Add support for the audio-output-device switching IPC mechanism to the renderer lower layers (media…

media/blink/webaudiosourceprovider_impl.cc

 // Copyright 2013 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/blink/webaudiosourceprovider_impl.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 145 matching lines @@
 }
 
 bool WebAudioSourceProviderImpl::SetVolume(double volume) {
   base::AutoLock auto_lock(sink_lock_);
   volume_ = volume;
   if (!client_)
     sink_->SetVolume(volume);
   return true;
 }
 
+void WebAudioSourceProviderImpl::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const SwitchOutputDeviceCB& callback) {
+  base::AutoLock auto_lock(sink_lock_);
+  if (!client_) {
+    sink_->SwitchOutputDevice(device_id, security_origin, callback);
+  } else {
+    callback.Run(SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED);
+  }
+}
+
 void WebAudioSourceProviderImpl::Initialize(
     const AudioParameters& params,
     RenderCallback* renderer) {
   base::AutoLock auto_lock(sink_lock_);
   CHECK(!renderer_);
   renderer_ = renderer;
 
   DCHECK_EQ(state_, kStopped);
   sink_->Initialize(params, renderer);
 
   // Keep track of the format in case the client hasn't yet been set.
   channels_ = params.channels();
   sample_rate_ = params.sample_rate();
 
   if (!set_format_cb_.is_null())
     base::ResetAndReturn(&set_format_cb_).Run();
 }
 
 void WebAudioSourceProviderImpl::OnSetFormat() {
   base::AutoLock auto_lock(sink_lock_);
   if (!client_)
     return;
 
   // Inform Blink about the audio stream format.
   client_->setFormat(channels_, sample_rate_);
 }
 
 }  // namespace media