整理代码

This commit is contained in:
xiongziliang
2020-08-30 11:40:03 +08:00
parent fbd711a6bb
commit a7e99b9d37
10 changed files with 438 additions and 419 deletions

View File

@@ -17,8 +17,8 @@ using namespace mediakit::Client;
namespace mediakit {
RtspPusher::RtspPusher(const EventPoller::Ptr &poller,const RtspMediaSource::Ptr &src) : TcpClient(poller){
_pMediaSrc = src;
RtspPusher::RtspPusher(const EventPoller::Ptr &poller, const RtspMediaSource::Ptr &src) : TcpClient(poller) {
_push_src = src;
}
RtspPusher::~RtspPusher() {
@@ -28,30 +28,30 @@ RtspPusher::~RtspPusher() {
void RtspPusher::teardown() {
if (alive()) {
sendRtspRequest("TEARDOWN" ,_strContentBase);
shutdown(SockException(Err_shutdown,"teardown"));
sendRtspRequest("TEARDOWN", _content_base);
shutdown(SockException(Err_shutdown, "teardown"));
}
reset();
CLEAR_ARR(_apUdpSock);
_rtspMd5Nonce.clear();
_rtspRealm.clear();
_aTrackInfo.clear();
_strSession.clear();
_strContentBase.clear();
_strSession.clear();
_uiCseq = 1;
_pPublishTimer.reset();
_pBeatTimer.reset();
_pRtspReader.reset();
_aTrackInfo.clear();
_onHandshake = nullptr;
CLEAR_ARR(_udp_socks);
_nonce.clear();
_realm.clear();
_track_vec.clear();
_session_id.clear();
_content_base.clear();
_session_id.clear();
_cseq = 1;
_publish_timer.reset();
_beat_timer.reset();
_rtsp_reader.reset();
_track_vec.clear();
_on_res_func = nullptr;
}
void RtspPusher::publish(const string &strUrl) {
void RtspPusher::publish(const string &url_str) {
RtspUrl url;
if(!url.parse(strUrl)){
onPublishResult(SockException(Err_other,StrPrinter << "illegal rtsp url:" << strUrl),false);
if (!url.parse(url_str)) {
onPublishResult(SockException(Err_other, StrPrinter << "illegal rtsp url:" << url_str), false);
return;
}
@@ -65,55 +65,60 @@ void RtspPusher::publish(const string &strUrl) {
(*this)[kRtspPwdIsMD5] = false;
}
_strUrl = strUrl;
_eType = (Rtsp::eRtpType)(int)(*this)[kRtpType];
DebugL << url._url << " " << (url._user.size() ? url._user : "null") << " " << (url._passwd.size() ? url._passwd : "null") << " " << _eType;
_url = url_str;
_rtp_type = (Rtsp::eRtpType) (int) (*this)[kRtpType];
DebugL << url._url << " " << (url._user.size() ? url._user : "null") << " "
<< (url._passwd.size() ? url._passwd : "null") << " " << _rtp_type;
weak_ptr<RtspPusher> weakSelf = dynamic_pointer_cast<RtspPusher>(shared_from_this());
float publishTimeOutSec = (*this)[kTimeoutMS].as<int>() / 1000.0;
_pPublishTimer.reset( new Timer(publishTimeOutSec, [weakSelf]() {
auto strongSelf=weakSelf.lock();
if(!strongSelf) {
weak_ptr<RtspPusher> weak_self = dynamic_pointer_cast<RtspPusher>(shared_from_this());
float publish_timeout_sec = (*this)[kTimeoutMS].as<int>() / 1000.0;
_publish_timer.reset(new Timer(publish_timeout_sec, [weak_self]() {
auto strong_self = weak_self.lock();
if (!strong_self) {
return false;
}
strongSelf->onPublishResult(SockException(Err_timeout,"publish rtsp timeout"),false);
strong_self->onPublishResult(SockException(Err_timeout, "publish rtsp timeout"), false);
return false;
},getPoller()));
}, getPoller()));
if(!(*this)[kNetAdapter].empty()){
if (!(*this)[kNetAdapter].empty()) {
setNetAdapter((*this)[kNetAdapter]);
}
startConnect(url._host, url._port, publishTimeOutSec);
