Associate audio streams with their source/destination RenderView.

content/renderer/media/renderer_webaudiodevice_impl.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 "content/renderer/media/renderer_webaudiodevice_impl.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
-#include "content/renderer/media/audio_device_factory.h"
+#include "content/renderer/media/audio_message_filter.h"
+#include "content/renderer/render_thread_impl.h"
+#include "content/renderer/render_view_impl.h"
 #include "media/base/media_switches.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 
 using WebKit::WebAudioDevice;
+using WebKit::WebFrame;
 using WebKit::WebVector;
+using WebKit::WebView;
 
 namespace content {
 
 RendererWebAudioDeviceImpl::RendererWebAudioDeviceImpl(
     const media::AudioParameters& params,
     WebAudioDevice::RenderCallback* callback)
     : is_running_(false),
       client_callback_(callback) {
-  audio_device_ = AudioDeviceFactory::NewOutputDevice();
+  audio_device_ = new media::AudioOutputDevice(
+      RenderThreadImpl::current()->audio_message_filter(),
+      RenderThreadImpl::current()->GetIOMessageLoopProxy());
 
   // TODO(crogers): remove once we properly handle input device selection.
   // https://code.google.com/p/chromium/issues/detail?id=147327
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableWebAudioInput)) {
     // TODO(crogers): support more than hard-coded stereo:
     // https://code.google.com/p/chromium/issues/detail?id=147326
     audio_device_->InitializeIO(params, 2, this);
   } else {
     audio_device_->Initialize(params, this);
   }
 }
 
 RendererWebAudioDeviceImpl::~RendererWebAudioDeviceImpl() {
   stop();
 }
 
 void RendererWebAudioDeviceImpl::start() {
   if (!is_running_) {
+    // Assumption: This method is being invoked within a V8 call stack.  CHECKs
+    // will fail in the call to frameForCurrentContext() otherwise.
+    //
+    // Therefore, we can perform look-ups to determine which RenderView is
+    // starting the audio device.  The reason for all this is because the
+    // creator of the WebAudio objects might not be the actual source of the
+    // audio (e.g., an extension creates a object that is passed and used within
+    // a page).
+    WebFrame* const web_frame = WebFrame::frameForCurrentContext();
+    WebView* const web_view = web_frame ? web_frame->view() : NULL;
+    RenderViewImpl* const render_view =
+        web_view ? RenderViewImpl::FromWebView(web_view) : NULL;
+    if (render_view) {
+      RenderThreadImpl::current()->audio_message_filter()->
+          AssociateStreamWithProducer(audio_device_->stream_id(),
+                                      render_view->routing_id());
+    }
+
     audio_device_->Start();
     is_running_ = true;
   }
 }
 
 void RendererWebAudioDeviceImpl::stop() {
   if (is_running_) {
     audio_device_->Stop();
     is_running_ = false;
   }
@@ skipping 32 matching lines @@
                              web_audio_data,
                              dest->frames());
   }
 }
 
 void RendererWebAudioDeviceImpl::OnRenderError() {
   // TODO(crogers): implement error handling.
 }
 
 }  // namespace content