mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-27 13:49:01 +08:00
548 lines
16 KiB
C++
548 lines
16 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include <stdlib.h>
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#include "Rtsp.h"
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#include "Common/Parser.h"
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namespace mediakit{
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int RtpPayload::getClockRate(int pt){
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switch (pt){
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#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value : return clock_rate;
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RTP_PT_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default: return 90000;
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}
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}
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TrackType RtpPayload::getTrackType(int pt){
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switch (pt){
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#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value : return type;
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RTP_PT_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default: return TrackInvalid;
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}
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}
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int RtpPayload::getAudioChannel(int pt){
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switch (pt){
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#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value : return channel;
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RTP_PT_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default: return 1;
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}
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}
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const char * RtpPayload::getName(int pt){
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switch (pt){
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#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value : return #name;
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RTP_PT_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default: return "unknown payload type";
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}
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}
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CodecId RtpPayload::getCodecId(int pt) {
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switch (pt) {
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#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value : return codec_id;
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RTP_PT_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default : return CodecInvalid;
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}
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}
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static void getAttrSdp(const map<string, string> &attr, _StrPrinter &printer){
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const map<string, string>::value_type *ptr = nullptr;
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for(auto &pr : attr){
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if(pr.first == "control"){
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ptr = ≺
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continue;
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}
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if(pr.second.empty()){
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printer << "a=" << pr.first << "\r\n";
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}else{
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printer << "a=" << pr.first << ":" << pr.second << "\r\n";
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}
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}
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if(ptr){
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printer << "a=" << ptr->first << ":" << ptr->second << "\r\n";
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}
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}
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string SdpTrack::getName() const{
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switch (_pt){
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#define SWITCH_CASE(name, type, value, clock_rate, channel, codec_id) case value : return #name;
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RTP_PT_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default: return _codec;
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}
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}
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string SdpTrack::toString() const {
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_StrPrinter _printer;
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switch (_type){
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case TrackTitle:{
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_printer << "v=" << 0 << "\r\n";
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if(!_o.empty()){
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_printer << "o="<< _o << "\r\n";
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}
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if(!_c.empty()){
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_printer << "c=" << _c << "\r\n";
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}
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if(!_t.empty()){
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_printer << "t=" << _t << "\r\n";
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}
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_printer << "s=Streamed by " << SERVER_NAME << "\r\n";
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getAttrSdp(_attr,_printer);
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}
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break;
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case TrackAudio:
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case TrackVideo:{
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if(_type == TrackAudio){
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_printer << "m=audio 0 RTP/AVP " << _pt << "\r\n";
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}else{
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_printer << "m=video 0 RTP/AVP " << _pt << "\r\n";
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}
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if(!_b.empty()){
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_printer << "b=" <<_b << "\r\n";
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}
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getAttrSdp(_attr,_printer);
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}
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break;
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default:
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break;
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}
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return std::move(_printer);
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}
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static TrackType toTrackType(const string &str) {
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if (str == "") {
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return TrackTitle;
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}
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if (str == "video") {
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return TrackVideo;
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}
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if (str == "audio") {
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return TrackAudio;
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}
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return TrackInvalid;
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}
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void SdpParser::load(const string &sdp) {
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{
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_track_vec.clear();
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SdpTrack::Ptr track = std::make_shared<SdpTrack>();
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track->_type = TrackTitle;
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_track_vec.emplace_back(track);