startConnect(url._host, url._port, publish_timeout_sec);
}
void RtspPusher::onPublishResult(const SockException &ex, bool handshakeCompleted) {
if(!handshakeCompleted){
void RtspPusher::onPublishResult(const SockException &ex, bool handshake_done) {
if (ex.getErrCode() == Err_shutdown) {
//主动shutdown的不触发回调
return;
}
if (!handshake_done) {
//播放结果回调
_pPublishTimer.reset();
if(_onPublished){
_onPublished(ex);
_publish_timer.reset();
if (_on_published) {
_on_published(ex);
}
} else {
//播放成功后异常断开回调
if(_onShutdown){
_onShutdown(ex);
if (_on_shutdown) {
_on_shutdown(ex);
}
}
if(ex){
if (ex) {
teardown();
}
}
void RtspPusher::onErr(const SockException &ex) {
//定时器_pPublishTimer为空后表明握手结束了
onPublishResult(ex,!_pPublishTimer);
onPublishResult(ex, !_publish_timer);
}
void RtspPusher::onConnect(const SockException &err) {
if(err) {
onPublishResult(err,false);
if (err) {
onPublishResult(err, false);
return;
}
//推流器不需要多大的接收缓存,节省内存占用
@@ -121,41 +126,40 @@ void RtspPusher::onConnect(const SockException &err) {
sendAnnounce();
}
void RtspPusher::onRecv(const Buffer::Ptr &pBuf){
void RtspPusher::onRecv(const Buffer::Ptr &buf){
try {
input(pBuf->data(), pBuf->size());
input(buf->data(), buf->size());
} catch (exception &e) {
SockException ex(Err_other, e.what());
//定时器_pPublishTimer为空后表明握手结束了
onPublishResult(ex,!_pPublishTimer);
onPublishResult(ex, !_publish_timer);
}
}
void RtspPusher::onWholeRtspPacket(Parser &parser) {
decltype(_onHandshake) fun;
_onHandshake.swap(fun);
if(fun){
fun(parser);
decltype(_on_res_func) func;
_on_res_func.swap(func);
if (func) {
func(parser);
}
parser.Clear();
}
void RtspPusher::sendAnnounce() {
auto src = _pMediaSrc.lock();
auto src = _push_src.lock();
if (!src) {
throw std::runtime_error("the media source was released");
}
//解析sdp
_sdpParser.load(src->getSdp());
_aTrackInfo = _sdpParser.getAvailableTrack();
_sdp_parser.load(src->getSdp());
_track_vec = _sdp_parser.getAvailableTrack();
if (_aTrackInfo.empty()) {
if (_track_vec.empty()) {
throw std::runtime_error("无有效的Sdp Track");
}
_onHandshake = std::bind(&RtspPusher::handleResAnnounce,this, placeholders::_1);
sendRtspRequest("ANNOUNCE",_strUrl,{},src->getSdp());
_on_res_func = std::bind(&RtspPusher::handleResAnnounce, this, placeholders::_1);
sendRtspRequest("ANNOUNCE", _url, {}, src->getSdp());
}
void RtspPusher::handleResAnnounce(const Parser &parser) {
@@ -165,9 +169,9 @@ void RtspPusher::handleResAnnounce(const Parser &parser) {
sendAnnounce();
return;
}
if(parser.Url() == "302"){
if (parser.Url() == "302") {
auto newUrl = parser["Location"];
if(newUrl.empty()){
if (newUrl.empty()) {
throw std::runtime_error("未找到Location字段(跳转url)");
}
publish(newUrl);
@@ -176,45 +180,45 @@ void RtspPusher::handleResAnnounce(const Parser &parser) {
if (parser.Url() != "200") {
throw std::runtime_error(StrPrinter << "ANNOUNCE:" << parser.Url() << " " << parser.Tail());
}
_strContentBase = parser["Content-Base"];
_content_base = parser["Content-Base"];
if(_strContentBase.empty()){
_strContentBase = _strUrl;
if (_content_base.empty()) {
_content_base = _url;
}
if (_strContentBase.back() == '/') {
_strContentBase.pop_back();
if (_content_base.back() == '/') {
