Integrate HTMLMediaElement with Web Audio API's MediaElementAudioSourceNode

webkit/media/webmediaplayer_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 "webkit/media/webmediaplayer_impl.h"
 
 #include <limits>
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
+#include "content/renderer/media/audio_renderer_impl.h"
+#include "content/renderer/render_audiosourceprovider.h"
 #include "media/base/composite_data_source_factory.h"
 #include "media/base/filter_collection.h"
 #include "media/base/limits.h"
 #include "media/base/media_log.h"
 #include "media/base/media_switches.h"
 #include "media/base/pipeline_impl.h"
 #include "media/base/video_frame.h"
 #include "media/filters/chunk_demuxer_factory.h"
 #include "media/filters/dummy_demuxer_factory.h"
 #include "media/filters/ffmpeg_audio_decoder.h"
@@ skipping 71 matching lines @@
 }
 
 }  // namespace
 
 namespace webkit_media {
 
 WebMediaPlayerImpl::WebMediaPlayerImpl(
     WebKit::WebMediaPlayerClient* client,
     base::WeakPtr<WebMediaPlayerDelegate> delegate,
     media::FilterCollection* collection,
+    bool disable_audio,
     media::MessageLoopFactory* message_loop_factory,
     MediaStreamClient* media_stream_client,
     media::MediaLog* media_log)
     : network_state_(WebKit::WebMediaPlayer::Empty),
       ready_state_(WebKit::WebMediaPlayer::HaveNothing),
       main_loop_(NULL),
       filter_collection_(collection),
       pipeline_(NULL),
       message_loop_factory_(message_loop_factory),
       paused_(true),
       seeking_(false),
       playback_rate_(0.0f),
       pending_seek_(false),
       pending_seek_seconds_(0.0f),
       client_(client),
       proxy_(NULL),
       delegate_(delegate),
       media_stream_client_(media_stream_client),
       media_log_(media_log),
       is_accelerated_compositing_active_(false),
       incremented_externally_allocated_memory_(false) {
+  if (!disable_audio) {
+    // 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_.get());
+    collection->AddAudioRenderer(audio_renderer);
+  }
+
   // Saves the current message loop.
   DCHECK(!main_loop_);
   main_loop_ = MessageLoop::current();
   media_log_->AddEvent(
       media_log_->CreateEvent(media::MediaLogEvent::WEBMEDIAPLAYER_CREATED));
 }
 
 bool WebMediaPlayerImpl::Initialize(
     WebKit::WebFrame* frame,
     bool use_simple_data_source) {
@@ skipping 783 matching lines @@
     proxy_ = NULL;
   }
 }
 
 WebKit::WebMediaPlayerClient* WebMediaPlayerImpl::GetClient() {
   DCHECK_EQ(main_loop_, MessageLoop::current());
   DCHECK(client_);
   return client_;
 }
 
+WebKit::WebAudioSourceProvider* WebMediaPlayerImpl::audioSourceProvider() {
+  return audio_source_provider_;
+}
+
 void WebMediaPlayerImpl::IncrementExternallyAllocatedMemory() {
   DCHECK_EQ(main_loop_, MessageLoop::current());
   incremented_externally_allocated_memory_ = true;
   v8::V8::AdjustAmountOfExternalAllocatedMemory(kPlayerExtraMemory);
 }
 
 }  // namespace webkit_media