mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
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93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
//
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// Created by xzl on 2018/10/18.
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//
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#include "H264RtpEncoder.h"
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void H264RtpEncoder::inputFame(const Frame::Ptr &frame, bool key_pos) {
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RtpCodec::inputFame(frame, key_pos);
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GET_CONFIG_AND_REGISTER(uint32_t,cycleMS,Config::Rtp::kCycleMS);
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auto uiStamp = frame->stamp();
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auto pcData = frame->data();
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auto iLen = frame->size();
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uiStamp %= cycleMS;
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int iSize = m_ui32MtuSize - 2;
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if (iLen > iSize) { //超过MTU
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const unsigned char s_e_r_Start = 0x80;
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const unsigned char s_e_r_Mid = 0x00;
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const unsigned char s_e_r_End = 0x40;
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//获取帧头数据，1byte
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unsigned char naluType = *((unsigned char *) pcData) & 0x1f; //获取NALU的5bit 帧类型
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unsigned char nal_ref_idc = *((unsigned char *) pcData) & 0x60; //获取NALU的2bit 帧重要程度 00 可以丢 11不能丢
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//nal_ref_idc = 0x60;
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//组装FU-A帧头数据 2byte
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unsigned char f_nri_type = nal_ref_idc + 28;//F为0 1bit,nri上面获取到2bit,28为FU-A分片类型5bit
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unsigned char s_e_r_type = naluType;
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bool bFirst = true;
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bool mark = false;
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int nOffset = 1;
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while (!mark) {
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if (iLen < nOffset + iSize) { //是否拆分结束
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iSize = iLen - nOffset;
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mark = true;
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s_e_r_type = s_e_r_End + naluType;
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} else {
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if (bFirst == true) {
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s_e_r_type = s_e_r_Start + naluType;
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bFirst = false;
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} else {
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s_e_r_type = s_e_r_Mid + naluType;
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}
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}
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memcpy(m_aucSectionBuf, &f_nri_type, 1);
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memcpy(m_aucSectionBuf + 1, &s_e_r_type, 1);
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memcpy(m_aucSectionBuf + 2, (unsigned char *) pcData + nOffset, iSize);
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nOffset += iSize;
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makeH264Rtp(m_aucSectionBuf, iSize + 2, mark, uiStamp);
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}
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} else {
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makeH264Rtp(pcData, iLen, true, uiStamp);
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}
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}
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void H264RtpEncoder::makeH264Rtp(const void* data, unsigned int len, bool mark, uint32_t uiStamp) {
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uint16_t ui16RtpLen = len + 12;
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m_ui32TimeStamp = (m_ui32SampleRate / 1000) * uiStamp;
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uint32_t ts = htonl(m_ui32TimeStamp);
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uint16_t sq = htons(m_ui16Sequence);
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uint32_t sc = htonl(m_ui32Ssrc);
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auto pRtppkt = obtainRtp();
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auto &rtppkt = *(pRtppkt.get());
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unsigned char *pucRtp = rtppkt.payload;
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pucRtp[0] = '$';
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pucRtp[1] = m_ui8Interleaved;
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pucRtp[2] = ui16RtpLen >> 8;
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pucRtp[3] = ui16RtpLen & 0x00FF;
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pucRtp[4] = 0x80;
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pucRtp[5] = (mark << 7) | m_ui8PlayloadType;
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memcpy(&pucRtp[6], &sq, 2);
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memcpy(&pucRtp[8], &ts, 4);
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//ssrc
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memcpy(&pucRtp[12], &sc, 4);
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//playload
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memcpy(&pucRtp[16], data, len);
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rtppkt.PT = m_ui8PlayloadType;
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rtppkt.interleaved = m_ui8Interleaved;
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rtppkt.mark = mark;
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rtppkt.length = len + 16;
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rtppkt.sequence = m_ui16Sequence;
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rtppkt.timeStamp = m_ui32TimeStamp;
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rtppkt.ssrc = m_ui32Ssrc;
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rtppkt.type = TrackVideo;
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rtppkt.offset = 16;
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uint8_t type = ((uint8_t *) (data))[0] & 0x1F;
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RtpCodec::inputRtp(pRtppkt,type == 5);
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m_ui16Sequence++;
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}
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