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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/sender/frame_sender_impl.h"
- #include <algorithm>
- #include <limits>
- #include <memory>
- #include <utility>
- #include <vector>
- #include "base/bind.h"
- #include "base/feature_list.h"
- #include "base/logging.h"
- #include "base/numerics/safe_conversions.h"
- #include "base/trace_event/trace_event.h"
- #include "media/cast/common/openscreen_conversion_helpers.h"
- #include "media/cast/common/sender_encoded_frame.h"
- #include "media/cast/constants.h"
- namespace media::cast {
- namespace {
- constexpr int kNumAggressiveReportsSentAtStart = 100;
- constexpr base::TimeDelta kMinSchedulingDelay = base::Milliseconds(1);
- constexpr base::TimeDelta kReceiverProcessTime = base::Milliseconds(250);
- // The additional number of frames that can be in-flight when input exceeds the
- // maximum frame rate.
- constexpr int kMaxFrameBurst = 5;
- } // namespace
- // static
- std::unique_ptr<FrameSender> FrameSender::Create(
- scoped_refptr<CastEnvironment> cast_environment,
- const FrameSenderConfig& config,
- CastTransport* const transport_sender,
- Client& client) {
- return std::make_unique<FrameSenderImpl>(cast_environment, config,
- transport_sender, client);
- }
- // Convenience macro used in logging statements throughout this file.
- #define SENDER_SSRC \
- (is_audio_ ? "AUDIO[" : "VIDEO[") << config_.sender_ssrc << "] "
- FrameSenderImpl::Client::~Client() = default;
- FrameSenderImpl::RtcpClient::RtcpClient(
- base::WeakPtr<FrameSenderImpl> frame_sender)
- : frame_sender_(frame_sender) {}
- FrameSenderImpl::RtcpClient::~RtcpClient() = default;
- void FrameSenderImpl::RtcpClient::OnReceivedCastMessage(
- const RtcpCastMessage& cast_message) {
- if (frame_sender_)
- frame_sender_->OnReceivedCastFeedback(cast_message);
- }
- void FrameSenderImpl::RtcpClient::OnReceivedRtt(
- base::TimeDelta round_trip_time) {
- if (frame_sender_)
- frame_sender_->OnMeasuredRoundTripTime(round_trip_time);
- }
- void FrameSenderImpl::RtcpClient::OnReceivedPli() {
- if (frame_sender_)
- frame_sender_->OnReceivedPli();
- }
- FrameSenderImpl::FrameSenderImpl(
- scoped_refptr<CastEnvironment> cast_environment,
- const FrameSenderConfig& config,
- CastTransport* const transport_sender,
- Client& client)
- : cast_environment_(cast_environment),
- config_(config),
- target_playout_delay_(config.max_playout_delay),
- max_frame_rate_(config.max_frame_rate),
- transport_sender_(transport_sender),
- client_(client),
- is_audio_(config.rtp_payload_type <= RtpPayloadType::AUDIO_LAST),
- // We only use the adaptive control for software video encoding.
- congestion_control_(
- (!config.use_external_encoder && !is_audio_)
- ? NewAdaptiveCongestionControl(cast_environment->Clock(),
- config.max_bitrate,
- config.min_bitrate,
- max_frame_rate_)
- : NewFixedCongestionControl(
- (config.min_bitrate + config.max_bitrate) / 2)
- ),
- max_ack_delay_(config_.max_playout_delay) {
- DCHECK(transport_sender_);
- DCHECK_GT(config_.rtp_timebase, 0);
- DCHECK(congestion_control_);
- // We assume animated content to begin with since that is the common use
- // case today.
