mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-26 04:31:37 +08:00
395 lines
13 KiB
C++
395 lines
13 KiB
C++
/*
|
||
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
|
||
*
|
||
* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
|
||
*
|
||
* Use of this source code is governed by MIT license that can be found in the
|
||
* LICENSE file in the root of the source tree. All contributing project authors
|
||
* may be found in the AUTHORS file in the root of the source tree.
|
||
*/
|
||
|
||
#pragma once
|
||
|
||
#include <memory>
|
||
#include <string>
|
||
#include "DtlsTransport.hpp"
|
||
#include "IceServer.hpp"
|
||
#include "SrtpSession.hpp"
|
||
#include "StunPacket.hpp"
|
||
#include "Sdp.h"
|
||
#include "Poller/EventPoller.h"
|
||
#include "Network/Socket.h"
|
||
#include "Rtsp/RtspMediaSourceImp.h"
|
||
#include "Rtcp/RtcpContext.h"
|
||
#include "Rtcp/RtcpFCI.h"
|
||
using namespace toolkit;
|
||
using namespace mediakit;
|
||
|
||
class WebRtcTransport : public RTC::DtlsTransport::Listener, public RTC::IceServer::Listener {
|
||
public:
|
||
using Ptr = std::shared_ptr<WebRtcTransport>;
|
||
WebRtcTransport(const EventPoller::Ptr &poller);
|
||
~WebRtcTransport() override = default;
|
||
|
||
/**
|
||
* 创建对象
|
||
*/
|
||
virtual void onCreate();
|
||
|
||
/**
|
||
* 销毁对象
|
||
*/
|
||
virtual void onDestory();
|
||
|
||
/**
|
||
* 创建webrtc answer sdp
|
||
* @param offer offer sdp
|
||
* @return answer sdp
|
||
*/
|
||
std::string getAnswerSdp(const string &offer);
|
||
|
||
/**
|
||
* socket收到udp数据
|
||
* @param buf 数据指针
|
||
* @param len 数据长度
|
||
* @param tuple 数据来源
|
||
*/
|
||
void inputSockData(char *buf, size_t len, RTC::TransportTuple *tuple);
|
||
|
||
/**
|
||
* 发送rtp
|
||
* @param buf rtcp内容
|
||
* @param len rtcp长度
|
||
* @param flush 是否flush socket
|
||
* @param ctx 用户指针
|
||
*/
|
||
void sendRtpPacket(const char *buf, size_t len, bool flush, void *ctx = nullptr);
|
||
void sendRtcpPacket(const char *buf, size_t len, bool flush, void *ctx = nullptr);
|
||
|
||
const EventPoller::Ptr& getPoller() const;
|
||
|
||
protected:
|
||
//// dtls相关的回调 ////
|
||
void OnDtlsTransportConnecting(const RTC::DtlsTransport *dtlsTransport) override;
|
||
void OnDtlsTransportConnected(const RTC::DtlsTransport *dtlsTransport,
|
||
RTC::SrtpSession::CryptoSuite srtpCryptoSuite,
|
||
uint8_t *srtpLocalKey,
|
||
size_t srtpLocalKeyLen,
|
||
uint8_t *srtpRemoteKey,
|
||
size_t srtpRemoteKeyLen,
|
||
std::string &remoteCert) override;
|
||
|
||
void OnDtlsTransportFailed(const RTC::DtlsTransport *dtlsTransport) override;
|
||
void OnDtlsTransportClosed(const RTC::DtlsTransport *dtlsTransport) override;
|
||
void OnDtlsTransportSendData(const RTC::DtlsTransport *dtlsTransport, const uint8_t *data, size_t len) override;
|
||
void OnDtlsTransportApplicationDataReceived(const RTC::DtlsTransport *dtlsTransport, const uint8_t *data, size_t len) override;
|
||
|
||
protected:
|
||
//// ice相关的回调 ///
|
||
void OnIceServerSendStunPacket(const RTC::IceServer *iceServer, const RTC::StunPacket *packet, RTC::TransportTuple *tuple) override;
|
||
