RtspPlayer.cpp

/*
 * MIT License
 *
 * Copyright (c) 2016-2019 xiongziliang <771730766@qq.com>
 * Copyright (c) 2018 huohuo <913481084@qq.com>
 *
 * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <set>
#include <cmath>
#include <stdarg.h>
#include <algorithm>
#include <iomanip>

#include "Common/config.h"
#include "RtspPlayer.h"
#include "Util/MD5.h"
#include "Util/mini.h"
#include "Util/util.h"
#include "Util/base64.h"
#include "Network/sockutil.h"
using namespace toolkit;
using namespace mediakit::Client;

namespace mediakit {

enum PlayType {
	type_play = 0,
	type_pause,
	type_seek
};

RtspPlayer::RtspPlayer(const EventPoller::Ptr &poller) : TcpClient(poller){
	RtpReceiver::setPoolSize(64);
}
RtspPlayer::~RtspPlayer(void) {
    DebugL << endl;
}
void RtspPlayer::teardown(){
	if (alive()) {
		sendRtspRequest("TEARDOWN" ,_strContentBase);
		shutdown(SockException(Err_shutdown,"teardown"));
	}

	_rtspMd5Nonce.clear();
	_rtspRealm.clear();
	_aTrackInfo.clear();
    _strSession.clear();
    _strContentBase.clear();
	RtpReceiver::clear();

    CLEAR_ARR(_apRtpSock);
    CLEAR_ARR(_apRtcpSock);
    CLEAR_ARR(_aui16FirstSeq)
    CLEAR_ARR(_aui64RtpRecv)
    CLEAR_ARR(_aui64RtpRecv)
    CLEAR_ARR(_aui16NowSeq)

	_pPlayTimer.reset();
    _pRtpTimer.reset();
	_uiCseq = 1;
	_onHandshake = nullptr;
}

void RtspPlayer::play(const string &strUrl){
	Rtsp::eRtpType eType = (Rtsp::eRtpType)(int)(*this)[kRtpType];
	auto schema = FindField(strUrl.data(), nullptr,"://");
	bool isSSL = strcasecmp(schema.data(),"rtsps") == 0;
	//查找"://"与"/"之间的字符串，用于提取用户名密码
	auto middle_url = FindField(strUrl.data(),"://","/");
	if(middle_url.empty()){
		middle_url = FindField(strUrl.data(),"://", nullptr);
	}
    auto pos = middle_url.rfind('@');
	if(pos == string::npos){
        //并没有用户名密码
        play(isSSL,strUrl,"","",eType);
        return;
	}

    //包含用户名密码
    auto user_pwd = middle_url.substr(0,pos);
	auto suffix = strUrl.substr(schema.size() + 3 + pos + 1);
	auto url = StrPrinter << "rtsp://" << suffix << endl;
	if(user_pwd.find(":") == string::npos){
		play(isSSL,url,user_pwd,"",eType);
		return;
	}
	auto user = FindField(user_pwd.data(),nullptr,":");
	auto pwd = FindField(user_pwd.data(),":",nullptr);
	play(isSSL,url,user,pwd,eType);
}

void RtspPlayer::play(bool isSSL,const string &strUrl, const string &strUser, const string &strPwd,  Rtsp::eRtpType eType ) {
	DebugL  << strUrl << " "
			<< (strUser.size() ? strUser : "null") << " "
			<< (strPwd.size() ? strPwd:"null") << " "
			<< eType;
	teardown();

	if(strUser.size()){
        (*this)[kRtspUser] = strUser;
    }
    if(strPwd.size()){
        (*this)[kRtspPwd] = strPwd;
		(*this)[kRtspPwdIsMD5] = false;
    }

	_eType = eType;

	auto ip = FindField(strUrl.data(), "://", "/");
	if (ip.empty()) {
		ip = split(FindField(strUrl.data(), "://", NULL),"?")[0];
	}
	auto port = atoi(FindField(ip.data(), ":", NULL).data());
	if (port <= 0) {
		//rtsp 默认端口554
		port = isSSL ? 322 : 554;
	} else {
		//服务器域名
		ip = FindField(ip.data(), NULL, ":");
	}

	if(ip.empty()){
		onPlayResult_l(SockException(Err_other,StrPrinter << "illegal rtsp url:" << strUrl),false);
		return;
	}

