| /* |
| * 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 "call/rtp_transport_controller_send.h" |
| |
| #include <memory> |
| #include <utility> |
| #include <vector> |
| |
| #include "absl/strings/match.h" |
| #include "absl/types/optional.h" |
| #include "api/transport/goog_cc_factory.h" |
| #include "api/transport/network_types.h" |
| #include "api/units/data_rate.h" |
| #include "api/units/time_delta.h" |
| #include "api/units/timestamp.h" |
| #include "call/rtp_video_sender.h" |
| #include "logging/rtc_event_log/events/rtc_event_remote_estimate.h" |
| #include "logging/rtc_event_log/events/rtc_event_route_change.h" |
| #include "modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/rate_limiter.h" |
| |
| namespace webrtc { |
| namespace { |
| static const int64_t kRetransmitWindowSizeMs = 500; |
| static const size_t kMaxOverheadBytes = 500; |
| |
| constexpr TimeDelta kPacerQueueUpdateInterval = TimeDelta::Millis(25); |
| |
| TargetRateConstraints ConvertConstraints(int min_bitrate_bps, |
| int max_bitrate_bps, |
| int start_bitrate_bps, |
| Clock* clock) { |
| TargetRateConstraints msg; |
| msg.at_time = Timestamp::Millis(clock->TimeInMilliseconds()); |
| msg.min_data_rate = min_bitrate_bps >= 0 |
| ? DataRate::BitsPerSec(min_bitrate_bps) |
| : DataRate::Zero(); |
| msg.max_data_rate = max_bitrate_bps > 0 |
| ? DataRate::BitsPerSec(max_bitrate_bps) |
| : DataRate::Infinity(); |
| if (start_bitrate_bps > 0) |
| msg.starting_rate = DataRate::BitsPerSec(start_bitrate_bps); |
| return msg; |
| } |
| |
| TargetRateConstraints ConvertConstraints(const BitrateConstraints& contraints, |
| Clock* clock) { |
| return ConvertConstraints(contraints.min_bitrate_bps, |
| contraints.max_bitrate_bps, |
| contraints.start_bitrate_bps, clock); |
| } |
| |
| bool IsEnabled(const WebRtcKeyValueConfig* trials, absl::string_view key) { |
| RTC_DCHECK(trials != nullptr); |
| return absl::StartsWith(trials->Lookup(key), "Enabled"); |
| } |
| |
| bool IsRelayed(const rtc::NetworkRoute& route) { |
| return route.local.uses_turn() || route.remote.uses_turn(); |
| } |
| |
| } // namespace |
| |
| RtpTransportControllerSend::RtpTransportControllerSend( |
| Clock* clock, |
| webrtc::RtcEventLog* event_log, |
| NetworkStatePredictorFactoryInterface* predictor_factory, |
| NetworkControllerFactoryInterface* controller_factory, |
| const BitrateConstraints& bitrate_config, |
| std::unique_ptr<ProcessThread> process_thread, |
| TaskQueueFactory* task_queue_factory, |
| const WebRtcKeyValueConfig* trials) |
| : clock_(clock), |
| event_log_(event_log), |
| bitrate_configurator_(bitrate_config), |
| process_thread_(std::move(process_thread)), |
| use_task_queue_pacer_(IsEnabled(trials, "WebRTC-TaskQueuePacer")), |
| process_thread_pacer_(use_task_queue_pacer_ |
| ? nullptr |
| : new PacedSender(clock, |
| &packet_router_, |
| event_log, |
| trials, |
| process_thread_.get())), |
| task_queue_pacer_( |
| use_task_queue_pacer_ |
| ? new TaskQueuePacedSender( |
| clock, |
| &packet_router_, |
| event_log, |
| trials, |
| task_queue_factory, |
| /*hold_back_window = */ PacingController::kMinSleepTime) |
| : nullptr), |
| observer_(nullptr), |
| controller_factory_override_(controller_factory), |
| controller_factory_fallback_( |
| std::make_unique<GoogCcNetworkControllerFactory>(predictor_factory)), |
| process_interval_(controller_factory_fallback_->GetProcessInterval()), |
| last_report_block_time_(Timestamp::Millis(clock_->TimeInMilliseconds())), |
| reset_feedback_on_route_change_( |
| !IsEnabled(trials, "WebRTC-Bwe-NoFeedbackReset")), |