void OnIceServerSelectedTuple(const RTC::IceServer *iceServer, RTC::TransportTuple *tuple) override;
|
||
void OnIceServerConnected(const RTC::IceServer *iceServer) override;
|
||
void OnIceServerCompleted(const RTC::IceServer *iceServer) override;
|
||
void OnIceServerDisconnected(const RTC::IceServer *iceServer) override;
|
||
|
||
protected:
|
||
virtual void onStartWebRTC() = 0;
|
||
virtual void onRtcConfigure(RtcConfigure &configure) const;
|
||
virtual void onCheckSdp(SdpType type, RtcSession &sdp);
|
||
virtual void onSendSockData(const char *buf, size_t len, struct sockaddr_in *dst, bool flush = true) = 0;
|
||
|
||
virtual void onRtp(const char *buf, size_t len) = 0;
|
||
virtual void onRtcp(const char *buf, size_t len) = 0;
|
||
virtual void onShutdown(const SockException &ex) = 0;
|
||
virtual void onBeforeEncryptRtp(const char *buf, size_t &len, void *ctx) = 0;
|
||
virtual void onBeforeEncryptRtcp(const char *buf, size_t &len, void *ctx) = 0;
|
||
|
||
protected:
|
||
const RtcSession& getSdp(SdpType type) const;
|
||
RTC::TransportTuple* getSelectedTuple() const;
|
||
void sendRtcpRemb(uint32_t ssrc, size_t bit_rate);
|
||
void sendRtcpPli(uint32_t ssrc);
|
||
|
||
private:
|
||
void onSendSockData(const char *buf, size_t len, bool flush = true);
|
||
void setRemoteDtlsFingerprint(const RtcSession &remote);
|
||
|
||
private:
|
||
uint8_t _srtp_buf[2000];
|
||
EventPoller::Ptr _poller;
|
||
std::shared_ptr<RTC::IceServer> _ice_server;
|
||
std::shared_ptr<RTC::DtlsTransport> _dtls_transport;
|
||
std::shared_ptr<RTC::SrtpSession> _srtp_session_send;
|
||
std::shared_ptr<RTC::SrtpSession> _srtp_session_recv;
|
||
RtcSession::Ptr _offer_sdp;
|
||
RtcSession::Ptr _answer_sdp;
|
||
};
|
||
|
||
class RtpReceiverImp;
|
||
|
||
class NackList {
|
||
public:
|
||
void push_back(RtpPacket::Ptr rtp) {
|
||
auto seq = rtp->getSeq();
|
||
_nack_cache_seq.emplace_back(seq);
|
||
_nack_cache_pkt.emplace(seq, std::move(rtp));
|
||
while (get_cache_ms() > kMaxNackMS) {
|
||
//需要清除部分nack缓存
|
||
pop_front();
|
||
}
|
||
}
|
||
|
||
template<typename FUNC>
|
||
void for_each_nack(const FCI_NACK &nack, const FUNC &func) {
|
||
auto seq = nack.getPid();
|
||
for (auto bit : nack.getBitArray()) {
|
||
if (bit) {
|
||
//丢包
|
||
RtpPacket::Ptr *ptr = get_rtp(seq);
|
||
if (ptr) {
|
||
func(*ptr);
|
||
}
|
||
}
|
||
++seq;
|
||
}
|
||
}
|
||
|
||
private:
|
||
void pop_front() {
|
||
if (_nack_cache_seq.empty()) {
|
||
return;
|
||
}
|
||
_nack_cache_pkt.erase(_nack_cache_seq.front());
|
||
_nack_cache_seq.pop_front();
|
||
}
|
||
|
||
RtpPacket::Ptr *get_rtp(uint16_t seq) {
|
||
auto it = _nack_cache_pkt.find(seq);
|
||
if (it == _nack_cache_pkt.end()) {
|
||
return nullptr;
|
||
}
|
||
return &it->second;
|
||
}
|
||
|
||
uint32_t get_cache_ms() {
|
||
if (_nack_cache_seq.size() < 2) {
|
||
return 0;
|
||
}
|
||
uint32_t back = _nack_cache_pkt[_nack_cache_seq.back()]->getStampMS();
|
||
uint32_t front = _nack_cache_pkt[_nack_cache_seq.front()]->getStampMS();
|
||
if (back > front) {
|
||
return back - front;
|
||
}
|
||
//很有可能回环了
|
||
return back + (UINT32_MAX - front);
|
||
}
|
||
|
||