	_strUrl = strUrl;

	weak_ptr<RtspPlayer> weakSelf = dynamic_pointer_cast<RtspPlayer>(shared_from_this());
	float playTimeOutSec = (*this)[kTimeoutMS].as<int>() / 1000.0;
	_pPlayTimer.reset( new Timer(playTimeOutSec,  [weakSelf]() {
		auto strongSelf=weakSelf.lock();
		if(!strongSelf) {
			return false;
		}
		strongSelf->onPlayResult_l(SockException(Err_timeout,"play rtsp timeout"),false);
		return false;
	},getPoller()));

	if(!(*this)[kNetAdapter].empty()){
		setNetAdapter((*this)[kNetAdapter]);
	}
	startConnect(ip, port , playTimeOutSec);
}
void RtspPlayer::onConnect(const SockException &err){
	if(err.getErrCode() != Err_success) {
		onPlayResult_l(err,false);
		return;
	}

	sendDescribe();
}

void RtspPlayer::onRecv(const Buffer::Ptr& pBuf) {
    input(pBuf->data(),pBuf->size());
}
void RtspPlayer::onErr(const SockException &ex) {
	//定时器_pPlayTimer为空后表明握手结束了
	onPlayResult_l(ex,!_pPlayTimer);
}
// from live555
bool RtspPlayer::handleAuthenticationFailure(const string &paramsStr) {
    if(!_rtspRealm.empty()){
        //已经认证过了
        return false;
    }

    char *realm = new char[paramsStr.size()];
    char *nonce = new char[paramsStr.size()];
    char *stale = new char[paramsStr.size()];
    onceToken token(nullptr,[&](){
        delete[] realm;
        delete[] nonce;
        delete[] stale;
    });

    if (sscanf(paramsStr.data(), "Digest realm=\"%[^\"]\", nonce=\"%[^\"]\", stale=%[a-zA-Z]", realm, nonce, stale) == 3) {
        _rtspRealm = (const char *)realm;
        _rtspMd5Nonce = (const char *)nonce;
        return true;
    }
    if (sscanf(paramsStr.data(), "Digest realm=\"%[^\"]\", nonce=\"%[^\"]\"", realm, nonce) == 2) {
        _rtspRealm = (const char *)realm;
        _rtspMd5Nonce = (const char *)nonce;
        return true;
    }
    if (sscanf(paramsStr.data(), "Basic realm=\"%[^\"]\"", realm) == 1) {
        _rtspRealm = (const char *)realm;
        return true;
    }
    return false;
}
void RtspPlayer::handleResDESCRIBE(const Parser& parser) {
	string authInfo = parser["WWW-Authenticate"];
	//发送DESCRIBE命令后的回复
	if ((parser.Url() == "401") && handleAuthenticationFailure(authInfo)) {
		sendDescribe();
		return;
	}
	if(parser.Url() == "302" || parser.Url() == "301"){
		auto newUrl = parser["Location"];
		if(newUrl.empty()){
			throw std::runtime_error("未找到Location字段(跳转url)");
		}
		play(newUrl);
		return;
	}
	if (parser.Url() != "200") {
		throw std::runtime_error(
		StrPrinter << "DESCRIBE:" << parser.Url() << " " << parser.Tail() << endl);
	}
	_strContentBase = parser["Content-Base"];

    if(_strContentBase.empty()){
        _strContentBase = _strUrl;
    }
    if (_strContentBase.back() == '/') {
        _strContentBase.pop_back();
    }

	SdpParser sdpParser(parser.Content());
	//解析sdp
	_aTrackInfo = sdpParser.getAvailableTrack();
	auto title = sdpParser.getTrack(TrackTitle);
	bool isPlayback = false;
	if(title && title->_duration ){
        isPlayback = true;
	}

    for(auto &stamp : _stamp){
        stamp.setPlayBack(isPlayback);
        stamp.setRelativeStamp(0);
    }

	if (_aTrackInfo.empty()) {
		throw std::runtime_error("无有效的Sdp Track");
	}
	if (!onCheckSDP(sdpParser.toString())) {
		throw std::runtime_error("onCheckSDP faied");
	}

