Add Mac OS X synchronized audio I/O back-end

media/audio/audio_output_resampler.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_AUDIO_OUTPUT_RESAMPLER_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
@@ skipping 64 matching lines @@
   virtual ~AudioOutputResampler();
 
   // Used to initialize the FIFO and resamplers.
   void Initialize();
 
   // Called by MultiChannelResampler when more data is necessary.
   void ProvideInput(AudioBus* audio_bus);
 
   // Called by AudioPullFifo when more data is necessary.  Requires
   // |source_lock_| to have been acquired.
-  void SourceCallback_Locked(AudioBus* audio_bus);
+  void SourceCallback_Locked(AudioBus* dest);
+
+  // Passes through |source| to the |source_callback_| OnMoreIOData() call.
+  void SourceIOCallback_Locked(AudioBus* source, AudioBus* dest);
 
   // Used by StopStream()/CloseStream()/Shutdown() to clear internal state.
   // TODO(dalecurtis): Probably only one of these methods needs to call this,
   // the rest should DCHECK()/CHECK() that the values were reset.
   void Reset();
 
   // Handles resampling.
   scoped_ptr<MultiChannelResampler> resampler_;
 
   // Dispatcher to proxy all AudioOutputDispatcher calls too.
@@ skipping 26 matching lines @@
 
   // AudioParameters used to setup the output stream.
   AudioParameters output_params_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputResampler);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_RESAMPLER_H_