- VLOG(1) << SENDER_SSRC << "min latency "
- << config_.min_playout_delay.InMilliseconds() << "max latency "
- << config_.max_playout_delay.InMilliseconds() << "animated latency "
- << config_.animated_playout_delay.InMilliseconds();
- SetTargetPlayoutDelay(config_.animated_playout_delay);
- CastTransportRtpConfig transport_config;
- transport_config.ssrc = config.sender_ssrc;
- transport_config.feedback_ssrc = config.receiver_ssrc;
- transport_config.rtp_payload_type = config.rtp_payload_type;
- transport_config.aes_key = config.aes_key;
- transport_config.aes_iv_mask = config.aes_iv_mask;
- transport_sender_->InitializeStream(
- transport_config, std::make_unique<FrameSenderImpl::RtcpClient>(
- weak_factory_.GetWeakPtr()));
- }
- FrameSenderImpl::~FrameSenderImpl() = default;
- bool FrameSenderImpl::NeedsKeyFrame() const {
- return picture_lost_at_receiver_;
- }
- base::TimeTicks FrameSenderImpl::GetRecordedReferenceTime(
- FrameId frame_id) const {
- return frame_reference_times_[frame_id.lower_8_bits()];
- }
- void FrameSenderImpl::ScheduleNextRtcpReport() {
- DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
- cast_environment_->PostDelayedTask(
- CastEnvironment::MAIN, FROM_HERE,
- base::BindOnce(&FrameSenderImpl::SendRtcpReport,
- weak_factory_.GetWeakPtr(), true),
- kRtcpReportInterval);
- }
- void FrameSenderImpl::SendRtcpReport(bool schedule_future_reports) {
- DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
- // Sanity-check: We should have sent at least the first frame by this point.
- DCHECK(!last_send_time_.is_null());
- // Create lip-sync info for the sender report. The last sent frame's
- // reference time and RTP timestamp are used to estimate an RTP timestamp in
- // terms of "now." Note that |now| is never likely to be precise to an exact
- // frame boundary; and so the computation here will result in a
- // |now_as_rtp_timestamp| value that is rarely equal to any one emitted by the
- // encoder.
- const base::TimeTicks now = cast_environment_->Clock()->NowTicks();
- const base::TimeDelta time_delta =
- now - GetRecordedReferenceTime(last_sent_frame_id_);
- const RtpTimeDelta rtp_delta =
- ToRtpTimeDelta(time_delta, config_.rtp_timebase);
- const RtpTimeTicks now_as_rtp_timestamp =
- GetRecordedRtpTimestamp(last_sent_frame_id_) + rtp_delta;
- transport_sender_->SendSenderReport(config_.sender_ssrc, now,
- now_as_rtp_timestamp);
- if (schedule_future_reports)
- ScheduleNextRtcpReport();
- }
- void FrameSenderImpl::OnMeasuredRoundTripTime(base::TimeDelta round_trip_time) {
- DCHECK_GT(round_trip_time, base::TimeDelta());
- current_round_trip_time_ = round_trip_time;
- max_ack_delay_ = 2 * std::max(current_round_trip_time_, base::TimeDelta()) +
- kReceiverProcessTime;
- max_ack_delay_ = std::min(max_ack_delay_, target_playout_delay_);
- }
- void FrameSenderImpl::SetTargetPlayoutDelay(
- base::TimeDelta new_target_playout_delay) {
- if (send_target_playout_delay_ &&
- target_playout_delay_ == new_target_playout_delay) {
- return;
- }
- new_target_playout_delay =
- std::max(new_target_playout_delay, config_.min_playout_delay);
- new_target_playout_delay =
- std::min(new_target_playout_delay, config_.max_playout_delay);
- VLOG(2) << SENDER_SSRC << "Target playout delay changing from "
- << target_playout_delay_.InMilliseconds() << " ms to "
- << new_target_playout_delay.InMilliseconds() << " ms.";
- target_playout_delay_ = new_target_playout_delay;
- max_ack_delay_ = std::min(max_ack_delay_, target_playout_delay_);
- send_target_playout_delay_ = true;
- congestion_control_->UpdateTargetPlayoutDelay(target_playout_delay_);
- }
- base::TimeDelta FrameSenderImpl::GetTargetPlayoutDelay() const {
- return target_playout_delay_;
- }
- void FrameSenderImpl::ResendCheck() {
- DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
- DCHECK(!last_send_time_.is_null());
- const base::TimeDelta time_since_last_send =
- cast_environment_->Clock()->NowTicks() - last_send_time_;
- if (time_since_last_send > max_ack_delay_) {
- if (latest_acked_frame_id_ == last_sent_frame_id_) {
- // Last frame acked, no point in doing anything
- } else {
- VLOG(1) << SENDER_SSRC
- << "ACK timeout; last acked frame: " << latest_acked_frame_id_;
- ResendForKickstart();
- }
- }
- ScheduleNextResendCheck();
- }
- void FrameSenderImpl::ScheduleNextResendCheck() {
- DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
- DCHECK(!last_send_time_.is_null());
- base::TimeDelta time_to_next =
- last_send_time_ - cast_environment_->Clock()->NowTicks() + max_ack_delay_;
- time_to_next = std::max(time_to_next, kMinSchedulingDelay);
- cast_environment_->PostDelayedTask(
- CastEnvironment::MAIN, FROM_HERE,
- base::BindOnce(&FrameSenderImpl::ResendCheck, weak_factory_.GetWeakPtr()),
- time_to_next);
- }
- void FrameSenderImpl::ResendForKickstart() {
- DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
- DCHECK(!last_send_time_.is_null());
- VLOG(1) << SENDER_SSRC << "Resending last packet of frame "
- << last_sent_frame_id_ << " to kick-start.";
- last_send_time_ = cast_environment_->Clock()->NowTicks();
- transport_sender_->ResendFrameForKickstart(config_.sender_ssrc,
- last_sent_frame_id_);
- }
- void FrameSenderImpl::RecordLatestFrameTimestamps(
- FrameId frame_id,
- base::TimeTicks reference_time,
- RtpTimeTicks rtp_timestamp) {
- DCHECK(!reference_time.is_null());
- frame_reference_times_[frame_id.lower_8_bits()] = reference_time;
- frame_rtp_timestamps_[frame_id.lower_8_bits()] = rtp_timestamp;
- }
- base::TimeDelta FrameSenderImpl::GetInFlightMediaDuration() const {
- const base::TimeDelta encoder_duration = client_.GetEncoderBacklogDuration();
- // No frames are in flight, so only look at the encoder duration.
- if (last_sent_frame_id_ == latest_acked_frame_id_) {
- return encoder_duration;
- }
- const RtpTimeTicks oldest_acked_timestamp =
- GetRecordedRtpTimestamp(latest_acked_frame_id_);
- const RtpTimeTicks newest_acked_timestamp =
- GetRecordedRtpTimestamp(last_sent_frame_id_);
- return ToTimeDelta(newest_acked_timestamp - oldest_acked_timestamp,
- config_.rtp_timebase) +
- encoder_duration;
- }
- RtpTimeTicks FrameSenderImpl::GetRecordedRtpTimestamp(FrameId frame_id) const {
- return frame_rtp_timestamps_[frame_id.lower_8_bits()];
- }
- int FrameSenderImpl::GetUnacknowledgedFrameCount() const {
- if (last_send_time_.is_null())
- return 0;
- const int count = last_sent_frame_id_ - latest_acked_frame_id_;
- DCHECK_GE(count, 0);
- return count;
- }
- int FrameSenderImpl::GetSuggestedBitrate(base::TimeTicks playout_time,
- base::TimeDelta playout_delay) {
- return congestion_control_->GetBitrate(playout_time, playout_delay);
- }
- double FrameSenderImpl::MaxFrameRate() const {
- return max_frame_rate_;
- }
- void FrameSenderImpl::SetMaxFrameRate(double max_frame_rate) {
- max_frame_rate_ = max_frame_rate;
- }
- base::TimeDelta FrameSenderImpl::TargetPlayoutDelay() const {
- return target_playout_delay_;
- }
- base::TimeDelta FrameSenderImpl::CurrentRoundTripTime() const {
- return current_round_trip_time_;
- }
- base::TimeTicks FrameSenderImpl::LastSendTime() const {
- return last_send_time_;
- }
- FrameId FrameSenderImpl::LatestAckedFrameId() const {
- return latest_acked_frame_id_;
- }
- base::TimeDelta FrameSenderImpl::GetAllowedInFlightMediaDuration() const {
- // The total amount allowed in-flight media should equal the amount that fits
- // within the entire playout delay window, plus the amount of time it takes to
- // receive an ACK from the receiver.
