mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-27 05:38:31 +08:00
562 lines
17 KiB
C++
562 lines
17 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 <stddef.h>
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#include <assert.h>
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#include "Rtcp.h"
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#include "Util/logger.h"
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namespace mediakit {
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const char *rtcpTypeToStr(RtcpType type){
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switch (type){
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#define SWITCH_CASE(key, value) case RtcpType::key : return #value "(" #key ")";
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RTCP_PT_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default: return "unknown rtcp pt";
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}
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}
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const char *sdesTypeToStr(SdesType type){
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switch (type){
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#define SWITCH_CASE(key, value) case SdesType::key : return #value "(" #key ")";
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SDES_TYPE_MAP(SWITCH_CASE)
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#undef SWITCH_CASE
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default: return "unknown source description type";
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}
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}
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static size_t alignSize(size_t bytes) {
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return (size_t)((bytes + 3) / 4) << 2;
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}
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static void setupHeader(RtcpHeader *rtcp, RtcpType type, size_t report_count, size_t total_bytes) {
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rtcp->version = 2;
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rtcp->padding = 0;
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if (report_count > 0x1F) {
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throw std::invalid_argument(StrPrinter << "rtcp report_count最大赋值为31,当前为:" << report_count);
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}
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//items总个数
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rtcp->report_count = report_count;
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rtcp->pt = (uint8_t) type;
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//不包含rtcp头的长度
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rtcp->length = htons((uint16_t)((total_bytes / 4) - 1));
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}
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/////////////////////////////////////////////////////////////////////////////
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void RtcpHeader::net2Host() {
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length = ntohs(length);
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}
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string RtcpHeader::dumpHeader() const{
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_StrPrinter printer;
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printer << "version:" << version << "\r\n";
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printer << "padding:" << padding << "\r\n";
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printer << "report_count:" << report_count << "\r\n";
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printer << "pt:" << rtcpTypeToStr((RtcpType)pt) << "\r\n";
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printer << "length:" << length << "\r\n";
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printer << "--------\r\n";
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return std::move(printer);
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}
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string RtcpHeader::dumpString() const {
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switch ((RtcpType)pt) {
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case RtcpType::RTCP_SR: {
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RtcpSR *rtcp = (RtcpSR *)this;
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return rtcp->dumpString();
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}
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case RtcpType::RTCP_RR: {
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RtcpRR *rtcp = (RtcpRR *)this;
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return rtcp->dumpString();
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}
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case RtcpType::RTCP_SDES: {
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RtcpSdes *rtcp = (RtcpSdes *)this;
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return rtcp->dumpString();
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}
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case RtcpType::RTCP_PSFB: {
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RtcpPli *rtcp = (RtcpPli *)this;
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return rtcp->dumpString();
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}
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case RtcpType::RTCP_BYE: {
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RtcpBye *rtcp = (RtcpBye *)this;
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return rtcp->dumpString();
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}
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default: return StrPrinter << dumpHeader() << hexdump((char *)this + sizeof(*this), length << 2);
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}
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}
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size_t RtcpHeader::getSize() const {
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return (1 + length) << 2;
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}
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void RtcpHeader::net2Host(size_t len){
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switch ((RtcpType)pt) {
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case RtcpType::RTCP_SR: {
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RtcpSR *sr = (RtcpSR *)this;
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sr->net2Host(len);
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break;
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}
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case RtcpType::RTCP_RR: {
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RtcpRR *rr = (RtcpRR *)this;
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rr->net2Host(len);
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break;
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}
