Make AudioParameters a class instead of a struct

media/audio/audio_util.cc

Index: media/audio/audio_util.cc
diff --git a/media/audio/audio_util.cc b/media/audio/audio_util.cc
index b387ce71ed8175a402d5e4f7251bdc1d8df55882..554567e0bdec7e46d8cfb17669c1a997d7813cc3 100644
--- a/media/audio/audio_util.cc
+++ b/media/audio/audio_util.cc
@@ -309,21 +309,21 @@ size_t GetAudioHardwareBufferSize() {
 #endif
 }
 
-uint32 GetAudioInputHardwareChannelCount(const std::string& device_id) {
+ChannelLayout GetAudioInputHardwareChannelLayout(const std::string& device_id) {
   // TODO(henrika): add support for device selection on all platforms.
   // Only exists on Windows today.
-  enum channel_layout { MONO = 1, STEREO = 2 };
 #if defined(OS_MACOSX)
-  return MONO;
+  return CHANNEL_LAYOUT_MONO;
 #elif defined(OS_WIN)
   if (!IsWASAPISupported()) {
     // Fall back to Windows Wave implementation on Windows XP or lower and
     // use stereo by default.
-    return STEREO;
+    return CHANNEL_LAYOUT_STEREO;
   }
-  return WASAPIAudioInputStream::HardwareChannelCount(device_id);
+  return WASAPIAudioInputStream::HardwareChannelCount(device_id) == 1 ?
+      CHANNEL_LAYOUT_MONO : CHANNEL_LAYOUT_STEREO;
 #else
-  return STEREO;
+  return CHANNEL_LAYOUT_STEREO;
 #endif
 }