- return target_playout_delay_ + (current_round_trip_time_ / 2);
- }
- void FrameSenderImpl::EnqueueFrame(
- std::unique_ptr<SenderEncodedFrame> encoded_frame) {
- DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
- VLOG(2) << SENDER_SSRC
- << "About to send another frame: last_sent=" << last_sent_frame_id_
- << ", latest_acked=" << latest_acked_frame_id_;
- const FrameId frame_id = encoded_frame->frame_id;
- const bool is_first_frame_to_be_sent = last_send_time_.is_null();
- if (picture_lost_at_receiver_ &&
- (encoded_frame->dependency == EncodedFrame::KEY)) {
- picture_lost_at_receiver_ = false;
- DCHECK(frame_id > latest_acked_frame_id_);
- // Cancel sending remaining frames.
- std::vector<FrameId> cancel_sending_frames;
- for (FrameId id = latest_acked_frame_id_ + 1; id < frame_id; ++id) {
- cancel_sending_frames.push_back(id);
- client_.OnFrameCanceled(id);
- }
- transport_sender_->CancelSendingFrames(config_.sender_ssrc,
- cancel_sending_frames);
- }
- last_send_time_ = cast_environment_->Clock()->NowTicks();
- DCHECK(frame_id > last_sent_frame_id_) << "enqueued frames out of order.";
- last_sent_frame_id_ = frame_id;
- // If this is the first frame about to be sent, fake the value of
- // |latest_acked_frame_id_| to indicate the receiver starts out all
- // caught up. Also, schedule the periodic frame re-send checks.
- if (is_first_frame_to_be_sent) {
- latest_acked_frame_id_ = frame_id - 1;
- ScheduleNextResendCheck();
- }
- VLOG_IF(1, !is_audio_ && encoded_frame->dependency == EncodedFrame::KEY)
- << SENDER_SSRC << "Sending encoded key frame, id=" << frame_id;
- std::unique_ptr<FrameEvent> encode_event(new FrameEvent());
- encode_event->timestamp = encoded_frame->encode_completion_time;
- encode_event->type = FRAME_ENCODED;
- encode_event->media_type = is_audio_ ? AUDIO_EVENT : VIDEO_EVENT;
- encode_event->rtp_timestamp = encoded_frame->rtp_timestamp;
- encode_event->frame_id = frame_id;
- encode_event->size = base::checked_cast<uint32_t>(encoded_frame->data.size());
- encode_event->key_frame = encoded_frame->dependency == EncodedFrame::KEY;
- encode_event->target_bitrate = encoded_frame->encoder_bitrate;
- encode_event->encoder_cpu_utilization = encoded_frame->encoder_utilization;
- encode_event->idealized_bitrate_utilization = encoded_frame->lossiness;
- cast_environment_->logger()->DispatchFrameEvent(std::move(encode_event));
- RecordLatestFrameTimestamps(frame_id, encoded_frame->reference_time,
- encoded_frame->rtp_timestamp);
- if (!is_audio_) {
- // Used by chrome/browser/media/cast_mirroring_performance_browsertest.cc
- TRACE_EVENT_INSTANT1("cast_perf_test", "VideoFrameEncoded",
- TRACE_EVENT_SCOPE_THREAD, "rtp_timestamp",
- encoded_frame->rtp_timestamp.lower_32_bits());
- }
- // At the start of the session, it's important to send reports before each
- // frame so that the receiver can properly compute playout times. The reason
- // more than one report is sent is because transmission is not guaranteed,
- // only best effort, so send enough that one should almost certainly get
- // through.
- if (num_aggressive_rtcp_reports_sent_ < kNumAggressiveReportsSentAtStart) {
- // SendRtcpReport() will schedule future reports to be made if this is the
- // last "aggressive report."
