Prime the landing pad for the new video rendering pipeline.

media/blink/webmediaplayer_impl.cc

 // Copyright 2013 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/blink/webmediaplayer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 #include <vector>
@@ skipping 115 matching lines @@
       ended_(false),
       pending_seek_(false),
       pending_seek_seconds_(0.0f),
       should_notify_time_changed_(false),
       client_(client),
       delegate_(delegate),
       defer_load_cb_(params.defer_load_cb()),
       context_3d_cb_(params.context_3d_cb()),
       supports_save_(true),
       chunk_demuxer_(NULL),
-      compositor_task_runner_(params.compositor_task_runner()),
+      // Threaded compositing isn't enabled universally yet.
+      compositor_task_runner_(
+          params.compositor_task_runner()
+              ? params.compositor_task_runner()
+              : base::MessageLoop::current()->task_runner()),
       compositor_(new VideoFrameCompositor(
+          compositor_task_runner_,
           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnNaturalSizeChanged),
           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnOpacityChanged))),
       encrypted_media_support_(cdm_factory,
                                client,
                                params.media_permission(),
                                base::Bind(&WebMediaPlayerImpl::SetCdm,
                                           AsWeakPtr(),
                                           base::Bind(&IgnoreCdmAttached))),
       renderer_factory_(renderer_factory.Pass()) {
-  // Threaded compositing isn't enabled universally yet.
-  if (!compositor_task_runner_.get())
-    compositor_task_runner_ = base::MessageLoopProxy::current();
-
   media_log_->AddEvent(
       media_log_->CreateEvent(MediaLogEvent::WEBMEDIAPLAYER_CREATED));
 
   if (params.initial_cdm()) {
     SetCdm(base::Bind(&IgnoreCdmAttached),
            ToWebContentDecryptionModuleImpl(params.initial_cdm())
                ->GetCdmContext());
   }
 
   // TODO(xhwang): When we use an external Renderer, many methods won't work,
@@ skipping 734 matching lines @@
         BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDemuxerOpened),
         encrypted_media_init_data_cb, mse_log_cb, media_log_, true);
     demuxer_.reset(chunk_demuxer_);
   }
 
   // ... and we're ready to go!
   seeking_ = true;
 
   pipeline_.Start(
       demuxer_.get(),
-      renderer_factory_->CreateRenderer(media_task_runner_,
-                                        audio_source_provider_.get()),
+      renderer_factory_->CreateRenderer(
+          media_task_runner_, audio_source_provider_.get(), compositor_),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineEnded),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineError),
       BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnPipelineSeeked, false),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineMetadata),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineBufferingStateChanged),
-      base::Bind(&WebMediaPlayerImpl::FrameReady, base::Unretained(this)),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDurationChanged),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnAddTextTrack),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnWaitingForDecryptionKey));
 }
 
 void WebMediaPlayerImpl::SetNetworkState(WebMediaPlayer::NetworkState state) {
   DVLOG(1) << __FUNCTION__ << "(" << state << ")";
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   network_state_ = state;
   // Always notify to ensure client has the latest value.
@@ skipping 50 matching lines @@
 
 void WebMediaPlayerImpl::OnOpacityChanged(bool opaque) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);
 
   opaque_ = opaque;
   if (video_weblayer_)
     video_weblayer_->setOpaque(opaque_);
 }
 
-void WebMediaPlayerImpl::FrameReady(
-    const scoped_refptr<VideoFrame>& frame) {
-  compositor_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&VideoFrameCompositor::UpdateCurrentFrame,
-                 base::Unretained(compositor_),
-                 frame));
-}
-
 static void GetCurrentFrameAndSignal(
     VideoFrameCompositor* compositor,
     scoped_refptr<VideoFrame>* video_frame_out,
     base::WaitableEvent* event) {
   TRACE_EVENT0("media", "GetCurrentFrameAndSignal");
-  *video_frame_out = compositor->GetCurrentFrame();
+  *video_frame_out = compositor->GetCurrentFrameAndUpdateIfStale();
   event->Signal();
 }
 
 scoped_refptr<VideoFrame>
 WebMediaPlayerImpl::GetCurrentFrameFromCompositor() {
   TRACE_EVENT0("media", "WebMediaPlayerImpl::GetCurrentFrameFromCompositor");
   if (compositor_task_runner_->BelongsToCurrentThread())
     return compositor_->GetCurrentFrame();
 
   // Use a posted task and waitable event instead of a lock otherwise
@@ skipping 14 matching lines @@
 
   // pause() may be called after playback has ended and the HTMLMediaElement
   // requires that currentTime() == duration() after ending.  We want to ensure
   // |paused_time_| matches currentTime() in this case or a future seek() may
   // incorrectly discard what it thinks is a seek to the existing time.
   paused_time_ =
       ended_ ? pipeline_.GetMediaDuration() : pipeline_.GetMediaTime();
 }
 
 }  // namespace media