| /* |
| * Copyright (c) 2015 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_video_sender.h" |
| |
| #include <algorithm> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| |
| #include "absl/algorithm/container.h" |
| #include "absl/strings/match.h" |
| #include "absl/strings/string_view.h" |
| #include "api/array_view.h" |
| #include "api/task_queue/task_queue_factory.h" |
| #include "api/transport/field_trial_based_config.h" |
| #include "api/units/time_delta.h" |
| #include "api/video_codecs/video_codec.h" |
| #include "call/rtp_transport_controller_send_interface.h" |
| #include "modules/pacing/packet_router.h" |
| #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h" |
| #include "modules/rtp_rtcp/source/rtp_rtcp_impl2.h" |
| #include "modules/rtp_rtcp/source/rtp_sender.h" |
| #include "modules/video_coding/include/video_codec_interface.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/trace_event.h" |
| |
| namespace webrtc { |
| |
| namespace webrtc_internal_rtp_video_sender { |
| |
| RtpStreamSender::RtpStreamSender( |
| std::unique_ptr<ModuleRtpRtcpImpl2> rtp_rtcp, |
| std::unique_ptr<RTPSenderVideo> sender_video, |
| std::unique_ptr<VideoFecGenerator> fec_generator) |
| : rtp_rtcp(std::move(rtp_rtcp)), |
| sender_video(std::move(sender_video)), |
| fec_generator(std::move(fec_generator)) {} |
| |
| RtpStreamSender::~RtpStreamSender() = default; |
| |
| } // namespace webrtc_internal_rtp_video_sender |
| |
| namespace { |
| static const int kMinSendSidePacketHistorySize = 600; |
| // We don't do MTU discovery, so assume that we have the standard ethernet MTU. |
| static const size_t kPathMTU = 1500; |
| |
| using webrtc_internal_rtp_video_sender::RtpStreamSender; |
| |
| bool PayloadTypeSupportsSkippingFecPackets(absl::string_view payload_name, |
| const FieldTrialsView& trials) { |
| const VideoCodecType codecType = |
| PayloadStringToCodecType(std::string(payload_name)); |
| if (codecType == kVideoCodecVP8 || codecType == kVideoCodecVP9) { |
| return true; |
| } |
| if (codecType == kVideoCodecGeneric && |
| absl::StartsWith(trials.Lookup("WebRTC-GenericPictureId"), "Enabled")) { |
| return true; |
| } |
| return false; |
| } |
| |
| bool ShouldDisableRedAndUlpfec(bool flexfec_enabled, |
| const RtpConfig& rtp_config, |
| const FieldTrialsView& trials) { |
| // Consistency of NACK and RED+ULPFEC parameters is checked in this function. |
| const bool nack_enabled = rtp_config.nack.rtp_history_ms > 0; |
| |
| // Shorthands. |
| auto IsRedEnabled = [&]() { return rtp_config.ulpfec.red_payload_type >= 0; }; |
| auto IsUlpfecEnabled = [&]() { |
| return rtp_config.ulpfec.ulpfec_payload_type >= 0; |
| }; |
| |
| bool should_disable_red_and_ulpfec = false; |
| |
| if (absl::StartsWith(trials.Lookup("WebRTC-DisableUlpFecExperiment"), |
| "Enabled")) { |
| RTC_LOG(LS_INFO) << "Experiment to disable sending ULPFEC is enabled."; |
| should_disable_red_and_ulpfec = true; |
| } |
| |
| // If enabled, FlexFEC takes priority over RED+ULPFEC. |
| if (flexfec_enabled) { |
| if (IsUlpfecEnabled()) { |
| RTC_LOG(LS_INFO) |
| << "Both FlexFEC and ULPFEC are configured. Disabling ULPFEC."; |
| } |
| should_disable_red_and_ulpfec = true; |
| } |
| |
| // Payload types without picture ID cannot determine that a stream is complete |
| // without retransmitting FEC, so using ULPFEC + NACK for H.264 (for instance) |
| // is a waste of bandwidth since FEC packets still have to be transmitted. |
| // Note that this is not the case with FlexFEC. |
| if (nack_enabled && IsUlpfecEnabled() && |
| !PayloadTypeSupportsSkippingFecPackets(rtp_config.payload_name, trials)) { |
| RTC_LOG(LS_WARNING) |
| << "Transmitting payload type without picture ID using " |
| "NACK+ULPFEC is a waste of bandwidth since ULPFEC packets " |
| "also have to be retransmitted. Disabling ULPFEC."; |
| should_disable_red_and_ulpfec = true; |
| } |
| |
| // Verify payload types. |
| if (IsUlpfecEnabled() ^ IsRedEnabled()) { |
| RTC_LOG(LS_WARNING) |
| << "Only RED or only ULPFEC enabled, but not both. Disabling both."; |
| should_disable_red_and_ulpfec = true; |
| } |
| |
| return should_disable_red_and_ulpfec; |
| } |
| |
| // TODO(brandtr): Update this function when we support multistream protection. |
| std::unique_ptr<VideoFecGenerator> MaybeCreateFecGenerator( |
| Clock* clock, |
| const RtpConfig& rtp, |
| const std::map<uint32_t, RtpState>& suspended_ssrcs, |
| int simulcast_index, |
| const FieldTrialsView& trials) { |
| // If flexfec is configured that takes priority. |
| if (rtp.flexfec.payload_type >= 0) { |
| RTC_DCHECK_GE(rtp.flexfec.payload_type, 0); |
| RTC_DCHECK_LE(rtp.flexfec.payload_type, 127); |
| if (rtp.flexfec.ssrc == 0) { |
