Integrate VDA with WebRTC.

content/renderer/media/rtc_video_decoder_factory.cc

+// Copyright (c) 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 "content/renderer/media/rtc_video_decoder_factory.h"
+
+#include "base/location.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/renderer/media/renderer_gpu_video_decoder_factories.h"
+#include "content/renderer/media/rtc_video_decoder.h"
+
+namespace content {
+
+RTCVideoDecoderFactory::RTCVideoDecoderFactory(
+    const scoped_refptr<RendererGpuVideoDecoderFactories>& gpu_factories,
+    base::Thread* vda_thread)
+    : gpu_factories_(gpu_factories),
+      vda_thread_(vda_thread) {
+}
+
+webrtc::VideoDecoder* RTCVideoDecoderFactory::CreateVideoDecoder(
+    webrtc::VideoCodecType type) {
+  // RendererGpuVideoDecoderFactories is not thread-safe. Make a copy.
+  scoped_ptr<RTCVideoDecoder> decoder(
+      new RTCVideoDecoder(gpu_factories_->Copy()));

[wuchengli, 2013/06/10 15:24:22]

This is a little bit ugly. But I think this is the best place to inject a
gpu_factories for every decoder. 

+  vda_thread_->message_loop()->AddDestructionObserver(decoder.get());

[Ami GONE FROM CHROMIUM, 2013/06/11 23:48:05]

I think .get() is no longer needed.

[Ami GONE FROM CHROMIUM, 2013/06/11 23:48:05]

Is vda_thread_->message_loop() != gpu_factories_->GetMessageLoop() ?
(can vda_thread_ drop from this class?)

[wuchengli, 2013/06/13 10:28:07]

No. We need MessageLoop, not MessageLoopProxy. Only MessageLoop has 
AddDestructionObserver.

[wuchengli, 2013/06/13 10:28:07]

Done. AddDestructionObserver is moved to ctor of RTCVideoDecoder to make it
symmetrical.

+  if (decoder->Initialize(type))
+    return decoder.release();
+  // Initialize will fail when the codec is not supported.
+  return NULL;
+}
+
+void RTCVideoDecoderFactory::DestroyVideoDecoder(
+    webrtc::VideoDecoder* decoder) {
+  gpu_factories_->GetMessageLoop()->DeleteSoon(FROM_HERE, decoder);
+}
+
+}  // namespace content