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/*
* 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.
*/
#ifndef MODULES_PACING_PACKET_ROUTER_H_
#define MODULES_PACING_PACKET_ROUTER_H_
#include <stddef.h>
#include <stdint.h>
#include <list>
#include <memory>
#include <unordered_map>
#include <utility>
#include <vector>
#include "api/transport/network_types.h"
#include "modules/pacing/pacing_controller.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/rtcp_packet.h"
#include "modules/rtp_rtcp/source/rtp_packet_to_send.h"
#include "rtc_base/constructor_magic.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
class RtpRtcpInterface;
// 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 RemoteBitrateObserver,
public TransportFeedbackSenderInterface,
public PacingController::PacketSender {
public:
PacketRouter();
explicit PacketRouter(uint16_t start_transport_seq);
~PacketRouter() override;
void AddSendRtpModule(RtpRtcpInterface* rtp_module, bool remb_candidate);
void RemoveSendRtpModule(RtpRtcpInterface* rtp_module);
void AddReceiveRtpModule(RtcpFeedbackSenderInterface* rtcp_sender,
bool remb_candidate);
void RemoveReceiveRtpModule(RtcpFeedbackSenderInterface* rtcp_sender);
void SendPacket(std::unique_ptr<RtpPacketToSend> packet,
const PacedPacketInfo& cluster_info) override;
std::vector<std::unique_ptr<RtpPacketToSend>> FetchFec() override;
std::vector<std::unique_ptr<RtpPacketToSend>> GeneratePadding(
DataSize size) override;
uint16_t CurrentTransportSequenceNumber() const;
// 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);
// Sends |packets| in one or more IP packets.
bool SendCombinedRtcpPacket(
std::vector<std::unique_ptr<rtcp::RtcpPacket>> packets) override;
private:
void AddRembModuleCandidate(RtcpFeedbackSenderInterface* candidate_module,
bool media_sender)
RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_mutex_);
void MaybeRemoveRembModuleCandidate(
RtcpFeedbackSenderInterface* candidate_module,
bool media_sender) RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_mutex_);
void UnsetActiveRembModule() RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_mutex_);
void DetermineActiveRembModule() RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_mutex_);
void AddSendRtpModuleToMap(RtpRtcpInterface* rtp_module, uint32_t ssrc)
RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_mutex_);
void RemoveSendRtpModuleFromMap(uint32_t ssrc)
RTC_EXCLUSIVE_LOCKS_REQUIRED(modules_mutex_);
mutable Mutex modules_mutex_;
// Ssrc to RtpRtcpInterface module;
std::unordered_map<uint32_t, RtpRtcpInterface*> send_modules_map_
RTC_GUARDED_BY(modules_mutex_);
std::list<RtpRtcpInterface*> send_modules_list_
RTC_GUARDED_BY(modules_mutex_);
// The last module used to send media.
RtpRtcpInterface* last_send_module_ RTC_GUARDED_BY(modules_mutex_);
// Rtcp modules of the rtp receivers.
std::vector<RtcpFeedbackSenderInterface*> rtcp_feedback_senders_
RTC_GUARDED_BY(modules_mutex_);
// TODO(eladalon): remb_mutex_ only ever held from one function, and it's not
// clear if that function can actually be called from more than one thread.
Mutex remb_mutex_;
// The last time a REMB was sent.
int64_t last_remb_time_ms_ RTC_GUARDED_BY(remb_mutex_);
int64_t last_send_bitrate_bps_ RTC_GUARDED_BY(remb_mutex_);
// The last bitrate update.
int64_t bitrate_bps_ RTC_GUARDED_BY(remb_mutex_);
int64_t max_bitrate_bps_ RTC_GUARDED_BY(remb_mutex_);
// Candidates for the REMB module can be RTP sender/receiver modules, with
// the sender modules taking precedence.
std::vector<RtcpFeedbackSenderInterface*> sender_remb_candidates_
RTC_GUARDED_BY(modules_mutex_);
std::vector<RtcpFeedbackSenderInterface*> receiver_remb_candidates_
RTC_GUARDED_BY(modules_mutex_);
RtcpFeedbackSenderInterface* active_remb_module_
RTC_GUARDED_BY(modules_mutex_);
uint64_t transport_seq_ RTC_GUARDED_BY(modules_mutex_);
// TODO(bugs.webrtc.org/10809): Replace lock with a sequence checker once the
// process thread is gone.
std::vector<std::unique_ptr<RtpPacketToSend>> pending_fec_packets_
RTC_GUARDED_BY(modules_mutex_);
RTC_DISALLOW_COPY_AND_ASSIGN(PacketRouter);
};
} // namespace webrtc
#endif // MODULES_PACING_PACKET_ROUTER_H_
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