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

media/audio/linux/alsa_output.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.
 //
 // THREAD SAFETY
 //
 // The AlsaPcmOutputStream object's internal state is accessed by two threads:
 //
 //   client thread - creates the object and calls the public APIs.
 //   message loop thread - executes all the internal tasks including querying
@@ skipping 332 matching lines @@
         NewRunnableMethod(this, &AlsaPcmOutputStream::StartTask));
   }
 }
 
 void AlsaPcmOutputStream::Stop() {
   DCHECK_EQ(MessageLoop::current(), client_thread_loop_);
 
   shared_data_.TransitionTo(kIsStopped);
 }
 
-void AlsaPcmOutputStream::SetVolume(double left_level, double right_level) {
+void AlsaPcmOutputStream::SetVolume(double volume) {
   DCHECK_EQ(MessageLoop::current(), client_thread_loop_);
 
-  shared_data_.set_volume(static_cast<float>(left_level));
+  shared_data_.set_volume(static_cast<float>(volume));
 }
 
-void AlsaPcmOutputStream::GetVolume(double* left_level, double* right_level) {
+void AlsaPcmOutputStream::GetVolume(double* volume) {
   DCHECK_EQ(MessageLoop::current(), client_thread_loop_);
 
-  *left_level = *right_level = shared_data_.volume();
+  *volume = shared_data_.volume();
 }
 
 void AlsaPcmOutputStream::OpenTask(size_t packet_size) {
   DCHECK_EQ(MessageLoop::current(), message_loop_);
 
   // Initialize the configuration variables.
   frames_per_packet_ = packet_size / bytes_per_frame_;
 
   // Try to open the device.
   micros_per_packet_ =
@@ skipping 566 matching lines @@
 }
 
 // Changes the AudioSourceCallback to proxy calls to.  Pass in NULL to
 // release ownership of the currently registered callback.
 void AlsaPcmOutputStream::SharedData::set_source_callback(
     AudioSourceCallback* callback) {
   DCHECK_EQ(MessageLoop::current(), state_transition_loop_);
   AutoLock l(lock_);
   source_callback_ = callback;
 }