Integrate HTMLMediaElement with Web Audio API's MediaElementAudioSourceNode

content/renderer/render_view_impl.cc

 // Copyright (c) 2011 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/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include <vector>
@@ skipping 47 matching lines @@
 #include "content/renderer/java/java_bridge_dispatcher.h"
 #include "content/renderer/load_progress_tracker.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "content/renderer/media/audio_renderer_impl.h"
 #include "content/renderer/media/media_stream_impl.h"
 #include "content/renderer/media/render_media_log.h"
 #include "content/renderer/mhtml_generator.h"
 #include "content/renderer/notification_provider.h"
 #include "content/renderer/p2p/socket_dispatcher.h"
 #include "content/renderer/plugin_channel_host.h"
+#include "content/renderer/render_audiosourceprovider.h"
 #include "content/renderer/render_process.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/render_widget_fullscreen_pepper.h"
 #include "content/renderer/renderer_accessibility.h"
 #include "content/renderer/renderer_gpu_video_decoder_factories.h"
 #include "content/renderer/renderer_webapplicationcachehost_impl.h"
 #include "content/renderer/renderer_webstoragenamespace_impl.h"
 #include "content/renderer/speech_input_dispatcher.h"
 #include "content/renderer/text_input_client_observer.h"
 #include "content/renderer/v8_value_converter_impl.h"
@@ skipping 1846 matching lines @@
 WebMediaPlayer* RenderViewImpl::createMediaPlayer(
     WebFrame* frame, WebMediaPlayerClient* client) {
   FOR_EACH_OBSERVER(
       RenderViewObserver, observers_, WillCreateMediaPlayer(frame, client));
 
   media::MessageLoopFactory* message_loop_factory =
       new media::MessageLoopFactoryImpl();
   media::FilterCollection* collection = new media::FilterCollection();
   RenderMediaLog* render_media_log = new RenderMediaLog();
 
+  RenderAudioSourceProvider* audio_source_provider = NULL;
+
   // Add in any custom filter factories first.
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
   if (!cmd_line->HasSwitch(switches::kDisableAudio)) {
-    // Add the chrome specific audio renderer.
-    collection->AddAudioRenderer(new AudioRendererImpl());
+    // audio_source_provider is a "provider" to WebKit, and a sink
+    // from the perspective of the audio renderer.
+    audio_source_provider = new RenderAudioSourceProvider();
+
+    // Add the chrome specific audio renderer, using audio_source_provider
+    // as the sink.
+    AudioRendererImpl* audio_renderer =
+        new AudioRendererImpl(audio_source_provider);
+    collection->AddAudioRenderer(audio_renderer);
   }
 
 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
   // Currently only cros/arm has any HW video decode support in
   // GpuVideoDecodeAccelerator so we don't even try to use it on other
   // platforms.  This is a startup-time optimization.  When new VDA
   // implementations are added, relax the #if above.
   WebKit::WebGraphicsContext3D* wk_context3d = webview()->graphicsContext3D();
   if (wk_context3d) {
     WebGraphicsContext3DCommandBufferImpl* context3d =
         static_cast<WebGraphicsContext3DCommandBufferImpl*>(wk_context3d);
     GpuChannelHost* gpu_channel_host =
         RenderThreadImpl::current()->EstablishGpuChannelSync(
             content::CAUSE_FOR_GPU_LAUNCH_VIDEODECODEACCELERATOR_INITIALIZE);
     collection->AddVideoDecoder(new media::GpuVideoDecoder(
         MessageLoop::current(),
         new RendererGpuVideoDecoderFactories(
             gpu_channel_host, context3d->context()->AsWeakPtr())));
   }
 #endif
 
   webkit_media::WebMediaPlayerImpl* result_ptr;
   if (!content::GetContentClient()->renderer()->OverrideCreateWebMediaPlayer(
-      this, client, AsWeakPtr(), collection, message_loop_factory,
-      media_stream_impl_.get(), render_media_log, &result_ptr)) {
+      this, client, AsWeakPtr(), collection, audio_source_provider,
+      message_loop_factory, media_stream_impl_.get(), render_media_log,
+      &result_ptr)) {
     result_ptr = new webkit_media::WebMediaPlayerImpl(
-        client, AsWeakPtr(), collection, message_loop_factory,
-        media_stream_impl_.get(), render_media_log);
+        client, AsWeakPtr(), collection, audio_source_provider,
+        message_loop_factory, media_stream_impl_.get(), render_media_log);
   }
 
   DCHECK(result_ptr);
   scoped_ptr<webkit_media::WebMediaPlayerImpl> result;
   result.reset(result_ptr);
 
   if (!result->Initialize(frame,
                           cmd_line->HasSwitch(switches::kSimpleDataSource))) {
     return NULL;
   }
@@ skipping 2826 matching lines @@
 bool RenderViewImpl::WebWidgetHandlesCompositorScheduling() const {
   return !!RenderThreadImpl::current()->compositor_thread();
 }
 
 void RenderViewImpl::OnJavaBridgeInit() {
   DCHECK(!java_bridge_dispatcher_.get());
 #if defined(ENABLE_JAVA_BRIDGE)
   java_bridge_dispatcher_.reset(new JavaBridgeDispatcher(this));
 #endif
 }