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/memory/scoped_ptr.h"
  13 #include "base/synchronization/lock.h"
  14 #include "base/threading/thread.h"
  15 #include "base/time/time.h"
  16 #include "media/audio/audio_io.h"
  17 #include "media/audio/audio_parameters.h"
  18
  19 namespace media {
  20
  21 class AudioManagerBase;
  22
  23 class MEDIA_EXPORT FakeAudioInputStream
  24     : public AudioInputStream {
  25  public:
  26   static AudioInputStream* MakeFakeStream(AudioManagerBase* manager,
  27                                           const AudioParameters& params);
  28
  29   virtual bool Open() OVERRIDE;
  30   virtual void Start(AudioInputCallback* callback) OVERRIDE;
  31   virtual void Stop() OVERRIDE;
  32   virtual void Close() OVERRIDE;
  33   virtual double GetMaxVolume() OVERRIDE;
  34   virtual void SetVolume(double volume) OVERRIDE;
  35   virtual double GetVolume() OVERRIDE;
  36   virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
  37   virtual bool GetAutomaticGainControl() OVERRIDE;
  38
  39   // Generate one beep sound. This method is called by
  40   // FakeVideoCaptureDevice to test audio/video synchronization.
  41   // This is a static method because FakeVideoCaptureDevice is
  42   // disconnected from an audio device. This means only one instance of
  43   // this class gets to respond, which is okay because we assume there's
  44   // only one stream for this testing purpose.
  45   // TODO(hclam): Make this non-static. To do this we'll need to fix
  46   // crbug.com/159053 such that video capture device is aware of audio
  47   // input stream.
  48   static void BeepOnce();
  49
  50  private:
  51   FakeAudioInputStream(AudioManagerBase* manager,
  52                        const AudioParameters& params);
  53
  54   virtual ~FakeAudioInputStream();
  55
  56   void DoCallback();
  57
  58   AudioManagerBase* audio_manager_;
  59   AudioInputCallback* callback_;
  60   scoped_ptr<uint8[]> buffer_;
  61   int buffer_size_;
  62   AudioParameters params_;
  63   base::Thread thread_;
  64   base::TimeTicks last_callback_time_;
  65   base::TimeDelta callback_interval_;
  66   int beep_duration_in_buffers_;
  67   int beep_generated_in_buffers_;
  68   int beep_period_in_frames_;
  69   int frames_elapsed_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
  72 };
  73
  74 }  // namespace media
  75
  76 #endif  // MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_