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auto lines = split(sdp, "\n");
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for (auto &line : lines) {
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trim(line);
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if (line.size() < 2 || line[1] != '=') {
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continue;
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}
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char opt = line[0];
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string opt_val = line.substr(2);
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switch (opt) {
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case 'o':
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track->_o = opt_val;
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break;
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case 's':
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track->_s = opt_val;
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break;
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case 'i':
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track->_i = opt_val;
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break;
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case 'c':
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track->_c = opt_val;
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break;
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case 't':
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track->_t = opt_val;
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break;
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case 'b':
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track->_b = opt_val;
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break;
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case 'm': {
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track = std::make_shared<SdpTrack>();
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int pt, port;
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char rtp[16] = {0}, type[16];
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if (4 == sscanf(opt_val.data(), " %15[^ ] %d %15[^ ] %d", type, &port, rtp, &pt)) {
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track->_pt = pt;
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track->_samplerate = RtpPayload::getClockRate(pt) ;
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track->_channel = RtpPayload::getAudioChannel(pt);
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track->_type = toTrackType(type);
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track->_m = opt_val;
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track->_port = port;
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_track_vec.emplace_back(track);
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}
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}
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break;
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case 'a': {
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string attr = FindField(opt_val.data(), nullptr, ":");
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if (attr.empty()) {
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track->_attr[opt_val] = "";
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} else {
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track->_attr[attr] = FindField(opt_val.data(), ":", nullptr);
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}
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}
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break;
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default:
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track->_other[opt] = opt_val;
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break;
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}
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}
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}
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for (auto &track_ptr : _track_vec) {
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auto &track = *track_ptr;
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auto it = track._attr.find("range");
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if (it != track._attr.end()) {
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char name[16] = {0}, start[16] = {0}, end[16] = {0};
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int ret = sscanf(it->second.data(), "%15[^=]=%15[^-]-%15s", name, start, end);
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if (3 == ret || 2 == ret) {
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if (strcmp(start, "now") == 0) {
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strcpy(start, "0");
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}
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track._start = (float)atof(start);
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track._end = (float)atof(end);
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track._duration = track._end - track._start;
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}
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}
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it = track._attr.find("rtpmap");
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if(it != track._attr.end()){
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auto rtpmap = it->second;
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int pt, samplerate, channel;
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char codec[16] = {0};
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if (4 == sscanf(rtpmap.data(), "%d %15[^/]/%d/%d", &pt, codec, &samplerate, &channel)) {
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track._pt = pt;
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track._codec = codec;
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track._samplerate = samplerate;
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track._channel = channel;
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}else if (3 == sscanf(rtpmap.data(), "%d %15[^/]/%d", &pt, codec, &samplerate)) {
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track._pt = pt;
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track._codec = codec;
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track._samplerate = samplerate;
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}
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}
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it = track._attr.find("fmtp");
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if(it != track._attr.end()) {
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track._fmtp = it->second;
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}
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it = track._attr.find("control");
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if(it != track._attr.end()) {
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track._control = it->second;
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auto surffix = string("/") + track._control;
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track._control_surffix = surffix.substr(1 + surffix.rfind('/'));
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}
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}
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}
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bool SdpParser::available() const {
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return getTrack(TrackAudio) || getTrack(TrackVideo);
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}
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SdpTrack::Ptr SdpParser::getTrack(TrackType type) const {
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for (auto &track : _track_vec){
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if(track->_type == type){
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return track;
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}
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}
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return nullptr;
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}
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vector<SdpTrack::Ptr> SdpParser::getAvailableTrack() const {
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vector<SdpTrack::Ptr> ret;
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bool audio_added = false;
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bool video_added = false;
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for (auto &track : _track_vec){