	sendSetup(0);
}

//有必要的情况下创建udp端口
void RtspPlayer::createUdpSockIfNecessary(int track_idx){
	auto &rtpSockRef = _apRtpSock[track_idx];
	auto &rtcpSockRef = _apRtcpSock[track_idx];
	if(!rtpSockRef){
		rtpSockRef.reset(new Socket(getPoller()));
		//rtp随机端口
		if (!rtpSockRef->bindUdpSock(0, get_local_ip().data())) {
			rtpSockRef.reset();
			throw std::runtime_error("open rtp sock failed");
		}
	}

	if(!rtcpSockRef){
		rtcpSockRef.reset(new Socket(getPoller()));
		//rtcp端口为rtp端口+1，目的是为了兼容某些服务器，其实更推荐随机端口
		if (!rtcpSockRef->bindUdpSock(rtpSockRef->get_local_port() + 1, get_local_ip().data())) {
			rtcpSockRef.reset();
			throw std::runtime_error("open rtcp sock failed");
		}
	}

	if(rtpSockRef->get_local_port() % 2 != 0){
		//如果rtp端口不是偶数，那么与rtcp端口互换，目的是兼容一些要求严格的服务器
		Socket::Ptr tmp = rtpSockRef;
		rtpSockRef = rtcpSockRef;
		rtcpSockRef = tmp;
	}
}


//发送SETUP命令
void RtspPlayer::sendSetup(unsigned int trackIndex) {
    _onHandshake = std::bind(&RtspPlayer::handleResSETUP,this, placeholders::_1,trackIndex);
    auto &track = _aTrackInfo[trackIndex];
	auto baseUrl = _strContentBase + "/" + track->_control_surffix;
	switch (_eType) {
		case Rtsp::RTP_TCP: {
			sendRtspRequest("SETUP",baseUrl,{"Transport",StrPrinter << "RTP/AVP/TCP;unicast;interleaved=" << track->_type * 2 << "-" << track->_type * 2 + 1});
		}
			break;
		case Rtsp::RTP_MULTICAST: {
			sendRtspRequest("SETUP",baseUrl,{"Transport","Transport: RTP/AVP;multicast"});
		}
			break;
		case Rtsp::RTP_UDP: {
			createUdpSockIfNecessary(trackIndex);
			sendRtspRequest("SETUP",baseUrl,{"Transport",
                                    StrPrinter << "RTP/AVP;unicast;client_port="
                                    << _apRtpSock[trackIndex]->get_local_port() << "-"
                                    << _apRtcpSock[trackIndex]->get_local_port()});
		}
			break;
		default:
			break;
	}
}

void RtspPlayer::handleResSETUP(const Parser &parser, unsigned int uiTrackIndex) {
	if (parser.Url() != "200") {
		throw std::runtime_error(
		StrPrinter << "SETUP:" << parser.Url() << " " << parser.Tail() << endl);
	}
	if (uiTrackIndex == 0) {
		_strSession = parser["Session"];
        _strSession.append(";");
        _strSession = FindField(_strSession.data(), nullptr, ";");
	}

	auto strTransport = parser["Transport"];
	if(strTransport.find("TCP") != string::npos || strTransport.find("interleaved") != string::npos){
		_eType = Rtsp::RTP_TCP;
	}else if(strTransport.find("multicast") != string::npos){
		_eType = Rtsp::RTP_MULTICAST;
	}else{
		_eType = Rtsp::RTP_UDP;
	}

	RtspSplitter::enableRecvRtp(_eType == Rtsp::RTP_TCP);

	if(_eType == Rtsp::RTP_TCP)  {
		string interleaved = FindField( FindField((strTransport + ";").data(), "interleaved=", ";").data(), NULL, "-");
		_aTrackInfo[uiTrackIndex]->_interleaved = atoi(interleaved.data());
	}else{
		const char *strPos = (_eType == Rtsp::RTP_MULTICAST ? "port=" : "server_port=") ;
		auto port_str = FindField((strTransport + ";").data(), strPos, ";");
		uint16_t rtp_port = atoi(FindField(port_str.data(), NULL, "-").data());
        uint16_t rtcp_port = atoi(FindField(port_str.data(), "-",NULL).data());
        auto &pRtpSockRef = _apRtpSock[uiTrackIndex];
        auto &pRtcpSockRef = _apRtcpSock[uiTrackIndex];

