Browser-wide audio mirroring for TabCapture API

media/audio/virtual_audio_input_stream.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A fake implementation of AudioInputStream, useful for testing purpose.
 
-#ifndef MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_
-#define MEDIA_AUDIO_FAKE_AUDIO_INOUT_STREAM_H_
+#ifndef MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_
+#define MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_
 
 #include <vector>
+#include <set>
 
+#include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread.h"
 #include "base/time.h"
 #include "media/audio/audio_io.h"
+#include "base/synchronization/lock.h"
 #include "media/audio/audio_parameters.h"
+#include "media/audio/audio_output_resampler.h"
 
 namespace media {
 
 class AudioManagerBase;
 
-class MEDIA_EXPORT FakeAudioInputStream
+class MEDIA_EXPORT VirtualAudioInputStream
     : public AudioInputStream {
  public:
-  static AudioInputStream* MakeFakeStream(AudioManagerBase* manager,
-                                          const AudioParameters& params);
+  static AudioInputStream* MakeStream(AudioManagerBase* manager,
+                                      const AudioParameters& params);
 
   virtual bool Open() OVERRIDE;
   virtual void Start(AudioInputCallback* callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual double GetMaxVolume() OVERRIDE;
   virtual void SetVolume(double volume) OVERRIDE;
   virtual double GetVolume() OVERRIDE;
   virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
   virtual bool GetAutomaticGainControl() OVERRIDE;
 
-  // Generate one beep sound. This method is called by
-  // FakeVideoCaptureDevice to test audio/video synchronization.
-  // This is a static method because FakeVideoCaptureDevice is
-  // disconnected from an audio device. This means only one instance of
-  // this class gets to respond, which is okay because we assume there's
-  // only one stream for this testing purpose.
-  // TODO(hclam): Make this non-static. To do this we'll need to fix
-  // crbug.com/159053 such that video capture device is aware of audio
-  // input stream.
-  static void BeepOnce();
+ private:
+  void DoCallback();
 
- private:
-  FakeAudioInputStream(AudioManagerBase* manager,
+  VirtualAudioInputStream(AudioManagerBase* manager,
                        const AudioParameters& params);
 
-  virtual ~FakeAudioInputStream();
-
-  void DoCallback();
+  virtual ~VirtualAudioInputStream();
 
   AudioManagerBase* audio_manager_;
   AudioInputCallback* callback_;
   scoped_array<uint8> buffer_;
   int buffer_size_;
   AudioParameters params_;
-  base::Thread thread_;
-  base::Time last_callback_time_;
-  base::TimeDelta callback_interval_;
-  int beep_duration_in_buffers_;
-  int beep_generated_in_buffers_;
-  int beep_period_in_frames_;
-  int frames_elapsed_;
+  scoped_ptr<AudioBus> audio_bus_;
+  scoped_ptr<OnMoreDataResampler> resampler_;
+  base::CancelableClosure on_more_data_cb_;
 
-  DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
+  DISALLOW_COPY_AND_ASSIGN(VirtualAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_FAKE_AUDIO_INPUT_STREAM_H_