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/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <utility>
#include "absl/memory/memory.h"
#include "call/rtp_transport_controller_send.h"
#include "modules/congestion_controller/include/send_side_congestion_controller.h"
#include "modules/congestion_controller/rtp/include/send_side_congestion_controller.h"
#include "rtc_base/location.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/field_trial.h"
namespace webrtc {
namespace {
const char kTaskQueueExperiment[] = "WebRTC-TaskQueueCongestionControl";
using TaskQueueController = webrtc::webrtc_cc::SendSideCongestionController;
bool TaskQueueExperimentEnabled() {
std::string trial = webrtc::field_trial::FindFullName(kTaskQueueExperiment);
return trial.find("Enable") == 0;
}
std::unique_ptr<SendSideCongestionControllerInterface> CreateController(
Clock* clock,
rtc::TaskQueue* task_queue,
webrtc::RtcEventLog* event_log,
PacedSender* pacer,
const BitrateConstraints& bitrate_config,
bool task_queue_controller,
NetworkControllerFactoryInterface* controller_factory) {
if (task_queue_controller) {
RTC_LOG(LS_INFO) << "Using TaskQueue based SSCC";
return absl::make_unique<webrtc::webrtc_cc::SendSideCongestionController>(
clock, task_queue, event_log, pacer, bitrate_config.start_bitrate_bps,
bitrate_config.min_bitrate_bps, bitrate_config.max_bitrate_bps,
controller_factory);
}
RTC_LOG(LS_INFO) << "Using Legacy SSCC";
auto cc = absl::make_unique<webrtc::SendSideCongestionController>(
clock, nullptr /* observer */, event_log, pacer);
cc->SignalNetworkState(kNetworkDown);
cc->SetBweBitrates(bitrate_config.min_bitrate_bps,
bitrate_config.start_bitrate_bps,
bitrate_config.max_bitrate_bps);
return std::move(cc);
}
} // namespace
RtpTransportControllerSend::RtpTransportControllerSend(
Clock* clock,
webrtc::RtcEventLog* event_log,
NetworkControllerFactoryInterface* controller_factory,
const BitrateConstraints& bitrate_config)
: clock_(clock),
pacer_(clock, &packet_router_, event_log),
bitrate_configurator_(bitrate_config),
process_thread_(ProcessThread::Create("SendControllerThread")),
observer_(nullptr),
task_queue_("rtp_send_controller") {
// Created after task_queue to be able to post to the task queue internally.
send_side_cc_ =
CreateController(clock, &task_queue_, event_log, &pacer_, bitrate_config,
TaskQueueExperimentEnabled(), controller_factory);
process_thread_->RegisterModule(&pacer_, RTC_FROM_HERE);
process_thread_->RegisterModule(send_side_cc_.get(), RTC_FROM_HERE);
process_thread_->Start();
}
RtpTransportControllerSend::~RtpTransportControllerSend() {
process_thread_->Stop();
process_thread_->DeRegisterModule(send_side_cc_.get());
process_thread_->DeRegisterModule(&pacer_);
}
void RtpTransportControllerSend::OnNetworkChanged(uint32_t bitrate_bps,
uint8_t fraction_loss,
int64_t rtt_ms,
int64_t probing_interval_ms) {
// TODO(srte): Skip this step when old SendSideCongestionController is
// deprecated.
TargetTransferRate msg;
msg.at_time = Timestamp::ms(clock_->TimeInMilliseconds());
msg.target_rate = DataRate::bps(bitrate_bps);
msg.network_estimate.at_time = msg.at_time;
msg.network_estimate.bwe_period = TimeDelta::ms(probing_interval_ms);
uint32_t bandwidth_bps;
if (send_side_cc_->AvailableBandwidth(&bandwidth_bps))
msg.network_estimate.bandwidth = DataRate::bps(bandwidth_bps);
msg.network_estimate.loss_rate_ratio = fraction_loss / 255.0;
msg.network_estimate.round_trip_time = TimeDelta::ms(rtt_ms);
if (!task_queue_.IsCurrent()) {
task_queue_.PostTask([this, msg] {
rtc::CritScope cs(&observer_crit_);
// We won't register as observer until we have an observer.
RTC_DCHECK(observer_ != nullptr);
observer_->OnTargetTransferRate(msg);
});
} else {
rtc::CritScope cs(&observer_crit_);
// We won't register as observer until we have an observer.