| send_side_bwe_with_overhead_( |
| IsEnabled(trials, "WebRTC-SendSideBwe-WithOverhead")), |
| add_pacing_to_cwin_( |
| IsEnabled(trials, "WebRTC-AddPacingToCongestionWindowPushback")), |
| relay_bandwidth_cap_("relay_cap", DataRate::PlusInfinity()), |
| transport_overhead_bytes_per_packet_(0), |
| network_available_(false), |
| retransmission_rate_limiter_(clock, kRetransmitWindowSizeMs), |
| task_queue_(task_queue_factory->CreateTaskQueue( |
| "rtp_send_controller", |
| TaskQueueFactory::Priority::NORMAL)) { |
| ParseFieldTrial({&relay_bandwidth_cap_}, |
| trials->Lookup("WebRTC-Bwe-NetworkRouteConstraints")); |
| initial_config_.constraints = ConvertConstraints(bitrate_config, clock_); |
| initial_config_.event_log = event_log; |
| initial_config_.key_value_config = trials; |
| RTC_DCHECK(bitrate_config.start_bitrate_bps > 0); |
| |
| pacer()->SetPacingRates( |
| DataRate::BitsPerSec(bitrate_config.start_bitrate_bps), DataRate::Zero()); |
| |
| if (!use_task_queue_pacer_) { |
| process_thread_->Start(); |
| } |
| } |
| |
| RtpTransportControllerSend::~RtpTransportControllerSend() { |
| if (!use_task_queue_pacer_) { |
| process_thread_->Stop(); |
| } |
| } |
| |
| RtpVideoSenderInterface* RtpTransportControllerSend::CreateRtpVideoSender( |
| std::map<uint32_t, RtpState> suspended_ssrcs, |
| const std::map<uint32_t, RtpPayloadState>& states, |
| const RtpConfig& rtp_config, |
| int rtcp_report_interval_ms, |
| Transport* send_transport, |
| const RtpSenderObservers& observers, |
| RtcEventLog* event_log, |
| std::unique_ptr<FecController> fec_controller, |
| const RtpSenderFrameEncryptionConfig& frame_encryption_config, |
| rtc::scoped_refptr<FrameTransformerInterface> frame_transformer) { |
| video_rtp_senders_.push_back(std::make_unique<RtpVideoSender>( |
| clock_, suspended_ssrcs, states, rtp_config, rtcp_report_interval_ms, |
| send_transport, observers, |
| // TODO(holmer): Remove this circular dependency by injecting |
| // the parts of RtpTransportControllerSendInterface that are really used. |
| this, event_log, &retransmission_rate_limiter_, std::move(fec_controller), |
| frame_encryption_config.frame_encryptor, |
| frame_encryption_config.crypto_options, std::move(frame_transformer))); |
| return video_rtp_senders_.back().get(); |
| } |
| |
| void RtpTransportControllerSend::DestroyRtpVideoSender( |
| RtpVideoSenderInterface* rtp_video_sender) { |
| std::vector<std::unique_ptr<RtpVideoSenderInterface>>::iterator it = |
| video_rtp_senders_.end(); |
| for (it = video_rtp_senders_.begin(); it != video_rtp_senders_.end(); ++it) { |
| if (it->get() == rtp_video_sender) { |
| break; |
| } |
| } |
| RTC_DCHECK(it != video_rtp_senders_.end()); |
| video_rtp_senders_.erase(it); |
| } |
| |
| void RtpTransportControllerSend::UpdateControlState() { |
| absl::optional<TargetTransferRate> update = control_handler_->GetUpdate(); |
| if (!update) |
| return; |
| retransmission_rate_limiter_.SetMaxRate(update->target_rate.bps()); |
| // We won't create control_handler_ until we have an observers. |
| RTC_DCHECK(observer_ != nullptr); |
| observer_->OnTargetTransferRate(*update); |
| } |
| |
| RtpPacketPacer* RtpTransportControllerSend::pacer() { |
| if (use_task_queue_pacer_) { |
| return task_queue_pacer_.get(); |
| } |
| return process_thread_pacer_.get(); |
| } |
| |
| const RtpPacketPacer* RtpTransportControllerSend::pacer() const { |
| if (use_task_queue_pacer_) { |
| return task_queue_pacer_.get(); |
| } |
| return process_thread_pacer_.get(); |
| } |
| |