| RTC_LOG(LS_WARNING) << "FlexFEC is enabled, but no FlexFEC SSRC given. " |
| "Therefore disabling FlexFEC."; |
| return nullptr; |
| } |
| if (rtp.flexfec.protected_media_ssrcs.empty()) { |
| RTC_LOG(LS_WARNING) |
| << "FlexFEC is enabled, but no protected media SSRC given. " |
| "Therefore disabling FlexFEC."; |
| return nullptr; |
| } |
| |
| if (rtp.flexfec.protected_media_ssrcs.size() > 1) { |
| RTC_LOG(LS_WARNING) |
| << "The supplied FlexfecConfig contained multiple protected " |
| "media streams, but our implementation currently only " |
| "supports protecting a single media stream. " |
| "To avoid confusion, disabling FlexFEC completely."; |
| return nullptr; |
| } |
| |
| if (absl::c_find(rtp.flexfec.protected_media_ssrcs, |
| rtp.ssrcs[simulcast_index]) == |
| rtp.flexfec.protected_media_ssrcs.end()) { |
| // Media SSRC not among flexfec protected SSRCs. |
| return nullptr; |
| } |
| |
| const RtpState* rtp_state = nullptr; |
| auto it = suspended_ssrcs.find(rtp.flexfec.ssrc); |
| if (it != suspended_ssrcs.end()) { |
| rtp_state = &it->second; |
| } |
| |
| RTC_DCHECK_EQ(1U, rtp.flexfec.protected_media_ssrcs.size()); |
| return std::make_unique<FlexfecSender>( |
| rtp.flexfec.payload_type, rtp.flexfec.ssrc, |
| rtp.flexfec.protected_media_ssrcs[0], rtp.mid, rtp.extensions, |
| RTPSender::FecExtensionSizes(), rtp_state, clock); |
| } else if (rtp.ulpfec.red_payload_type >= 0 && |
| rtp.ulpfec.ulpfec_payload_type >= 0 && |
| !ShouldDisableRedAndUlpfec(/*flexfec_enabled=*/false, rtp, |
| trials)) { |
| // Flexfec not configured, but ulpfec is and is not disabled. |
| return std::make_unique<UlpfecGenerator>( |
| rtp.ulpfec.red_payload_type, rtp.ulpfec.ulpfec_payload_type, clock); |
| } |
| |
| // Not a single FEC is given. |
| return nullptr; |
| } |
| |
| std::vector<RtpStreamSender> CreateRtpStreamSenders( |
| Clock* clock, |
| const RtpConfig& rtp_config, |
| const RtpSenderObservers& observers, |
| int rtcp_report_interval_ms, |
| Transport* send_transport, |
| RtpTransportControllerSendInterface* transport, |
| const std::map<uint32_t, RtpState>& suspended_ssrcs, |
| RtcEventLog* event_log, |
| RateLimiter* retransmission_rate_limiter, |
| FrameEncryptorInterface* frame_encryptor, |
| const CryptoOptions& crypto_options, |
| rtc::scoped_refptr<FrameTransformerInterface> frame_transformer, |
| const FieldTrialsView& trials, |
| TaskQueueFactory* task_queue_factory) { |
| RTC_DCHECK_GT(rtp_config.ssrcs.size(), 0); |
| RTC_DCHECK(task_queue_factory); |
| |
| RtpRtcpInterface::Configuration configuration; |
| configuration.clock = clock; |
| configuration.audio = false; |
| configuration.receiver_only = false; |
| configuration.outgoing_transport = send_transport; |
| configuration.intra_frame_callback = observers.intra_frame_callback; |
| configuration.rtcp_loss_notification_observer = |
| observers.rtcp_loss_notification_observer; |
| configuration.network_link_rtcp_observer = transport->GetRtcpObserver(); |
| configuration.network_state_estimate_observer = |
| transport->network_state_estimate_observer(); |
| configuration.rtt_stats = observers.rtcp_rtt_stats; |
| configuration.rtcp_packet_type_counter_observer = |
| observers.rtcp_type_observer; |
| configuration.report_block_data_observer = |
| observers.report_block_data_observer; |
| configuration.paced_sender = transport->packet_sender(); |
| configuration.send_bitrate_observer = observers.bitrate_observer; |
| configuration.send_packet_observer = observers.send_packet_observer; |
| configuration.event_log = event_log; |
| if (trials.IsDisabled("WebRTC-DisableRtxRateLimiter")) { |
| configuration.retransmission_rate_limiter = retransmission_rate_limiter; |
| } |
| configuration.rtp_stats_callback = observers.rtp_stats; |
| configuration.frame_encryptor = frame_encryptor; |
| configuration.require_frame_encryption = |
| crypto_options.sframe.require_frame_encryption; |
| configuration.extmap_allow_mixed = rtp_config.extmap_allow_mixed; |
| configuration.rtcp_report_interval_ms = rtcp_report_interval_ms; |
| configuration.field_trials = &trials; |
| configuration.enable_send_packet_batching = |
| rtp_config.enable_send_packet_batching; |
| |
| std::vector<RtpStreamSender> rtp_streams; |
| |
| RTC_DCHECK(rtp_config.rtx.ssrcs.empty() || |
| rtp_config.rtx.ssrcs.size() == rtp_config.ssrcs.size()); |
| |
| // Some streams could have been disabled, but the rids are still there. |
| // This will occur when simulcast has been disabled for a codec (e.g. VP9) |
| RTC_DCHECK(rtp_config.rids.empty() || |
| rtp_config.rids.size() >= rtp_config.ssrcs.size()); |
| |
| for (size_t i = 0; i < rtp_config.ssrcs.size(); ++i) { |
| RTPSenderVideo::Config video_config; |
| configuration.local_media_ssrc = rtp_config.ssrcs[i]; |