		if (_eType == Rtsp::RTP_MULTICAST) {
		    //udp组播
			auto multiAddr = FindField((strTransport + ";").data(), "destination=", ";");
            pRtpSockRef.reset(new Socket(getPoller()));
			if (!pRtpSockRef->bindUdpSock(rtp_port, multiAddr.data())) {
				pRtpSockRef.reset();
				throw std::runtime_error("open udp sock err");
			}
			auto fd = pRtpSockRef->rawFD();
			if (-1 == SockUtil::joinMultiAddrFilter(fd, multiAddr.data(), get_peer_ip().data(),get_local_ip().data())) {
				SockUtil::joinMultiAddr(fd, multiAddr.data(),get_local_ip().data());
			}
		} else {
			createUdpSockIfNecessary(uiTrackIndex);
			//udp单播
			struct sockaddr_in rtpto;
			rtpto.sin_port = ntohs(rtp_port);
			rtpto.sin_family = AF_INET;
			rtpto.sin_addr.s_addr = inet_addr(get_peer_ip().data());
			pRtpSockRef->setSendPeerAddr((struct sockaddr *)&(rtpto));
			//发送rtp打洞包
			pRtpSockRef->send("\xce\xfa\xed\xfe", 4);

			//设置rtcp发送目标，为后续发送rtcp做准备
            rtpto.sin_port = ntohs(rtcp_port);
            rtpto.sin_family = AF_INET;
            rtpto.sin_addr.s_addr = inet_addr(get_peer_ip().data());
            pRtcpSockRef->setSendPeerAddr((struct sockaddr *)&(rtpto));
		}

        auto srcIP = inet_addr(get_peer_ip().data());
        weak_ptr<RtspPlayer> weakSelf = dynamic_pointer_cast<RtspPlayer>(shared_from_this());
        //设置rtp over udp接收回调处理函数
        pRtpSockRef->setOnRead([srcIP, uiTrackIndex, weakSelf](const Buffer::Ptr &buf, struct sockaddr *addr , int addr_len) {
            auto strongSelf = weakSelf.lock();
            if (!strongSelf) {
                return;
            }
            if (((struct sockaddr_in *) addr)->sin_addr.s_addr != srcIP) {
                WarnL << "收到其他地址的rtp数据:" << inet_ntoa(((struct sockaddr_in *) addr)->sin_addr);
                return;
            }
            strongSelf->handleOneRtp(uiTrackIndex, strongSelf->_aTrackInfo[uiTrackIndex], (unsigned char *) buf->data(), buf->size());
        });

        if(pRtcpSockRef) {
            //设置rtcp over udp接收回调处理函数
            pRtcpSockRef->setOnRead([srcIP, uiTrackIndex, weakSelf](const Buffer::Ptr &buf, struct sockaddr *addr , int addr_len) {
                auto strongSelf = weakSelf.lock();
                if (!strongSelf) {
                    return;
                }
                if (((struct sockaddr_in *) addr)->sin_addr.s_addr != srcIP) {
                    WarnL << "收到其他地址的rtcp数据:" << inet_ntoa(((struct sockaddr_in *) addr)->sin_addr);
                    return;
                }
                strongSelf->onRtcpPacket(uiTrackIndex, strongSelf->_aTrackInfo[uiTrackIndex], (unsigned char *) buf->data(), buf->size());
            });
        }
	}

	if (uiTrackIndex < _aTrackInfo.size() - 1) {
		//需要继续发送SETUP命令
		sendSetup(uiTrackIndex + 1);
		return;
	}
	//所有setup命令发送完毕
	//发送play命令
    sendPause(type_play, 0);
}

void RtspPlayer::sendDescribe() {
	//发送DESCRIBE命令后处理函数:handleResDESCRIBE
	_onHandshake = std::bind(&RtspPlayer::handleResDESCRIBE,this, placeholders::_1);
	sendRtspRequest("DESCRIBE",_strUrl,{"Accept","application/sdp"});
}

void RtspPlayer::sendPause(int type , uint32_t seekMS){
	_onHandshake = std::bind(&RtspPlayer::handleResPAUSE,this, placeholders::_1,type);
	//开启或暂停rtsp
	switch (type){
		case type_pause:
			sendRtspRequest("PAUSE", _strContentBase);
			break;
		case type_play:
			sendRtspRequest("PLAY", _strContentBase);
			break;
		case type_seek:
			sendRtspRequest("PLAY", _strContentBase, {"Range",StrPrinter << "npt=" << setiosflags(ios::fixed) << setprecision(2) << seekMS / 1000.0 << "-"});
			break;
		default:
			WarnL << "unknown type : " << type;
			_onHandshake = nullptr;
			break;
	}
}
void RtspPlayer::pause(bool bPause) {
    sendPause(bPause ? type_pause : type_seek, getProgressMilliSecond());
}