| rtc::TaskQueue* RtpTransportControllerSend::GetWorkerQueue() { |
| return &task_queue_; |
| } |
| |
| PacketRouter* RtpTransportControllerSend::packet_router() { |
| return &packet_router_; |
| } |
| |
| NetworkStateEstimateObserver* |
| RtpTransportControllerSend::network_state_estimate_observer() { |
| return this; |
| } |
| |
| TransportFeedbackObserver* |
| RtpTransportControllerSend::transport_feedback_observer() { |
| return this; |
| } |
| |
| RtpPacketSender* RtpTransportControllerSend::packet_sender() { |
| if (use_task_queue_pacer_) { |
| return task_queue_pacer_.get(); |
| } |
| return process_thread_pacer_.get(); |
| } |
| |
| void RtpTransportControllerSend::SetAllocatedSendBitrateLimits( |
| BitrateAllocationLimits limits) { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| streams_config_.min_total_allocated_bitrate = limits.min_allocatable_rate; |
| streams_config_.max_padding_rate = limits.max_padding_rate; |
| streams_config_.max_total_allocated_bitrate = limits.max_allocatable_rate; |
| UpdateStreamsConfig(); |
| } |
| void RtpTransportControllerSend::SetPacingFactor(float pacing_factor) { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| streams_config_.pacing_factor = pacing_factor; |
| UpdateStreamsConfig(); |
| } |
| void RtpTransportControllerSend::SetQueueTimeLimit(int limit_ms) { |
| pacer()->SetQueueTimeLimit(TimeDelta::Millis(limit_ms)); |
| } |
| StreamFeedbackProvider* |
| RtpTransportControllerSend::GetStreamFeedbackProvider() { |
| return &feedback_demuxer_; |
| } |
| |
| void RtpTransportControllerSend::RegisterTargetTransferRateObserver( |
| TargetTransferRateObserver* observer) { |
| task_queue_.PostTask([this, observer] { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| RTC_DCHECK(observer_ == nullptr); |
| observer_ = observer; |
| observer_->OnStartRateUpdate(*initial_config_.constraints.starting_rate); |
| MaybeCreateControllers(); |
| }); |
| } |
| |
| bool RtpTransportControllerSend::IsRelevantRouteChange( |
| const rtc::NetworkRoute& old_route, |
| const rtc::NetworkRoute& new_route) const { |
| // TODO(bugs.webrtc.org/11438): Experiment with using more information/ |
| // other conditions. |
| bool connected_changed = old_route.connected != new_route.connected; |
| bool route_ids_changed = |
| old_route.local.network_id() != new_route.local.network_id() || |
| old_route.remote.network_id() != new_route.remote.network_id(); |
| if (relay_bandwidth_cap_->IsFinite()) { |
| bool relaying_changed = IsRelayed(old_route) != IsRelayed(new_route); |
| return connected_changed || route_ids_changed || relaying_changed; |
| } else { |
| return connected_changed || route_ids_changed; |
| } |
| } |
| |
| void RtpTransportControllerSend::OnNetworkRouteChanged( |
| const std::string& transport_name, |
| const rtc::NetworkRoute& network_route) { |
| // Check if the network route is connected. |
| |
| if (!network_route.connected) { |
| // TODO(honghaiz): Perhaps handle this in SignalChannelNetworkState and |
| // consider merging these two methods. |
| return; |
| } |
| |
| absl::optional<BitrateConstraints> relay_constraint_update = |
| ApplyOrLiftRelayCap(IsRelayed(network_route)); |
| |
| // 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 || !(kv->second == network_route)) { |
| RTC_LOG(LS_INFO) << "Network route changed on transport " << transport_name |
| << ": new_route = " << network_route.DebugString(); |
| if (!inserted) { |
| RTC_LOG(LS_INFO) << "old_route = " << kv->second.DebugString(); |
| } |
| } |
| |
| if (inserted) { |
| if (relay_constraint_update.has_value()) { |
