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// Copyright 2014 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/receiver/cast_receiver_impl.h"
#include <stddef.h>
#include <utility>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/trace_event/trace_event.h"
#include "media/cast/net/rtcp/rtcp_utility.h"
#include "media/cast/receiver/audio_decoder.h"
#include "media/cast/receiver/video_decoder.h"
namespace media {
namespace cast {
std::unique_ptr<CastReceiver> CastReceiver::Create(
scoped_refptr<CastEnvironment> cast_environment,
const FrameReceiverConfig& audio_config,
const FrameReceiverConfig& video_config,
CastTransport* const transport) {
return std::unique_ptr<CastReceiver>(new CastReceiverImpl(
cast_environment, audio_config, video_config, transport));
}
CastReceiverImpl::CastReceiverImpl(
scoped_refptr<CastEnvironment> cast_environment,
const FrameReceiverConfig& audio_config,
const FrameReceiverConfig& video_config,
CastTransport* const transport)
: cast_environment_(cast_environment),
audio_receiver_(cast_environment, audio_config, AUDIO_EVENT, transport),
video_receiver_(cast_environment, video_config, VIDEO_EVENT, transport),
ssrc_of_audio_sender_(audio_config.sender_ssrc),
ssrc_of_video_sender_(video_config.sender_ssrc),
num_audio_channels_(audio_config.channels),
audio_sampling_rate_(audio_config.rtp_timebase),
audio_codec_(audio_config.codec),
video_codec_(video_config.codec) {}
CastReceiverImpl::~CastReceiverImpl() = default;
void CastReceiverImpl::ReceivePacket(std::unique_ptr<Packet> packet) {
const uint8_t* const data = &packet->front();
const size_t length = packet->size();
uint32_t ssrc_of_sender;
if (IsRtcpPacket(data, length)) {
ssrc_of_sender = GetSsrcOfSender(data, length);
} else if (!RtpParser::ParseSsrc(data, length, &ssrc_of_sender)) {
VLOG(1) << "Invalid RTP packet.";
return;
}
base::WeakPtr<FrameReceiver> target;
if (ssrc_of_sender == ssrc_of_video_sender_) {
target = video_receiver_.AsWeakPtr();
} else if (ssrc_of_sender == ssrc_of_audio_sender_) {
target = audio_receiver_.AsWeakPtr();
} else {
VLOG(1) << "Dropping packet with a non matching sender SSRC: "
<< ssrc_of_sender;
return;
}
cast_environment_->PostTask(
CastEnvironment::MAIN,
FROM_HERE,
base::Bind(base::IgnoreResult(&FrameReceiver::ProcessPacket),
target,
base::Passed(&packet)));
}
void CastReceiverImpl::RequestDecodedAudioFrame(
const AudioFrameDecodedCallback& callback) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
DCHECK(!callback.is_null());
audio_receiver_.RequestEncodedFrame(base::Bind(
&CastReceiverImpl::DecodeEncodedAudioFrame,
// Note: Use of Unretained is safe since this Closure is guaranteed to be
// invoked or discarded by |audio_receiver_| before destruction of |this|.
base::Unretained(this),
callback));
}
void CastReceiverImpl::RequestEncodedAudioFrame(
const ReceiveEncodedFrameCallback& callback) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
audio_receiver_.RequestEncodedFrame(callback);
}
void CastReceiverImpl::RequestDecodedVideoFrame(
const VideoFrameDecodedCallback& callback) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
DCHECK(!callback.is_null());
video_receiver_.RequestEncodedFrame(base::Bind(
&CastReceiverImpl::DecodeEncodedVideoFrame,
// Note: Use of Unretained is safe since this Closure is guaranteed to be
// invoked or discarded by |video_receiver_| before destruction of |this|.
