Associate audio streams with their source/destination RenderView.

content/renderer/media/render_audiosourceprovider.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/render_audiosourceprovider.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/renderer/media/audio_device_factory.h"
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
+#include "content/renderer/media/renderer_audio_output_device.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/base/audio_renderer_mixer_input.h"
 #include "media/base/media_switches.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProviderClient.h"
 
 using std::vector;
 using WebKit::WebVector;
 
 namespace content {
 
-RenderAudioSourceProvider::RenderAudioSourceProvider()
+RenderAudioSourceProvider::RenderAudioSourceProvider(int source_render_view_id)
     : is_initialized_(false),
       channels_(0),
       sample_rate_(0),
       is_running_(false),
       renderer_(NULL),
       client_(NULL) {
   // We create an AudioRendererSink here, but we don't yet know the audio format
   // (sample-rate, etc.) at this point.  Later, when Initialize() is called, we
   // have the audio format information and call AudioRendererSink::Initialize()
   // to fully initialize it.
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
 #if defined(OS_WIN) || defined(OS_MAC)
   const bool use_mixing =
       !cmd_line->HasSwitch(switches::kDisableRendererSideMixing);
 #else
   const bool use_mixing =
       cmd_line->HasSwitch(switches::kEnableRendererSideMixing);
 #endif
 
   if (use_mixing) {
     default_sink_ = RenderThreadImpl::current()->
         GetAudioRendererMixerManager()->CreateInput();
+    // TODO(miu): Partition mixer instances per RenderView.
   } else {
-    default_sink_ = AudioDeviceFactory::NewOutputDevice();
+    scoped_refptr<RendererAudioOutputDevice> device =
+        AudioDeviceFactory::NewOutputDevice();
+    // The RenderView creating RenderAudioSourceProvider will be the source of
+    // the audio (WebMediaPlayer is always associated with a single frame).
+    //
+    // TODO(miu): Unfortunately, there is one use case where this is not true:
+    // JavaScript code can call new Audio() and pass the object around.  The
+    // RenderAudioSourceProvider is not instantiated until the "src" attribute
+    // has been set.
+    device->SetSourceRenderView(source_render_view_id);
+    default_sink_ = device;
   }
 }
 
 void RenderAudioSourceProvider::setClient(
     WebKit::WebAudioSourceProviderClient* client) {
   // Synchronize with other uses of client_ and default_sink_.
   base::AutoLock auto_lock(sink_lock_);
 
   if (client && client != client_) {
     // Detach the audio renderer from normal playback.
@@ skipping 93 matching lines @@
     // Inform WebKit about the audio stream format.
     client_->setFormat(channels_, sample_rate_);
   }
 
   is_initialized_ = true;
 }
 
 RenderAudioSourceProvider::~RenderAudioSourceProvider() {}
 
 }  // namespace content