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https://github.com/mollyim/webrtc.git
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2b5beb98dd
Allow absolute send time to go back in time as long as there has not been a large gap in arival time. Use the first packets arival time as time base. Bug: b/282153758, webrtc:15230 Change-Id: I8663079ab9c202079bf8db303353918d46ba1d98 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/308142 Commit-Queue: Per Kjellander <perkj@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40251}
113 lines
4.6 KiB
C++
113 lines
4.6 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_ESTIMATOR_PROXY_H_
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#define MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_ESTIMATOR_PROXY_H_
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#include <deque>
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#include <functional>
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#include <memory>
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#include <vector>
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#include "absl/types/optional.h"
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#include "api/field_trials_view.h"
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#include "api/rtp_headers.h"
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#include "api/transport/network_control.h"
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#include "api/units/data_size.h"
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#include "api/units/time_delta.h"
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#include "api/units/timestamp.h"
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#include "modules/remote_bitrate_estimator/packet_arrival_map.h"
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#include "modules/rtp_rtcp/source/rtcp_packet.h"
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#include "modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h"
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#include "modules/rtp_rtcp/source/rtp_packet_received.h"
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#include "rtc_base/numerics/sequence_number_unwrapper.h"
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#include "rtc_base/synchronization/mutex.h"
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namespace webrtc {
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// Class used when send-side BWE is enabled: This proxy is instantiated on the
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// receive side. It buffers a number of receive timestamps and then sends
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// transport feedback messages back too the send side.
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class RemoteEstimatorProxy {
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public:
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// Used for sending transport feedback messages when send side
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// BWE is used.
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using TransportFeedbackSender = std::function<void(
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std::vector<std::unique_ptr<rtcp::RtcpPacket>> packets)>;
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RemoteEstimatorProxy(TransportFeedbackSender feedback_sender,
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NetworkStateEstimator* network_state_estimator);
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~RemoteEstimatorProxy();
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void IncomingPacket(const RtpPacketReceived& packet);
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// Sends periodic feedback if it is time to send it.
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// Returns time until next call to Process should be made.
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TimeDelta Process(Timestamp now);
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void OnBitrateChanged(int bitrate);
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void SetTransportOverhead(DataSize overhead_per_packet);
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private:
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void MaybeCullOldPackets(int64_t sequence_number, Timestamp arrival_time)
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RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
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void SendPeriodicFeedbacks() RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
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void SendFeedbackOnRequest(int64_t sequence_number,
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const FeedbackRequest& feedback_request)
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RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
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// Returns a Transport Feedback packet with information about as many packets
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// that has been received between [`begin_sequence_number_incl`,
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// `end_sequence_number_excl`) that can fit in it. If `is_periodic_update`,
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// this represents sending a periodic feedback message, which will make it
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// update the `periodic_window_start_seq_` variable with the first packet that
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// was not included in the feedback packet, so that the next update can
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// continue from that sequence number.
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//
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// If no incoming packets were added, nullptr is returned.
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//
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// `include_timestamps` decide if the returned TransportFeedback should
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// include timestamps.
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std::unique_ptr<rtcp::TransportFeedback> MaybeBuildFeedbackPacket(
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bool include_timestamps,
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int64_t begin_sequence_number_inclusive,
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int64_t end_sequence_number_exclusive,
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bool is_periodic_update) RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
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const TransportFeedbackSender feedback_sender_;
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Timestamp last_process_time_;
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Mutex lock_;
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// `network_state_estimator_` may be null.
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NetworkStateEstimator* const network_state_estimator_
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RTC_PT_GUARDED_BY(&lock_);
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uint32_t media_ssrc_ RTC_GUARDED_BY(&lock_);
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uint8_t feedback_packet_count_ RTC_GUARDED_BY(&lock_);
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SeqNumUnwrapper<uint16_t> unwrapper_ RTC_GUARDED_BY(&lock_);
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DataSize packet_overhead_ RTC_GUARDED_BY(&lock_);
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// The next sequence number that should be the start sequence number during
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// periodic reporting. Will be absl::nullopt before the first seen packet.
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absl::optional<int64_t> periodic_window_start_seq_ RTC_GUARDED_BY(&lock_);
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// Packet arrival times, by sequence number.
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PacketArrivalTimeMap packet_arrival_times_ RTC_GUARDED_BY(&lock_);
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TimeDelta send_interval_ RTC_GUARDED_BY(&lock_);
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bool send_periodic_feedback_ RTC_GUARDED_BY(&lock_);
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// Unwraps absolute send times.
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uint32_t previous_abs_send_time_ RTC_GUARDED_BY(&lock_);
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Timestamp abs_send_timestamp_ RTC_GUARDED_BY(&lock_);
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Timestamp last_arrival_time_with_abs_send_time_ RTC_GUARDED_BY(&lock_);
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};
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} // namespace webrtc
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#endif // MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_ESTIMATOR_PROXY_H_
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