| |
| std::unique_ptr<VideoFecGenerator> fec_generator = |
| MaybeCreateFecGenerator(clock, rtp_config, suspended_ssrcs, i, trials); |
| configuration.fec_generator = fec_generator.get(); |
| |
| configuration.rtx_send_ssrc = |
| rtp_config.GetRtxSsrcAssociatedWithMediaSsrc(rtp_config.ssrcs[i]); |
| RTC_DCHECK_EQ(configuration.rtx_send_ssrc.has_value(), |
| !rtp_config.rtx.ssrcs.empty()); |
| |
| configuration.rid = (i < rtp_config.rids.size()) ? rtp_config.rids[i] : ""; |
| |
| configuration.need_rtp_packet_infos = rtp_config.lntf.enabled; |
| |
| std::unique_ptr<ModuleRtpRtcpImpl2> rtp_rtcp( |
| ModuleRtpRtcpImpl2::Create(configuration)); |
| rtp_rtcp->SetSendingStatus(false); |
| rtp_rtcp->SetSendingMediaStatus(false); |
| rtp_rtcp->SetRTCPStatus(RtcpMode::kCompound); |
| // Set NACK. |
| rtp_rtcp->SetStorePacketsStatus(true, kMinSendSidePacketHistorySize); |
| |
| video_config.clock = configuration.clock; |
| video_config.rtp_sender = rtp_rtcp->RtpSender(); |
| video_config.frame_encryptor = frame_encryptor; |
| video_config.require_frame_encryption = |
| crypto_options.sframe.require_frame_encryption; |
| video_config.field_trials = &trials; |
| video_config.enable_retransmit_all_layers = |
| !video_config.field_trials->IsDisabled( |
| "WebRTC-Video-EnableRetransmitAllLayers"); |
| |
| const bool using_flexfec = |
| fec_generator && |
| fec_generator->GetFecType() == VideoFecGenerator::FecType::kFlexFec; |
| const bool should_disable_red_and_ulpfec = |
| ShouldDisableRedAndUlpfec(using_flexfec, rtp_config, trials); |
| if (!should_disable_red_and_ulpfec && |
| rtp_config.ulpfec.red_payload_type != -1) { |
| video_config.red_payload_type = rtp_config.ulpfec.red_payload_type; |
| } |
| if (fec_generator) { |
| video_config.fec_type = fec_generator->GetFecType(); |
| video_config.fec_overhead_bytes = fec_generator->MaxPacketOverhead(); |
| } |
| video_config.frame_transformer = frame_transformer; |
| video_config.task_queue_factory = task_queue_factory; |
| auto sender_video = std::make_unique<RTPSenderVideo>(video_config); |
| rtp_streams.emplace_back(std::move(rtp_rtcp), std::move(sender_video), |
| std::move(fec_generator)); |
| } |
| return rtp_streams; |
| } |
| |
| absl::optional<VideoCodecType> GetVideoCodecType(const RtpConfig& config) { |
| if (config.raw_payload) { |
| return absl::nullopt; |
| } |
| return PayloadStringToCodecType(config.payload_name); |
| } |
| bool TransportSeqNumExtensionConfigured(const RtpConfig& config) { |
| return absl::c_any_of(config.extensions, [](const RtpExtension& ext) { |
| return ext.uri == RtpExtension::kTransportSequenceNumberUri; |
| }); |
| } |
| |
| // Returns true when some coded video sequence can be decoded starting with |
| // this frame without requiring any previous frames. |
| // e.g. it is the same as a key frame when spatial scalability is not used. |
| // When spatial scalability is used, then it is true for layer frames of |
| // a key frame without inter-layer dependencies. |
| bool IsFirstFrameOfACodedVideoSequence( |
| const EncodedImage& encoded_image, |
| const CodecSpecificInfo* codec_specific_info) { |
| if (encoded_image._frameType != VideoFrameType::kVideoFrameKey) { |
| return false; |
| } |
| |
| if (codec_specific_info != nullptr) { |
| if (codec_specific_info->generic_frame_info.has_value()) { |
| // This function is used before |
| // `codec_specific_info->generic_frame_info->frame_diffs` are calculated, |
| // so need to use a more complicated way to check for presence of the |
| // dependencies. |
| return absl::c_none_of( |
| codec_specific_info->generic_frame_info->encoder_buffers, |
| [](const CodecBufferUsage& buffer) { return buffer.referenced; }); |
| } |
| |
| if (codec_specific_info->codecType == VideoCodecType::kVideoCodecVP8 || |
| codec_specific_info->codecType == VideoCodecType::kVideoCodecH264 || |
| codec_specific_info->codecType == VideoCodecType::kVideoCodecGeneric) { |
| // These codecs do not support intra picture dependencies, so a frame |
| // marked as a key frame should be a key frame. |
| return true; |
| } |
| } |
| |
| // Without depenedencies described in generic format do an educated guess. |
| // It might be wrong for VP9 with spatial layer 0 skipped or higher spatial |
| // layer not depending on the spatial layer 0. This corner case is unimportant |
| // for current usage of this helper function. |
| |
| // Use <= to accept both 0 (i.e. the first) and nullopt (i.e. the only). |
| return encoded_image.SpatialIndex() <= 0; |
| } |
| |
| } // namespace |
| |
| RtpVideoSender::RtpVideoSender( |
| Clock* clock, |
| const 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, |
| RtpTransportControllerSendInterface* transport, |