| UpdateBitrateConstraints(*relay_constraint_update); |
| } |
| task_queue_.PostTask([this, network_route] { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| transport_overhead_bytes_per_packet_ = network_route.packet_overhead; |
| }); |
| // No need to reset BWE if this is the first time the network connects. |
| return; |
| } |
| |
| const rtc::NetworkRoute old_route = kv->second; |
| kv->second = network_route; |
| |
| // Check if enough conditions of the new/old route has changed |
| // to trigger resetting of bitrates (and a probe). |
| if (IsRelevantRouteChange(old_route, network_route)) { |
| BitrateConstraints bitrate_config = bitrate_configurator_.GetConfig(); |
| RTC_LOG(LS_INFO) << "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); |
| |
| if (event_log_) { |
| event_log_->Log(std::make_unique<RtcEventRouteChange>( |
| network_route.connected, network_route.packet_overhead)); |
| } |
| NetworkRouteChange msg; |
| msg.at_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| msg.constraints = ConvertConstraints(bitrate_config, clock_); |
| task_queue_.PostTask([this, msg, network_route] { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| transport_overhead_bytes_per_packet_ = network_route.packet_overhead; |
| if (reset_feedback_on_route_change_) { |
| transport_feedback_adapter_.SetNetworkRoute(network_route); |
| } |
| if (controller_) { |
| PostUpdates(controller_->OnNetworkRouteChange(msg)); |
| } else { |
| UpdateInitialConstraints(msg.constraints); |
| } |
| pacer()->UpdateOutstandingData(DataSize::Zero()); |
| }); |
| } |
| } |
| void RtpTransportControllerSend::OnNetworkAvailability(bool network_available) { |
| RTC_LOG(LS_VERBOSE) << "SignalNetworkState " |
| << (network_available ? "Up" : "Down"); |
| NetworkAvailability msg; |
| msg.at_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| msg.network_available = network_available; |
| task_queue_.PostTask([this, msg]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| if (network_available_ == msg.network_available) |
| return; |
| network_available_ = msg.network_available; |
| if (network_available_) { |
| pacer()->Resume(); |
| } else { |
| pacer()->Pause(); |
| } |
| pacer()->UpdateOutstandingData(DataSize::Zero()); |
| |
| if (controller_) { |
| control_handler_->SetNetworkAvailability(network_available_); |
| PostUpdates(controller_->OnNetworkAvailability(msg)); |
| UpdateControlState(); |
| } else { |
| MaybeCreateControllers(); |
| } |
| }); |
| |
| for (auto& rtp_sender : video_rtp_senders_) { |
| rtp_sender->OnNetworkAvailability(network_available); |
| } |
| } |
| RtcpBandwidthObserver* RtpTransportControllerSend::GetBandwidthObserver() { |
| return this; |
| } |
| int64_t RtpTransportControllerSend::GetPacerQueuingDelayMs() const { |
| return pacer()->OldestPacketWaitTime().ms(); |
| } |
| absl::optional<Timestamp> RtpTransportControllerSend::GetFirstPacketTime() |
| const { |
| return pacer()->FirstSentPacketTime(); |
| } |
| void RtpTransportControllerSend::EnablePeriodicAlrProbing(bool enable) { |
| task_queue_.PostTask([this, enable]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| streams_config_.requests_alr_probing = enable; |
| UpdateStreamsConfig(); |
| }); |
| } |
| void RtpTransportControllerSend::OnSentPacket( |
| const rtc::SentPacket& sent_packet) { |
| task_queue_.PostTask([this, sent_packet]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| absl::optional<SentPacket> packet_msg = |
| transport_feedback_adapter_.ProcessSentPacket(sent_packet); |
