ZLMediaKit/webrtc/WebRtcTransport.cpp
2021-03-28 23:52:26 +08:00

242 lines
7.9 KiB
C++

#include "WebRtcTransport.h"
#include <iostream>
#include "Rtcp/Rtcp.h"
WebRtcTransport::WebRtcTransport(const EventPoller::Ptr &poller) {
dtls_transport_ = std::make_shared<RTC::DtlsTransport>(poller, this);
ice_server_ = std::make_shared<RTC::IceServer>(this, makeRandStr(4), makeRandStr(24));
}
void WebRtcTransport::onDestory(){
dtls_transport_ = nullptr;
ice_server_ = nullptr;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void WebRtcTransport::OnIceServerSendStunPacket(const RTC::IceServer *iceServer, const RTC::StunPacket *packet, RTC::TransportTuple *tuple) {
onWrite((char *)packet->GetData(), packet->GetSize(), (struct sockaddr_in *)tuple);
}
void WebRtcTransport::OnIceServerSelectedTuple(const RTC::IceServer *iceServer, RTC::TransportTuple *tuple) {
InfoL;
}
void WebRtcTransport::OnIceServerConnected(const RTC::IceServer *iceServer) {
InfoL;
dtls_transport_->Run(RTC::DtlsTransport::Role::SERVER);
}
void WebRtcTransport::OnIceServerCompleted(const RTC::IceServer *iceServer) {
InfoL;
}
void WebRtcTransport::OnIceServerDisconnected(const RTC::IceServer *iceServer) {
InfoL;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void WebRtcTransport::OnDtlsTransportConnected(
const RTC::DtlsTransport *dtlsTransport,
RTC::SrtpSession::CryptoSuite srtpCryptoSuite,
uint8_t *srtpLocalKey,
size_t srtpLocalKeyLen,
uint8_t *srtpRemoteKey,
size_t srtpRemoteKeyLen,
std::string &remoteCert) {
InfoL;
srtp_session_ = std::make_shared<RTC::SrtpSession>(RTC::SrtpSession::Type::OUTBOUND, srtpCryptoSuite, srtpLocalKey, srtpLocalKeyLen);
onDtlsConnected();
}
void WebRtcTransport::OnDtlsTransportSendData(const RTC::DtlsTransport *dtlsTransport, const uint8_t *data, size_t len) {
onWrite((char *)data, len);
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void WebRtcTransport::onWrite(const char *buf, size_t len){
auto tuple = ice_server_->GetSelectedTuple();
assert(tuple);
onWrite(buf, len, (struct sockaddr_in *)tuple);
}
std::string WebRtcTransport::GetLocalSdp() {
RTC::DtlsTransport::Fingerprint remote_fingerprint;
remote_fingerprint.algorithm = RTC::DtlsTransport::GetFingerprintAlgorithm("sha-256");
remote_fingerprint.value = "";
dtls_transport_->SetRemoteFingerprint(remote_fingerprint);
string finger_print_sha256;
auto finger_prints = dtls_transport_->GetLocalFingerprints();
for (size_t i = 0; i < finger_prints.size(); i++) {
if (finger_prints[i].algorithm == RTC::DtlsTransport::FingerprintAlgorithm::SHA256) {
finger_print_sha256 = finger_prints[i].value;
}
}
char sdp[1024 * 10] = {0};
auto ssrc = getSSRC();
auto ip = getIP();
auto pt = getPayloadType();
auto port = getPort();
sprintf(sdp,
"v=0\r\n"
"o=- 1495799811084970 1495799811084970 IN IP4 %s\r\n"
"s=Streaming Test\r\n"
"t=0 0\r\n"
"a=group:BUNDLE video\r\n"
"a=msid-semantic: WMS janus\r\n"
"m=video %u RTP/SAVPF %u\r\n"
"c=IN IP4 %s\r\n"
"a=mid:video\r\n"
"a=sendonly\r\n"
"a=rtcp-mux\r\n"
"a=ice-lite\r\n"
"a=ice-ufrag:%s\r\n"
"a=ice-pwd:%s\r\n"
"a=ice-options:trickle\r\n"
"a=fingerprint:sha-256 %s\r\n"
"a=setup:actpass\r\n"
"a=connection:new\r\n"
"a=rtpmap:%u H264/90000\r\n"
"a=ssrc:%u cname:janusvideo\r\n"
"a=ssrc:%u msid:janus janusv0\r\n"
"a=ssrc:%u mslabel:janus\r\n"
"a=ssrc:%u label:janusv0\r\n"
"a=candidate:%s 1 udp %u %s %u typ %s\r\n",
ip.c_str(), port, pt, ip.c_str(),
ice_server_->GetUsernameFragment().c_str(),ice_server_->GetPassword().c_str(),