| RtcEventLog* event_log, |
| RateLimiter* retransmission_limiter, |
| std::unique_ptr<FecController> fec_controller, |
| FrameEncryptorInterface* frame_encryptor, |
| const CryptoOptions& crypto_options, |
| rtc::scoped_refptr<FrameTransformerInterface> frame_transformer, |
| const FieldTrialsView& field_trials, |
| TaskQueueFactory* task_queue_factory) |
| : field_trials_(field_trials), |
| use_frame_rate_for_overhead_(absl::StartsWith( |
| field_trials_.Lookup("WebRTC-Video-UseFrameRateForOverhead"), |
| "Enabled")), |
| has_packet_feedback_(TransportSeqNumExtensionConfigured(rtp_config)), |
| active_(false), |
| fec_controller_(std::move(fec_controller)), |
| fec_allowed_(true), |
| rtp_streams_(CreateRtpStreamSenders(clock, |
| rtp_config, |
| observers, |
| rtcp_report_interval_ms, |
| send_transport, |
| transport, |
| suspended_ssrcs, |
| event_log, |
| retransmission_limiter, |
| frame_encryptor, |
| crypto_options, |
| std::move(frame_transformer), |
| field_trials_, |
| task_queue_factory)), |
| rtp_config_(rtp_config), |
| codec_type_(GetVideoCodecType(rtp_config)), |
| transport_(transport), |
| independent_frame_ids_( |
| field_trials_.IsEnabled( |
| "WebRTC-Video-SimulcastIndependentFrameIds") && |
| field_trials_.IsDisabled("WebRTC-GenericDescriptorAuth")), |
| transport_overhead_bytes_per_packet_(0), |
| encoder_target_rate_bps_(0), |
| frame_counts_(rtp_config.ssrcs.size()), |
| frame_count_observer_(observers.frame_count_observer) { |
| transport_checker_.Detach(); |
| RTC_DCHECK_EQ(rtp_config_.ssrcs.size(), rtp_streams_.size()); |
| if (has_packet_feedback_) |
| transport_->IncludeOverheadInPacedSender(); |
| // SSRCs are assumed to be sorted in the same order as `rtp_modules`. |
| for (uint32_t ssrc : rtp_config_.ssrcs) { |
| // Restore state if it previously existed. |
| const RtpPayloadState* state = nullptr; |
| auto it = states.find(ssrc); |
| if (it != states.end()) { |
| state = &it->second; |
| shared_frame_id_ = std::max(shared_frame_id_, state->shared_frame_id); |
| } |
| params_.push_back(RtpPayloadParams(ssrc, state, field_trials_)); |
| } |
| |
| // RTP/RTCP initialization. |
| |
| for (size_t i = 0; i < rtp_config_.extensions.size(); ++i) { |
| const std::string& extension = rtp_config_.extensions[i].uri; |
| int id = rtp_config_.extensions[i].id; |
| RTC_DCHECK(RtpExtension::IsSupportedForVideo(extension)); |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->RegisterRtpHeaderExtension(extension, id); |
| } |
| } |
| |
| ConfigureSsrcs(suspended_ssrcs); |
| |
| if (!rtp_config_.mid.empty()) { |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->SetMid(rtp_config_.mid); |
| } |
| } |
| |
| bool fec_enabled = false; |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| // Simulcast has one module for each layer. Set the CNAME on all modules. |
| stream.rtp_rtcp->SetCNAME(rtp_config_.c_name.c_str()); |
| stream.rtp_rtcp->SetMaxRtpPacketSize(rtp_config_.max_packet_size); |
| stream.rtp_rtcp->RegisterSendPayloadFrequency(rtp_config_.payload_type, |
| kVideoPayloadTypeFrequency); |
| if (stream.fec_generator != nullptr) { |
| fec_enabled = true; |
| } |
| } |
| // Currently, both ULPFEC and FlexFEC use the same FEC rate calculation logic, |
| // so enable that logic if either of those FEC schemes are enabled. |
| fec_controller_->SetProtectionMethod(fec_enabled, NackEnabled()); |
| |
| fec_controller_->SetProtectionCallback(this); |
| |
| // Construction happens on the worker thread (see Call::CreateVideoSendStream) |
| // but subseqeuent calls to the RTP state will happen on one of two threads: |
| // * The pacer thread for actually sending packets. |
| // * The transport thread when tearing down and quering GetRtpState(). |
| // Detach thread checkers. |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->OnPacketSendingThreadSwitched(); |
| } |
| } |
| |
| RtpVideoSender::~RtpVideoSender() { |
| RTC_DCHECK_RUN_ON(&transport_checker_); |
| SetActiveModulesLocked( |
| /*sending=*/false); |
| } |
| |
| void RtpVideoSender::SetSending(bool enabled) { |
| RTC_DCHECK_RUN_ON(&transport_checker_); |
| MutexLock lock(&mutex_); |
| if (enabled == active_) { |
| return; |
| } |
| SetActiveModulesLocked(/*sending=*/enabled); |
| } |
| |
| void RtpVideoSender::SetActiveModulesLocked(bool sending) { |
| RTC_DCHECK_RUN_ON(&transport_checker_); |
| if (active_ == sending) { |
| return; |
| } |
| active_ = sending; |
| for (size_t i = 0; i < rtp_streams_.size(); ++i) { |
| RtpRtcpInterface& rtp_module = *rtp_streams_[i].rtp_rtcp; |
| rtp_module.SetSendingStatus(sending); |
| rtp_module.SetSendingMediaStatus(sending); |
| if (sending) { |
| transport_->RegisterSendingRtpStream(rtp_module); |
| } else { |