| pacer()->UpdateOutstandingData( |
| transport_feedback_adapter_.GetOutstandingData()); |
| if (packet_msg && controller_) |
| PostUpdates(controller_->OnSentPacket(*packet_msg)); |
| }); |
| } |
| |
| void RtpTransportControllerSend::OnReceivedPacket( |
| const ReceivedPacket& packet_msg) { |
| task_queue_.PostTask([this, packet_msg]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| if (controller_) |
| PostUpdates(controller_->OnReceivedPacket(packet_msg)); |
| }); |
| } |
| |
| void RtpTransportControllerSend::UpdateBitrateConstraints( |
| const BitrateConstraints& updated) { |
| TargetRateConstraints msg = ConvertConstraints(updated, clock_); |
| task_queue_.PostTask([this, msg]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| if (controller_) { |
| PostUpdates(controller_->OnTargetRateConstraints(msg)); |
| } else { |
| UpdateInitialConstraints(msg); |
| } |
| }); |
| } |
| |
| void RtpTransportControllerSend::SetSdpBitrateParameters( |
| const BitrateConstraints& constraints) { |
| absl::optional<BitrateConstraints> updated = |
| bitrate_configurator_.UpdateWithSdpParameters(constraints); |
| if (updated.has_value()) { |
| UpdateBitrateConstraints(*updated); |
| } 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()) { |
| UpdateBitrateConstraints(*updated); |
| } else { |
| RTC_LOG(LS_VERBOSE) |
| << "WebRTC.RtpTransportControllerSend.SetClientBitratePreferences: " |
| "nothing to update"; |
| } |
| } |
| |
| absl::optional<BitrateConstraints> |
| RtpTransportControllerSend::ApplyOrLiftRelayCap(bool is_relayed) { |
| DataRate cap = is_relayed ? relay_bandwidth_cap_ : DataRate::PlusInfinity(); |
| return bitrate_configurator_.UpdateWithRelayCap(cap); |
| } |
| |
| void RtpTransportControllerSend::OnTransportOverheadChanged( |
| size_t transport_overhead_bytes_per_packet) { |
| if (transport_overhead_bytes_per_packet >= kMaxOverheadBytes) { |
| RTC_LOG(LS_ERROR) << "Transport overhead exceeds " << kMaxOverheadBytes; |
| return; |
| } |
| |
| pacer()->SetTransportOverhead( |
| DataSize::Bytes(transport_overhead_bytes_per_packet)); |
| |
| // TODO(holmer): Call AudioRtpSenders when they have been moved to |
| // RtpTransportControllerSend. |
| for (auto& rtp_video_sender : video_rtp_senders_) { |
| rtp_video_sender->OnTransportOverheadChanged( |
| transport_overhead_bytes_per_packet); |
| } |
| } |
| |
| void RtpTransportControllerSend::AccountForAudioPacketsInPacedSender( |
| bool account_for_audio) { |
| pacer()->SetAccountForAudioPackets(account_for_audio); |
| } |
| |
| void RtpTransportControllerSend::IncludeOverheadInPacedSender() { |
| pacer()->SetIncludeOverhead(); |
| } |
| |
| void RtpTransportControllerSend::OnReceivedEstimatedBitrate(uint32_t bitrate) { |
| RemoteBitrateReport msg; |
| msg.receive_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| msg.bandwidth = DataRate::BitsPerSec(bitrate); |
| task_queue_.PostTask([this, msg]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| if (controller_) |
| PostUpdates(controller_->OnRemoteBitrateReport(msg)); |
| }); |
| } |
| |
| void RtpTransportControllerSend::OnReceivedRtcpReceiverReport( |
| const ReportBlockList& report_blocks, |
| int64_t rtt_ms, |
| int64_t now_ms) { |
| task_queue_.PostTask([this, report_blocks, now_ms]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| OnReceivedRtcpReceiverReportBlocks(report_blocks, now_ms); |
| }); |
| |
| task_queue_.PostTask([this, now_ms, rtt_ms]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| RoundTripTimeUpdate report; |
| report.receive_time = Timestamp::Millis(now_ms); |
