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      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_
     77