finger_print_sha256.c_str(), pt, ssrc, ssrc, ssrc, ssrc, "4", ssrc, ip.c_str(), port, "host");
return sdp;
}
bool is_dtls(char *buf) {
return ((*buf > 19) && (*buf < 64));
}
bool is_rtp(char *buf) {
RtpHeader *header = (RtpHeader *) buf;
return ((header->pt < 64) || (header->pt >= 96));
}
bool is_rtcp(char *buf) {
RtpHeader *header = (RtpHeader *) buf;
return ((header->pt >= 64) && (header->pt < 96));
}
void WebRtcTransport::OnInputDataPacket(char *buf, size_t len, RTC::TransportTuple *tuple) {
if (RTC::StunPacket::IsStun((const uint8_t *) buf, len)) {
RTC::StunPacket *packet = RTC::StunPacket::Parse((const uint8_t *) buf, len);
if (packet == nullptr) {
WarnL << "parse stun error" << std::endl;
return;
}
ice_server_->ProcessStunPacket(packet, tuple);
return;
}
if (is_dtls(buf)) {
dtls_transport_->ProcessDtlsData((uint8_t *)buf, len);
return;
}
if (is_rtp(buf)) {
RtpHeader *header = (RtpHeader *) buf;
// InfoL << "rtp:" << header->dumpString(len);
return;
}
if (is_rtcp(buf)) {
RtcpHeader *header = (RtcpHeader *) buf;
// InfoL << "rtcp:" << header->dumpString();
return;
}
}
void WebRtcTransport::WritRtpPacket(char *buf, size_t len) {
const uint8_t *p = (uint8_t *) buf;
bool ret = false;
if (srtp_session_) {
ret = srtp_session_->EncryptRtp(&p, &len);
}
if (ret) {
onWrite((char *) p, len);
}
}
///////////////////////////////////////////////////////////////////////////////////
WebRtcTransportImp::Ptr WebRtcTransportImp::create(const EventPoller::Ptr &poller){
WebRtcTransportImp::Ptr ret(new WebRtcTransportImp(poller), [](WebRtcTransportImp *ptr){
ptr->onDestory();
delete ptr;
});
return ret;
}
WebRtcTransportImp::WebRtcTransportImp(const EventPoller::Ptr &poller) : WebRtcTransport(poller) {
_socket = Socket::createSocket(poller, false);
//随机端口,绑定全部网卡
_socket->bindUdpSock(0);
_socket->setOnRead([this](const Buffer::Ptr &buf, struct sockaddr *addr, int addr_len) mutable {
OnInputDataPacket(buf->data(), buf->size(), addr);
});
}
void WebRtcTransportImp::onDestory() {
WebRtcTransport::onDestory();
}
void WebRtcTransportImp::attach(const RtspMediaSource::Ptr &src) {
assert(src);
_src = src;
}
void WebRtcTransportImp::onDtlsConnected() {
_reader = _src->getRing()->attach(_socket->getPoller(), true);
weak_ptr<WebRtcTransportImp> weak_self = shared_from_this();
_reader->setReadCB([weak_self](const RtspMediaSource::RingDataType &pkt){
auto strongSelf = weak_self.lock();
if (!strongSelf) {
return;
}
pkt->for_each([&](const RtpPacket::Ptr &rtp) {
if(rtp->type == TrackVideo) {
//目前只支持视频
strongSelf->WritRtpPacket(rtp->data() + RtpPacket::kRtpTcpHeaderSize,
rtp->size() - RtpPacket::kRtpTcpHeaderSize);
}
});
});
}
void WebRtcTransportImp::onWrite(const char *buf, size_t len, struct sockaddr_in *dst) {
auto ptr = BufferRaw::create();
ptr->assign(buf, len);
_socket->send(ptr, (struct sockaddr *)(dst), sizeof(struct sockaddr));
}
uint32_t WebRtcTransportImp::getSSRC() const {
return _src->getSsrc(TrackVideo);
}
int WebRtcTransportImp::getPayloadType() const{
auto sdp = SdpParser(_src->getSdp());
auto track = sdp.getTrack(TrackVideo);
assert(track);
return track ? track->_pt : 0;
}
uint16_t WebRtcTransportImp::getPort() const {
//todo udp端口号应该与外网映射端口相同
return _socket->get_local_port();
}
std::string WebRtcTransportImp::getIP() const {
//todo 替换为外网ip
return SockUtil::get_local_ip();
}
///////////////////////////////////////////////////////////////////