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case RtcpType::RTCP_SDES: {
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RtcpSdes *sdes = (RtcpSdes *)this;
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sdes->net2Host(len);
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break;
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}
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case RtcpType::RTCP_PSFB: {
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RtcpPli *pli = (RtcpPli *)this;
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pli->net2Host(len);
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break;
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}
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case RtcpType::RTCP_BYE: {
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RtcpBye *bye = (RtcpBye *)this;
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bye->net2Host(len);
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break;
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}
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case RtcpType::RTCP_RTPFB: {
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//todo 支持rtcp-fb相关功能
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break;
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}
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default: throw std::runtime_error(StrPrinter << "未处理的rtcp包:" << rtcpTypeToStr((RtcpType) this->pt));
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}
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}
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vector<RtcpHeader *> RtcpHeader::loadFromBytes(char *data, size_t len){
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vector<RtcpHeader *> ret;
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ssize_t remain = len;
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char *ptr = data;
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while (remain > (ssize_t) sizeof(RtcpHeader)) {
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RtcpHeader *rtcp = (RtcpHeader *) ptr;
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auto rtcp_len = (1 + ntohs(rtcp->length)) << 2;
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if (remain < rtcp_len) {
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WarnL << "非法的rtcp包,声明的长度超过实际数据长度";
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break;
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}
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try {
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rtcp->net2Host(rtcp_len);
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ret.emplace_back(rtcp);
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} catch (std::exception &ex) {
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//不能处理的rtcp包，或者无法解析的rtcp包，忽略掉
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WarnL << ex.what() << ",长度为:" << rtcp_len;
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}
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ptr += rtcp_len;
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remain -= rtcp_len;
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}
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return ret;
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}
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class BufferRtcp : public Buffer {
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public:
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BufferRtcp(std::shared_ptr<RtcpHeader> rtcp) {
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_rtcp = std::move(rtcp);
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_size = (ntohs(_rtcp->length) + 1) << 2;
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}
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~BufferRtcp() override {}
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char *data() const override {
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return (char *) _rtcp.get();
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}
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size_t size() const override {
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return _size;
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}
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private:
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std::size_t _size;
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std::shared_ptr<RtcpHeader> _rtcp;
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};
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Buffer::Ptr RtcpHeader::toBuffer(std::shared_ptr<RtcpHeader> rtcp) {
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return std::make_shared<BufferRtcp>(std::move(rtcp));
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}
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/////////////////////////////////////////////////////////////////////////////
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std::shared_ptr<RtcpSR> RtcpSR::create(size_t item_count) {
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auto bytes = alignSize(sizeof(RtcpSR) - sizeof(ReportItem) + item_count * sizeof(ReportItem));
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auto ptr = (RtcpSR *) new char[bytes];
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setupHeader(ptr, RtcpType::RTCP_SR, item_count, bytes);
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return std::shared_ptr<RtcpSR>(ptr, [](RtcpSR *ptr) {
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delete[] (char *) ptr;
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});
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}
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string RtcpSR::getNtpStamp() const{
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struct timeval tv;
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tv.tv_sec = ntpmsw - 0x83AA7E80;
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tv.tv_usec = (decltype(tv.tv_usec))(ntplsw / ((double) (((uint64_t) 1) << 32) * 1.0e-6));
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return LogChannel::printTime(tv);
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}
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void RtcpSR::setNtpStamp(struct timeval tv) {
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ntpmsw = htonl(tv.tv_sec + 0x83AA7E80); /* 0x83AA7E80 is the number of seconds from 1900 to 1970 */
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ntplsw = htonl((uint32_t) ((double) tv.tv_usec * (double) (((uint64_t) 1) << 32) * 1.0e-6));
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}
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string RtcpSR::dumpString() const{
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_StrPrinter printer;
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printer << RtcpHeader::dumpHeader();
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printer << "ssrc:" << ssrc << "\r\n";
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printer << "ntpmsw:" << ntpmsw << "\r\n";