_content_base.pop_back();
}
sendSetup(0);
}
bool RtspPusher::handleAuthenticationFailure(const string &paramsStr) {
if(!_rtspRealm.empty()){
bool RtspPusher::handleAuthenticationFailure(const string &params_str) {
if (!_realm.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,[&](){
char *realm = new char[params_str.size()];
char *nonce = new char[params_str.size()];
char *stale = new char[params_str.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;
if (sscanf(params_str.data(), "Digest realm=\"%[^\"]\", nonce=\"%[^\"]\", stale=%[a-zA-Z]", realm, nonce, stale) == 3) {
_realm = (const char *) realm;
_nonce = (const char *) nonce;
return true;
}
if (sscanf(paramsStr.data(), "Digest realm=\"%[^\"]\", nonce=\"%[^\"]\"", realm, nonce) == 2) {
_rtspRealm = (const char *)realm;
_rtspMd5Nonce = (const char *)nonce;
if (sscanf(params_str.data(), "Digest realm=\"%[^\"]\", nonce=\"%[^\"]\"", realm, nonce) == 2) {
_realm = (const char *) realm;
_nonce = (const char *) nonce;
return true;
}
if (sscanf(paramsStr.data(), "Basic realm=\"%[^\"]\"", realm) == 1) {
_rtspRealm = (const char *)realm;
if (sscanf(params_str.data(), "Basic realm=\"%[^\"]\"", realm) == 1) {
_realm = (const char *) realm;
return true;
}
return false;
@@ -222,30 +226,33 @@ bool RtspPusher::handleAuthenticationFailure(const string &paramsStr) {
//有必要的情况下创建udp端口
void RtspPusher::createUdpSockIfNecessary(int track_idx){
auto &rtpSockRef = _apUdpSock[track_idx];
if(!rtpSockRef){
rtpSockRef.reset(new Socket(getPoller()));
auto &rtp_sock = _udp_socks[track_idx];
if (!rtp_sock) {
rtp_sock.reset(new Socket(getPoller()));
//rtp随机端口
if (!rtpSockRef->bindUdpSock(0, get_local_ip().data())) {
rtpSockRef.reset();
if (!rtp_sock->bindUdpSock(0, get_local_ip().data())) {
rtp_sock.reset();
throw std::runtime_error("open rtp sock failed");
}
}
}
void RtspPusher::sendSetup(unsigned int trackIndex) {
_onHandshake = std::bind(&RtspPusher::handleResSetup,this, placeholders::_1,trackIndex);
auto &track = _aTrackInfo[trackIndex];
auto baseUrl = _strContentBase + "/" + track->_control_surffix;
switch (_eType) {
void RtspPusher::sendSetup(unsigned int track_idx) {
_on_res_func = std::bind(&RtspPusher::handleResSetup, this, placeholders::_1, track_idx);
auto &track = _track_vec[track_idx];
auto base_url = _content_base + "/" + track->_control_surffix;
switch (_rtp_type) {
case Rtsp::RTP_TCP: {
sendRtspRequest("SETUP",baseUrl,{"Transport",StrPrinter << "RTP/AVP/TCP;unicast;interleaved=" << track->_type * 2 << "-" << track->_type * 2 + 1});
sendRtspRequest("SETUP", base_url, {"Transport",
StrPrinter << "RTP/AVP/TCP;unicast;interleaved=" << track->_type * 2
<< "-" << track->_type * 2 + 1});
}
break;
case Rtsp::RTP_UDP: {
createUdpSockIfNecessary(trackIndex);
int port = _apUdpSock[trackIndex]->get_local_port();
sendRtspRequest("SETUP",baseUrl,{"Transport",StrPrinter << "RTP/AVP;unicast;client_port=" << port << "-" << port + 1});
createUdpSockIfNecessary(track_idx);
int port = _udp_socks[track_idx]->get_local_port();
sendRtspRequest("SETUP", base_url,
{"Transport", StrPrinter << "RTP/AVP;unicast;client_port=" << port << "-" << port + 1});
}
break;
default:
@@ -254,42 +261,41 @@ void RtspPusher::sendSetup(unsigned int trackIndex) {
}
void RtspPusher::handleResSetup(const Parser &parser, unsigned int uiTrackIndex) {
void RtspPusher::handleResSetup(const Parser &parser, unsigned int track_idx) {
if (parser.Url() != "200") {
throw std::runtime_error(
StrPrinter << "SETUP:" << parser.Url() << " " << parser.Tail() << endl);
throw std::runtime_error(StrPrinter << "SETUP:" << parser.Url() << " " << parser.Tail() << endl);
}
if (uiTrackIndex == 0) {
_strSession = parser["Session"];
_strSession.append(";");
_strSession = FindField(_strSession.data(), nullptr, ";");
if (track_idx == 0) {
_session_id = parser["Session"];
_session_id.append(";");
_session_id = FindField(_session_id.data(), nullptr, ";");
}
auto strTransport = parser["Transport"];
if(strTransport.find("TCP") != string::npos || strTransport.find("interleaved") != string::npos){
_eType = Rtsp::RTP_TCP;
string interleaved = FindField( FindField((strTransport + ";").data(), "interleaved=", ";").data(), NULL, "-");
_aTrackInfo[uiTrackIndex]->_interleaved = atoi(interleaved.data());
}else if(strTransport.find("multicast") != string::npos){
auto transport = parser["Transport"];
if (transport.find("TCP") != string::npos || transport.find("interleaved") != string::npos) {
_rtp_type = Rtsp::RTP_TCP;
string interleaved = FindField(FindField((transport + ";").data(), "interleaved=", ";").data(), NULL, "-");
_track_vec[track_idx]->_interleaved = atoi(interleaved.data());
} else if (transport.find("multicast") != string::npos) {
throw std::runtime_error("SETUP rtsp pusher can not support multicast!");
}else{
_eType = Rtsp::RTP_UDP;
createUdpSockIfNecessary(uiTrackIndex);
const char *strPos = "server_port=" ;
auto port_str = FindField((strTransport + ";").data(), strPos, ";");
} else {
_rtp_type = Rtsp::RTP_UDP;
createUdpSockIfNecessary(track_idx);
const char *strPos = "server_port=";
auto port_str = FindField((transport + ";").data(), strPos, ";");
uint16_t port = atoi(FindField(port_str.data(), NULL, "-").data());
struct sockaddr_in rtpto;
rtpto.sin_port = ntohs(port);
rtpto.sin_family = AF_INET;
rtpto.sin_addr.s_addr = inet_addr(get_peer_ip().data());
_apUdpSock[uiTrackIndex]->setSendPeerAddr((struct sockaddr *)&(rtpto));
_udp_socks[track_idx]->setSendPeerAddr((struct sockaddr *) &(rtpto));
}
RtspSplitter::enableRecvRtp(_eType == Rtsp::RTP_TCP);
RtspSplitter::enableRecvRtp(_rtp_type == Rtsp::RTP_TCP);
if (uiTrackIndex < _aTrackInfo.size() - 1) {
if (track_idx < _track_vec.size() - 1) {
//需要继续发送SETUP命令
sendSetup(uiTrackIndex + 1);
sendSetup(track_idx + 1);
return;
}
@@ -297,13 +303,12 @@ void RtspPusher::handleResSetup(const Parser &parser, unsigned int uiTrackIndex)
}
void RtspPusher::sendOptions() {
_onHandshake = [this](const Parser& parser){};
sendRtspRequest("OPTIONS",_strContentBase);
_on_res_func = [this](const Parser &parser) {};
sendRtspRequest("OPTIONS", _content_base);
}
inline void RtspPusher::sendRtpPacket(const RtspMediaSource::RingDataType &pkt) {
//InfoL<<(int)pkt.Interleaved;
switch (_eType) {
switch (_rtp_type) {
case Rtsp::RTP_TCP: {
int i = 0;
int size = pkt->size();
@@ -315,85 +320,84 @@ inline void RtspPusher::sendRtpPacket(const RtspMediaSource::RingDataType &pkt)