| report.round_trip_time = TimeDelta::Millis(rtt_ms); |
| report.smoothed = false; |
| if (controller_ && !report.round_trip_time.IsZero()) |
| PostUpdates(controller_->OnRoundTripTimeUpdate(report)); |
| }); |
| } |
| |
| void RtpTransportControllerSend::OnAddPacket( |
| const RtpPacketSendInfo& packet_info) { |
| feedback_demuxer_.AddPacket(packet_info); |
| |
| Timestamp creation_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| task_queue_.PostTask([this, packet_info, creation_time]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| transport_feedback_adapter_.AddPacket( |
| packet_info, |
| send_side_bwe_with_overhead_ ? transport_overhead_bytes_per_packet_ : 0, |
| creation_time); |
| }); |
| } |
| |
| void RtpTransportControllerSend::OnTransportFeedback( |
| const rtcp::TransportFeedback& feedback) { |
| feedback_demuxer_.OnTransportFeedback(feedback); |
| auto feedback_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| task_queue_.PostTask([this, feedback, feedback_time]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| absl::optional<TransportPacketsFeedback> feedback_msg = |
| transport_feedback_adapter_.ProcessTransportFeedback(feedback, |
| feedback_time); |
| if (feedback_msg && controller_) { |
| PostUpdates(controller_->OnTransportPacketsFeedback(*feedback_msg)); |
| } |
| pacer()->UpdateOutstandingData( |
| transport_feedback_adapter_.GetOutstandingData()); |
| }); |
| } |
| |
| void RtpTransportControllerSend::OnRemoteNetworkEstimate( |
| NetworkStateEstimate estimate) { |
| if (event_log_) { |
| event_log_->Log(std::make_unique<RtcEventRemoteEstimate>( |
| estimate.link_capacity_lower, estimate.link_capacity_upper)); |
| } |
| estimate.update_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| task_queue_.PostTask([this, estimate] { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| if (controller_) |
| PostUpdates(controller_->OnNetworkStateEstimate(estimate)); |
| }); |
| } |
| |
| void RtpTransportControllerSend::MaybeCreateControllers() { |
| RTC_DCHECK(!controller_); |
| RTC_DCHECK(!control_handler_); |
| |
| if (!network_available_ || !observer_) |
| return; |
| control_handler_ = std::make_unique<CongestionControlHandler>(); |
| |
| initial_config_.constraints.at_time = |
| Timestamp::Millis(clock_->TimeInMilliseconds()); |
| initial_config_.stream_based_config = streams_config_; |
| |
| // TODO(srte): Use fallback controller if no feedback is available. |
| if (controller_factory_override_) { |
| RTC_LOG(LS_INFO) << "Creating overridden congestion controller"; |
| controller_ = controller_factory_override_->Create(initial_config_); |
| process_interval_ = controller_factory_override_->GetProcessInterval(); |
| } else { |
| RTC_LOG(LS_INFO) << "Creating fallback congestion controller"; |
| controller_ = controller_factory_fallback_->Create(initial_config_); |
| process_interval_ = controller_factory_fallback_->GetProcessInterval(); |
| } |
| UpdateControllerWithTimeInterval(); |
| StartProcessPeriodicTasks(); |
| } |
| |
| void RtpTransportControllerSend::UpdateInitialConstraints( |
| TargetRateConstraints new_contraints) { |
| if (!new_contraints.starting_rate) |
| new_contraints.starting_rate = initial_config_.constraints.starting_rate; |
| RTC_DCHECK(new_contraints.starting_rate); |
| initial_config_.constraints = new_contraints; |
| } |
| |
| void RtpTransportControllerSend::StartProcessPeriodicTasks() { |
| if (!pacer_queue_update_task_.Running()) { |
| pacer_queue_update_task_ = RepeatingTaskHandle::DelayedStart( |