| transport_->DeRegisterSendingRtpStream(rtp_module); |
| } |
| } |
| auto* feedback_provider = transport_->GetStreamFeedbackProvider(); |
| if (!sending) { |
| feedback_provider->DeRegisterStreamFeedbackObserver(this); |
| } else { |
| feedback_provider->RegisterStreamFeedbackObserver(rtp_config_.ssrcs, this); |
| } |
| } |
| |
| bool RtpVideoSender::IsActive() { |
| RTC_DCHECK_RUN_ON(&transport_checker_); |
| MutexLock lock(&mutex_); |
| return IsActiveLocked(); |
| } |
| |
| bool RtpVideoSender::IsActiveLocked() { |
| return active_ && !rtp_streams_.empty(); |
| } |
| |
| EncodedImageCallback::Result RtpVideoSender::OnEncodedImage( |
| const EncodedImage& encoded_image, |
| const CodecSpecificInfo* codec_specific_info) { |
| fec_controller_->UpdateWithEncodedData(encoded_image.size(), |
| encoded_image._frameType); |
| MutexLock lock(&mutex_); |
| RTC_DCHECK(!rtp_streams_.empty()); |
| if (!active_) |
| return Result(Result::ERROR_SEND_FAILED); |
| |
| shared_frame_id_++; |
| size_t simulcast_index = encoded_image.SimulcastIndex().value_or(0); |
| RTC_DCHECK_LT(simulcast_index, rtp_streams_.size()); |
| |
| uint32_t rtp_timestamp = |
| encoded_image.RtpTimestamp() + |
| rtp_streams_[simulcast_index].rtp_rtcp->StartTimestamp(); |
| |
| // RTCPSender has it's own copy of the timestamp offset, added in |
| // RTCPSender::BuildSR, hence we must not add the in the offset for this call. |
| // TODO(nisse): Delete RTCPSender:timestamp_offset_, and see if we can confine |
| // knowledge of the offset to a single place. |
| if (!rtp_streams_[simulcast_index].rtp_rtcp->OnSendingRtpFrame( |
| encoded_image.RtpTimestamp(), encoded_image.capture_time_ms_, |
| rtp_config_.payload_type, |
| encoded_image._frameType == VideoFrameType::kVideoFrameKey)) { |
| // The payload router could be active but this module isn't sending. |
| return Result(Result::ERROR_SEND_FAILED); |
| } |
| |
| TimeDelta expected_retransmission_time = TimeDelta::PlusInfinity(); |
| if (encoded_image.RetransmissionAllowed()) { |
| expected_retransmission_time = |
| rtp_streams_[simulcast_index].rtp_rtcp->ExpectedRetransmissionTime(); |
| } |
| |
| if (IsFirstFrameOfACodedVideoSequence(encoded_image, codec_specific_info)) { |
| // In order to use the dependency descriptor RTP header extension: |
| // - Pass along any `FrameDependencyStructure` templates produced by the |
| // encoder adapter. |
| // - If none were produced the `RtpPayloadParams::*ToGeneric` for the |
| // particular codec have simulated a dependency structure, so provide a |
| // minimal set of templates. |
| // - Otherwise, don't pass along any templates at all which will disable |
| // the generation of a dependency descriptor. |
| RTPSenderVideo& sender_video = *rtp_streams_[simulcast_index].sender_video; |
| if (codec_specific_info && codec_specific_info->template_structure) { |
| sender_video.SetVideoStructure(&*codec_specific_info->template_structure); |
| } else if (absl::optional<FrameDependencyStructure> structure = |
| params_[simulcast_index].GenericStructure( |
| codec_specific_info)) { |
| sender_video.SetVideoStructure(&*structure); |
| } else { |
| sender_video.SetVideoStructure(nullptr); |
| } |
| } |
| |
| absl::optional<int64_t> frame_id; |
| if (!independent_frame_ids_) { |
| frame_id = shared_frame_id_; |
| } |
| |
| bool send_result = |
| rtp_streams_[simulcast_index].sender_video->SendEncodedImage( |
| rtp_config_.payload_type, codec_type_, rtp_timestamp, encoded_image, |
| params_[simulcast_index].GetRtpVideoHeader( |
| encoded_image, codec_specific_info, frame_id), |
| expected_retransmission_time); |
| if (frame_count_observer_) { |
| FrameCounts& counts = frame_counts_[simulcast_index]; |
| if (encoded_image._frameType == VideoFrameType::kVideoFrameKey) { |
| ++counts.key_frames; |
| } else if (encoded_image._frameType == VideoFrameType::kVideoFrameDelta) { |
| ++counts.delta_frames; |
| } else { |
| RTC_DCHECK(encoded_image._frameType == VideoFrameType::kEmptyFrame); |
| } |
| frame_count_observer_->FrameCountUpdated( |
| counts, rtp_config_.ssrcs[simulcast_index]); |
| } |
| if (!send_result) |
| return Result(Result::ERROR_SEND_FAILED); |
| |
| return Result(Result::OK, rtp_timestamp); |
| } |
| |
| void RtpVideoSender::OnBitrateAllocationUpdated( |
| const VideoBitrateAllocation& bitrate) { |
| RTC_DCHECK_RUN_ON(&transport_checker_); |
| MutexLock lock(&mutex_); |
| if (IsActiveLocked()) { |
| if (rtp_streams_.size() == 1) { |
| // If spatial scalability is enabled, it is covered by a single stream. |
| rtp_streams_[0].rtp_rtcp->SetVideoBitrateAllocation(bitrate); |
| } else { |
| std::vector<absl::optional<VideoBitrateAllocation>> layer_bitrates = |
| bitrate.GetSimulcastAllocations(); |