void RtspPlayer::handleResPAUSE(const Parser& parser,int type) {
	if (parser.Url() != "200") {
		switch (type) {
			case type_pause:
				WarnL << "Pause failed:" << parser.Url() << " " << parser.Tail() << endl;
				break;
			case type_play:
				WarnL << "Play failed:" << parser.Url() << " " << parser.Tail() << endl;
				break;
			case type_seek:
				WarnL << "Seek failed:" << parser.Url() << " " << parser.Tail() << endl;
				break;
		}
		return;
	}

	if (type == type_pause) {
		//暂停成功！
		_pRtpTimer.reset();
		return;
	}

	//play或seek成功
	uint32_t iSeekTo = 0;
	//修正时间轴
	auto strRange = parser["Range"];
	if (strRange.size()) {
		auto strStart = FindField(strRange.data(), "npt=", "-");
		if (strStart == "now") {
			strStart = "0";
		}
		iSeekTo = 1000 * atof(strStart.data());
		DebugL << "seekTo(ms):" << iSeekTo;
	}
	//设置相对时间戳
	_stamp[0].setRelativeStamp(iSeekTo);
	_stamp[1].setRelativeStamp(iSeekTo);
	onPlayResult_l(SockException(Err_success, type == type_seek ? "resum rtsp success" : "rtsp play success"), type == type_seek);
}

void RtspPlayer::onWholeRtspPacket(Parser &parser) {
    try {
		decltype(_onHandshake) fun;
		_onHandshake.swap(fun);
        if(fun){
            fun(parser);
        }
        parser.Clear();
    } catch (std::exception &err) {
		//定时器_pPlayTimer为空后表明握手结束了
		onPlayResult_l(SockException(Err_other, err.what()),!_pPlayTimer);
    }
}

void RtspPlayer::onRtpPacket(const char *data, uint64_t len) {
    int trackIdx = -1;
    uint8_t interleaved = data[1];
    if(interleaved %2 == 0){
        trackIdx = getTrackIndexByInterleaved(interleaved);
        if (trackIdx != -1) {
            handleOneRtp(trackIdx,_aTrackInfo[trackIdx],(unsigned char *)data + 4, len - 4);
        }
    }else{
        trackIdx = getTrackIndexByInterleaved(interleaved - 1);
        if (trackIdx != -1) {
            onRtcpPacket(trackIdx, _aTrackInfo[trackIdx], (unsigned char *) data + 4, len - 4);
        }
    }
}

void RtspPlayer::onRtcpPacket(int iTrackidx, SdpTrack::Ptr &track, unsigned char *pucData, unsigned int uiLen){

}


#if 0
//改代码提取自FFmpeg，参考之
// Receiver Report
    avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
    avio_w8(pb, RTCP_RR);
    avio_wb16(pb, 7); /* length in words - 1 */
    // our own SSRC: we use the server's SSRC + 1 to avoid conflicts
    avio_wb32(pb, s->ssrc + 1);
    avio_wb32(pb, s->ssrc); // server SSRC
    // some placeholders we should really fill...
    // RFC 1889/p64
    extended_max          = stats->cycles + stats->max_seq;
    expected              = extended_max - stats->base_seq;
    lost                  = expected - stats->received;
    lost                  = FFMIN(lost, 0xffffff); // clamp it since it's only 24 bits...
    expected_interval     = expected - stats->expected_prior;
    stats->expected_prior = expected;
    received_interval     = stats->received - stats->received_prior;
    stats->received_prior = stats->received;
    lost_interval         = expected_interval - received_interval;
    if (expected_interval == 0 || lost_interval <= 0)
        fraction = 0;
    else
        fraction = (lost_interval << 8) / expected_interval;

    fraction = (fraction << 24) | lost;

    avio_wb32(pb, fraction); /* 8 bits of fraction, 24 bits of total packets lost */
    avio_wb32(pb, extended_max); /* max sequence received */
    avio_wb32(pb, stats->jitter >> 4); /* jitter */

