blob: b50d2f0db08d5020c500efca9adebab9e8eb16a6 [file] [log] [blame]
* 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 <deque>
#include <functional>
#include <memory>
#include <vector>
#include "absl/types/optional.h"
#include "api/field_trials_view.h"
#include "api/rtp_headers.h"
#include "api/transport/network_control.h"
#include "api/units/data_size.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "modules/remote_bitrate_estimator/packet_arrival_map.h"
#include "modules/rtp_rtcp/source/rtcp_packet.h"
#include "modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h"
#include "modules/rtp_rtcp/source/rtp_packet_received.h"
#include "rtc_base/numerics/sequence_number_unwrapper.h"
#include "rtc_base/synchronization/mutex.h"
namespace webrtc {
// Class used when send-side BWE is enabled: This proxy is instantiated on the
// receive side. It buffers a number of receive timestamps and then sends
// transport feedback messages back too the send side.
class RemoteEstimatorProxy {
// Used for sending transport feedback messages when send side
// BWE is used.
using TransportFeedbackSender = std::function<void(
std::vector<std::unique_ptr<rtcp::RtcpPacket>> packets)>;
RemoteEstimatorProxy(TransportFeedbackSender feedback_sender,
NetworkStateEstimator* network_state_estimator);
void IncomingPacket(const RtpPacketReceived& packet);
// Sends periodic feedback if it is time to send it.
// Returns time until next call to Process should be made.
TimeDelta Process(Timestamp now);
void OnBitrateChanged(int bitrate);
void SetTransportOverhead(DataSize overhead_per_packet);
void MaybeCullOldPackets(int64_t sequence_number, Timestamp arrival_time)
void SendPeriodicFeedbacks() RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
void SendFeedbackOnRequest(int64_t sequence_number,
const FeedbackRequest& feedback_request)
// Returns a Transport Feedback packet with information about as many packets
// that has been received between [`begin_sequence_number_incl`,
// `end_sequence_number_excl`) that can fit in it. If `is_periodic_update`,
// this represents sending a periodic feedback message, which will make it
// update the `periodic_window_start_seq_` variable with the first packet that
// was not included in the feedback packet, so that the next update can
// continue from that sequence number.
// If no incoming packets were added, nullptr is returned.
// `include_timestamps` decide if the returned TransportFeedback should
// include timestamps.
std::unique_ptr<rtcp::TransportFeedback> MaybeBuildFeedbackPacket(
bool include_timestamps,
int64_t begin_sequence_number_inclusive,
int64_t end_sequence_number_exclusive,
bool is_periodic_update) RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
const TransportFeedbackSender feedback_sender_;
Timestamp last_process_time_;
Mutex lock_;
// `network_state_estimator_` may be null.
NetworkStateEstimator* const network_state_estimator_
uint32_t media_ssrc_ RTC_GUARDED_BY(&lock_);
uint8_t feedback_packet_count_ RTC_GUARDED_BY(&lock_);
SeqNumUnwrapper<uint16_t> unwrapper_ RTC_GUARDED_BY(&lock_);
DataSize packet_overhead_ RTC_GUARDED_BY(&lock_);
// The next sequence number that should be the start sequence number during
// periodic reporting. Will be absl::nullopt before the first seen packet.
absl::optional<int64_t> periodic_window_start_seq_ RTC_GUARDED_BY(&lock_);
// Packet arrival times, by sequence number.
PacketArrivalTimeMap packet_arrival_times_ RTC_GUARDED_BY(&lock_);
TimeDelta send_interval_ RTC_GUARDED_BY(&lock_);
bool send_periodic_feedback_ RTC_GUARDED_BY(&lock_);
// Unwraps absolute send times.
uint32_t previous_abs_send_time_ RTC_GUARDED_BY(&lock_);
Timestamp abs_send_timestamp_ RTC_GUARDED_BY(&lock_);
Timestamp last_arrival_time_with_abs_send_time_ RTC_GUARDED_BY(&lock_);
} // namespace webrtc