blob: 309d4382df7b1d770a3d5cfa825ad48b01d90a46 [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 <stddef.h>
#include <stdint.h>
#include <list>
#include <memory>
#include <unordered_map>
#include <vector>
#include "api/transport/network_types.h"
#include "modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/rtp_packet_to_send.h"
#include "rtc_base/constructor_magic.h"
#include "rtc_base/critical_section.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
class RtpRtcp;
namespace rtcp {
class TransportFeedback;
} // namespace rtcp
// PacketRouter keeps track of rtp send modules to support the pacer.
// In addition, it handles feedback messages, which are sent on a send
// module if possible (sender report), otherwise on receive module
// (receiver report). For the latter case, we also keep track of the
// receive modules.
class PacketRouter : public TransportSequenceNumberAllocator,
public RemoteBitrateObserver,
public TransportFeedbackSenderInterface {
~PacketRouter() override;
void AddSendRtpModule(RtpRtcp* rtp_module, bool remb_candidate);
void RemoveSendRtpModule(RtpRtcp* rtp_module);
void AddReceiveRtpModule(RtcpFeedbackSenderInterface* rtcp_sender,
bool remb_candidate);
void RemoveReceiveRtpModule(RtcpFeedbackSenderInterface* rtcp_sender);
virtual RtpPacketSendResult TimeToSendPacket(
uint32_t ssrc,
uint16_t sequence_number,
int64_t capture_timestamp,
bool retransmission,
const PacedPacketInfo& packet_info);
virtual void SendPacket(std::unique_ptr<RtpPacketToSend> packet,
const PacedPacketInfo& cluster_info);
virtual size_t TimeToSendPadding(size_t bytes,
const PacedPacketInfo& packet_info);
virtual std::vector<std::unique_ptr<RtpPacketToSend>> GeneratePadding(
size_t target_size_bytes);
void SetTransportWideSequenceNumber(uint16_t sequence_number);
uint16_t AllocateSequenceNumber() override;
// Called every time there is a new bitrate estimate for a receive channel
// group. This call will trigger a new RTCP REMB packet if the bitrate
// estimate has decreased or if no RTCP REMB packet has been sent for
// a certain time interval.
// Implements RtpReceiveBitrateUpdate.
void OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
uint32_t bitrate_bps) override;
// Ensures remote party notified of the receive bitrate limit no larger than
// |bitrate_bps|.
void SetMaxDesiredReceiveBitrate(int64_t bitrate_bps);
// Send REMB feedback.
bool SendRemb(int64_t bitrate_bps, const std::vector<uint32_t>& ssrcs);
// Send transport feedback packet to send-side.
bool SendTransportFeedback(rtcp::TransportFeedback* packet) override;
RtpRtcp* FindRtpModule(uint32_t ssrc)
void AddRembModuleCandidate(RtcpFeedbackSenderInterface* candidate_module,
bool media_sender)
void MaybeRemoveRembModuleCandidate(
RtcpFeedbackSenderInterface* candidate_module,
bool media_sender) RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_crit_);
void UnsetActiveRembModule() RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_crit_);
void DetermineActiveRembModule() RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_crit_);
bool TrySendPacket(RtpPacketToSend* packet,
const PacedPacketInfo& cluster_info,
RtpRtcp* rtp_module)
rtc::CriticalSection modules_crit_;
// Rtp and Rtcp modules of the rtp senders.
std::list<RtpRtcp*> rtp_send_modules_ RTC_GUARDED_BY(modules_crit_);
// Ssrc to RtpRtcp module cache.
std::unordered_map<uint32_t, RtpRtcp*> rtp_module_cache_map_
// The last module used to send media.
RtpRtcp* last_send_module_ RTC_GUARDED_BY(modules_crit_);
// Rtcp modules of the rtp receivers.
std::vector<RtcpFeedbackSenderInterface*> rtcp_feedback_senders_
// TODO(eladalon): remb_crit_ only ever held from one function, and it's not
// clear if that function can actually be called from more than one thread.
rtc::CriticalSection remb_crit_;
// The last time a REMB was sent.
int64_t last_remb_time_ms_ RTC_GUARDED_BY(remb_crit_);
int64_t last_send_bitrate_bps_ RTC_GUARDED_BY(remb_crit_);
// The last bitrate update.
int64_t bitrate_bps_ RTC_GUARDED_BY(remb_crit_);
int64_t max_bitrate_bps_ RTC_GUARDED_BY(remb_crit_);
// Candidates for the REMB module can be RTP sender/receiver modules, with
// the sender modules taking precedence.
std::vector<RtcpFeedbackSenderInterface*> sender_remb_candidates_
std::vector<RtcpFeedbackSenderInterface*> receiver_remb_candidates_
RtcpFeedbackSenderInterface* active_remb_module_
volatile int transport_seq_;
} // namespace webrtc