    if (s->last_rtcp_ntp_time == AV_NOPTS_VALUE) {
        avio_wb32(pb, 0); /* last SR timestamp */
        avio_wb32(pb, 0); /* delay since last SR */
    } else {
        uint32_t middle_32_bits   = s->last_rtcp_ntp_time >> 16; // this is valid, right? do we need to handle 64 bit values special?
        uint32_t delay_since_last = av_rescale(av_gettime_relative() - s->last_rtcp_reception_time,
                                               65536, AV_TIME_BASE);

        avio_wb32(pb, middle_32_bits); /* last SR timestamp */
        avio_wb32(pb, delay_since_last); /* delay since last SR */
    }

    // CNAME
    avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
    avio_w8(pb, RTCP_SDES);
    len = strlen(s->hostname);
    avio_wb16(pb, (7 + len + 3) / 4); /* length in words - 1 */
    avio_wb32(pb, s->ssrc + 1);
    avio_w8(pb, 0x01);
    avio_w8(pb, len);
    avio_write(pb, s->hostname, len);
    avio_w8(pb, 0); /* END */
    // padding
    for (len = (7 + len) % 4; len % 4; len++)
        avio_w8(pb, 0);
#endif

void RtspPlayer::sendReceiverReport(bool overTcp,int iTrackIndex){
    static const char s_cname[] = "ZLMediaKitRtsp";
    uint8_t aui8Rtcp[4 + 32 + 10 + sizeof(s_cname) + 1] = {0};
    uint8_t *pui8Rtcp_RR = aui8Rtcp + 4, *pui8Rtcp_SDES = pui8Rtcp_RR + 32;
    auto &track = _aTrackInfo[iTrackIndex];
    auto &counter = _aRtcpCnt[iTrackIndex];

    aui8Rtcp[0] = '$';
    aui8Rtcp[1] = track->_interleaved + 1;
    aui8Rtcp[2] = (sizeof(aui8Rtcp) - 4) >>  8;
    aui8Rtcp[3] = (sizeof(aui8Rtcp) - 4) & 0xFF;

    pui8Rtcp_RR[0] = 0x81;/* 1 report block */
    pui8Rtcp_RR[1] = 0xC9;//RTCP_RR
    pui8Rtcp_RR[2] = 0x00;
    pui8Rtcp_RR[3] = 0x07;/* length in words - 1 */

    uint32_t ssrc=htonl(track->_ssrc + 1);
    // our own SSRC: we use the server's SSRC + 1 to avoid conflicts
    memcpy(&pui8Rtcp_RR[4], &ssrc, 4);
    ssrc=htonl(track->_ssrc);
    // server SSRC
    memcpy(&pui8Rtcp_RR[8], &ssrc, 4);

    //FIXME: 8 bits of fraction, 24 bits of total packets lost
    pui8Rtcp_RR[12] = 0x00;
    pui8Rtcp_RR[13] = 0x00;
    pui8Rtcp_RR[14] = 0x00;
    pui8Rtcp_RR[15] = 0x00;

    //FIXME: max sequence received
    int cycleCount = getCycleCount(iTrackIndex);
    pui8Rtcp_RR[16] = cycleCount >> 8;
    pui8Rtcp_RR[17] = cycleCount & 0xFF;
    pui8Rtcp_RR[18] = counter.pktCnt >> 8;
    pui8Rtcp_RR[19] = counter.pktCnt & 0xFF;

    uint32_t  jitter = htonl(getJitterSize(iTrackIndex));
    //FIXME: jitter
    memcpy(pui8Rtcp_RR + 20, &jitter , 4);
    /* last SR timestamp */
    memcpy(pui8Rtcp_RR + 24, &counter.lastTimeStamp, 4);
    uint32_t msInc = htonl(ntohl(counter.timeStamp) - ntohl(counter.lastTimeStamp));
    /* delay since last SR */
    memcpy(pui8Rtcp_RR + 28, &msInc, 4);

