Moved the fake input stream's processing onto the audio worker thread.

media/audio/fake_audio_input_stream.h

Index: media/audio/fake_audio_input_stream.h
diff --git a/media/audio/fake_audio_input_stream.h b/media/audio/fake_audio_input_stream.h
index fafcca330dd809f5efe73effaab9ba4bfc9a949c..8691faf5d4ebe4106d0e60f571a255d71dc7d116 100644
--- a/media/audio/fake_audio_input_stream.h
+++ b/media/audio/fake_audio_input_stream.h
@@ -9,6 +9,7 @@
 
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
@@ -16,17 +17,20 @@
 #include "base/time/time.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
+#include "media/audio/fake_audio_provider.h"
 #include "media/audio/sounds/wav_audio_handler.h"
-#include "media/base/audio_converter.h"
 
 namespace media {
 
 class AudioBus;
 class AudioManagerBase;
 
-// This class can either generate a beep sound or play audio from a file.
+// This class acts as a fake audio input stream. The default is to generate a
+// beeping sound unless --use-file-for-fake-audio-capture=<file> is specified,
+// in which case the indicated .wav file will be read and played into the
+// stream.
 class MEDIA_EXPORT FakeAudioInputStream
-    : public AudioInputStream, AudioConverter::InputCallback {
+    : public AudioInputStream {
  public:
   static AudioInputStream* MakeFakeStream(
       AudioManagerBase* manager, const AudioParameters& params);
@@ -47,7 +51,9 @@ class MEDIA_EXPORT FakeAudioInputStream
   // 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.
+  // only one stream for this testing purpose. Furthermore this method will do
+  // nothing if --use-file-for-fake-audio-capture is specified since the input
+  // stream will be playing from a file instead of beeping.
   // 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.
@@ -58,42 +64,11 @@ class MEDIA_EXPORT FakeAudioInputStream
                        const AudioParameters& params);
   ~FakeAudioInputStream() override;
 
-  void DoCallback();
-
-  // Opens this stream reading from a |wav_filename| rather than beeping.
-  void OpenInFileMode(const base::FilePath& wav_filename);
-
-  // Returns true if the device is playing from a file; false if we're beeping.
-  bool PlayingFromFile();
-
-  void PlayFile();
-  void PlayBeep();
+  void OnMoreInputData(AudioBus* audio_bus, int buffer_size);
 
   AudioManagerBase* audio_manager_;
   AudioInputCallback* callback_;
-  scoped_ptr<uint8[]> buffer_;
-  int buffer_size_;
-  AudioParameters params_;
-  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  base::TimeTicks last_callback_time_;
-  base::TimeDelta callback_interval_;
-  base::TimeDelta interval_from_last_beep_;
-  int beep_duration_in_buffers_;
-  int beep_generated_in_buffers_;
-  int beep_period_in_frames_;
-  scoped_ptr<media::AudioBus> audio_bus_;
-  scoped_ptr<uint8[]> wav_file_data_;
-  scoped_ptr<media::WavAudioHandler> wav_audio_handler_;
-  scoped_ptr<media::AudioConverter> file_audio_converter_;
-  int wav_file_read_pos_;
-
-  // Allows us to run tasks on the FakeAudioInputStream instance which are
-  // bound by its lifetime.
-  base::WeakPtrFactory<FakeAudioInputStream> weak_factory_;
-
-  // If running in file mode, this provides audio data from wav_audio_handler_.
-  double ProvideInput(AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override;
+  FakeAudioProvider fake_audio_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputStream);
 };