mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-02 17:41:33 +08:00
276 lines
7.0 KiB
C++
276 lines
7.0 KiB
C++
/*
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* RtpPraser.cpp
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*
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* Created on: 2016年9月5日
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* Author: xzl
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*/
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#include <cctype>
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#include <algorithm>
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#include "RtpParser.h"
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#include "Device/base64.h"
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#include "H264/SPSParser.h"
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using namespace std;
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namespace ZL {
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namespace Rtsp {
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static int getTimeInSDP(const string &sdp) {
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auto strRange = FindField(sdp.data(), "a=range:npt=", "\r\n");
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strRange.append(" ");
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auto iPos = strRange.find('-');
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if (iPos == string::npos) {
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return 0;
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}
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auto strStart = strRange.substr(0, iPos);
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auto strEnd = strRange.substr(iPos + 1);
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strEnd.pop_back();
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if (strStart == "now") {
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strStart = "0";
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}
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return atof(strEnd.data()) - atof(strStart.data());
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}
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RtpParser::RtpParser(const string& sdp) {
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RtspTrack tmp[2];
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int cnt = parserSDP(sdp, tmp);
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if (0 == cnt) {
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throw std::runtime_error("解析SDP失败！");
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}
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for (int i = 0; i < cnt; i++) {
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switch (tmp[i].type) {
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case TrackVideo: {
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try {
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onGetVideoTrack(tmp[i]);
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m_bHaveVideo = true;
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m_mapTracks.emplace(tmp[i].PT, tmp[i]);
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} catch (std::exception &ex) {
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WarnL << ex.what();
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}
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}
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break;
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case TrackAudio: {
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try {
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onGetAudioTrack(tmp[i]);
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m_bHaveAudio = true;
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m_mapTracks.emplace(tmp[i].PT, tmp[i]);
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} catch (std::exception &ex) {
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WarnL << ex.what();
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}
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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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if (!m_bHaveVideo && !m_bHaveAudio) {
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throw std::runtime_error("不支持该RTSP媒体格式");
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}
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m_fDuration = getTimeInSDP(sdp);
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}
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RtpParser::~RtpParser() {
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}
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bool RtpParser::inputRtp(const RtpPacket& rtp) {
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auto &track = m_mapTracks[rtp.PT];
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switch (track.type) {
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case TrackVideo:
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if (m_bHaveVideo) {
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return inputVideo(rtp, track);
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}
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return false;
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case TrackAudio:
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if (m_bHaveAudio) {
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return inputAudio(rtp, track);
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}
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return false;
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default:
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return false;
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}
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}
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inline bool RtpParser::inputVideo(const RtpPacket& rtppack,
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const RtspTrack& track) {
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const char *frame = (char *) rtppack.payload + 16;
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int length = rtppack.length - 16;
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NALU nal;
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MakeNalu(*frame, nal);
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//Type==1:P frame
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//Type==6:SEI frame
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//Type==7:SPS frame
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//Type==8:PPS frame
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if (nal.type > 0 && nal.type < 24) {
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//a full frame
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m_h264frame.data.assign("\x0\x0\x0\x1", 4);
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m_h264frame.data.append(frame, length);
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m_h264frame.type = nal.type;
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m_h264frame.timeStamp = rtppack.timeStamp / 90;
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m_h264frame.sequence = rtppack.sequence;
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_onGetH264(m_h264frame);
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m_h264frame.data.clear();
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return (m_h264frame.type == 7);
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}
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if (nal.type == 28) {
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//FU-A
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FU fu;
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MakeFU(frame[1], fu);
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if (fu.S == 1) {
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//FU-A start
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char tmp = (nal.forbidden_zero_bit << 7 | nal.nal_ref_idc << 5 | fu.type);
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m_h264frame.data.assign("\x0\x0\x0\x1", 4);
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m_h264frame.data.push_back(tmp);
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m_h264frame.data.append(frame + 2, length - 2);
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m_h264frame.type = fu.type;
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m_h264frame.timeStamp = rtppack.timeStamp / 90;
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m_h264frame.sequence = rtppack.sequence;
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return (m_h264frame.type == 7); //i frame
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}
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if (rtppack.sequence != (uint16_t)(m_h264frame.sequence + 1)) {
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m_h264frame.data.clear();
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WarnL << "丢包,帧废弃：" << rtppack.sequence << "," << m_h264frame.sequence;
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return false;
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}
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m_h264frame.sequence = rtppack.sequence;
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if (fu.E == 1) {
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//FU-A end
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m_h264frame.data.append(frame + 2, length - 2);
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m_h264frame.timeStamp = rtppack.timeStamp / 90;
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_onGetH264(m_h264frame);
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m_h264frame.data.clear();
