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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/audio_sender/audio_sender.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "media/cast/audio_sender/audio_encoder.h"
#include "media/cast/transport/cast_transport_defines.h"
namespace media {
namespace cast {
const int64 kMinSchedulingDelayMs = 1;
class LocalRtcpAudioSenderFeedback : public RtcpSenderFeedback {
public:
explicit LocalRtcpAudioSenderFeedback(AudioSender* audio_sender)
: audio_sender_(audio_sender) {}
virtual void OnReceivedCastFeedback(const RtcpCastMessage& cast_feedback)
OVERRIDE {
if (!cast_feedback.missing_frames_and_packets_.empty()) {
audio_sender_->ResendPackets(cast_feedback.missing_frames_and_packets_);
}
VLOG(2) << "Received audio ACK "
<< static_cast<int>(cast_feedback.ack_frame_id_);
}
private:
AudioSender* audio_sender_;
DISALLOW_IMPLICIT_CONSTRUCTORS(LocalRtcpAudioSenderFeedback);
};
// TODO(mikhal): Reduce heap allocation when not needed.
AudioSender::AudioSender(scoped_refptr<CastEnvironment> cast_environment,
const AudioSenderConfig& audio_config,
transport::CastTransportSender* const transport_sender)
: cast_environment_(cast_environment),
transport_sender_(transport_sender),
rtp_stats_(audio_config.frequency),
rtcp_feedback_(new LocalRtcpAudioSenderFeedback(this)),
rtcp_(cast_environment,
rtcp_feedback_.get(),
transport_sender_,
NULL, // paced sender.
NULL,
audio_config.rtcp_mode,
base::TimeDelta::FromMilliseconds(audio_config.rtcp_interval),
audio_config.sender_ssrc,
audio_config.incoming_feedback_ssrc,
audio_config.rtcp_c_name),
timers_initialized_(false),
cast_initialization_cb_(STATUS_AUDIO_UNINITIALIZED),
weak_factory_(this) {
rtcp_.SetCastReceiverEventHistorySize(kReceiverRtcpEventHistorySize);
if (!audio_config.use_external_encoder) {
audio_encoder_.reset(
new AudioEncoder(cast_environment,
audio_config,
base::Bind(&AudioSender::SendEncodedAudioFrame,
weak_factory_.GetWeakPtr())));
cast_initialization_cb_ = audio_encoder_->InitializationResult();
}
transport_sender_->SubscribeAudioRtpStatsCallback(
base::Bind(&AudioSender::StoreStatistics, weak_factory_.GetWeakPtr()));
}
AudioSender::~AudioSender() {}
void AudioSender::InitializeTimers() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
if (!timers_initialized_) {
timers_initialized_ = true;
ScheduleNextRtcpReport();
}
}
void AudioSender::InsertAudio(scoped_ptr<AudioBus> audio_bus,
const base::TimeTicks& recorded_time) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
DCHECK(audio_encoder_.get()) << "Invalid internal state";
audio_encoder_->InsertAudio(audio_bus.Pass(), recorded_time);
}
void AudioSender::SendEncodedAudioFrame(
scoped_ptr<transport::EncodedAudioFrame> audio_frame,
const base::TimeTicks& recorded_time) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
InitializeTimers();
cast_environment_->PostTask(
CastEnvironment::TRANSPORT,
FROM_HERE,
base::Bind(&AudioSender::SendEncodedAudioFrameToTransport,
base::Unretained(this),
base::Passed(&audio_frame),
recorded_time));
}
void AudioSender::SendEncodedAudioFrameToTransport(
scoped_ptr<transport::EncodedAudioFrame> audio_frame,
const base::TimeTicks& recorded_time) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::TRANSPORT));
transport_sender_->InsertCodedAudioFrame(audio_frame.get(), recorded_time);
}
void AudioSender::ResendPackets(
const MissingFramesAndPacketsMap& missing_frames_and_packets) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
cast_environment_->PostTask(
CastEnvironment::TRANSPORT,
FROM_HERE,
base::Bind(&AudioSender::ResendPacketsOnTransportThread,
base::Unretained(this),
missing_frames_and_packets));
}
void AudioSender::IncomingRtcpPacket(scoped_ptr<Packet> packet) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
rtcp_.IncomingRtcpPacket(&packet->front(), packet->size());
}
void AudioSender::ScheduleNextRtcpReport() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
base::TimeDelta time_to_next =
rtcp_.TimeToSendNextRtcpReport() - cast_environment_->Clock()->NowTicks();
time_to_next = std::max(
time_to_next, base::TimeDelta::FromMilliseconds(kMinSchedulingDelayMs));
cast_environment_->PostDelayedTask(
CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&AudioSender::SendRtcpReport, weak_factory_.GetWeakPtr()),
time_to_next);
}
void AudioSender::StoreStatistics(
const transport::RtcpSenderInfo& sender_info,
base::TimeTicks time_sent,
uint32 rtp_timestamp) {
rtp_stats_.Store(sender_info, time_sent, rtp_timestamp);
}
void AudioSender::SendRtcpReport() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
// We don't send audio logging messages since all captured audio frames will
// be sent.
transport::RtcpSenderLogMessage empty_msg;
rtp_stats_.UpdateInfo(cast_environment_->Clock()->NowTicks());
rtcp_.SendRtcpFromRtpSender(empty_msg, rtp_stats_.sender_info());
ScheduleNextRtcpReport();
}
void AudioSender::ResendPacketsOnTransportThread(
const transport::MissingFramesAndPacketsMap& missing_packets) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::TRANSPORT));
transport_sender_->ResendPackets(true, missing_packets);
}
} // namespace cast
} // namespace media
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