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/*
* Copyright (c) 2012 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.
*/
#ifndef MODULES_RTP_RTCP_SOURCE_RTCP_RECEIVER_H_
#define MODULES_RTP_RTCP_SOURCE_RTCP_RECEIVER_H_
#include <list>
#include <map>
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/sequence_checker.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "modules/rtp_rtcp/include/report_block_data.h"
#include "modules/rtp_rtcp/include/rtcp_statistics.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/rtcp_nack_stats.h"
#include "modules/rtp_rtcp/source/rtcp_packet/dlrr.h"
#include "modules/rtp_rtcp/source/rtcp_packet/tmmb_item.h"
#include "modules/rtp_rtcp/source/rtp_rtcp_interface.h"
#include "rtc_base/containers/flat_map.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/thread_annotations.h"
#include "system_wrappers/include/ntp_time.h"
namespace webrtc {
class ModuleRtpRtcpImpl2;
class VideoBitrateAllocationObserver;
namespace rtcp {
class CommonHeader;
class ReportBlock;
class Rrtr;
class TargetBitrate;
class TmmbItem;
} // namespace rtcp
class RTCPReceiver final {
public:
class ModuleRtpRtcp {
public:
virtual void SetTmmbn(std::vector<rtcp::TmmbItem> bounding_set) = 0;
virtual void OnRequestSendReport() = 0;
virtual void OnReceivedNack(
const std::vector<uint16_t>& nack_sequence_numbers) = 0;
virtual void OnReceivedRtcpReportBlocks(
rtc::ArrayView<const ReportBlockData> report_blocks) = 0;
protected:
virtual ~ModuleRtpRtcp() = default;
};
// Standardized stats derived from the non-sender RTT.
class NonSenderRttStats {
public:
NonSenderRttStats() = default;
NonSenderRttStats(const NonSenderRttStats&) = default;
NonSenderRttStats& operator=(const NonSenderRttStats&) = default;
~NonSenderRttStats() = default;
void Update(TimeDelta non_sender_rtt_seconds) {
round_trip_time_ = non_sender_rtt_seconds;
total_round_trip_time_ += non_sender_rtt_seconds;
round_trip_time_measurements_++;
}
void Invalidate() { round_trip_time_.reset(); }
// https://www.w3.org/TR/webrtc-stats/#dom-rtcremoteoutboundrtpstreamstats-roundtriptime
absl::optional<TimeDelta> round_trip_time() const {
return round_trip_time_;
}
// https://www.w3.org/TR/webrtc-stats/#dom-rtcremoteoutboundrtpstreamstats-totalroundtriptime
TimeDelta total_round_trip_time() const { return total_round_trip_time_; }
// https://www.w3.org/TR/webrtc-stats/#dom-rtcremoteoutboundrtpstreamstats-roundtriptimemeasurements
int round_trip_time_measurements() const {
return round_trip_time_measurements_;
}
private:
absl::optional<TimeDelta> round_trip_time_;
TimeDelta total_round_trip_time_ = TimeDelta::Zero();
int round_trip_time_measurements_ = 0;
};
RTCPReceiver(const RtpRtcpInterface::Configuration& config,
ModuleRtpRtcp* owner);
RTCPReceiver(const RtpRtcpInterface::Configuration& config,
ModuleRtpRtcpImpl2* owner);
~RTCPReceiver();
void IncomingPacket(rtc::ArrayView<const uint8_t> packet);
int64_t LastReceivedReportBlockMs() const;
void set_local_media_ssrc(uint32_t ssrc);
uint32_t local_media_ssrc() const;
void SetRemoteSSRC(uint32_t ssrc);
uint32_t RemoteSSRC() const;
bool receiver_only() const { return receiver_only_; }
// Returns stats based on the received RTCP Sender Reports.
absl::optional<RtpRtcpInterface::SenderReportStats> GetSenderReportStats()
const;
std::vector<rtcp::ReceiveTimeInfo> ConsumeReceivedXrReferenceTimeInfo();
absl::optional<TimeDelta> AverageRtt() const;
absl::optional<TimeDelta> LastRtt() const;
// Returns non-sender RTT metrics for the remote SSRC.
NonSenderRttStats GetNonSenderRTT() const;
void SetNonSenderRttMeasurement(bool enabled);
absl::optional<TimeDelta> GetAndResetXrRrRtt();
// Called once per second on the worker thread to do rtt calculations.
// Returns an optional rtt value if one is available.
absl::optional<TimeDelta> OnPeriodicRttUpdate(Timestamp newer_than,
bool sending);
// A snapshot of Report Blocks with additional data of interest to statistics.
