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// Copyright 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 "media/cast/cast_receiver_impl.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
namespace media {
namespace cast {
// The callback should not be used, as the receiver is using the external
// transport. Implementation is required as the pacer is common to sender and
// receiver.
static void DoNothingCastTransportStatus(
transport::CastTransportStatus status) {
NOTREACHED() << "Internal transport used in CastReceiver";
}
// The video and audio receivers should only be called from the main thread.
// LocalFrameReciever posts tasks to the main thread, making the cast interface
// thread safe.
class LocalFrameReceiver : public FrameReceiver {
public:
LocalFrameReceiver(scoped_refptr<CastEnvironment> cast_environment,
AudioReceiver* audio_receiver,
VideoReceiver* video_receiver)
: cast_environment_(cast_environment),
audio_receiver_(audio_receiver),
video_receiver_(video_receiver) {}
virtual void GetRawVideoFrame(const VideoFrameDecodedCallback& callback)
OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&VideoReceiver::GetRawVideoFrame,
video_receiver_->AsWeakPtr(),
callback));
}
virtual void GetEncodedVideoFrame(const VideoFrameEncodedCallback& callback)
OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&VideoReceiver::GetEncodedVideoFrame,
video_receiver_->AsWeakPtr(),
callback));
}
virtual void GetRawAudioFrame(int number_of_10ms_blocks,
int desired_frequency,
const AudioFrameDecodedCallback& callback)
OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&AudioReceiver::GetRawAudioFrame,
audio_receiver_->AsWeakPtr(),
number_of_10ms_blocks,
desired_frequency,
callback));
}
virtual void GetCodedAudioFrame(const AudioFrameEncodedCallback& callback)
OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&AudioReceiver::GetEncodedAudioFrame,
audio_receiver_->AsWeakPtr(),
callback));
}
protected:
virtual ~LocalFrameReceiver() {}
private:
friend class base::RefCountedThreadSafe<LocalFrameReceiver>;
scoped_refptr<CastEnvironment> cast_environment_;
AudioReceiver* audio_receiver_;
VideoReceiver* video_receiver_;
};
CastReceiver* CastReceiver::CreateCastReceiver(
scoped_refptr<CastEnvironment> cast_environment,
const AudioReceiverConfig& audio_config,
const VideoReceiverConfig& video_config,
transport::PacketSender* const packet_sender) {
return new CastReceiverImpl(
cast_environment, audio_config, video_config, packet_sender);
}
CastReceiverImpl::CastReceiverImpl(
scoped_refptr<CastEnvironment> cast_environment,
const AudioReceiverConfig& audio_config,
const VideoReceiverConfig& video_config,
transport::PacketSender* const packet_sender)
: pacer_(cast_environment->Clock(),
packet_sender,
cast_environment->GetTaskRunner(CastEnvironment::TRANSPORT)),
audio_receiver_(cast_environment, audio_config, &pacer_),
video_receiver_(cast_environment, video_config, &pacer_),
frame_receiver_(new LocalFrameReceiver(cast_environment,
&audio_receiver_,
&video_receiver_)),
cast_environment_(cast_environment),
ssrc_of_audio_sender_(audio_config.incoming_ssrc),
ssrc_of_video_sender_(video_config.incoming_ssrc) {}
CastReceiverImpl::~CastReceiverImpl() {}
// The video and audio receivers should only be called from the main thread.
void CastReceiverImpl::ReceivedPacket(scoped_ptr<Packet> packet) {
const uint8_t* data = &packet->front();
size_t length = packet->size();
if (length < kMinLengthOfRtcp) {
VLOG(1) << "Received a packet which is too short " << length;
return;
}
uint32 ssrc_of_sender;
if (!Rtcp::IsRtcpPacket(data, length)) {
if (length < kMinLengthOfRtp) {
VLOG(1) << "Received a RTP packet which is too short " << length;
return;
}
ssrc_of_sender = RtpReceiver::GetSsrcOfSender(data, length);
} else {
ssrc_of_sender = Rtcp::GetSsrcOfSender(data, length);
}
if (ssrc_of_sender == ssrc_of_audio_sender_) {
cast_environment_->PostTask(CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&AudioReceiver::IncomingPacket,
audio_receiver_.AsWeakPtr(),
base::Passed(&packet)));
} else if (ssrc_of_sender == ssrc_of_video_sender_) {
cast_environment_->PostTask(CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&VideoReceiver::IncomingPacket,
video_receiver_.AsWeakPtr(),
base::Passed(&packet)));
} else {
VLOG(1) << "Received a packet with a non matching sender SSRC "
<< ssrc_of_sender;
}
}
transport::PacketReceiverCallback CastReceiverImpl::packet_receiver() {
return base::Bind(&CastReceiverImpl::ReceivedPacket, base::Unretained(this));
}
scoped_refptr<FrameReceiver> CastReceiverImpl::frame_receiver() {
return frame_receiver_;
}
} // namespace cast
} // namespace media
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