- ++num_aggressive_rtcp_reports_sent_;
- const bool is_last_aggressive_report =
- (num_aggressive_rtcp_reports_sent_ == kNumAggressiveReportsSentAtStart);
- VLOG_IF(1, is_last_aggressive_report)
- << SENDER_SSRC << "Sending last aggressive report.";
- SendRtcpReport(is_last_aggressive_report);
- }
- congestion_control_->WillSendFrameToTransport(
- frame_id, encoded_frame->data.size(), last_send_time_);
- if (send_target_playout_delay_) {
- encoded_frame->new_playout_delay_ms =
- target_playout_delay_.InMilliseconds();
- }
- const char* name = is_audio_ ? "Audio Transport" : "Video Transport";
- TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(
- "cast.stream", name, TRACE_ID_WITH_SCOPE(name, frame_id.lower_32_bits()),
- "rtp_timestamp", encoded_frame->rtp_timestamp.lower_32_bits());
- transport_sender_->InsertFrame(config_.sender_ssrc, *encoded_frame);
- }
- void FrameSenderImpl::OnReceivedCastFeedback(
- const RtcpCastMessage& cast_feedback) {
- DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
- const bool have_valid_rtt = current_round_trip_time_.is_positive();
- if (have_valid_rtt) {
- congestion_control_->UpdateRtt(current_round_trip_time_);
- // Having the RTT value implies the receiver sent back a receiver report
- // based on it having received a report from here. Therefore, ensure this
- // sender stops aggressively sending reports.
- if (num_aggressive_rtcp_reports_sent_ < kNumAggressiveReportsSentAtStart) {
- VLOG(1) << SENDER_SSRC
- << "No longer a need to send reports aggressively (sent "
- << num_aggressive_rtcp_reports_sent_ << ").";
- num_aggressive_rtcp_reports_sent_ = kNumAggressiveReportsSentAtStart;
- ScheduleNextRtcpReport();
- }
- }
- if (last_send_time_.is_null())
- return; // Cannot get an ACK without having first sent a frame.
- if (cast_feedback.missing_frames_and_packets.empty() &&
- cast_feedback.received_later_frames.empty()) {
- if (latest_acked_frame_id_ == cast_feedback.ack_frame_id) {
- VLOG(1) << SENDER_SSRC << "Received duplicate ACK for frame "
- << latest_acked_frame_id_;
- TRACE_EVENT_INSTANT2(
- "cast.stream", "Duplicate ACK", TRACE_EVENT_SCOPE_THREAD,
- "ack_frame_id", cast_feedback.ack_frame_id.lower_32_bits(),
- "last_sent_frame_id", last_sent_frame_id_.lower_32_bits());
- }
- // We only count duplicate ACKs when we have sent newer frames.
- if (latest_acked_frame_id_ == cast_feedback.ack_frame_id &&
- latest_acked_frame_id_ != last_sent_frame_id_) {
- duplicate_ack_counter_++;
- } else {
- duplicate_ack_counter_ = 0;
- }
- if (duplicate_ack_counter_ >= 2 && duplicate_ack_counter_ % 3 == 2) {
- ResendForKickstart();
- }
- } else {
- // Only count duplicated ACKs if there is no NACK request in between.
- // This is to avoid aggressive resend.
- duplicate_ack_counter_ = 0;
- }
- base::TimeTicks now = cast_environment_->Clock()->NowTicks();
- congestion_control_->AckFrame(cast_feedback.ack_frame_id, now);
- if (!cast_feedback.received_later_frames.empty()) {
- // Ack the received frames.
