Switch OnMoreData() to use AudioBus.

media/audio/simple_sources.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.
 
 #ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_
 #define MEDIA_AUDIO_SIMPLE_SOURCES_H_
 
-#include <list>
-
+#include "base/synchronization/lock.h"
 #include "media/audio/audio_io.h"
 #include "media/base/seekable_buffer.h"
 
 namespace media {
 
 // An audio source that produces a pure sinusoidal tone.
 class MEDIA_EXPORT SineWaveAudioSource
     : public AudioOutputStream::AudioSourceCallback {
  public:
-  enum Format {
-    FORMAT_8BIT_LINEAR_PCM,
-    FORMAT_16BIT_LINEAR_PCM,
-  };
   // |channels| is the number of audio channels, |freq| is the frequency in
   // hertz and it has to be less than half of the sampling frequency
   // |sample_freq| or else you will get aliasing.
-  SineWaveAudioSource(Format format, int channels,
-                      double freq, double sample_freq);
+  SineWaveAudioSource(int channels, double freq, double sample_freq);
   virtual ~SineWaveAudioSource() {}
 
+  // Return up to |cap| samples of data via OnMoreData().  Use Reset() to
+  // allow more data to be served.
+  void CapSamples(int cap);
+  void Reset();
+
   // Implementation of AudioSourceCallback.
-  virtual uint32 OnMoreData(
-      uint8* dest, uint32 max_size, AudioBuffersState audio_buffers) OVERRIDE;
+  virtual int OnMoreData(AudioBus* audio_bus,
+                         AudioBuffersState audio_buffers) OVERRIDE;
   virtual void OnError(AudioOutputStream* stream, int code) OVERRIDE;
 
  protected:
-  Format format_;
   int channels_;
-  double freq_;
-  double sample_freq_;
+  double f_;
   int time_state_;
-};
-
-// Defines an interface for pushing audio output. In contrast, the interfaces
-// defined by AudioSourceCallback are pull model only.
-class MEDIA_EXPORT PushAudioOutput {
- public:
-  virtual ~PushAudioOutput() {}
-
-  // Write audio data to the audio device. It will be played eventually.
-  // Returns false on failure.
-  virtual bool Write(const void* data, uint32 len) = 0;
-
-  // Returns the number of bytes that have been buffered but not yet given
-  // to the audio device.
-  virtual uint32 UnProcessedBytes() = 0;
-};
-
-// A fairly basic class to connect a push model provider PushAudioOutput to
-// a pull model provider AudioSourceCallback. Fundamentally it manages a series
-// of audio buffers and is unaware of the actual audio format.
-// Note that the PushSource is not thread safe and user need to provide locking.
-class MEDIA_EXPORT PushSource
-    : public AudioOutputStream::AudioSourceCallback,
-      public PushAudioOutput {
- public:
-  PushSource();
-  virtual ~PushSource();
-
-  // Write one buffer.
-  virtual bool Write(const void* data, uint32 len) OVERRIDE;
-
-  // Return the total number of bytes not given to the audio device yet.
-  virtual uint32 UnProcessedBytes() OVERRIDE;
-
-  // Implementation of AudioSourceCallback.
-  virtual uint32 OnMoreData(uint8* dest,
-                            uint32 max_size,
-                            AudioBuffersState buffers_state) OVERRIDE;
-  virtual void OnError(AudioOutputStream* stream, int code) OVERRIDE;
-
- private:
-  // Free acquired resources.
-  void CleanUp();
-
-  media::SeekableBuffer buffer_;
+  int cap_;
+  base::Lock time_lock_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_SIMPLE_SOURCES_H_