base::Unretained(this),
callback));
}
void CastReceiverImpl::RequestEncodedVideoFrame(
const ReceiveEncodedFrameCallback& callback) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
video_receiver_.RequestEncodedFrame(callback);
}
void CastReceiverImpl::DecodeEncodedAudioFrame(
const AudioFrameDecodedCallback& callback,
std::unique_ptr<EncodedFrame> encoded_frame) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
if (!encoded_frame) {
callback.Run(base::WrapUnique<AudioBus>(NULL), base::TimeTicks(), false);
return;
}
if (!audio_decoder_) {
audio_decoder_.reset(new AudioDecoder(cast_environment_,
num_audio_channels_,
audio_sampling_rate_,
audio_codec_));
}
const FrameId frame_id = encoded_frame->frame_id;
const RtpTimeTicks rtp_timestamp = encoded_frame->rtp_timestamp;
const base::TimeTicks playout_time = encoded_frame->reference_time;
audio_decoder_->DecodeFrame(
std::move(encoded_frame),
base::Bind(&CastReceiverImpl::EmitDecodedAudioFrame, cast_environment_,
callback, frame_id, rtp_timestamp, playout_time));
}
void CastReceiverImpl::DecodeEncodedVideoFrame(
const VideoFrameDecodedCallback& callback,
std::unique_ptr<EncodedFrame> encoded_frame) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
if (!encoded_frame) {
callback.Run(base::WrapRefCounted<VideoFrame>(NULL), base::TimeTicks(),
false);
return;
}
// Used by chrome/browser/extension/api/cast_streaming/performance_test.cc
TRACE_EVENT_INSTANT1("cast_perf_test", "PullEncodedVideoFrame",
TRACE_EVENT_SCOPE_THREAD, "rtp_timestamp",
encoded_frame->rtp_timestamp.lower_32_bits());
if (!video_decoder_)
video_decoder_.reset(new VideoDecoder(cast_environment_, video_codec_));
const FrameId frame_id = encoded_frame->frame_id;
const RtpTimeTicks rtp_timestamp = encoded_frame->rtp_timestamp;
const base::TimeTicks playout_time = encoded_frame->reference_time;
video_decoder_->DecodeFrame(
std::move(encoded_frame),
base::Bind(&CastReceiverImpl::EmitDecodedVideoFrame, cast_environment_,
callback, frame_id, rtp_timestamp, playout_time));
}
// static
void CastReceiverImpl::EmitDecodedAudioFrame(
const scoped_refptr<CastEnvironment>& cast_environment,
const AudioFrameDecodedCallback& callback,
FrameId frame_id,
RtpTimeTicks rtp_timestamp,
const base::TimeTicks& playout_time,
std::unique_ptr<AudioBus> audio_bus,
bool is_continuous) {
DCHECK(cast_environment->CurrentlyOn(CastEnvironment::MAIN));
if (audio_bus.get()) {
// TODO(miu): This is reporting incorrect timestamp and delay.
// http://crbug.com/547251
std::unique_ptr<FrameEvent> playout_event(new FrameEvent());
playout_event->timestamp = cast_environment->Clock()->NowTicks();
playout_event->type = FRAME_PLAYOUT;
playout_event->media_type = AUDIO_EVENT;
playout_event->rtp_timestamp = rtp_timestamp;
playout_event->frame_id = frame_id;
playout_event->delay_delta = playout_time - playout_event->timestamp;
cast_environment->logger()->DispatchFrameEvent(std::move(playout_event));
}
callback.Run(std::move(audio_bus), playout_time, is_continuous);
}
// static
void CastReceiverImpl::EmitDecodedVideoFrame(
const scoped_refptr<CastEnvironment>& cast_environment,
const VideoFrameDecodedCallback& callback,
FrameId frame_id,
RtpTimeTicks rtp_timestamp,
const base::TimeTicks& playout_time,
scoped_refptr<VideoFrame> video_frame,
bool is_continuous) {
DCHECK(cast_environment->CurrentlyOn(CastEnvironment::MAIN));
if (video_frame) {
// TODO(miu): This is reporting incorrect timestamp and delay.
// http://crbug.com/547251
std::unique_ptr<FrameEvent> playout_event(new FrameEvent());
playout_event->timestamp = cast_environment->Clock()->NowTicks();
playout_event->type = FRAME_PLAYOUT;
playout_event->media_type = VIDEO_EVENT;
playout_event->rtp_timestamp = rtp_timestamp;
playout_event->frame_id = frame_id;
playout_event->delay_delta = playout_time - playout_event->timestamp;
cast_environment->logger()->DispatchFrameEvent(std::move(playout_event));
// Used by chrome/browser/extension/api/cast_streaming/performance_test.cc
TRACE_EVENT_INSTANT2("cast_perf_test", "VideoFrameDecoded",
TRACE_EVENT_SCOPE_THREAD, "rtp_timestamp",
rtp_timestamp.lower_32_bits(), "playout_time",
(playout_time - base::TimeTicks()).InMicroseconds());
}
callback.Run(std::move(video_frame), playout_time, is_continuous);
}
} // namespace cast
} // namespace media
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