private:
|
||
static constexpr uint32_t kMaxNackMS = 10 * 1000;
|
||
deque<uint16_t> _nack_cache_seq;
|
||
unordered_map<uint16_t, RtpPacket::Ptr > _nack_cache_pkt;
|
||
};
|
||
|
||
class NackContext {
|
||
public:
|
||
using onNack = function<void(const FCI_NACK &nack)>;
|
||
|
||
void received(uint16_t seq) {
|
||
if (!_last_max_seq && _seq.empty()) {
|
||
_last_max_seq = seq - 1;
|
||
}
|
||
_seq.emplace(seq);
|
||
auto max_seq = *_seq.rbegin();
|
||
auto min_seq = *_seq.begin();
|
||
auto diff = max_seq - min_seq;
|
||
if (!diff) {
|
||
return;
|
||
}
|
||
|
||
if (diff > UINT32_MAX / 2) {
|
||
//回环
|
||
_seq.clear();
|
||
_last_max_seq = min_seq;
|
||
return;
|
||
}
|
||
|
||
if (_seq.size() == diff + 1 && _last_max_seq + 1 == min_seq) {
|
||
//都是连续的seq，未丢包
|
||
_seq.clear();
|
||
_last_max_seq = max_seq;
|
||
} else {
|
||
//seq不连续，有丢包
|
||
if (min_seq == _last_max_seq + 1) {
|
||
//前面部分seq是连续的，未丢包，移除之
|
||
eraseFrontSeq();
|
||
}
|
||
|
||
//有丢包，丢包从_last_max_seq开始
|
||
if (max_seq - _last_max_seq > FCI_NACK::kBitSize) {
|
||
vector<bool> vec;
|
||
vec.resize(FCI_NACK::kBitSize);
|
||
for (auto i = 0; i < FCI_NACK::kBitSize; ++i) {
|
||
vec[i] = _seq.find(_last_max_seq + i + 2) == _seq.end();
|
||
}
|
||
doNack(FCI_NACK(_last_max_seq + 1, vec));
|
||
_last_max_seq += FCI_NACK::kBitSize + 1;
|
||
if (_last_max_seq >= max_seq) {
|
||
_seq.clear();
|
||
} else {
|
||
auto it = _seq.emplace_hint(_seq.begin(), _last_max_seq);
|
||
_seq.erase(_seq.begin(), it);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void setOnNack(onNack cb) {
|
||
_cb = std::move(cb);
|
||
}
|
||
|
||
private:
|
||
void doNack(const FCI_NACK &nack) {
|
||
if (_cb) {
|
||
_cb(nack);
|
||
}
|
||
}
|
||
|
||
void eraseFrontSeq(){
|
||
//前面部分seq是连续的，未丢包，移除之
|
||
for (auto it = _seq.begin(); it != _seq.end();) {
|
||
if (*it != _last_max_seq + 1) {
|
||
//seq不连续，丢包了
|
||
break;
|
||
}
|
||
_last_max_seq = *it;
|
||
it = _seq.erase(it);
|
||
}
|
||
}
|
||
|
||
private:
|
||
onNack _cb;
|
||
set<uint16_t> _seq;
|
||
uint16_t _last_max_seq = 0;
|
||
};
|
||
|
||
class WebRtcTransportImp : public WebRtcTransport, public MediaSourceEvent, public SockInfo, public std::enable_shared_from_this<WebRtcTransportImp>{
|
||
public:
|
||
using Ptr = std::shared_ptr<WebRtcTransportImp>;
|
||
~WebRtcTransportImp() override;
|
||
|
||
/**
|
||
* 创建WebRTC对象
|
||
* @param poller 改对象需要绑定的线程
|
||
* @return 对象
|
||
*/
|
||
static Ptr create(const EventPoller::Ptr &poller);
|
||
|
||
/**
|
||
* 绑定rtsp媒体源
|
||
* @param src 媒体源
|
||
* @param is_play 是播放还是推流
|
||
*/
|
||
void attach(const RtspMediaSource::Ptr &src, const MediaInfo &info, bool is_play = true);
|
||
|
||
protected:
|
||
void onStartWebRTC() override;
|
||
void onSendSockData(const char *buf, size_t len, struct sockaddr_in *dst, bool flush = true) override;
|
||
void onCheckSdp(SdpType type, RtcSession &sdp) override;
|
||
void onRtcConfigure(RtcConfigure &configure) const override;
|
||
|
||
void onRtp(const char *buf, size_t len) override;
|
||
void onRtp_l(const char *buf, size_t len, bool rtx);
|
||
|
||
void onRtcp(const char *buf, size_t len) override;
