Pass more detailed audio hardware configuration information to the renderer

media/audio/mac/audio_unified_mac.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_MAC_AUDIO_UNIFIED_MAC_H_
 #define MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_
 
 #include <CoreAudio/CoreAudio.h>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 26 matching lines @@
   virtual bool Open() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void Start(AudioSourceCallback* callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void SetVolume(double volume) OVERRIDE;
   virtual void GetVolume(double* volume) OVERRIDE;
 
   int input_channels() const { return input_channels_; }
   int output_channels() const { return output_channels_; }
 
+  static bool GetDefaultOutputDevice(AudioDeviceID* device);
+
+  static bool GetDefaultOutputChannels(int* channels,
+                                       int* channels_per_frame);
+
+  static bool GetDeviceChannels(AudioDeviceID device,
+                                AudioObjectPropertyScope scope,
+                                int* channels,
+                                int* channels_per_frame);
+
+
  private:
   OSStatus Render(AudioDeviceID device,
                   const AudioTimeStamp* now,
                   const AudioBufferList* input_data,
                   const AudioTimeStamp* input_time,
                   AudioBufferList* output_data,
                   const AudioTimeStamp* output_time);
 
   static OSStatus RenderProc(AudioDeviceID device,
                              const AudioTimeStamp* now,
@@ skipping 34 matching lines @@
   // Intermediate buffers used with call to OnMoreIOData().
   scoped_ptr<AudioBus> input_bus_;
   scoped_ptr<AudioBus> output_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioHardwareUnifiedStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_