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/rtc_video_decoder.h"
+
+namespace content {
+
+RTCVideoDecoderFactory::RTCVideoDecoderFactory(
+    const scoped_refptr<media::GpuVideoDecoder::Factories>& gpu_factories)
+    : vda_loop_proxy_(gpu_factories->GetMessageLoop()) {
+  DVLOG(2) << "RTCVideoDecoderFactory";
+  // The decoder cannot be created in CreateVideoDecoder because VDA has to be
+  // created on |vda_loop_proxy_|, which can be the child thread. The child
+  // thread is blocked when CreateVideoDecoder runs. This supports only one
+  // VDA-powered <video> tag at a time.
+  // TODO(wuchengli): remove this restriction.
+  // |decoder_| can be null if VDA does not support VP8.
+  decoder_ = RTCVideoDecoder::Create(gpu_factories);
+}
+
+RTCVideoDecoderFactory::~RTCVideoDecoderFactory() {
+  DVLOG(2) << "~RTCVideoDecoderFactory";
+  if (decoder_) {
+    webrtc::VideoDecoder* decoder = decoder_.release();
+    if (!vda_loop_proxy_->DeleteSoon(FROM_HERE, decoder))
+      delete decoder;
+  }
+}
+
+webrtc::VideoDecoder* RTCVideoDecoderFactory::CreateVideoDecoder(
+    webrtc::VideoCodecType type) {
+  DVLOG(2) << "CreateVideoDecoder";
+  // Only VP8 is supported.
+  if (type == webrtc::kVideoCodecVP8)
+    return decoder_.release();
+  return NULL;
+}
+
+void RTCVideoDecoderFactory::DestroyVideoDecoder(
+    webrtc::VideoDecoder* decoder) {
+  DVLOG(2) << "DestroyVideoDecoder";
+  // Save back the decoder because it is the only one. VideoDecoder::Release
+  // should have been called.
+  decoder->RegisterDecodeCompleteCallback(NULL);
+  decoder_.reset(decoder);
+}
+
+}  // namespace content