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printer << "ntplsw:" << ntplsw << "\r\n";
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printer << "ntp time:" << getNtpStamp() << "\r\n";
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printer << "rtpts:" << rtpts << "\r\n";
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printer << "packet_count:" << packet_count << "\r\n";
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printer << "octet_count:" << octet_count << "\r\n";
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auto items = ((RtcpSR *)this)->getItemList();
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auto i = 0;
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for (auto &item : items) {
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printer << "---- item:" << i++ << " ----\r\n";
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printer << item->dumpString();
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}
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return std::move(printer);
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}
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#define CHECK_MIN_SIZE(size, kMinSize) \
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if (size < kMinSize) { \
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throw std::out_of_range(StrPrinter << rtcpTypeToStr((RtcpType)pt) << " 长度不足:" << size << " < " << kMinSize); \
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}
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#define CHECK_LENGTH(size, item_count) \
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/*修正个数，防止getItemList时内存越界*/ \
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if (report_count != item_count) { \
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WarnL << rtcpTypeToStr((RtcpType)pt) << " report_count 字段不正确,已修正为:" << (int)report_count << " -> " << item_count; \
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report_count = item_count; \
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} \
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if ((size_t) (length + 1) << 2 != size) { \
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WarnL << rtcpTypeToStr((RtcpType)pt) << " length字段不正确:" << (size_t) (length + 1) << 2 << " != " << size; \
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}
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void RtcpSR::net2Host(size_t size) {
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static const size_t kMinSize = sizeof(RtcpSR) - sizeof(items);
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CHECK_MIN_SIZE(size, kMinSize);
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RtcpHeader::net2Host();
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ssrc = ntohl(ssrc);
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ntpmsw = ntohl(ntpmsw);
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ntplsw = ntohl(ntplsw);
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rtpts = ntohl(rtpts);
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packet_count = ntohl(packet_count);
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octet_count = ntohl(octet_count);
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ReportItem *ptr = &items;
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int item_count = 0;
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for(int i = 0; i < (int)report_count && (char *)(ptr) + sizeof(ReportItem) <= (char *)(this) + size; ++i){
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ptr->net2Host();
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++ptr;
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++item_count;
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}
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CHECK_LENGTH(size, item_count);
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}
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vector<ReportItem*> RtcpSR::getItemList(){
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vector<ReportItem *> ret;
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ReportItem *ptr = &items;
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for (int i = 0; i < (int) report_count; ++i) {
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ret.emplace_back(ptr);
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++ptr;
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}
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return ret;
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}
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/////////////////////////////////////////////////////////////////////////////
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string ReportItem::dumpString() const{
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_StrPrinter printer;
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printer << "ssrc:" << ssrc << "\r\n";
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printer << "fraction:" << fraction << "\r\n";
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printer << "cumulative:" << cumulative << "\r\n";
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printer << "seq_cycles:" << seq_cycles << "\r\n";
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printer << "seq_max:" << seq_max << "\r\n";
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printer << "jitter:" << jitter << "\r\n";
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printer << "last_sr_stamp:" << last_sr_stamp << "\r\n";
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printer << "delay_since_last_sr:" << delay_since_last_sr << "\r\n";
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return std::move(printer);
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}
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void ReportItem::net2Host() {
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ssrc = ntohl(ssrc);
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cumulative = ntohl(cumulative ) >> 8;
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seq_cycles = ntohs(seq_cycles);
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seq_max = ntohs(seq_max);
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jitter = ntohl(jitter);
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last_sr_stamp = ntohl(last_sr_stamp);
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delay_since_last_sr = ntohl(delay_since_last_sr);
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}
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/////////////////////////////////////////////////////////////////////////////
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std::shared_ptr<RtcpRR> RtcpRR::create(size_t item_count) {
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auto bytes = alignSize(sizeof(RtcpRR) - sizeof(ReportItem) + item_count * sizeof(ReportItem));
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auto ptr = (RtcpRR *) new char[bytes];
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setupHeader(ptr, RtcpType::RTCP_RR, item_count, bytes);