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return false;
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}
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//FU-A mid
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m_h264frame.data.append(frame + 2, length - 2);
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return false;
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}
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WarnL << nal.type;
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return false;
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// 29 FU-B 单NAL单元B模式
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// 24 STAP-A 单一时间的组合包
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// 25 STAP-B 单一时间的组合包
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// 26 MTAP16 多个时间的组合包
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// 27 MTAP24 多个时间的组合包
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// 0 udef
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// 30 udef
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// 31 udef
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}
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inline void RtpParser::onGetAudioTrack(const RtspTrack& audio) {
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for (auto &ch : const_cast<string &>(audio.trackSdp)) {
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ch = tolower(ch);
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}
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if (audio.trackSdp.find("mpeg4-generic") == string::npos) {
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throw std::runtime_error("只支持aac格式的音频！");
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}
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string fConfigStr = FindField(audio.trackSdp.c_str(), "config=", "\r\n");
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if (fConfigStr.size() != 4) {
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fConfigStr = FindField(audio.trackSdp.c_str(), "config=", ";");
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}
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if (fConfigStr.size() != 4) {
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throw std::runtime_error("解析aac格式头失败！");
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}
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m_strAudioCfg.clear();
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unsigned int cfg1;
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sscanf(fConfigStr.substr(0, 2).c_str(), "%02X", &cfg1);
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cfg1 &= 0x00FF;
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m_strAudioCfg.push_back(cfg1);
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unsigned int cfg2;
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sscanf(fConfigStr.substr(2, 2).c_str(), "%02X", &cfg2);
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cfg2 &= 0x00FF;
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m_strAudioCfg.push_back(cfg2);
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makeAdtsHeader(m_strAudioCfg,m_adts);
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getAACInfo(m_adts, m_iSampleRate, m_iChannel);
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}
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inline void RtpParser::onGetVideoTrack(const RtspTrack& video) {
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if (video.trackSdp.find("H264") == string::npos) {
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throw std::runtime_error("只支持264格式的视频！");
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}
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string sps_pps = FindField(video.trackSdp.c_str(), "sprop-parameter-sets=", "\r\n");
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string base64_SPS = FindField(sps_pps.c_str(), NULL, ",");
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string base64_PPS = FindField(sps_pps.c_str(), ",", NULL);
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uint8_t SPS_BUF[256], PPS_BUF[256];
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int SPS_LEN = av_base64_decode(SPS_BUF, base64_SPS.c_str(), sizeof(SPS_BUF));
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int PPS_LEN = av_base64_decode(PPS_BUF, base64_PPS.c_str(), sizeof(PPS_BUF));
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m_strSPS.assign("\x00\x00\x00\x01", 4);
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m_strSPS.append((char *) SPS_BUF, SPS_LEN);
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m_strPPS.assign("\x00\x00\x00\x01", 4);
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m_strPPS.append((char *) PPS_BUF, PPS_LEN);
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string strTmp((char *)SPS_BUF, SPS_LEN);
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if (!getAVCInfo(strTmp, m_iVideoWidth, m_iVideoHeight, m_fVideoFps)) {
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throw std::runtime_error("解析SPS失败！");
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}
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}
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inline bool RtpParser::inputAudio(const RtpPacket& rtppack,
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const RtspTrack& track) {
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char *frame = (char *) rtppack.payload + 16;
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int length = rtppack.length - 16;
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if (m_adts.aac_frame_length + length - 4 > sizeof(AdtsFrame::data)) {
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m_adts.aac_frame_length = 7;
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return false;
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}
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memcpy(m_adts.data + m_adts.aac_frame_length, frame + 4, length - 4);
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m_adts.aac_frame_length += (length - 4);
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if (rtppack.mark == true) {
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m_adts.sequence = rtppack.sequence;
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m_adts.timeStamp = rtppack.timeStamp * (1000.0 / m_iSampleRate);
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writeAdtsHeader(m_adts, m_adts.data);
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onGetAdts(m_adts);
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m_adts.aac_frame_length = 7;
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}
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return false;
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}
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inline void RtpParser::_onGetH264(H264Frame& frame) {
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switch (frame.type) {
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case 5: { //I
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H264Frame insertedFrame;
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insertedFrame.type = 7; //SPS
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insertedFrame.timeStamp = frame.timeStamp;
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insertedFrame.data = m_strSPS;
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onGetH264(insertedFrame);
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insertedFrame.type = 8; //PPS
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insertedFrame.timeStamp = frame.timeStamp;
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insertedFrame.data = m_strPPS;
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onGetH264(insertedFrame);
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}
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case 1: //P
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onGetH264(frame);
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break;
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case 7://SPS
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m_strSPS=frame.data;break;
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case 8://PPS
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m_strPPS=frame.data;break;
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default:
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break;
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}
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}
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inline void RtpParser::onGetH264(H264Frame& frame) {
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//frame.timeStamp=ticker0.elapsedTime();
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lock_guard<recursive_mutex> lck(m_mtxCB);
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if (onVideo) {
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onVideo(frame);
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}
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}
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inline void RtpParser::onGetAdts(AdtsFrame& frame) {
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//frame.timeStamp=ticker1.elapsedTime();
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lock_guard<recursive_mutex> lck(m_mtxCB);
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if (onAudio) {
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onAudio(frame);
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}
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}
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} /* namespace Rtsp */
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} /* namespace ZL */
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