    // CNAME
    pui8Rtcp_SDES[0] = 0x81;
    pui8Rtcp_SDES[1] = 0xCA;
    pui8Rtcp_SDES[2] = 0x00;
    pui8Rtcp_SDES[3] = 0x06;

    memcpy(&pui8Rtcp_SDES[4], &ssrc, 4);

    pui8Rtcp_SDES[8] = 0x01;
    pui8Rtcp_SDES[9] = 0x0f;
    memcpy(&pui8Rtcp_SDES[10], s_cname, sizeof(s_cname));
    pui8Rtcp_SDES[10 + sizeof(s_cname)] = 0x00;

    if(overTcp){
        send(obtainBuffer((char *) aui8Rtcp, sizeof(aui8Rtcp)));
    }else if(_apRtcpSock[iTrackIndex]) {
        _apRtcpSock[iTrackIndex]->send((char *) aui8Rtcp + 4, sizeof(aui8Rtcp) - 4);
    }
}


void RtspPlayer::onRtpSorted(const RtpPacket::Ptr &rtppt, int trackidx){
	//统计丢包率
	if (_aui16FirstSeq[trackidx] == 0 || rtppt->sequence < _aui16FirstSeq[trackidx]) {
		_aui16FirstSeq[trackidx] = rtppt->sequence;
		_aui64RtpRecv[trackidx] = 0;
	}
	_aui64RtpRecv[trackidx] ++;
	_aui16NowSeq[trackidx] = rtppt->sequence;

	//计算相对时间戳
	int64_t dts_out;
	_stamp[trackidx].revise(rtppt->timeStamp,rtppt->timeStamp,dts_out,dts_out);
    rtppt->timeStamp = dts_out;
	onRecvRTP_l(rtppt,_aTrackInfo[trackidx]);
}
float RtspPlayer::getPacketLossRate(TrackType type) const{
	int iTrackIdx = getTrackIndexByTrackType(type);
	if(iTrackIdx == -1){
		uint64_t totalRecv = 0;
		uint64_t totalSend = 0;
		for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
			totalRecv += _aui64RtpRecv[i];
			totalSend += (_aui16NowSeq[i] - _aui16FirstSeq[i] + 1);
		}
		if(totalSend == 0){
			return 0;
		}
		return 1.0 - (double)totalRecv / totalSend;
	}

	if(_aui16NowSeq[iTrackIdx] - _aui16FirstSeq[iTrackIdx] + 1 == 0){
		return 0;
	}
	return 1.0 - (double)_aui64RtpRecv[iTrackIdx] / (_aui16NowSeq[iTrackIdx] - _aui16FirstSeq[iTrackIdx] + 1);
}

uint32_t RtspPlayer::getProgressMilliSecond() const{
    return MAX(_stamp[0].getRelativeStamp(),_stamp[1].getRelativeStamp());
}
void RtspPlayer::seekToMilliSecond(uint32_t ms) {
    sendPause(type_seek,ms);
}

void RtspPlayer::sendRtspRequest(const string &cmd, const string &url, const std::initializer_list<string> &header) {
	string key;
	StrCaseMap header_map;
	int i = 0;
	for(auto &val : header){
		if(++i % 2 == 0){
			header_map.emplace(key,val);
		}else{
			key = val;
		}
	}
	sendRtspRequest(cmd,url,header_map);
}
void RtspPlayer::sendRtspRequest(const string &cmd, const string &url,const StrCaseMap &header_const) {
	auto header = header_const;
	header.emplace("CSeq",StrPrinter << _uiCseq++);
	header.emplace("User-Agent",SERVER_NAME "(build in " __DATE__ " " __TIME__ ")");