BufferRtp::Ptr buffer(new BufferRtp(rtp));
send(buffer);
});
}
break;
}
case Rtsp::RTP_UDP: {
int i = 0;
int size = pkt->size();
pkt->for_each([&](const RtpPacket::Ptr &rtp) {
int iTrackIndex = getTrackIndexByTrackType(rtp->type);
auto &pSock = _apUdpSock[iTrackIndex];
auto &pSock = _udp_socks[iTrackIndex];
if (!pSock) {
shutdown(SockException(Err_shutdown,"udp sock not opened yet"));
shutdown(SockException(Err_shutdown, "udp sock not opened yet"));
return;
}
BufferRtp::Ptr buffer(new BufferRtp(rtp,4));
BufferRtp::Ptr buffer(new BufferRtp(rtp, 4));
pSock->send(buffer, nullptr, 0, ++i == size);
});
break;
}
break;
default:
break;
default : break;
}
}
inline int RtspPusher::getTrackIndexByTrackType(TrackType type) {
for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
if (type == _aTrackInfo[i]->_type) {
for (unsigned int i = 0; i < _track_vec.size(); i++) {
if (type == _track_vec[i]->_type) {
return i;
}
}
if(_aTrackInfo.size() == 1){
if (_track_vec.size() == 1) {
return 0;
}
throw SockException(Err_shutdown, StrPrinter << "no such track with type:" << (int) type);
}
void RtspPusher::sendRecord() {
_onHandshake = [this](const Parser& parser){
auto src = _pMediaSrc.lock();
_on_res_func = [this](const Parser &parser) {
auto src = _push_src.lock();
if (!src) {
throw std::runtime_error("the media source was released");
}
_pRtspReader = src->getRing()->attach(getPoller());
weak_ptr<RtspPusher> weakSelf = dynamic_pointer_cast<RtspPusher>(shared_from_this());
_pRtspReader->setReadCB([weakSelf](const RtspMediaSource::RingDataType &pkt){
auto strongSelf = weakSelf.lock();
if(!strongSelf) {
_rtsp_reader = src->getRing()->attach(getPoller());
weak_ptr<RtspPusher> weak_self = dynamic_pointer_cast<RtspPusher>(shared_from_this());
_rtsp_reader->setReadCB([weak_self](const RtspMediaSource::RingDataType &pkt) {
auto strong_self = weak_self.lock();
if (!strong_self) {
return;
}
strongSelf->sendRtpPacket(pkt);
strong_self->sendRtpPacket(pkt);
});
_pRtspReader->setDetachCB([weakSelf](){
auto strongSelf = weakSelf.lock();
if(strongSelf){
strongSelf->onPublishResult(SockException(Err_other,"媒体源被释放"), !strongSelf->_pPublishTimer);
_rtsp_reader->setDetachCB([weak_self]() {
auto strong_self = weak_self.lock();
if (strong_self) {
strong_self->onPublishResult(SockException(Err_other, "媒体源被释放"), !strong_self->_publish_timer);
}
});
if(_eType != Rtsp::RTP_TCP){
if (_rtp_type != Rtsp::RTP_TCP) {
/////////////////////////心跳/////////////////////////////////
weak_ptr<RtspPusher> weakSelf = dynamic_pointer_cast<RtspPusher>(shared_from_this());
_pBeatTimer.reset(new Timer((*this)[kBeatIntervalMS].as<int>() / 1000.0, [weakSelf](){
auto strongSelf = weakSelf.lock();
if (!strongSelf){
_beat_timer.reset(new Timer((*this)[kBeatIntervalMS].as<int>() / 1000.0, [weak_self]() {
auto strong_self = weak_self.lock();
if (!strong_self) {
return false;
}
strongSelf->sendOptions();
strong_self->sendOptions();
return true;
},getPoller()));
}, getPoller()));
}
onPublishResult(SockException(Err_success,"success"), false);
onPublishResult(SockException(Err_success, "success"), false);
//提升发送性能
setSocketFlags();
};
sendRtspRequest("RECORD",_strContentBase,{"Range","npt=0.000-"});
