SetVolume and GetVolume take one volume instead of separate left and right vo...

media/audio/mac/audio_output_mac.cc

 // Copyright (c) 2009 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.
 
 #include "media/audio/mac/audio_manager_mac.h"
 #include "media/audio/mac/audio_output_mac.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "media/audio/audio_util.h"
@@ skipping 128 matching lines @@
   // queueing data, however at most one callback might still be in flight which
   // could attempt to enqueue right after the next call. Rather that trying to
   // use a lock we rely on the internal Mac queue lock so the enqueue might
   // succeed or might fail but it won't crash or leave the queue itself in an
   // inconsistent state.
   OSStatus err = AudioQueueStop(audio_queue_, true);
   if (err != noErr)
     HandleError(err);
 }
 
-void PCMQueueOutAudioOutputStream::SetVolume(double left_level,
-                                             double ) {
+void PCMQueueOutAudioOutputStream::SetVolume(double volume) {
   if (!audio_queue_)
     return;
-  volume_ = static_cast<float>(left_level);
+  volume_ = static_cast<float>(volume);
   OSStatus err = AudioQueueSetParameter(audio_queue_,
                                         kAudioQueueParam_Volume,
-                                        left_level);
+                                        volume);
   if (err != noErr) {
     HandleError(err);
   }
 }
 
-void PCMQueueOutAudioOutputStream::GetVolume(double* left_level,
-                                             double* right_level) {
+void PCMQueueOutAudioOutputStream::GetVolume(double* volume) {
   if (!audio_queue_)
     return;
-  *left_level = volume_;
-  *right_level = volume_;
+  *volume = volume_;
 }
 
 // Reorder PCM from AAC layout to Core Audio layout.
 // TODO(fbarchard): Switch layout when ffmpeg is updated.
 namespace {
 template<class Format>
 static void SwizzleLayout(Format* b, size_t filled) {
   static const int kNumSurroundChannels = 6;
   Format aac[kNumSurroundChannels];
   for (size_t i = 0; i < filled; i += sizeof(aac), b += kNumSurroundChannels) {
@@ skipping 89 matching lines @@
       HandleError(err);
       return;
     }
   }
   err  = AudioQueueStart(audio_queue_, NULL);
   if (err != noErr) {
     HandleError(err);
     return;
   }
 }