mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-02 09:31:34 +08:00
203 lines
6.7 KiB
C++
203 lines
6.7 KiB
C++
//
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// Created by xzl on 2018/10/18.
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//
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#include "H264RtpCodec.h"
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H264RtpDecoder::H264RtpDecoder() {
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m_h264frame = obtainFrame();
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}
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H264Frame::Ptr H264RtpDecoder::obtainFrame() {
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//从缓存池重新申请对象，防止覆盖已经写入环形缓存的对象
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auto frame = m_framePool.obtain();
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frame->buffer.clear();
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frame->iPrefixSize = 4;
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return frame;
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}
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void H264RtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
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RtpCodec::inputRtp(rtp, decodeRtp(rtp));
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}
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bool H264RtpDecoder::decodeRtp(const RtpPacket::Ptr &rtppack) {
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/**
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* h264帧类型
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* Type==1:P/B frame
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* Type==5:IDR 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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*/
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const uint8_t *frame = (uint8_t *) rtppack->payload + rtppack->offset;
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int length = rtppack->length - rtppack->offset;
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NALU nal;
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MakeNalu(*frame, nal);
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if (nal.type >= 0 && nal.type < 24) {
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//a full frame
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m_h264frame->buffer.assign("\x0\x0\x0\x1", 4);
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m_h264frame->buffer.append((char *)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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auto isIDR = m_h264frame->type == 5;
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onGetH264(m_h264frame);
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return (isIDR); //i frame
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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->buffer.assign("\x0\x0\x0\x1", 4);
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m_h264frame->buffer.push_back(tmp);
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m_h264frame->buffer.append((char *)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 == 5); //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->buffer.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->buffer.append((char *)frame + 2, length - 2);
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m_h264frame->timeStamp = rtppack->timeStamp / 90;
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auto isIDR = m_h264frame->type == 5;
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onGetH264(m_h264frame);
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return isIDR;
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}
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//FU-A mid
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m_h264frame->buffer.append((char *)frame + 2, length - 2);
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return false;
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}
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WarnL << "不支持的rtp类型:" << nal.type << " " << rtppack->sequence;
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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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void H264RtpDecoder::onGetH264(const H264Frame::Ptr &frame) {
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//写入环形缓存
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RtpCodec::inputFrame(frame,frame->type == 5);
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m_h264frame = obtainFrame();
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}
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////////////////////////////////////////////////////////////////////////
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H264RtpEncoder::H264RtpEncoder(uint32_t ui32Ssrc,
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uint32_t ui32MtuSize,
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uint32_t ui32SampleRate,
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uint8_t ui8PlayloadType,
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uint8_t ui8Interleaved) :
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RtpInfo(ui32Ssrc,
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ui32MtuSize,
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ui32SampleRate,
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ui8PlayloadType,
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ui8Interleaved) {
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}
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void H264RtpEncoder::inputFrame(const Frame::Ptr &frame, bool key_pos) {
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RtpCodec::inputFrame(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() + frame->prefixSize();
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auto iLen = frame->size() - frame->prefixSize();
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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 rtppkt = obtainRtp();
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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(rtppkt,type == 5);
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m_ui16Sequence++;
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} |