RTC_DCHECK(observer_ != nullptr);
observer_->OnTargetTransferRate(msg);
}
}
rtc::TaskQueue* RtpTransportControllerSend::GetWorkerQueue() {
return &task_queue_;
}
PacketRouter* RtpTransportControllerSend::packet_router() {
return &packet_router_;
}
TransportFeedbackObserver*
RtpTransportControllerSend::transport_feedback_observer() {
return send_side_cc_.get();
}
RtpPacketSender* RtpTransportControllerSend::packet_sender() {
return &pacer_;
}
const RtpKeepAliveConfig& RtpTransportControllerSend::keepalive_config() const {
return keepalive_;
}
void RtpTransportControllerSend::SetAllocatedSendBitrateLimits(
int min_send_bitrate_bps,
int max_padding_bitrate_bps,
int max_total_bitrate_bps) {
send_side_cc_->SetAllocatedSendBitrateLimits(
min_send_bitrate_bps, max_padding_bitrate_bps, max_total_bitrate_bps);
}
void RtpTransportControllerSend::SetKeepAliveConfig(
const RtpKeepAliveConfig& config) {
keepalive_ = config;
}
void RtpTransportControllerSend::SetPacingFactor(float pacing_factor) {
send_side_cc_->SetPacingFactor(pacing_factor);
}
void RtpTransportControllerSend::SetQueueTimeLimit(int limit_ms) {
pacer_.SetQueueTimeLimit(limit_ms);
}
CallStatsObserver* RtpTransportControllerSend::GetCallStatsObserver() {
return send_side_cc_.get();
}
void RtpTransportControllerSend::RegisterPacketFeedbackObserver(
PacketFeedbackObserver* observer) {
send_side_cc_->RegisterPacketFeedbackObserver(observer);
}
void RtpTransportControllerSend::DeRegisterPacketFeedbackObserver(
PacketFeedbackObserver* observer) {
send_side_cc_->DeRegisterPacketFeedbackObserver(observer);
}
void RtpTransportControllerSend::RegisterTargetTransferRateObserver(
TargetTransferRateObserver* observer) {
{
rtc::CritScope cs(&observer_crit_);
RTC_DCHECK(observer_ == nullptr);
observer_ = observer;
}
send_side_cc_->RegisterNetworkObserver(this);
}
void RtpTransportControllerSend::OnNetworkRouteChanged(
const std::string& transport_name,
const rtc::NetworkRoute& network_route) {
// Check if the network route is connected.
if (!network_route.connected) {
RTC_LOG(LS_INFO) << "Transport " << transport_name << " is disconnected";
// TODO(honghaiz): Perhaps handle this in SignalChannelNetworkState and
// consider merging these two methods.
return;
}
// Check whether the network route has changed on each transport.
auto result =
network_routes_.insert(std::make_pair(transport_name, network_route));
auto kv = result.first;
bool inserted = result.second;
if (inserted) {
// No need to reset BWE if this is the first time the network connects.
return;
}
if (kv->second != network_route) {
kv->second = network_route;
BitrateConstraints bitrate_config = bitrate_configurator_.GetConfig();
RTC_LOG(LS_INFO) << "Network route changed on transport " << transport_name
<< ": new local network id "
<< network_route.local_network_id
<< " new remote network id "
<< network_route.remote_network_id
<< " Reset bitrates to min: "
<< bitrate_config.min_bitrate_bps
<< " bps, start: " << bitrate_config.start_bitrate_bps
<< " bps, max: " << bitrate_config.max_bitrate_bps
<< " bps.";
RTC_DCHECK_GT(bitrate_config.start_bitrate_bps, 0);
send_side_cc_->OnNetworkRouteChanged(
network_route, bitrate_config.start_bitrate_bps,
bitrate_config.min_bitrate_bps, bitrate_config.max_bitrate_bps);
}
}
void RtpTransportControllerSend::OnNetworkAvailability(bool network_available) {
send_side_cc_->SignalNetworkState(network_available ? kNetworkUp
: kNetworkDown);
}
RtcpBandwidthObserver* RtpTransportControllerSend::GetBandwidthObserver() {
return send_side_cc_->GetBandwidthObserver();
}
int64_t RtpTransportControllerSend::GetPacerQueuingDelayMs() const {
return pacer_.QueueInMs();
}
int64_t RtpTransportControllerSend::GetFirstPacketTimeMs() const {
return pacer_.FirstSentPacketTimeMs();
}
void RtpTransportControllerSend::SetPerPacketFeedbackAvailable(bool available) {
send_side_cc_->SetPerPacketFeedbackAvailable(available);
}
void RtpTransportControllerSend::EnablePeriodicAlrProbing(bool enable) {
send_side_cc_->EnablePeriodicAlrProbing(enable);
}
void RtpTransportControllerSend::OnSentPacket(
const rtc::SentPacket& sent_packet) {
send_side_cc_->OnSentPacket(sent_packet);
}
void RtpTransportControllerSend::SetSdpBitrateParameters(
const BitrateConstraints& constraints) {
absl::optional<BitrateConstraints> updated =
bitrate_configurator_.UpdateWithSdpParameters(constraints);
if (updated.has_value()) {
send_side_cc_->SetBweBitrates(updated->min_bitrate_bps,
updated->start_bitrate_bps,
updated->max_bitrate_bps);
} else {
RTC_LOG(LS_VERBOSE)
<< "WebRTC.RtpTransportControllerSend.SetSdpBitrateParameters: "
<< "nothing to update";
}
}
void RtpTransportControllerSend::SetClientBitratePreferences(
const BitrateSettings& preferences) {
absl::optional<BitrateConstraints> updated =
bitrate_configurator_.UpdateWithClientPreferences(preferences);
if (updated.has_value()) {
send_side_cc_->SetBweBitrates(updated->min_bitrate_bps,
updated->start_bitrate_bps,
updated->max_bitrate_bps);
} else {
RTC_LOG(LS_VERBOSE)
<< "WebRTC.RtpTransportControllerSend.SetClientBitratePreferences: "
<< "nothing to update";
}
}
void RtpTransportControllerSend::SetAllocatedBitrateWithoutFeedback(
uint32_t bitrate_bps) {
send_side_cc_->SetAllocatedBitrateWithoutFeedback(bitrate_bps);
}
} // namespace webrtc