Pass more detailed audio hardware configuration information to the renderer

media/audio/audio_util.cc

Index: media/audio/audio_util.cc
===================================================================
--- media/audio/audio_util.cc	(revision 185058)
+++ media/audio/audio_util.cc	(working copy)
@@ -29,6 +29,7 @@
 #if defined(OS_MACOSX)
 #include "media/audio/mac/audio_low_latency_input_mac.h"
 #include "media/audio/mac/audio_low_latency_output_mac.h"
+#include "media/audio/mac/audio_unified_mac.h"
 #elif defined(OS_WIN)
 #include "base/win/windows_version.h"
 #include "media/audio/audio_manager_base.h"
@@ -284,4 +285,18 @@
 
 #endif
 
+int GetAudioHardwareOutputChannels() {
+#if defined(OS_MACOSX)
+  int channels, channels_per_frame;
+  if (AudioHardwareUnifiedStream::GetDefaultOutputChannels(
+      &channels, &channels_per_frame))
+    return channels;
+  else
+    return 2;
+#else
+  // !!!!
+  return 2;
+#endif
+}
+
 }  // namespace media