Implement WebRTC in Chrome for TV

content/renderer/media/rtc_video_decoder_factory_tv.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_tv.h"
+
+#include "base/callback_helpers.h"
+#include "content/renderer/media/rtc_video_decoder_bridge_tv.h"
+#include "media/base/audio_decoder_config.h"
+#include "media/base/bind_to_loop.h"
+#include "media/base/decoder_buffer.h"
+#include "media/base/video_decoder_config.h"
+#include "third_party/libjingle/source/talk/base/ratetracker.h"
+
+using media::DemuxerStream;
+
+namespace content {
+
+// RTCDemuxerStream ------------------------------------------------------------
+
+class RTCDemuxerStream : public DemuxerStream {
+ public:
+  explicit RTCDemuxerStream(const gfx::Size& size);
+  virtual ~RTCDemuxerStream();
+
+  // DemuxerStream implementation.
+  virtual void Read(const ReadCB& read_cb) OVERRIDE;
+  virtual const media::AudioDecoderConfig& audio_decoder_config() OVERRIDE;
+  virtual const media::VideoDecoderConfig& video_decoder_config() OVERRIDE;
+  virtual Type type() OVERRIDE;
+  virtual void EnableBitstreamConverter() OVERRIDE;
+
+  void QueueBuffer(scoped_refptr<media::DecoderBuffer> buffer,
+                   const base::Closure& done_cb,
+                   const gfx::Size& new_size);
+  void Destroy();
+
+ private:
+  struct BufferEntry {
+    BufferEntry(const scoped_refptr<media::DecoderBuffer>& decoder_buffer_param,
+                const base::Closure& done_cb_param,
+                const gfx::Size& new_size_param)
+        : decoder_buffer(decoder_buffer_param),
+          done_cb(done_cb_param),
+          new_size(new_size_param) {}
+
+    scoped_refptr<media::DecoderBuffer> decoder_buffer;
+    base::Closure done_cb;
+    // When |!new_size.isEmpty()|, it means that config change with new size
+    // |new_size| happened.
+    gfx::Size new_size;
+  };
+
+  void RunReadCallback_Locked();
+
+  base::Lock lock_;
+  bool is_destroyed_;
+  std::queue<BufferEntry> buffer_queue_;
+  ReadCB read_cb_;
+  base::Closure pending_done_cb_;
+
+  media::AudioDecoderConfig dummy_audio_decoder_config_;
+  media::VideoDecoderConfig video_decoder_config_;
+  talk_base::RateTracker frame_rate_tracker_;
+};
+
+RTCDemuxerStream::RTCDemuxerStream(const gfx::Size& size)
+    : is_destroyed_(false),
+      video_decoder_config_(media::kCodecVP8,
+                            media::VP8PROFILE_MAIN,
+                            media::VideoFrame::NATIVE_TEXTURE,
+                            size,
+                            gfx::Rect(size),
+                            size,
+                            NULL,
+                            0,
+                            false) {}
+
+RTCDemuxerStream::~RTCDemuxerStream() { DCHECK(is_destroyed_); }
+
+const media::AudioDecoderConfig& RTCDemuxerStream::audio_decoder_config() {
+  NOTIMPLEMENTED() << "Does not support audio.";
+  return dummy_audio_decoder_config_;
+}
+
+const media::VideoDecoderConfig& RTCDemuxerStream::video_decoder_config() {
+  base::AutoLock lock(lock_);
+  return video_decoder_config_;
+}
+
+DemuxerStream::Type RTCDemuxerStream::type() { return DemuxerStream::VIDEO; }
+
+void RTCDemuxerStream::EnableBitstreamConverter() { NOTREACHED(); }
+
+void RTCDemuxerStream::QueueBuffer(scoped_refptr<media::DecoderBuffer> buffer,
+                                   const base::Closure& done_cb,
+                                   const gfx::Size& new_size) {
+  base::AutoLock lock(lock_);
+  if (is_destroyed_)
+    return;
+  buffer_queue_.push(BufferEntry(buffer, done_cb, new_size));
+  if (buffer)
+    frame_rate_tracker_.Update(1);
+  DVLOG(1) << "frame rate received : " << frame_rate_tracker_.units_second();
+  RunReadCallback_Locked();
+}
+
+void RTCDemuxerStream::Read(const ReadCB& read_cb) {
+  base::AutoLock lock(lock_);
+  DCHECK(read_cb_.is_null());
+  // A call to |Read| operation means that |MediaSourceDelegate| is done with
+  // the previous buffer.
+  if (!pending_done_cb_.is_null())
+    base::ResetAndReturn(&pending_done_cb_).Run();
+  read_cb_ = media::BindToLoop(base::MessageLoopProxy::current(), read_cb);
+  RunReadCallback_Locked();

[acolwell GONE FROM CHROMIUM, 2013/05/20 21:23:22]

Either put a DCHECK(!is_destroyed_) at the top or add code here to run the
read_cb_ with kAborted when is_destroyed == true.

[wonsik, 2013/05/21 10:09:29]

Done.

