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

media/base/audio_renderer_mixer_input.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/base/audio_renderer_mixer_input.h"
 
 #include "base/bind.h"
+#include "base/location.h"
 #include "base/logging.h"
 #include "media/base/audio_renderer_mixer.h"
 
 namespace media {
 
 AudioRendererMixerInput::AudioRendererMixerInput(
     const GetMixerCB& get_mixer_cb, const RemoveMixerCB& remove_mixer_cb)
     : playing_(false),
       initialized_(false),
       volume_(1.0f),
@@ skipping 69 matching lines @@
 
   mixer_->RemoveMixerInput(this);
   playing_ = false;
 }
 
 bool AudioRendererMixerInput::SetVolume(double volume) {
   volume_ = volume;
   return true;
 }
 
+void AudioRendererMixerInput::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const SwitchOutputDeviceCB& callback) {
+  DVLOG(1) << __FUNCTION__
+           << "(" << device_id << ", " << security_origin << ")";
+  if (mixer_) {
+    mixer_->SwitchOutputDevice(device_id, security_origin, callback);
+  } else {
+    callback.Run(SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED);
+  }
+}
+
 double AudioRendererMixerInput::ProvideInput(AudioBus* audio_bus,
                                              base::TimeDelta buffer_delay) {
   int frames_filled = callback_->Render(
       audio_bus, static_cast<int>(buffer_delay.InMillisecondsF() + 0.5));
 
   // AudioConverter expects unfilled frames to be zeroed.
   if (frames_filled < audio_bus->frames()) {
     audio_bus->ZeroFramesPartial(
         frames_filled, audio_bus->frames() - frames_filled);
   }
 
   return frames_filled > 0 ? volume_ : 0;
 }
 
 void AudioRendererMixerInput::OnRenderError() {
   callback_->OnRenderError();
 }
 
 }  // namespace media