|
||
void onBeforeEncryptRtp(const char *buf, size_t &len, void *ctx) override;
|
||
void onBeforeEncryptRtcp(const char *buf, size_t &len, void *ctx) override {};
|
||
|
||
void onShutdown(const SockException &ex) override;
|
||
|
||
///////MediaSourceEvent override///////
|
||
// 关闭
|
||
bool close(MediaSource &sender, bool force) override;
|
||
// 播放总人数
|
||
int totalReaderCount(MediaSource &sender) override;
|
||
// 获取媒体源类型
|
||
MediaOriginType getOriginType(MediaSource &sender) const override;
|
||
// 获取媒体源url或者文件路径
|
||
string getOriginUrl(MediaSource &sender) const override;
|
||
// 获取媒体源客户端相关信息
|
||
std::shared_ptr<SockInfo> getOriginSock(MediaSource &sender) const override;
|
||
|
||
///////SockInfo override///////
|
||
//获取本机ip
|
||
string get_local_ip() override;
|
||
//获取本机端口号
|
||
uint16_t get_local_port() override;
|
||
//获取对方ip
|
||
string get_peer_ip() override;
|
||
//获取对方端口号
|
||
uint16_t get_peer_port() override;
|
||
//获取标识符
|
||
string getIdentifier() const override;
|
||
|
||
private:
|
||
WebRtcTransportImp(const EventPoller::Ptr &poller);
|
||
void onCreate() override;
|
||
void onDestory() override;
|
||
void onSendRtp(const RtpPacket::Ptr &rtp, bool flush, bool rtx = false);
|
||
SdpAttrCandidate::Ptr getIceCandidate() const;
|
||
bool canSendRtp() const;
|
||
bool canRecvRtp() const;
|
||
void changeRtpExtId(const RtpHeader *header, bool is_recv, bool is_rtx = false) const;
|
||
|
||
class RtpPayloadInfo {
|
||
public:
|
||
using Ptr = std::shared_ptr<RtpPayloadInfo>;
|
||
const RtcCodecPlan *plan_rtp;
|
||
const RtcCodecPlan *plan_rtx;
|
||
uint32_t offer_ssrc_rtp = 0;
|
||
uint32_t offer_ssrc_rtx = 0;
|
||
uint32_t answer_ssrc_rtp = 0;
|
||
uint32_t answer_ssrc_rtx = 0;
|
||
const RtcMedia *media;
|
||
NackList nack_list;
|
||
NackContext nack_ctx;
|
||
RtcpContext::Ptr rtcp_context_recv;
|
||
RtcpContext::Ptr rtcp_context_send;
|
||
std::shared_ptr<RtpReceiverImp> receiver;
|
||
};
|
||
|
||
void onSortedRtp(RtpPayloadInfo &info, RtpPacket::Ptr rtp);
|
||
void onSendNack(RtpPayloadInfo &info, const FCI_NACK &nack);
|
||
|
||
private:
|
||
uint16_t _rtx_seq[2] = {0, 0};
|
||
//用掉的总流量
|
||
uint64_t _bytes_usage = 0;
|
||
//媒体相关元数据
|
||
MediaInfo _media_info;
|
||
//保持自我强引用
|
||
Ptr _self;
|
||
//检测超时的定时器
|
||
Timer::Ptr _timer;
|
||
//刷新计时器
|
||
Ticker _alive_ticker;
|
||
//pli rtcp计时器
|
||
Ticker _pli_ticker;
|
||
//复合udp端口，接收一切rtp与rtcp
|
||
Socket::Ptr _socket;
|
||
//推流的rtsp源
|
||
RtspMediaSource::Ptr _push_src;
|
||
//播放的rtsp源
|
||
RtspMediaSource::Ptr _play_src;
|
||
//播放rtsp源的reader对象
|
||
RtspMediaSource::RingType::RingReader::Ptr _reader;
|
||
//根据发送rtp的track类型获取相关信息
|
||
RtpPayloadInfo::Ptr _send_rtp_info[2];
|
||
//根据接收rtp的pt获取相关信息
|
||
unordered_map<uint8_t/*pt*/, std::pair<bool/*is rtx*/,RtpPayloadInfo::Ptr> > _rtp_info_pt;
|
||
//根据rtcp的ssrc获取相关信息
|
||
unordered_map<uint32_t/*ssrc*/, std::pair<bool/*is rtx*/,RtpPayloadInfo::Ptr> > _rtp_info_ssrc;
|
||
//发送rtp时需要修改rtp ext id
|
||
map<RtpExtType, uint8_t> _rtp_ext_type_to_id;
|
||
//接收rtp时需要修改rtp ext id
|
||
unordered_map<uint8_t, RtpExtType> _rtp_ext_id_to_type;
|
||
}; |