| // Simulcast is in use, split the VideoBitrateAllocation into one struct |
| // per rtp stream, moving over the temporal layer allocation. |
| for (size_t i = 0; i < rtp_streams_.size(); ++i) { |
| // The next spatial layer could be used if the current one is |
| // inactive. |
| if (layer_bitrates[i]) { |
| rtp_streams_[i].rtp_rtcp->SetVideoBitrateAllocation( |
| *layer_bitrates[i]); |
| } else { |
| // Signal a 0 bitrate on a simulcast stream. |
| rtp_streams_[i].rtp_rtcp->SetVideoBitrateAllocation( |
| VideoBitrateAllocation()); |
| } |
| } |
| } |
| } |
| } |
| void RtpVideoSender::OnVideoLayersAllocationUpdated( |
| const VideoLayersAllocation& allocation) { |
| MutexLock lock(&mutex_); |
| if (IsActiveLocked()) { |
| for (size_t i = 0; i < rtp_streams_.size(); ++i) { |
| VideoLayersAllocation stream_allocation = allocation; |
| stream_allocation.rtp_stream_index = i; |
| rtp_streams_[i].sender_video->SetVideoLayersAllocation( |
| std::move(stream_allocation)); |
| // Only send video frames on the rtp module if the encoder is configured |
| // to send. This is to prevent stray frames to be sent after an encoder |
| // has been reconfigured. |
| rtp_streams_[i].rtp_rtcp->SetSendingMediaStatus( |
| absl::c_any_of(allocation.active_spatial_layers, |
| [&i](const VideoLayersAllocation::SpatialLayer layer) { |
| return layer.rtp_stream_index == static_cast<int>(i); |
| })); |
| } |
| } |
| } |
| |
| bool RtpVideoSender::NackEnabled() const { |
| const bool nack_enabled = rtp_config_.nack.rtp_history_ms > 0; |
| return nack_enabled; |
| } |
| |
| DataRate RtpVideoSender::GetPostEncodeOverhead() const { |
| DataRate post_encode_overhead = DataRate::Zero(); |
| for (size_t i = 0; i < rtp_streams_.size(); ++i) { |
| if (rtp_streams_[i].rtp_rtcp->SendingMedia()) { |
| post_encode_overhead += |
| rtp_streams_[i].sender_video->PostEncodeOverhead(); |
| } |
| } |
| return post_encode_overhead; |
| } |
| |
| void RtpVideoSender::DeliverRtcp(const uint8_t* packet, size_t length) { |
| // Runs on a network thread. |
| for (const RtpStreamSender& stream : rtp_streams_) |
| stream.rtp_rtcp->IncomingRtcpPacket(rtc::MakeArrayView(packet, length)); |
| } |
| |
| void RtpVideoSender::ConfigureSsrcs( |
| const std::map<uint32_t, RtpState>& suspended_ssrcs) { |
| // Configure regular SSRCs. |
| RTC_CHECK(ssrc_to_rtp_module_.empty()); |
| for (size_t i = 0; i < rtp_config_.ssrcs.size(); ++i) { |
| uint32_t ssrc = rtp_config_.ssrcs[i]; |
| RtpRtcpInterface* const rtp_rtcp = rtp_streams_[i].rtp_rtcp.get(); |
| |
| // Restore RTP state if previous existed. |
| auto it = suspended_ssrcs.find(ssrc); |
| if (it != suspended_ssrcs.end()) |
| rtp_rtcp->SetRtpState(it->second); |
| |
| ssrc_to_rtp_module_[ssrc] = rtp_rtcp; |
| } |
| |
| // Set up RTX if available. |
| if (rtp_config_.rtx.ssrcs.empty()) |
| return; |
| |
| RTC_DCHECK_EQ(rtp_config_.rtx.ssrcs.size(), rtp_config_.ssrcs.size()); |
| for (size_t i = 0; i < rtp_config_.rtx.ssrcs.size(); ++i) { |
| uint32_t ssrc = rtp_config_.rtx.ssrcs[i]; |
| RtpRtcpInterface* const rtp_rtcp = rtp_streams_[i].rtp_rtcp.get(); |
| auto it = suspended_ssrcs.find(ssrc); |
| if (it != suspended_ssrcs.end()) |
| rtp_rtcp->SetRtxState(it->second); |
| } |
| |
| // Configure RTX payload types. |
| RTC_DCHECK_GE(rtp_config_.rtx.payload_type, 0); |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->SetRtxSendPayloadType(rtp_config_.rtx.payload_type, |
| rtp_config_.payload_type); |
| stream.rtp_rtcp->SetRtxSendStatus(kRtxRetransmitted | |
| kRtxRedundantPayloads); |
| } |
| if (rtp_config_.ulpfec.red_payload_type != -1 && |
| rtp_config_.ulpfec.red_rtx_payload_type != -1) { |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->SetRtxSendPayloadType( |
| rtp_config_.ulpfec.red_rtx_payload_type, |
| rtp_config_.ulpfec.red_payload_type); |
| } |
| } |
| } |
| |
| void RtpVideoSender::OnNetworkAvailability(bool network_available) { |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->SetRTCPStatus(network_available ? rtp_config_.rtcp_mode |
| : RtcpMode::kOff); |
| } |
| } |
| |
| std::map<uint32_t, RtpState> RtpVideoSender::GetRtpStates() const { |
| std::map<uint32_t, RtpState> rtp_states; |
| |
| for (size_t i = 0; i < rtp_config_.ssrcs.size(); ++i) { |
| uint32_t ssrc = rtp_config_.ssrcs[i]; |
| RTC_DCHECK_EQ(ssrc, rtp_streams_[i].rtp_rtcp->SSRC()); |
| rtp_states[ssrc] = rtp_streams_[i].rtp_rtcp->GetRtpState(); |
| |
| // Only happens during shutdown, when RTP module is already inactive, |
| // so OK to call fec generator here. |
| if (rtp_streams_[i].fec_generator) { |
| absl::optional<RtpState> fec_state = |
| rtp_streams_[i].fec_generator->GetRtpState(); |
| if (fec_state) { |
| uint32_t ssrc = rtp_config_.flexfec.ssrc; |
