Implement hook to change audio output device for PulseAudio.

media/audio/pulse/pulse_output.cc

 // Copyright (c) 2012 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/pulse/pulse_output.h"
 
 #include <pulse/pulseaudio.h>
 
 #include "base/single_thread_task_runner.h"
 #include "media/audio/audio_manager_base.h"
@@ skipping 21 matching lines @@
 }
 
 // static, pa_stream_request_cb_t
 void PulseAudioOutputStream::StreamRequestCallback(pa_stream* s, size_t len,
                                                    void* p_this) {
   // Fulfill write request; must always result in a pa_stream_write() call.
   static_cast<PulseAudioOutputStream*>(p_this)->FulfillWriteRequest(len);
 }
 
 PulseAudioOutputStream::PulseAudioOutputStream(const AudioParameters& params,
+                                               const std::string& device_id,
                                                AudioManagerBase* manager)
     : params_(params),
+      device_id_(device_id),
       manager_(manager),
       pa_context_(NULL),
       pa_mainloop_(NULL),
       pa_stream_(NULL),
       volume_(1.0f),
       source_callback_(NULL) {
   DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
 
   CHECK(params_.IsValid());
   audio_bus_ = AudioBus::Create(params_);
 }
 
 PulseAudioOutputStream::~PulseAudioOutputStream() {
   // All internal structures should already have been freed in Close(), which
   // calls AudioManagerBase::ReleaseOutputStream() which deletes this object.
   DCHECK(!pa_stream_);
   DCHECK(!pa_context_);
   DCHECK(!pa_mainloop_);
 }
 
 bool PulseAudioOutputStream::Open() {
   DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
   return pulse::CreateOutputStream(&pa_mainloop_, &pa_context_, &pa_stream_,
-                                   params_, &StreamNotifyCallback,
+                                   params_, device_id_, &StreamNotifyCallback,
                                    &StreamRequestCallback, this);
 }
 
 void PulseAudioOutputStream::Reset() {
   if (!pa_mainloop_) {
     DCHECK(!pa_stream_);
     DCHECK(!pa_context_);
     return;
   }
 
@@ skipping 129 matching lines @@
   volume_ = static_cast<float>(volume);
 }
 
 void PulseAudioOutputStream::GetVolume(double* volume) {
   DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
 
   *volume = volume_;
 }
 
 }  // namespace media