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// 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/pepper/video_track_to_pepper_adapter.h"
#include <string>
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "base/trace_event/trace_event.h"
#include "content/public/renderer/media_stream_video_sink.h"
#include "content/renderer/media/stream/media_stream_registry_interface.h"
#include "media/base/bind_to_current_loop.h"
#include "media/capture/video_capture_types.h"
#include "third_party/WebKit/public/platform/WebMediaStream.h"
#include "third_party/WebKit/public/platform/WebURL.h"
#include "third_party/WebKit/public/web/WebMediaStreamRegistry.h"
#include "url/gurl.h"
namespace content {
// PpFrameReceiver implements MediaStreamVideoSink so that it can be attached
// to video track to receive captured frames.
// It can be attached to a FrameReaderInterface to output the received frame.
class PpFrameReceiver : public MediaStreamVideoSink {
public:
PpFrameReceiver(blink::WebMediaStreamTrack track)
: track_(track), reader_(nullptr), weak_factory_(this) {}
~PpFrameReceiver() override {}
void SetReader(FrameReaderInterface* reader) {
DCHECK((reader_ && !reader) || (!reader_ && reader))
<< " |reader| = " << reader << ", |reader_| = " << reader_;
if (reader) {
MediaStreamVideoSink::ConnectToTrack(
track_,
media::BindToCurrentLoop(base::Bind(&PpFrameReceiver::OnVideoFrame,
weak_factory_.GetWeakPtr())),
false);
} else {
MediaStreamVideoSink::DisconnectFromTrack();
weak_factory_.InvalidateWeakPtrs();
}
reader_ = reader;
}
void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
base::TimeTicks estimated_capture_time) {
TRACE_EVENT0("media", "PpFrameReceiver::OnVideoFrame");
if (reader_)
reader_->GotFrame(frame);
}
private:
const blink::WebMediaStreamTrack track_;
FrameReaderInterface* reader_;
base::WeakPtrFactory<PpFrameReceiver> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(PpFrameReceiver);
};
VideoTrackToPepperAdapter::VideoTrackToPepperAdapter(
MediaStreamRegistryInterface* registry)
: registry_(registry) {}
VideoTrackToPepperAdapter::~VideoTrackToPepperAdapter() {
for (const auto& reader_and_receiver : reader_to_receiver_)
delete reader_and_receiver.second;
}
bool VideoTrackToPepperAdapter::Open(const std::string& url,
FrameReaderInterface* reader) {
DCHECK(thread_checker_.CalledOnValidThread());
const blink::WebMediaStreamTrack& track = GetFirstVideoTrack(url);
if (track.IsNull())
return false;
reader_to_receiver_[reader] = new SourceInfo(track, reader);
return true;
}
bool VideoTrackToPepperAdapter::Close(FrameReaderInterface* reader) {
DCHECK(thread_checker_. CalledOnValidThread());
SourceInfoMap::iterator it = reader_to_receiver_.find(reader);
if (it == reader_to_receiver_.end())
return false;
delete it->second;
reader_to_receiver_.erase(it);
return true;
}
blink::WebMediaStreamTrack VideoTrackToPepperAdapter::GetFirstVideoTrack(
const std::string& url) {
DCHECK(thread_checker_.CalledOnValidThread());
const blink::WebMediaStream stream =
registry_ ? registry_->GetMediaStream(url)
: blink::WebMediaStreamRegistry::LookupMediaStreamDescriptor(
GURL(url));
if (stream.IsNull()) {
LOG(ERROR) << "GetFirstVideoSource - invalid url: " << url;
return blink::WebMediaStreamTrack();
}
// Get the first video track from the stream.
blink::WebVector<blink::WebMediaStreamTrack> video_tracks;
stream.VideoTracks(video_tracks);
if (video_tracks.IsEmpty()) {
LOG(ERROR) << "GetFirstVideoSource - no video tracks. url: " << url;
return blink::WebMediaStreamTrack();
}
return video_tracks[0];
}
void VideoTrackToPepperAdapter::DeliverFrameForTesting(
FrameReaderInterface* reader,
const scoped_refptr<media::VideoFrame>& frame) {
SourceInfoMap::const_iterator it = reader_to_receiver_.find(reader);
if (it == reader_to_receiver_.end())
return;
PpFrameReceiver* receiver = it->second->receiver_.get();
receiver->OnVideoFrame(frame, base::TimeTicks());
}
VideoTrackToPepperAdapter::SourceInfo::SourceInfo(
const blink::WebMediaStreamTrack& blink_track,
FrameReaderInterface* reader)
: receiver_(new PpFrameReceiver(blink_track)) {
receiver_->SetReader(reader);
}
VideoTrackToPepperAdapter::SourceInfo::~SourceInfo() {
receiver_->SetReader(nullptr);
}
} // namespace content
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