| rtp_states[ssrc] = *fec_state; |
| } |
| } |
| } |
| |
| for (size_t i = 0; i < rtp_config_.rtx.ssrcs.size(); ++i) { |
| uint32_t ssrc = rtp_config_.rtx.ssrcs[i]; |
| rtp_states[ssrc] = rtp_streams_[i].rtp_rtcp->GetRtxState(); |
| } |
| |
| return rtp_states; |
| } |
| |
| std::map<uint32_t, RtpPayloadState> RtpVideoSender::GetRtpPayloadStates() |
| const { |
| MutexLock lock(&mutex_); |
| std::map<uint32_t, RtpPayloadState> payload_states; |
| for (const auto& param : params_) { |
| payload_states[param.ssrc()] = param.state(); |
| payload_states[param.ssrc()].shared_frame_id = shared_frame_id_; |
| } |
| return payload_states; |
| } |
| |
| void RtpVideoSender::OnTransportOverheadChanged( |
| size_t transport_overhead_bytes_per_packet) { |
| MutexLock lock(&mutex_); |
| transport_overhead_bytes_per_packet_ = transport_overhead_bytes_per_packet; |
| |
| size_t max_rtp_packet_size = |
| std::min(rtp_config_.max_packet_size, |
| kPathMTU - transport_overhead_bytes_per_packet_); |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->SetMaxRtpPacketSize(max_rtp_packet_size); |
| } |
| } |
| |
| void RtpVideoSender::OnBitrateUpdated(BitrateAllocationUpdate update, |
| int framerate) { |
| // Substract overhead from bitrate. |
| MutexLock lock(&mutex_); |
| size_t num_active_streams = 0; |
| size_t overhead_bytes_per_packet = 0; |
| for (const auto& stream : rtp_streams_) { |
| if (stream.rtp_rtcp->SendingMedia()) { |
| overhead_bytes_per_packet += stream.rtp_rtcp->ExpectedPerPacketOverhead(); |
| ++num_active_streams; |
| } |
| } |
| if (num_active_streams > 1) { |
| overhead_bytes_per_packet /= num_active_streams; |
| } |
| |
| DataSize packet_overhead = DataSize::Bytes( |
| overhead_bytes_per_packet + transport_overhead_bytes_per_packet_); |
| DataSize max_total_packet_size = DataSize::Bytes( |
| rtp_config_.max_packet_size + transport_overhead_bytes_per_packet_); |
| uint32_t payload_bitrate_bps = update.target_bitrate.bps(); |
| if (has_packet_feedback_) { |
| DataRate overhead_rate = |
| CalculateOverheadRate(update.target_bitrate, max_total_packet_size, |
| packet_overhead, Frequency::Hertz(framerate)); |
| // TODO(srte): We probably should not accept 0 payload bitrate here. |
| payload_bitrate_bps = rtc::saturated_cast<uint32_t>(payload_bitrate_bps - |
| overhead_rate.bps()); |
| } |
| |
| // Get the encoder target rate. It is the estimated network rate - |
| // protection overhead. |
| // TODO(srte): We should multiply with 255 here. |
| encoder_target_rate_bps_ = fec_controller_->UpdateFecRates( |
| payload_bitrate_bps, framerate, |
| rtc::saturated_cast<uint8_t>(update.packet_loss_ratio * 256), |
| loss_mask_vector_, update.round_trip_time.ms()); |
| if (!fec_allowed_) { |
| encoder_target_rate_bps_ = payload_bitrate_bps; |
| // fec_controller_->UpdateFecRates() was still called so as to allow |
| // `fec_controller_` to update whatever internal state it might have, |
| // since `fec_allowed_` may be toggled back on at any moment. |
| } |
| |
| // Subtract post encode overhead from the encoder target. If target rate |
| // is really low, cap the overhead at 50%. This also avoids the case where |
| // `encoder_target_rate_bps_` is 0 due to encoder pause event while the |
| // packetization rate is positive since packets are still flowing. |
| uint32_t post_encode_overhead_bps = std::min( |
| GetPostEncodeOverhead().bps<uint32_t>(), encoder_target_rate_bps_ / 2); |
| encoder_target_rate_bps_ -= post_encode_overhead_bps; |
| |
| loss_mask_vector_.clear(); |
| |
| uint32_t encoder_overhead_rate_bps = 0; |
| if (has_packet_feedback_) { |
| // TODO(srte): The packet size should probably be the same as in the |
| // CalculateOverheadRate call above (just max_total_packet_size), it doesn't |
| // make sense to use different packet rates for different overhead |
| // calculations. |
| DataRate encoder_overhead_rate = CalculateOverheadRate( |
| DataRate::BitsPerSec(encoder_target_rate_bps_), |
| max_total_packet_size - DataSize::Bytes(overhead_bytes_per_packet), |
| packet_overhead, Frequency::Hertz(framerate)); |
| encoder_overhead_rate_bps = std::min( |
| encoder_overhead_rate.bps<uint32_t>(), |
| update.target_bitrate.bps<uint32_t>() - encoder_target_rate_bps_); |
| } |
| const uint32_t media_rate = encoder_target_rate_bps_ + |
| encoder_overhead_rate_bps + |
| post_encode_overhead_bps; |
| RTC_DCHECK_GE(update.target_bitrate, DataRate::BitsPerSec(media_rate)); |
| // `protection_bitrate_bps_` includes overhead. |
| protection_bitrate_bps_ = update.target_bitrate.bps() - media_rate; |
| } |
| |
| uint32_t RtpVideoSender::GetPayloadBitrateBps() const { |
| return encoder_target_rate_bps_; |
| } |
| |