sendRtspRequest("RECORD", _content_base, {"Range", "npt=0.000-"});
}
void RtspPusher::setSocketFlags(){
GET_CONFIG(int, mergeWriteMS, General::kMergeWriteMS);
if(mergeWriteMS > 0) {
GET_CONFIG(int, merge_write_ms, General::kMergeWriteMS);
if (merge_write_ms > 0) {
//提高发送性能
setSendFlags(SOCKET_DEFAULE_FLAGS | FLAG_MORE);
SockUtil::setNoDelay(_sock->rawFD(), false);
@@ -404,26 +408,26 @@ void RtspPusher::sendRtspRequest(const string &cmd, const string &url, const std
string key;
StrCaseMap header_map;
int i = 0;
for(auto &val : header){
if(++i % 2 == 0){
header_map.emplace(key,val);
}else{
for (auto &val : header) {
if (++i % 2 == 0) {
header_map.emplace(key, val);
} else {
key = val;
}
}
sendRtspRequest(cmd,url,header_map,sdp);
sendRtspRequest(cmd, url, header_map, sdp);
}
void RtspPusher::sendRtspRequest(const string &cmd, const string &url,const StrCaseMap &header_const,const string &sdp ) {
auto header = header_const;
header.emplace("CSeq",StrPrinter << _uiCseq++);
header.emplace("User-Agent",SERVER_NAME);
header.emplace("CSeq", StrPrinter << _cseq++);
header.emplace("User-Agent", SERVER_NAME);
if(!_strSession.empty()){
header.emplace("Session",_strSession);
if (!_session_id.empty()) {
header.emplace("Session", _session_id);
}
if(!_rtspRealm.empty() && !(*this)[kRtspUser].empty()){
if(!_rtspMd5Nonce.empty()){
if (!_realm.empty() && !(*this)[kRtspUser].empty()) {
if (!_nonce.empty()) {
//MD5认证
/*
response计算方法如下
@@ -434,41 +438,41 @@ void RtspPusher::sendRtspRequest(const string &cmd, const string &url,const StrC
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();
if (!(*this)[kRtspPwdIsMD5].as<bool>()) {
encrypted_pwd = MD5((*this)[kRtspUser] + ":" + _realm + ":" + encrypted_pwd).hexdigest();
}
auto response = MD5( encrypted_pwd + ":" + _rtspMd5Nonce + ":" + MD5(cmd + ":" + url).hexdigest()).hexdigest();
auto response = MD5(encrypted_pwd + ":" + _nonce + ":" + MD5(cmd + ":" + url).hexdigest()).hexdigest();
_StrPrinter printer;
printer << "Digest ";
printer << "username=\"" << (*this)[kRtspUser] << "\", ";
printer << "realm=\"" << _rtspRealm << "\", ";
printer << "nonce=\"" << _rtspMd5Nonce << "\", ";
printer << "realm=\"" << _realm << "\", ";
printer << "nonce=\"" << _nonce << "\", ";
printer << "uri=\"" << url << "\", ";
printer << "response=\"" << response << "\"";
header.emplace("Authorization",printer);
}else if(!(*this)[kRtspPwdIsMD5].as<bool>()){
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 );
av_base64_encode(authStrBase64, sizeof(authStrBase64), (uint8_t *) authStr.data(), authStr.size());
header.emplace("Authorization", StrPrinter << "Basic " << authStrBase64);
}
}
if(!sdp.empty()){
header.emplace("Content-Length",StrPrinter << sdp.size());
header.emplace("Content-Type","application/sdp");
if (!sdp.empty()) {
header.emplace("Content-Length", StrPrinter << sdp.size());
header.emplace("Content-Type", "application/sdp");
}
_StrPrinter printer;
printer << cmd << " " << url << " RTSP/1.0\r\n";
for (auto &pr : header){
for (auto &pr : header) {
printer << pr.first << ": " << pr.second << "\r\n";
}
printer << "\r\n";
if(!sdp.empty()){
if (!sdp.empty()) {
printer << sdp;
}
SockSender::send(printer);