+}
+
+void RTCDemuxerStream::Destroy() {
+  base::AutoLock lock(lock_);
+  DCHECK(!is_destroyed_);
+  is_destroyed_ = true;
+  if (!read_cb_.is_null())
+    base::ResetAndReturn(&read_cb_).Run(DemuxerStream::kAborted, NULL);
+}

[acolwell GONE FROM CHROMIUM, 2013/05/20 21:23:22]

Should pending_done_cb_ and/or buffer_queue_ be cleared here as well?

[wonsik, 2013/05/21 10:09:29]

Done.

+
+void RTCDemuxerStream::RunReadCallback_Locked() {
+  if (read_cb_.is_null() || buffer_queue_.empty())
+    return;
+
+  BufferEntry& front = buffer_queue_.front();
+  if (!front.new_size.IsEmpty()) {
+    // No VideoFrame actually reaches GL renderer in Google TV case. We just
+    // make coded_size == visible_rect == natural_size here.
+    video_decoder_config_.Initialize(media::kCodecVP8,
+                                     media::VP8PROFILE_MAIN,
+                                     media::VideoFrame::NATIVE_TEXTURE,
+                                     front.new_size,
+                                     gfx::Rect(front.new_size),
+                                     front.new_size,
+                                     NULL,
+                                     0,
+                                     false,
+                                     false);
+    base::ResetAndReturn(&read_cb_).Run(DemuxerStream::kConfigChanged, NULL);
+    front.new_size.SetSize(0, 0);
+    return;
+  }
+  DCHECK(pending_done_cb_.is_null());
+  pending_done_cb_ = front.done_cb;
+  base::ResetAndReturn(&read_cb_).Run(DemuxerStream::kOk, front.decoder_buffer);
+  buffer_queue_.pop();
+}
+
+// RTCVideoDecoderFactoryTv ----------------------------------------------------
+
+RTCVideoDecoderFactoryTv::RTCVideoDecoderFactoryTv() : is_acquired_(false) {}
+RTCVideoDecoderFactoryTv::~RTCVideoDecoderFactoryTv() {}
+
+webrtc::VideoDecoder* RTCVideoDecoderFactoryTv::CreateVideoDecoder(
+    webrtc::VideoCodecType type) {
+  base::AutoLock lock(lock_);
+  // One decoder at a time!
+  if (decoder_)
+    return NULL;
+  // Only VP8 is supported --- returning NULL will make WebRTC fall back to SW
+  // decoder.
+  if (type != webrtc::kVideoCodecVP8)
+    return NULL;
+  decoder_.reset(new RTCVideoDecoderBridgeTv(this));
+  return decoder_.get();
+}
+
+void RTCVideoDecoderFactoryTv::DestroyVideoDecoder(
+    webrtc::VideoDecoder* decoder) {
+  base::AutoLock lock(lock_);
+  DCHECK(decoder_.get() == decoder);
+  decoder_.reset();
+}
+
+bool RTCVideoDecoderFactoryTv::AcquireDemuxer() {
+  base::AutoLock lock(lock_);
+  if (is_acquired_)
+    return false;
+  is_acquired_ = true;
+  return true;
+}
+
+void RTCVideoDecoderFactoryTv::ReleaseDemuxer() {
+  base::AutoLock lock(lock_);
+  DCHECK(is_acquired_);
+  is_acquired_ = false;
+  // Clean up internal state as a demuxer.
+  init_cb_.Reset();
+  if (stream_) {
+    stream_->Destroy();
+    stream_.reset();
+  }
+}
+
+void RTCVideoDecoderFactoryTv::Initialize(media::DemuxerHost*,
+                                          const media::PipelineStatusCB& cb) {
+  base::AutoLock lock(lock_);
+  init_cb_ = cb;
+  if (stream_)
+    base::ResetAndReturn(&init_cb_).Run(media::PIPELINE_OK);
+}
+
+DemuxerStream* RTCVideoDecoderFactoryTv::GetStream(DemuxerStream::Type type) {
+  base::AutoLock lock(lock_);
+  if (type == DemuxerStream::VIDEO)
+    return stream_.get();
+  return NULL;
+}
+
+base::TimeDelta RTCVideoDecoderFactoryTv::GetStartTime() const {
+  return base::TimeDelta();
+}
+
+void RTCVideoDecoderFactoryTv::InitializeStream(const gfx::Size& size) {
+  base::AutoLock lock(lock_);
+  DCHECK(!stream_);
+  stream_.reset(new RTCDemuxerStream(size));
+  if (!init_cb_.is_null())
+    base::ResetAndReturn(&init_cb_).Run(media::PIPELINE_OK);
+}
+
+void RTCVideoDecoderFactoryTv::QueueBuffer(
+    scoped_refptr<media::DecoderBuffer> buffer,
+    const base::Closure& done_cb,
+    const gfx::Size& new_size) {
+  base::AutoLock lock(lock_);
+  DCHECK(stream_);
+  stream_->QueueBuffer(buffer, done_cb, new_size);
+}
+
+}  // namespace content