// Within this list, the source SSRC is unique and ReportBlockData represents
// the latest Report Block that was received for that SSRC.
std::vector<ReportBlockData> GetLatestReportBlockData() const;
// Returns true if we haven't received an RTCP RR for several RTCP
// intervals, but only triggers true once.
bool RtcpRrTimeout();
// Returns true if we haven't received an RTCP RR telling the receive side
// has not received RTP packets for too long, i.e. extended highest sequence
// number hasn't increased for several RTCP intervals. The function only
// returns true once until a new RR is received.
bool RtcpRrSequenceNumberTimeout();
std::vector<rtcp::TmmbItem> TmmbrReceived();
// Return true if new bandwidth should be set.
bool UpdateTmmbrTimers();
std::vector<rtcp::TmmbItem> BoundingSet(bool* tmmbr_owner);
// Set new bandwidth and notify remote clients about it.
void NotifyTmmbrUpdated();
private:
#if RTC_DCHECK_IS_ON
class CustomSequenceChecker : public SequenceChecker {
public:
explicit CustomSequenceChecker(bool disable_checks)
: disable_checks_(disable_checks) {}
bool IsCurrent() const {
if (disable_checks_)
return true;
return SequenceChecker::IsCurrent();
}
private:
const bool disable_checks_;
};
#else
class CustomSequenceChecker : public SequenceChecker {
public:
explicit CustomSequenceChecker(bool) {}
};
#endif
// A lightweight inlined set of local SSRCs.
class RegisteredSsrcs {
public:
static constexpr size_t kMediaSsrcIndex = 0;
// Initializes the set of registered local SSRCS by extracting them from the
// provided `config`. The `disable_sequence_checker` flag is a workaround
// to be able to use a sequence checker without breaking downstream
// code that currently doesn't follow the same threading rules as webrtc.
RegisteredSsrcs(bool disable_sequence_checker,
const RtpRtcpInterface::Configuration& config);
// Indicates if `ssrc` is in the set of registered local SSRCs.
bool contains(uint32_t ssrc) const;
uint32_t media_ssrc() const;
void set_media_ssrc(uint32_t ssrc);
private:
RTC_NO_UNIQUE_ADDRESS CustomSequenceChecker packet_sequence_checker_;
absl::InlinedVector<uint32_t, kMaxSimulcastStreams> ssrcs_
RTC_GUARDED_BY(packet_sequence_checker_);
};
struct PacketInformation;
// Structure for handing TMMBR and TMMBN rtcp messages (RFC5104,
// section 3.5.4).
struct TmmbrInformation {
struct TimedTmmbrItem {
rtcp::TmmbItem tmmbr_item;
Timestamp last_updated = Timestamp::Zero();
};
Timestamp last_time_received = Timestamp::Zero();
bool ready_for_delete = false;
std::vector<rtcp::TmmbItem> tmmbn;
std::map<uint32_t, TimedTmmbrItem> tmmbr;
};
// Structure for storing received RRTR RTCP messages (RFC3611, section 4.4).
struct RrtrInformation {
RrtrInformation(uint32_t ssrc,
uint32_t received_remote_mid_ntp_time,
uint32_t local_receive_mid_ntp_time)
: ssrc(ssrc),
received_remote_mid_ntp_time(received_remote_mid_ntp_time),
local_receive_mid_ntp_time(local_receive_mid_ntp_time) {}
uint32_t ssrc;
// Received NTP timestamp in compact representation.
uint32_t received_remote_mid_ntp_time;
// NTP time when the report was received in compact representation.
uint32_t local_receive_mid_ntp_time;
};
struct LastFirStatus {
LastFirStatus(Timestamp now, uint8_t sequence_number)
: request(now), sequence_number(sequence_number) {}
Timestamp request;
uint8_t sequence_number;
};
class RttStats {
public:
RttStats() = default;
RttStats(const RttStats&) = default;
RttStats& operator=(const RttStats&) = default;
void AddRtt(TimeDelta rtt);
TimeDelta last_rtt() const { return last_rtt_; }
TimeDelta average_rtt() const { return sum_rtt_ / num_rtts_; }
private:
TimeDelta last_rtt_ = TimeDelta::Zero();
TimeDelta sum_rtt_ = TimeDelta::Zero();
size_t num_rtts_ = 0;
};
bool ParseCompoundPacket(rtc::ArrayView<const uint8_t> packet,
PacketInformation* packet_information);
void TriggerCallbacksFromRtcpPacket(
const PacketInformation& packet_information);
TmmbrInformation* FindOrCreateTmmbrInfo(uint32_t remote_ssrc)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
// Update TmmbrInformation (if present) is alive.