- congestion_control_->AckLaterFrames(cast_feedback.received_later_frames,
- now);
- }
- std::unique_ptr<FrameEvent> ack_event(new FrameEvent());
- ack_event->timestamp = now;
- ack_event->type = FRAME_ACK_RECEIVED;
- ack_event->media_type = is_audio_ ? AUDIO_EVENT : VIDEO_EVENT;
- ack_event->rtp_timestamp =
- GetRecordedRtpTimestamp(cast_feedback.ack_frame_id);
- ack_event->frame_id = cast_feedback.ack_frame_id;
- cast_environment_->logger()->DispatchFrameEvent(std::move(ack_event));
- const bool is_acked_out_of_order =
- cast_feedback.ack_frame_id < latest_acked_frame_id_;
- VLOG(2) << SENDER_SSRC << "Received ACK"
- << (is_acked_out_of_order ? " out-of-order" : "") << " for frame "
- << cast_feedback.ack_frame_id;
- if (is_acked_out_of_order) {
- TRACE_EVENT_INSTANT2(
- "cast.stream", "ACK out of order", TRACE_EVENT_SCOPE_THREAD,
- "ack_frame_id", cast_feedback.ack_frame_id.lower_32_bits(),
- "latest_acked_frame_id", latest_acked_frame_id_.lower_32_bits());
- } else if (latest_acked_frame_id_ < cast_feedback.ack_frame_id) {
- // Cancel resends of acked frames.
- std::vector<FrameId> frames_to_cancel;
- frames_to_cancel.reserve(cast_feedback.ack_frame_id -
- latest_acked_frame_id_);
- do {
- ++latest_acked_frame_id_;
- frames_to_cancel.push_back(latest_acked_frame_id_);
- client_.OnFrameCanceled(latest_acked_frame_id_);
- // This is a good place to match the trace for frame ids
- // since this ensures we not only track frame ids that are
- // implicitly ACKed, but also handles duplicate ACKs
- const char* name = is_audio_ ? "Audio Transport" : "Video Transport";
- TRACE_EVENT_NESTABLE_ASYNC_END1(
- "cast.stream", name,
- TRACE_ID_WITH_SCOPE(name, latest_acked_frame_id_.lower_32_bits()),
- "RTT_usecs", current_round_trip_time_.InMicroseconds());
- } while (latest_acked_frame_id_ < cast_feedback.ack_frame_id);
- transport_sender_->CancelSendingFrames(config_.sender_ssrc,
- frames_to_cancel);
- }
- }
- void FrameSenderImpl::OnReceivedPli() {
- picture_lost_at_receiver_ = true;
- }
- bool FrameSenderImpl::ShouldDropNextFrame(
- base::TimeDelta frame_duration) const {
- // Check that accepting the next frame won't cause more frames to become
- // in-flight than the system's design limit.
- const int count_frames_in_flight =
- GetUnacknowledgedFrameCount() + client_.GetNumberOfFramesInEncoder();
- if (count_frames_in_flight >= kMaxUnackedFrames) {
- VLOG(1) << SENDER_SSRC << "Dropping: Too many frames would be in-flight.";
- return true;
- }
- // Check that accepting the next frame won't exceed the configured maximum
- // frame rate, allowing for short-term bursts.
- const base::TimeDelta duration_in_flight = GetInFlightMediaDuration();
- const double max_frames_in_flight =
- max_frame_rate_ * duration_in_flight.InSecondsF();
- if (count_frames_in_flight >= max_frames_in_flight + kMaxFrameBurst) {
- VLOG(1) << SENDER_SSRC << "Dropping: Burst threshold would be exceeded.";
- return true;
- }
- // Check that accepting the next frame won't exceed the allowed in-flight
- // media duration.
- const base::TimeDelta duration_would_be_in_flight =
- duration_in_flight + frame_duration;
- const base::TimeDelta allowed_in_flight = GetAllowedInFlightMediaDuration();
- if (VLOG_IS_ON(1)) {
- const int64_t percent =
- allowed_in_flight.is_positive()
- ? base::ClampRound<int64_t>(duration_would_be_in_flight /
- allowed_in_flight * 100)
- : std::numeric_limits<int64_t>::max();
- VLOG_IF(1, percent > 50)
- << SENDER_SSRC << duration_in_flight.InMicroseconds()
- << " usec in-flight + " << frame_duration.InMicroseconds()
- << " usec for next frame --> " << percent << "% of allowed in-flight.";
- }
- if (duration_would_be_in_flight > allowed_in_flight) {
- VLOG(1) << SENDER_SSRC << "Dropping: In-flight duration would be too high.";
- return true;
- }
- // Next frame is accepted.
- return false;
- }
- } // namespace media::cast
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