Pass more detailed audio hardware configuration information to the renderer

media/base/channel_mixer.h

Index: media/base/channel_mixer.h
===================================================================
--- media/base/channel_mixer.h	(revision 187648)
+++ media/base/channel_mixer.h	(working copy)
@@ -14,6 +14,7 @@
 namespace media {
 
 class AudioBus;
+class AudioParameters;
 
 // ChannelMixer is for converting audio between channel layouts.  The conversion
 // matrix is built upon construction and used during each Transform() call.  The
@@ -23,9 +24,13 @@
 // input channels as defined in the matrix.
 class MEDIA_EXPORT ChannelMixer {
  public:
-  ChannelMixer(ChannelLayout input, ChannelLayout output);
+  ChannelMixer(ChannelLayout input_layout, ChannelLayout output_layout);
+  ChannelMixer(const AudioParameters& input, const AudioParameters& output);
   ~ChannelMixer();
 
+  void Initialize(ChannelLayout input_layout, int input_channels,
+                  ChannelLayout output_layout, int output_channels);
+
   // Transforms all channels from |input| into |output| channels.
   void Transform(const AudioBus* input, AudioBus* output);