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// Copyright (c) 2012 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.h"
#include <algorithm>
#include "base/bind.h"
#include "base/callback.h"
#include "base/message_loop.h"
#include "media/base/demuxer.h"
#include "media/base/limits.h"
#include "media/base/video_frame.h"
#include "media/base/video_util.h"
#include "third_party/libjingle/source/talk/base/timeutils.h"
#include "third_party/libjingle/source/talk/media/base/videoframe.h"
using media::CopyUPlane;
using media::CopyVPlane;
using media::CopyYPlane;
using media::DemuxerStream;
using media::kNoTimestamp;
using media::PIPELINE_OK;
using media::PipelineStatusCB;
using media::StatisticsCB;
using media::VideoDecoder;
RTCVideoDecoder::RTCVideoDecoder(base::TaskRunner* video_decoder_thread,
base::TaskRunner* main_thread,
webrtc::VideoTrackInterface* video_track)
: video_decoder_thread_(video_decoder_thread),
main_thread_(main_thread),
visible_size_(640, 480),
state_(kUnInitialized),
got_first_frame_(false),
video_track_(video_track) {
}
void RTCVideoDecoder::Initialize(const scoped_refptr<DemuxerStream>& stream,
const PipelineStatusCB& status_cb,
const StatisticsCB& statistics_cb) {
main_thread_->PostTask(
FROM_HERE,
base::Bind(&RTCVideoDecoder::RegisterToVideoTrack, this));
if (!video_decoder_thread_->RunsTasksOnCurrentThread()) {
video_decoder_thread_->PostTask(
FROM_HERE,
base::Bind(&RTCVideoDecoder::Initialize, this,
stream, status_cb, statistics_cb));
return;
}
state_ = kNormal;
status_cb.Run(PIPELINE_OK);
// TODO(acolwell): Implement stats.
}
void RTCVideoDecoder::Read(const ReadCB& read_cb) {
if (!video_decoder_thread_->RunsTasksOnCurrentThread()) {
video_decoder_thread_->PostTask(
FROM_HERE,
base::Bind(&RTCVideoDecoder::Read, this, read_cb));
return;
}
base::AutoLock auto_lock(lock_);
CHECK(read_cb_.is_null());
if (state_ == kStopped) {
read_cb.Run(kOk, NULL);
return;
}
read_cb_ = read_cb;
}
void RTCVideoDecoder::Reset(const base::Closure& closure) {
if (!video_decoder_thread_->RunsTasksOnCurrentThread()) {
video_decoder_thread_->PostTask(
FROM_HERE,
base::Bind(&RTCVideoDecoder::Reset, this, closure));
return;
}
CancelPendingRead();
closure.Run();
}
void RTCVideoDecoder::Stop(const base::Closure& closure) {
main_thread_->PostTask(
FROM_HERE,
base::Bind(&RTCVideoDecoder::DeregisterFromVideoTrack, this));
if (!video_decoder_thread_->RunsTasksOnCurrentThread()) {
video_decoder_thread_->PostTask(
FROM_HERE, base::Bind(&RTCVideoDecoder::Stop, this, closure));
return;
}
state_ = kStopped;
CancelPendingRead();
closure.Run();
}
void RTCVideoDecoder::SetSize(int width, int height) {
visible_size_.SetSize(width, height);
}
// TODO(wjia): this function can be split into two parts so that the |lock_|
// can be removed.
// First creates media::VideoFrame, then post a task onto |message_loop_|
// to deliver that frame.
void RTCVideoDecoder::RenderFrame(const cricket::VideoFrame* frame) {
// Called from libjingle thread.
DCHECK(frame);
base::TimeDelta timestamp = base::TimeDelta::FromMilliseconds(
frame->GetTimeStamp() / talk_base::kNumNanosecsPerMillisec);
ReadCB read_cb;
{
base::AutoLock auto_lock(lock_);
if (read_cb_.is_null() || state_ != kNormal) {
// TODO(ronghuawu): revisit TS adjustment when crbug.com/111672 is
// resolved.
if (got_first_frame_) {
start_time_ += timestamp - last_frame_timestamp_;
}
last_frame_timestamp_ = timestamp;
return;
}
std::swap(read_cb, read_cb_);
}
// Rebase timestamp with zero as starting point.
if (!got_first_frame_) {
start_time_ = timestamp;
got_first_frame_ = true;
}
// Always allocate a new frame.
//
// TODO(scherkus): migrate this to proper buffer recycling.
scoped_refptr<media::VideoFrame> video_frame =
media::VideoFrame::CreateFrame(media::VideoFrame::YV12,
visible_size_,
visible_size_,
timestamp - start_time_);
last_frame_timestamp_ = timestamp;
// Aspect ratio unsupported; DCHECK when there are non-square pixels.
DCHECK_EQ(frame->GetPixelWidth(), 1u);
DCHECK_EQ(frame->GetPixelHeight(), 1u);
int y_rows = frame->GetHeight();
int uv_rows = frame->GetHeight() / 2; // YV12 format.
CopyYPlane(frame->GetYPlane(), frame->GetYPitch(), y_rows, video_frame);
CopyUPlane(frame->GetUPlane(), frame->GetUPitch(), uv_rows, video_frame);
CopyVPlane(frame->GetVPlane(), frame->GetVPitch(), uv_rows, video_frame);
read_cb.Run(kOk, video_frame);
}
void RTCVideoDecoder::CancelPendingRead() {
DCHECK(video_decoder_thread_->RunsTasksOnCurrentThread());
ReadCB read_cb;
{
base::AutoLock auto_lock(lock_);
std::swap(read_cb, read_cb_);
}
if (!read_cb.is_null()) {
read_cb.Run(kOk, NULL);
}
}
void RTCVideoDecoder::RegisterToVideoTrack() {
DCHECK(main_thread_->RunsTasksOnCurrentThread());
if (video_track_)
video_track_->AddRenderer(this);
}
void RTCVideoDecoder::DeregisterFromVideoTrack() {
DCHECK(main_thread_->RunsTasksOnCurrentThread());
if (video_track_) {
video_track_->RemoveRenderer(this);
video_track_ = NULL;
}
}
RTCVideoDecoder::~RTCVideoDecoder() {
DCHECK_NE(kNormal, state_);
}
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