	if(!_strSession.empty()){
		header.emplace("Session",_strSession);
	}

	if(!_rtspRealm.empty() && !(*this)[kRtspUser].empty()){
		if(!_rtspMd5Nonce.empty()){
			//MD5认证
			/*
			response计算方法如下：
			RTSP客户端应该使用username + password并计算response如下:
			(1)当password为MD5编码,则
				response = md5( password:nonce:md5(public_method:url)  );
			(2)当password为ANSI字符串,则
				response= md5( md5(username:realm:password):nonce:md5(public_method:url) );
			 */
			string encrypted_pwd = (*this)[kRtspPwd];
			if(!(*this)[kRtspPwdIsMD5].as<bool>()){
				encrypted_pwd = MD5((*this)[kRtspUser]+ ":" + _rtspRealm + ":" + encrypted_pwd).hexdigest();
			}
			auto response = MD5( encrypted_pwd + ":" + _rtspMd5Nonce  + ":" + MD5(cmd + ":" + url).hexdigest()).hexdigest();
			_StrPrinter printer;
			printer << "Digest ";
			printer << "username=\"" << (*this)[kRtspUser] << "\", ";
			printer << "realm=\"" << _rtspRealm << "\", ";
			printer << "nonce=\"" << _rtspMd5Nonce << "\", ";
			printer << "uri=\"" << url << "\", ";
			printer << "response=\"" << response << "\"";
			header.emplace("Authorization",printer);
		}else if(!(*this)[kRtspPwdIsMD5].as<bool>()){
			//base64认证
			string authStr = StrPrinter << (*this)[kRtspUser] << ":" << (*this)[kRtspPwd];
			char authStrBase64[1024] = {0};
			av_base64_encode(authStrBase64,sizeof(authStrBase64),(uint8_t *)authStr.data(),authStr.size());
			header.emplace("Authorization",StrPrinter << "Basic " << authStrBase64 );
		}
	}

	_StrPrinter printer;
	printer << cmd << " " << url << " RTSP/1.0\r\n";
	for (auto &pr : header){
		printer << pr.first << ": " << pr.second << "\r\n";
	}
	send(printer << "\r\n");
}

void RtspPlayer::onRecvRTP_l(const RtpPacket::Ptr &pkt, const SdpTrack::Ptr &track) {
	_rtpTicker.resetTime();
    onRecvRTP(pkt,track);

    int iTrackIndex = getTrackIndexByInterleaved(pkt->interleaved);
    if(iTrackIndex == -1){
        return;
    }
    RtcpCounter &counter = _aRtcpCnt[iTrackIndex];
    counter.pktCnt = pkt->sequence;
    auto &ticker = _aRtcpTicker[iTrackIndex];
    if (ticker.elapsedTime() > 5 * 1000) {
        //send rtcp every 5 second
        counter.lastTimeStamp = counter.timeStamp;
        //直接保存网络字节序
        memcpy(&counter.timeStamp, pkt->data() + 8 , 4);
        if(counter.lastTimeStamp != 0){
            sendReceiverReport(_eType == Rtsp::RTP_TCP,iTrackIndex);
            ticker.resetTime();
        }
    }


}
void RtspPlayer::onPlayResult_l(const SockException &ex , bool handshakeCompleted) {
	WarnL << ex.getErrCode() << " " << ex.what();

    if(!ex){
        //播放成功，恢复rtp接收超时定时器
        _rtpTicker.resetTime();
        weak_ptr<RtspPlayer> weakSelf = dynamic_pointer_cast<RtspPlayer>(shared_from_this());
        int timeoutMS = (*this)[kMediaTimeoutMS].as<int>();
		//创建rtp数据接收超时检测定时器
		_pRtpTimer.reset( new Timer(timeoutMS / 2000.0, [weakSelf,timeoutMS]() {
            auto strongSelf=weakSelf.lock();
            if(!strongSelf) {
                return false;
            }
            if(strongSelf->_rtpTicker.elapsedTime()> timeoutMS) {
				//接收rtp媒体数据包超时
				strongSelf->onPlayResult_l(SockException(Err_timeout,"receive rtp timeout"), true);
                return false;
            }
            return true;
        },getPoller()));
    }

    if (!handshakeCompleted) {
        //开始播放阶段
        _pPlayTimer.reset();
        onPlayResult(ex);
    } else if (ex) {
        //播放成功后异常断开回调
        onShutdown(ex);
    } else {
        //恢复播放
        onResume();
    }

    if(ex){
        teardown();
    }
}

int RtspPlayer::getTrackIndexByControlSuffix(const string &controlSuffix) const{
	for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
		auto pos = _aTrackInfo[i]->_control_surffix.find(controlSuffix);
		if (pos == 0) {
			return i;
		}
	}
	return -1;
}
int RtspPlayer::getTrackIndexByInterleaved(int interleaved) const{
	for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
		if (_aTrackInfo[i]->_interleaved == interleaved) {
			return i;
		}
	}
	return -1;
}

int RtspPlayer::getTrackIndexByTrackType(TrackType trackType) const {
	for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
		if (_aTrackInfo[i]->_type == trackType) {
			return i;
		}
	}
	return -1;
}

} /* namespace mediakit */