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return std::shared_ptr<RtcpRR>(ptr, [](RtcpRR *ptr) {
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delete[] (char *) ptr;
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});
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}
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string RtcpRR::dumpString() const{
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_StrPrinter printer;
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printer << RtcpHeader::dumpHeader();
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printer << "ssrc:" << ssrc << "\r\n";
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auto items = ((RtcpRR *)this)->getItemList();
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auto i = 0;
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for (auto &item : items) {
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printer << "---- item:" << i++ << " ----\r\n";
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printer << item->dumpString();
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}
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return std::move(printer);
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}
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void RtcpRR::net2Host(size_t size) {
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static const size_t kMinSize = sizeof(RtcpRR) - sizeof(items);
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CHECK_MIN_SIZE(size, kMinSize);
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RtcpHeader::net2Host();
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ssrc = ntohl(ssrc);
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ReportItem *ptr = &items;
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int item_count = 0;
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for(int i = 0; i < (int)report_count && (char *)(ptr) + sizeof(ReportItem) <= (char *)(this) + size; ++i){
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ptr->net2Host();
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++ptr;
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++item_count;
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}
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CHECK_LENGTH(size, item_count);
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}
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vector<ReportItem*> RtcpRR::getItemList() {
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vector<ReportItem *> ret;
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ReportItem *ptr = &items;
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for (int i = 0; i < (int) report_count; ++i) {
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ret.emplace_back(ptr);
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++ptr;
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}
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return ret;
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}
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/////////////////////////////////////////////////////////////////////////////
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void SdesItem::net2Host() {
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ssrc = ntohl(ssrc);
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}
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size_t SdesItem::totalBytes() const{
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return alignSize(minSize() + length);
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}
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size_t SdesItem::minSize() {
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return sizeof(SdesItem) - sizeof(text);
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}
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string SdesItem::dumpString() const{
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_StrPrinter printer;
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printer << "ssrc:" << ssrc << "\r\n";
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printer << "type:" << sdesTypeToStr((SdesType) type) << "\r\n";
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printer << "length:" << (int) length << "\r\n";
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printer << "text:" << (length ? string(&text, length) : "") << "\r\n";
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return std::move(printer);
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}
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/////////////////////////////////////////////////////////////////////////////
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std::shared_ptr<RtcpSdes> RtcpSdes::create(const std::initializer_list<string> &item_text) {
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size_t item_total_size = 0;
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for (auto &text : item_text) {
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//统计所有SdesItem对象占用的空间
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item_total_size += alignSize(SdesItem::minSize() + (0xFF & text.size()));
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}
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auto bytes = alignSize(sizeof(RtcpSdes) - sizeof(SdesItem) + item_total_size);
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auto ptr = (RtcpSdes *) new char[bytes];
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auto item_ptr = &ptr->items;
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for (auto &text : item_text) {
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item_ptr->length = (0xFF & text.size());
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//确保赋值\0为RTCP_SDES_END
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memcpy(&(item_ptr->text), text.data(), item_ptr->length + 1);
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item_ptr = (SdesItem *) ((char *) item_ptr + item_ptr->totalBytes());
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}
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setupHeader(ptr, RtcpType::RTCP_SDES, item_text.size(), bytes);
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return std::shared_ptr<RtcpSdes>(ptr, [](RtcpSdes *ptr) {
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delete [] (char *) ptr;
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});
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}
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string RtcpSdes::dumpString() const {
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_StrPrinter printer;
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printer << RtcpHeader::dumpHeader();
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auto items = ((RtcpSdes *)this)->getItemList();
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auto i = 0;
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for (auto &item : items) {
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printer << "---- item:" << i++ << " ----\r\n";
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printer << item->dumpString();
