wav_file_read_pos_;
  89
  90   // Allows us to run tasks on the FakeAudioInputStream instance which are
  91   // bound by its lifetime.
  92   base::WeakPtrFactory<FakeAudioInputStream> weak_factory_;
  93
  94   // If running in file mode, this provides audio data from wav_audio_handler_.
  95   double ProvideInput(AudioBus* audio_bus,
  96                       base::TimeDelta buffer_delay) override;
  97
  98   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
  99 };
 100
 101 }  // namespace media
 102
 103 #endif  // MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_