void UpdateTmmbrRemoteIsAlive(uint32_t remote_ssrc)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
TmmbrInformation* GetTmmbrInformation(uint32_t remote_ssrc)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleSenderReport(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleReceiverReport(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
void HandleReportBlock(const rtcp::ReportBlock& report_block,
PacketInformation* packet_information,
uint32_t remote_ssrc)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleSdes(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleXr(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information,
bool& contains_dlrr,
uint32_t& ssrc)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
void HandleXrReceiveReferenceTime(uint32_t sender_ssrc,
const rtcp::Rrtr& rrtr)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
void HandleXrDlrrReportBlock(uint32_t ssrc, const rtcp::ReceiveTimeInfo& rti)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
void HandleXrTargetBitrate(uint32_t ssrc,
const rtcp::TargetBitrate& target_bitrate,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleNack(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleApp(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleBye(const rtcp::CommonHeader& rtcp_block)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandlePli(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
void HandlePsfbApp(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleTmmbr(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleTmmbn(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleSrReq(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool HandleFir(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
void HandleTransportFeedback(const rtcp::CommonHeader& rtcp_block,
PacketInformation* packet_information)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool RtcpRrTimeoutLocked(Timestamp now)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
bool RtcpRrSequenceNumberTimeoutLocked(Timestamp now)
RTC_EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
Clock* const clock_;
const bool receiver_only_;
ModuleRtpRtcp* const rtp_rtcp_;
// The set of registered local SSRCs.
RegisteredSsrcs registered_ssrcs_;
NetworkLinkRtcpObserver* const network_link_rtcp_observer_;
RtcpIntraFrameObserver* const rtcp_intra_frame_observer_;
RtcpLossNotificationObserver* const rtcp_loss_notification_observer_;
NetworkStateEstimateObserver* const network_state_estimate_observer_;
VideoBitrateAllocationObserver* const bitrate_allocation_observer_;
const TimeDelta report_interval_;
mutable Mutex rtcp_receiver_lock_;
uint32_t remote_ssrc_ RTC_GUARDED_BY(rtcp_receiver_lock_);
// Received sender report.
RtpRtcpInterface::SenderReportStats remote_sender_
RTC_GUARDED_BY(rtcp_receiver_lock_);
// Received RRTR information in ascending receive time order.
std::list<RrtrInformation> received_rrtrs_
RTC_GUARDED_BY(rtcp_receiver_lock_);
// Received RRTR information mapped by remote ssrc.
flat_map<uint32_t, std::list<RrtrInformation>::iterator>
received_rrtrs_ssrc_it_ RTC_GUARDED_BY(rtcp_receiver_lock_);
// Estimated rtt, nullopt when there is no valid estimate.
bool xr_rrtr_status_ RTC_GUARDED_BY(rtcp_receiver_lock_);
absl::optional<TimeDelta> xr_rr_rtt_;
Timestamp oldest_tmmbr_info_ RTC_GUARDED_BY(rtcp_receiver_lock_);
// Mapped by remote ssrc.
flat_map<uint32_t, TmmbrInformation> tmmbr_infos_
RTC_GUARDED_BY(rtcp_receiver_lock_);
// Round-Trip Time per remote sender ssrc.
flat_map<uint32_t, RttStats> rtts_ RTC_GUARDED_BY(rtcp_receiver_lock_);
// Non-sender Round-trip time per remote ssrc.
flat_map<uint32_t, NonSenderRttStats> non_sender_rtts_
RTC_GUARDED_BY(rtcp_receiver_lock_);
// Report blocks per local source ssrc.
flat_map<uint32_t, ReportBlockData> received_report_blocks_
RTC_GUARDED_BY(rtcp_receiver_lock_);
flat_map<uint32_t, LastFirStatus> last_fir_
RTC_GUARDED_BY(rtcp_receiver_lock_);
// The last time we received an RTCP Report block for this module.
Timestamp last_received_rb_ RTC_GUARDED_BY(rtcp_receiver_lock_) =
Timestamp::PlusInfinity();
// The time we last received an RTCP RR telling we have successfully
// delivered RTP packet to the remote side.
Timestamp last_increased_sequence_number_ = Timestamp::PlusInfinity();
RtcpCnameCallback* const cname_callback_;
ReportBlockDataObserver* const report_block_data_observer_;
RtcpPacketTypeCounterObserver* const packet_type_counter_observer_;
RtcpPacketTypeCounter packet_type_counter_;
RtcpNackStats nack_stats_;
size_t num_skipped_packets_;
Timestamp last_skipped_packets_warning_;
};
} // namespace webrtc
#endif // MODULES_RTP_RTCP_SOURCE_RTCP_RECEIVER_H_