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}
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return std::move(printer);
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}
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void RtcpSdes::net2Host(size_t size) {
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static const size_t kMinSize = sizeof(RtcpSdes) - sizeof(items);
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CHECK_MIN_SIZE(size, kMinSize);
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RtcpHeader::net2Host();
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SdesItem *ptr = &items;
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int item_count = 0;
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for(int i = 0; i < (int)report_count && (char *)(ptr) + SdesItem::minSize() <= (char *)(this) + size; ++i){
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ptr->net2Host();
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ptr = (SdesItem *) ((char *) ptr + ptr->totalBytes());
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++item_count;
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}
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CHECK_LENGTH(size, item_count);
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}
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vector<SdesItem *> RtcpSdes::getItemList() {
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vector<SdesItem *> ret;
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SdesItem *ptr = &items;
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for (int i = 0; i < (int) report_count; ++i) {
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ret.emplace_back(ptr);
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ptr = (SdesItem *) ((char *) ptr + ptr->totalBytes());
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}
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return ret;
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}
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////////////////////////////////////////////////////////////////////
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std::shared_ptr<RtcpPli> RtcpPli::create() {
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auto bytes = alignSize(sizeof(RtcpPli));
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auto ptr = (RtcpRR *) new char[bytes];
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setupHeader(ptr, RtcpType::RTCP_PSFB, 1, bytes);
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return std::shared_ptr<RtcpPli>((RtcpPli *) ptr, [](RtcpPli *ptr) {
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delete[] (char *) ptr;
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});
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}
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string RtcpPli::dumpString() const {
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_StrPrinter printer;
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printer << RtcpHeader::dumpHeader();
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printer << "ssrc:" << ssrc << "\r\n";
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printer << "ssrc_media:" << ssrc_media;
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return std::move(printer);
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}
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void RtcpPli::net2Host(size_t size) {
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static const size_t kMinSize = sizeof(RtcpPli);
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CHECK_MIN_SIZE(size, kMinSize);
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RtcpHeader::net2Host();
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ssrc = ntohl(ssrc);
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ssrc_media = ntohl(ssrc_media);
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}
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////////////////////////////////////////////////////////////////////
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std::shared_ptr<RtcpBye> RtcpBye::create(const std::initializer_list<uint32_t> &ssrcs, const string &reason) {
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assert(reason.size() <= 0xFF);
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auto bytes = alignSize(sizeof(RtcpHeader) + sizeof(uint32_t) * ssrcs.size() + 1 + reason.size());
|
||
auto ptr = (RtcpBye *) new char[bytes];
|
||
setupHeader(ptr, RtcpType::RTCP_BYE, ssrcs.size(), bytes);
|
||
|
||
auto *ssrc_ptr = &(((RtcpBye *) ptr)->ssrc);
|
||
for (auto ssrc : ssrcs) {
|
||
*ssrc_ptr = htonl(ssrc);
|
||
++ssrc_ptr;
|
||
}
|
||
|
||
if (!reason.empty()) {
|
||
uint8_t *reason_len_ptr = (uint8_t *) ptr + sizeof(RtcpHeader) + sizeof(uint32_t) * ssrcs.size();
|
||
*reason_len_ptr = reason.size() & 0xFF;
|
||
memcpy(reason_len_ptr + 1, reason.data(), *reason_len_ptr);
|
||
}
|
||
|
||
return std::shared_ptr<RtcpBye>(ptr, [](RtcpBye *ptr) {
|
||
delete[] (char *) ptr;
|
||
});
|
||
}
|
||
|
||
vector<uint32_t *> RtcpBye::getSSRC() {
|
||
vector<uint32_t *> ret;
|
||
uint32_t *ssrc_ptr = &ssrc;
|
||
for (size_t i = 0; i < report_count; ++i) {
|
||
ret.emplace_back(ssrc_ptr);
|
||
ssrc_ptr += 1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
string RtcpBye::getReason() const {
|
||
auto *reason_len_ptr = &reason_len + sizeof(ssrc) * (report_count - 1);
|
||
if (reason_len_ptr + 1 >= (uint8_t *) this + getSize()) {
|
||
return "";
|
||
}
|
||
return string((char *) reason_len_ptr + 1, *reason_len_ptr);
|
||
}
|
||
|
||
string RtcpBye::dumpString() const {
|
||
_StrPrinter printer;
|
||
printer << RtcpHeader::dumpHeader();
|
||
for(auto ssrc : ((RtcpBye *)this)->getSSRC()) {
|
||
printer << "ssrc:" << *ssrc << "\r\n";
|
||
}
|
||
printer << "reason:" << getReason();
|
||
return std::move(printer);
|
||
}
|
||
|
||
void RtcpBye::net2Host(size_t size) {
|
||
static const size_t kMinSize = sizeof(RtcpHeader);
|
||
CHECK_MIN_SIZE(size, kMinSize);
|
||
RtcpHeader::net2Host();
|
||
|
||
uint32_t *ssrc_ptr = &ssrc;
|
||
size_t offset = kMinSize;
|
||
size_t i = 0;
|
||
for (; i < report_count && offset + sizeof(ssrc) <= size; ++i) {
|
||
*ssrc_ptr = ntohl(*ssrc_ptr);
|
||
ssrc_ptr += 1;
|
||
offset += sizeof(ssrc);
|
||
}
|
||
//修正ssrc个数
|
||
CHECK_LENGTH(size, i);
|
||
|
||
if (offset < size) {
|
||
uint8_t *reason_len_ptr = &reason_len + sizeof(ssrc) * (report_count - 1);
|
||
if (reason_len_ptr + 1 + *reason_len_ptr > (uint8_t *) this + size) {
|
||
WarnL << "invalid rtcp bye reason length";
|
||
//修正reason_len长度
|
||
*reason_len_ptr = ((uint8_t *) this + size - reason_len_ptr - 1) & 0xFF;
|
||
}
|
||
}
|
||
}
|
||
|
||
#if 0
|
||
#include "Util/onceToken.h"
|
||
|
||
static toolkit::onceToken token([](){
|
||
auto bye = RtcpBye::create({1,2,3,4,5,6}, "this is a bye reason");
|
||
auto buffer = RtcpHeader::toBuffer(bye);
|
||
|
||
auto rtcps = RtcpHeader::loadFromBytes(buffer->data(), buffer->size());
|
||
for(auto rtcp : rtcps){
|
||
std::cout << rtcp->dumpString() << std::endl;
|
||
}
|
||
});
|
||
#endif
|
||
|
||
}//namespace mediakit
|