| uint32_t RtpVideoSender::GetProtectionBitrateBps() const { |
| return protection_bitrate_bps_; |
| } |
| |
| std::vector<RtpSequenceNumberMap::Info> RtpVideoSender::GetSentRtpPacketInfos( |
| uint32_t ssrc, |
| rtc::ArrayView<const uint16_t> sequence_numbers) const { |
| for (const auto& rtp_stream : rtp_streams_) { |
| if (ssrc == rtp_stream.rtp_rtcp->SSRC()) { |
| return rtp_stream.rtp_rtcp->GetSentRtpPacketInfos(sequence_numbers); |
| } |
| } |
| return std::vector<RtpSequenceNumberMap::Info>(); |
| } |
| |
| int RtpVideoSender::ProtectionRequest(const FecProtectionParams* delta_params, |
| const FecProtectionParams* key_params, |
| uint32_t* sent_video_rate_bps, |
| uint32_t* sent_nack_rate_bps, |
| uint32_t* sent_fec_rate_bps) { |
| *sent_video_rate_bps = 0; |
| *sent_nack_rate_bps = 0; |
| *sent_fec_rate_bps = 0; |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.rtp_rtcp->SetFecProtectionParams(*delta_params, *key_params); |
| |
| auto send_bitrate = stream.rtp_rtcp->GetSendRates(); |
| *sent_video_rate_bps += send_bitrate[RtpPacketMediaType::kVideo].bps(); |
| *sent_fec_rate_bps += |
| send_bitrate[RtpPacketMediaType::kForwardErrorCorrection].bps(); |
| *sent_nack_rate_bps += |
| send_bitrate[RtpPacketMediaType::kRetransmission].bps(); |
| } |
| return 0; |
| } |
| |
| void RtpVideoSender::SetRetransmissionMode(int retransmission_mode) { |
| MutexLock lock(&mutex_); |
| for (const RtpStreamSender& stream : rtp_streams_) { |
| stream.sender_video->SetRetransmissionSetting(retransmission_mode); |
| } |
| } |
| |
| void RtpVideoSender::SetFecAllowed(bool fec_allowed) { |
| MutexLock lock(&mutex_); |
| fec_allowed_ = fec_allowed; |
| } |
| |
| void RtpVideoSender::OnPacketFeedbackVector( |
| std::vector<StreamPacketInfo> packet_feedback_vector) { |
| if (fec_controller_->UseLossVectorMask()) { |
| MutexLock lock(&mutex_); |
| for (const StreamPacketInfo& packet : packet_feedback_vector) { |
| loss_mask_vector_.push_back(!packet.received); |
| } |
| } |
| |
| // Map from SSRC to all acked packets for that RTP module. |
| std::map<uint32_t, std::vector<uint16_t>> acked_packets_per_ssrc; |
| for (const StreamPacketInfo& packet : packet_feedback_vector) { |
| if (packet.received && packet.ssrc) { |
| acked_packets_per_ssrc[*packet.ssrc].push_back( |
| packet.rtp_sequence_number); |
| } |
| } |
| |
| // Map from SSRC to vector of RTP sequence numbers that are indicated as |
| // lost by feedback, without being trailed by any received packets. |
| std::map<uint32_t, std::vector<uint16_t>> early_loss_detected_per_ssrc; |
| |
| for (const StreamPacketInfo& packet : packet_feedback_vector) { |
| // Only include new media packets, not retransmissions/padding/fec. |
| if (!packet.received && packet.ssrc && !packet.is_retransmission) { |
| // Last known lost packet, might not be detectable as lost by remote |
| // jitter buffer. |
| early_loss_detected_per_ssrc[*packet.ssrc].push_back( |
| packet.rtp_sequence_number); |
| } else { |
| // Packet received, so any loss prior to this is already detectable. |
| early_loss_detected_per_ssrc.erase(*packet.ssrc); |
| } |
| } |
| |
| for (const auto& kv : early_loss_detected_per_ssrc) { |
| const uint32_t ssrc = kv.first; |
| auto it = ssrc_to_rtp_module_.find(ssrc); |
| RTC_CHECK(it != ssrc_to_rtp_module_.end()); |
| RTPSender* rtp_sender = it->second->RtpSender(); |
| for (uint16_t sequence_number : kv.second) { |
| rtp_sender->ReSendPacket(sequence_number); |
| } |
| } |
| |
| for (const auto& kv : acked_packets_per_ssrc) { |
| const uint32_t ssrc = kv.first; |
| auto it = ssrc_to_rtp_module_.find(ssrc); |
| if (it == ssrc_to_rtp_module_.end()) { |
| // No media, likely FEC or padding. Ignore since there's no RTP history to |
| // clean up anyway. |
| continue; |
| } |
| rtc::ArrayView<const uint16_t> rtp_sequence_numbers(kv.second); |
| it->second->OnPacketsAcknowledged(rtp_sequence_numbers); |
| } |
| } |
| |
| void RtpVideoSender::SetEncodingData(size_t width, |
| size_t height, |
| size_t num_temporal_layers) { |
| fec_controller_->SetEncodingData(width, height, num_temporal_layers, |
| rtp_config_.max_packet_size); |
| } |
| |
| DataRate RtpVideoSender::CalculateOverheadRate(DataRate data_rate, |
| DataSize packet_size, |
| DataSize overhead_per_packet, |
| Frequency framerate) const { |
| Frequency packet_rate = data_rate / packet_size; |
| if (use_frame_rate_for_overhead_) { |
| framerate = std::max(framerate, Frequency::Hertz(1)); |
| DataSize frame_size = data_rate / framerate; |
| int packets_per_frame = ceil(frame_size / packet_size); |
| packet_rate = packets_per_frame * framerate; |
| } |
| return packet_rate.RoundUpTo(Frequency::Hertz(1)) * overhead_per_packet; |
| } |
| |
| } // namespace webrtc |