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if(track->_type == TrackAudio ){
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if(!audio_added){
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ret.emplace_back(track);
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audio_added = true;
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}
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continue;
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}
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if(track->_type == TrackVideo ){
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if(!video_added){
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ret.emplace_back(track);
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video_added = true;
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}
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continue;
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}
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}
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return ret;
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}
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string SdpParser::toString() const {
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string title,audio,video;
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for(auto &track : _track_vec){
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switch (track->_type){
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case TrackTitle:{
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title = track->toString();
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}
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break;
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case TrackVideo:{
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video = track->toString();
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}
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break;
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case TrackAudio:{
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audio = track->toString();
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}
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break;
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default:
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break;
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}
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}
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return title + video + audio;
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}
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bool RtspUrl::parse(const string &strUrl) {
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auto schema = FindField(strUrl.data(), nullptr, "://");
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bool isSSL = strcasecmp(schema.data(), "rtsps") == 0;
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//查找"://"与"/"之间的字符串，用于提取用户名密码
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auto middle_url = FindField(strUrl.data(), "://", "/");
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if (middle_url.empty()) {
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middle_url = FindField(strUrl.data(), "://", nullptr);
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}
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auto pos = middle_url.rfind('@');
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if (pos == string::npos) {
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//并没有用户名密码
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return setup(isSSL, strUrl, "", "");
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}
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//包含用户名密码
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auto user_pwd = middle_url.substr(0, pos);
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auto suffix = strUrl.substr(schema.size() + 3 + pos + 1);
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auto url = StrPrinter << "rtsp://" << suffix << endl;
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if (user_pwd.find(":") == string::npos) {
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return setup(isSSL, url, user_pwd, "");
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}
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auto user = FindField(user_pwd.data(), nullptr, ":");
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auto pwd = FindField(user_pwd.data(), ":", nullptr);
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return setup(isSSL, url, user, pwd);
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}
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bool RtspUrl::setup(bool isSSL, const string &strUrl, const string &strUser, const string &strPwd) {
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auto ip = FindField(strUrl.data(), "://", "/");
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if (ip.empty()) {
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ip = split(FindField(strUrl.data(), "://", NULL), "?")[0];
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}
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auto port = atoi(FindField(ip.data(), ":", NULL).data());
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if (port <= 0 || port > UINT16_MAX) {
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//rtsp 默认端口554
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port = isSSL ? 322 : 554;
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} else {
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//服务器域名
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ip = FindField(ip.data(), NULL, ":");
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}
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if (ip.empty()) {
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return false;
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}
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_url = std::move(strUrl);
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_user = std::move(strUser);
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_passwd = std::move(strPwd);
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_host = std::move(ip);
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_port = port;
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_is_ssl = isSSL;
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return true;
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}
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static void makeSockPair_l(std::pair<Socket::Ptr, Socket::Ptr> &pair, const string &local_ip){
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auto &pSockRtp = pair.first;
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auto &pSockRtcp = pair.second;
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if (!pSockRtp->bindUdpSock(0, local_ip.data())) {
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//分配端口失败
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throw runtime_error("open udp socket failed");
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}
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//是否是偶数
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bool even_numbers = pSockRtp->get_local_port() % 2 == 0;
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if (!pSockRtcp->bindUdpSock(pSockRtp->get_local_port() + (even_numbers ? 1 : -1), local_ip.data())) {
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//分配端口失败
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throw runtime_error("open udp socket failed");
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}
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if (!even_numbers) {
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//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播放器或服务器
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Socket::Ptr tmp = pSockRtp;
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pSockRtp = pSockRtcp;
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pSockRtcp = tmp;
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}
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}
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void makeSockPair(std::pair<Socket::Ptr, Socket::Ptr> &pair, const string &local_ip){
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int try_count = 0;
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while (true) {
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try {
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makeSockPair_l(pair, local_ip);
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break;
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} catch (...) {
