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102 lines
2.1 KiB
C++
102 lines
2.1 KiB
C++
//
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// H264Parser.cpp
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// MediaPlayer
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//
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// Created by xzl on 2017/1/16.
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// Copyright © 2017年 jizan. All rights reserved.
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//
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#include "H264Parser.h"
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#include "Util/logger.h"
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using namespace ZL::Util;
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H264Parser::H264Parser(){
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}
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H264Parser::~H264Parser(){
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}
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void H264Parser::inputH264(const string &h264,uint32_t dts){
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m_parser.SetStream((const uint8_t *)h264.data(), h264.size());
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while (true) {
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if(media::H264Parser::kOk != m_parser.AdvanceToNextNALU(&m_nalu)){
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break;
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}
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switch (m_nalu.nal_unit_type) {
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case media::H264NALU::kNonIDRSlice:
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case media::H264NALU::kIDRSlice:{
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if(media::H264Parser::kOk == m_parser.ParseSliceHeader(m_nalu, &m_shdr)){
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const media::H264SPS *pPps = m_parser.GetSPS(m_shdr.pic_parameter_set_id);
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if (pPps) {
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m_poc.ComputePicOrderCnt(pPps, m_shdr, &m_iNowPOC);
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computePts(dts);
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}
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}
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}
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break;
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case media::H264NALU::kSPS:{
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int sps_id;
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m_parser.ParseSPS(&sps_id);
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}
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break;
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case media::H264NALU::kPPS:{
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int pps_id;
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m_parser.ParsePPS(&pps_id);
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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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}
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void H264Parser::computePts(uint32_t iNowDTS) {
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auto iPOCInc = m_iNowPOC - m_iLastPOC;
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if (m_shdr.slice_type % 5 == 1) {
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//这是B帧
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m_iNowPTS = m_iLastPTS + m_iMsPerPOC * (iPOCInc);
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} else {
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//这是I帧或者P帧
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m_iNowPTS = iNowDTS;
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//计算每一POC的时间
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if(iPOCInc == 0){
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WarnL << "iPOCInc = 0," << m_iNowPOC << " " << m_iLastPOC;
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}else{
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m_iMsPerPOC = (m_iNowPTS - m_iLastPTS) / iPOCInc;
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}
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m_iLastPTS = m_iNowPTS;
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m_iLastPOC = m_iNowPOC;
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}
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// DebugL << m_shdr.slice_type
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// <<"\r\nNOW:"
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// << m_iNowPOC << " "
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// << m_iNowPTS << " "
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// << iNowDTS << " "
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// << "\r\nLST:"
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// << m_iLastPOC << " "
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// << m_iLastPTS << " "
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// << m_iMsPerPOC << endl;
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}
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