| task_queue_.Get(), kPacerQueueUpdateInterval, [this]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| TimeDelta expected_queue_time = pacer()->ExpectedQueueTime(); |
| control_handler_->SetPacerQueue(expected_queue_time); |
| UpdateControlState(); |
| return kPacerQueueUpdateInterval; |
| }); |
| } |
| controller_task_.Stop(); |
| if (process_interval_.IsFinite()) { |
| controller_task_ = RepeatingTaskHandle::DelayedStart( |
| task_queue_.Get(), process_interval_, [this]() { |
| RTC_DCHECK_RUN_ON(&task_queue_); |
| UpdateControllerWithTimeInterval(); |
| return process_interval_; |
| }); |
| } |
| } |
| |
| void RtpTransportControllerSend::UpdateControllerWithTimeInterval() { |
| RTC_DCHECK(controller_); |
| ProcessInterval msg; |
| msg.at_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| if (add_pacing_to_cwin_) |
| msg.pacer_queue = pacer()->QueueSizeData(); |
| PostUpdates(controller_->OnProcessInterval(msg)); |
| } |
| |
| void RtpTransportControllerSend::UpdateStreamsConfig() { |
| streams_config_.at_time = Timestamp::Millis(clock_->TimeInMilliseconds()); |
| if (controller_) |
| PostUpdates(controller_->OnStreamsConfig(streams_config_)); |
| } |
| |
| void RtpTransportControllerSend::PostUpdates(NetworkControlUpdate update) { |
| if (update.congestion_window) { |
| pacer()->SetCongestionWindow(*update.congestion_window); |
| } |
| if (update.pacer_config) { |
| pacer()->SetPacingRates(update.pacer_config->data_rate(), |
| update.pacer_config->pad_rate()); |
| } |
| for (const auto& probe : update.probe_cluster_configs) { |
| pacer()->CreateProbeCluster(probe.target_data_rate, probe.id); |
| } |
| if (update.target_rate) { |
| control_handler_->SetTargetRate(*update.target_rate); |
| UpdateControlState(); |
| } |
| } |
| |
| void RtpTransportControllerSend::OnReceivedRtcpReceiverReportBlocks( |
| const ReportBlockList& report_blocks, |
| int64_t now_ms) { |
| if (report_blocks.empty()) |
| return; |
| |
| int total_packets_lost_delta = 0; |
| int total_packets_delta = 0; |
| |
| // Compute the packet loss from all report blocks. |
| for (const RTCPReportBlock& report_block : report_blocks) { |
| auto it = last_report_blocks_.find(report_block.source_ssrc); |
| if (it != last_report_blocks_.end()) { |
| auto number_of_packets = report_block.extended_highest_sequence_number - |
| it->second.extended_highest_sequence_number; |
| total_packets_delta += number_of_packets; |
| auto lost_delta = report_block.packets_lost - it->second.packets_lost; |
| total_packets_lost_delta += lost_delta; |
| } |
| last_report_blocks_[report_block.source_ssrc] = report_block; |
| } |
| // Can only compute delta if there has been previous blocks to compare to. If |
| // not, total_packets_delta will be unchanged and there's nothing more to do. |
| if (!total_packets_delta) |
| return; |
| int packets_received_delta = total_packets_delta - total_packets_lost_delta; |
| // To detect lost packets, at least one packet has to be received. This check |
| // is needed to avoid bandwith detection update in |
| // VideoSendStreamTest.SuspendBelowMinBitrate |
| |
| if (packets_received_delta < 1) |
| return; |
| Timestamp now = Timestamp::Millis(now_ms); |
| TransportLossReport msg; |
| msg.packets_lost_delta = total_packets_lost_delta; |
| msg.packets_received_delta = packets_received_delta; |
| msg.receive_time = now; |
| msg.start_time = last_report_block_time_; |
| msg.end_time = now; |
| if (controller_) |
| PostUpdates(controller_->OnTransportLossReport(msg)); |
| last_report_block_time_ = now; |
| } |
| |
| } // namespace webrtc |