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if (++try_count == 3) {
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throw;
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}
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WarnL << "open udp socket failed, retry: " << try_count;
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}
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}
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}
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string printSSRC(uint32_t ui32Ssrc) {
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char tmp[9] = { 0 };
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ui32Ssrc = htonl(ui32Ssrc);
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uint8_t *pSsrc = (uint8_t *) &ui32Ssrc;
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for (int i = 0; i < 4; i++) {
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sprintf(tmp + 2 * i, "%02X", pSsrc[i]);
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}
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return tmp;
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}
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Buffer::Ptr makeRtpOverTcpPrefix(uint16_t size, uint8_t interleaved){
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auto rtp_tcp = std::make_shared<BufferRaw>(RtpPacket::kRtpTcpHeaderSize);
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rtp_tcp->setSize(RtpPacket::kRtpTcpHeaderSize);
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auto ptr = rtp_tcp->data();
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ptr[0] = '$';
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ptr[1] = interleaved;
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ptr[2] = (size >> 8) & 0xFF;
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ptr[3] = size & 0xFF;
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return rtp_tcp;
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}
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#define AV_RB16(x) \
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((((const uint8_t*)(x))[0] << 8) | \
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((const uint8_t*)(x))[1])
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size_t RtpHeader::getCsrcSize() const {
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//每个csrc占用4字节
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return csrc << 2;
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}
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uint8_t *RtpHeader::getCsrcData() {
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if (!csrc) {
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return nullptr;
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}
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return &payload;
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}
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size_t RtpHeader::getExtSize() const {
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//rtp有ext
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if (!ext) {
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return 0;
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}
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auto ext_ptr = &payload + getCsrcSize();
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uint16_t reserved = AV_RB16(ext_ptr);
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//每个ext占用4字节
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return AV_RB16(ext_ptr + 2) << 2;
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}
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uint8_t *RtpHeader::getExtData() {
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if (!ext) {
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return nullptr;
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}
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auto ext_ptr = &payload + getCsrcSize();
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//多出的4个字节分别为reserved、ext_len
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return ext_ptr + 4 + getExtSize();
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}
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size_t RtpHeader::getPayloadOffset() const {
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//有ext时，还需要忽略reserved、ext_len 4个字节
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return getCsrcSize() + (ext ? (4 + getExtSize()) : 0);
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}
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uint8_t *RtpHeader::getPayloadData() {
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return &payload + getPayloadOffset();
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}
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size_t RtpHeader::getPaddingSize(size_t rtp_size) const {
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if (!padding) {
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return 0;
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}
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auto end = (uint8_t *) this + rtp_size - 1;
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return *end;
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}
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size_t RtpHeader::getPayloadSize(size_t rtp_size) const{
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auto invalid_size = getPayloadOffset() + getPaddingSize(rtp_size);
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if (invalid_size + RtpPacket::kRtpHeaderSize >= rtp_size) {
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return 0;
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}
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return rtp_size - invalid_size - RtpPacket::kRtpHeaderSize;
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}
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string RtpHeader::dumpString(size_t rtp_size) const{
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_StrPrinter printer;
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printer << "version:" << (int)version << "\r\n";
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printer << "padding:" << getPaddingSize(rtp_size) << "\r\n";
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printer << "ext:" << getExtSize() << "\r\n";
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printer << "csrc:" << getCsrcSize() << "\r\n";
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printer << "mark:" << (int)mark << "\r\n";
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printer << "pt:" << (int)pt << "\r\n";
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printer << "seq:" << ntohs(seq) << "\r\n";
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printer << "stamp:" << ntohl(stamp) << "\r\n";
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printer << "ssrc:" << ntohl(ssrc) << "\r\n";
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printer << "rtp size:" << rtp_size << "\r\n";
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printer << "payload offset:" << getPayloadOffset() << "\r\n";
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printer << "payload size:" << getPayloadSize(rtp_size) << "\r\n";
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return std::move(printer);
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}
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///////////////////////////////////////////////////////////////////////
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RtpHeader* RtpPacket::getHeader(){
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//需除去rtcp over tcp 4个字节长度
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return (RtpHeader*)(data() + RtpPacket::kRtpTcpHeaderSize);
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}
|
||
|
||
uint16_t RtpPacket::getSeq(){
|
||
return ntohs(getHeader()->seq);
|
||
}
|
||
|
||
uint32_t RtpPacket::getStampMS(){
|
||
return ntohl(getHeader()->stamp) * uint64_t(1000) / sample_rate;
|
||
}
|
||
|
||
uint32_t RtpPacket::getSSRC(){
|
||
return ntohl(getHeader()->ssrc);
|
||
}
|
||
|
||
uint8_t* RtpPacket::getPayload(){
|
||
return getHeader()->getPayloadData();
|
||
}
|
||
|
||
size_t RtpPacket::getPayloadSize(){
|
||
//需除去rtcp over tcp 4个字节长度
|
||
return getHeader()->getPayloadSize(size() - kRtpTcpHeaderSize);
|
||
}
|
||
|
||
RtpPacket::Ptr RtpPacket::create(){
|
||
#if 0
|
||
static ResourcePool<RtpPacket> packet_pool;
|
||
static onceToken token([]() {
|
||
packet_pool.setSize(1024);
|
||
});
|
||
auto ret = packet_pool.obtain();
|
||
ret->setSize(0);
|
||
return ret;
|
||
#else
|
||
return Ptr(new RtpPacket);
|
||
#endif
|
||
}
|
||
|
||
}//namespace mediakit
|