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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_renderer.h"
#include "base/bind.h"
#include "base/debug/trace_event.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop/message_loop_proxy.h"
#include "content/renderer/media/native_handle_impl.h"
#include "media/base/video_frame.h"
#include "media/base/video_util.h"
#include "third_party/libjingle/source/talk/media/base/videoframe.h"
using media::CopyYPlane;
using media::CopyUPlane;
using media::CopyVPlane;
namespace content {
RTCVideoRenderer::RTCVideoRenderer(
webrtc::VideoTrackInterface* video_track,
const base::Closure& error_cb,
const RepaintCB& repaint_cb)
: error_cb_(error_cb),
repaint_cb_(repaint_cb),
message_loop_proxy_(base::MessageLoopProxy::current()),
state_(kStopped),
video_track_(video_track) {
}
RTCVideoRenderer::~RTCVideoRenderer() {
}
void RTCVideoRenderer::Start() {
DCHECK(message_loop_proxy_->BelongsToCurrentThread());
DCHECK_EQ(state_, kStopped);
if (video_track_.get()) {
video_track_->AddRenderer(this);
video_track_->RegisterObserver(this);
}
state_ = kStarted;
MaybeRenderSignalingFrame();
}
void RTCVideoRenderer::Stop() {
DCHECK(message_loop_proxy_->BelongsToCurrentThread());
if (video_track_.get()) {
state_ = kStopped;
video_track_->RemoveRenderer(this);
video_track_->UnregisterObserver(this);
video_track_ = NULL;
}
}
void RTCVideoRenderer::Play() {
DCHECK(message_loop_proxy_->BelongsToCurrentThread());
if (video_track_.get() && state_ == kPaused) {
state_ = kStarted;
}
}
void RTCVideoRenderer::Pause() {
DCHECK(message_loop_proxy_->BelongsToCurrentThread());
if (video_track_.get() && state_ == kStarted) {
state_ = kPaused;
}
}
void RTCVideoRenderer::SetSize(int width, int height) {
}
void RTCVideoRenderer::RenderFrame(const cricket::VideoFrame* frame) {
base::TimeDelta timestamp = base::TimeDelta::FromMilliseconds(
frame->GetTimeStamp() / talk_base::kNumNanosecsPerMillisec);
TRACE_EVENT_INSTANT2("rtc_video_renderer",
"RenderFrame",
TRACE_EVENT_SCOPE_THREAD,
"elapsed time",
frame->GetElapsedTime(),
"timestamp_ms",
timestamp.InMilliseconds());
scoped_refptr<media::VideoFrame> video_frame;
if (frame->GetNativeHandle() != NULL) {
NativeHandleImpl* handle =
static_cast<NativeHandleImpl*>(frame->GetNativeHandle());
video_frame = static_cast<media::VideoFrame*>(handle->GetHandle());
video_frame->SetTimestamp(timestamp);
} else {
gfx::Size size(frame->GetWidth(), frame->GetHeight());
video_frame = media::VideoFrame::CreateFrame(
media::VideoFrame::YV12, size, gfx::Rect(size), size, 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.get());
CopyUPlane(
frame->GetUPlane(), frame->GetUPitch(), uv_rows, video_frame.get());
CopyVPlane(
frame->GetVPlane(), frame->GetVPitch(), uv_rows, video_frame.get());
}
message_loop_proxy_->PostTask(
FROM_HERE, base::Bind(&RTCVideoRenderer::DoRenderFrameOnMainThread,
this, video_frame));
}
void RTCVideoRenderer::OnChanged() {
DCHECK(message_loop_proxy_->BelongsToCurrentThread());
MaybeRenderSignalingFrame();
}
void RTCVideoRenderer::MaybeRenderSignalingFrame() {
// Render a small black frame if the track transition to ended.
// This is necessary to make sure audio can play if the video tag src is
// a MediaStream video track that has been rejected or ended.
if (video_track_->state() == webrtc::MediaStreamTrackInterface::kEnded) {
const int kMinFrameSize = 2;
const gfx::Size size(kMinFrameSize, kMinFrameSize);
scoped_refptr<media::VideoFrame> video_frame =
media::VideoFrame::CreateBlackFrame(size);
DoRenderFrameOnMainThread(video_frame);
}
}
void RTCVideoRenderer::DoRenderFrameOnMainThread(
scoped_refptr<media::VideoFrame> video_frame) {
DCHECK(message_loop_proxy_->BelongsToCurrentThread());
if (state_ != kStarted) {
return;
}
TRACE_EVENT0("video", "DoRenderFrameOnMainThread");
repaint_cb_.Run(video_frame);
}
} // namespace content
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