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fix webrtc h264 rtp Packetizer error

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This commit is contained in:
xgj 2021-04-15 00:15:41 +08:00
parent 29c8c9bf26
commit 6e4dfaf53f
2 changed files with 46 additions and 3 deletions
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47
src/Extension/H264Rtp.cpp
View File

@ -189,8 +189,41 @@ void H264RtpEncoder::inputFrame(const Frame::Ptr &frame) {
auto len = frame->size() - frame->prefixSize();
auto pts = frame->pts();
auto nal_type = H264_TYPE(ptr[0]);
auto packet_size = getMaxSize() - 2;
if(nal_type == H264Frame::NAL_SEI || nal_type == H264Frame::NAL_AUD){
return;
}
if(nal_type == H264Frame::NAL_SPS){
_sps = std::string(ptr,len);
return;
}
if(nal_type == H264Frame::NAL_PPS){
_pps = std::string(ptr,len);
return;
}
if(nal_type == H264Frame::NAL_IDR)
{// 保证每一个I帧前都有SPS与PPS ,为了兼容webrtc 需要在一个rtp包中，并且只能是 STAP-A
// https://blog.csdn.net/momo0853/article/details/88872873
auto rtp = makeRtp(getTrackType(), nullptr,_sps.size()+_pps.size()+2*2+1,true,pts);
uint8_t *payload = rtp->getPayload();
payload[0] = 24;
payload[1] = _sps.size() >> 8;
payload[2] = _sps.size() & 0xff;
memcpy(payload+3,(uint8_t *) _sps.data(),_sps.size());
payload[_sps.size()+3] = _pps.size() >> 8;
payload[_sps.size()+4] = _pps.size() & 0xff;
memcpy(payload+3+_sps.size()+2,(uint8_t *) _pps.data(),_pps.size());
RtpCodec::inputRtp(rtp,true);
}
auto packet_size = getMaxSize() - 2;
//InfoL<<"nal type = "<<nal_type<<" pts="<<pts<<" len="<<len;
//末尾5bit为nalu type，固定为28(FU-A)
auto fu_char_0 = (ptr[0] & (~0x1F)) | 28;
auto fu_char_1 = nal_type;
@ -218,14 +251,22 @@ void H264RtpEncoder::inputFrame(const Frame::Ptr &frame) {
//H264 数据
memcpy(payload + 2, (uint8_t *) ptr + offset, packet_size);
//输入到rtp环形缓存
RtpCodec::inputRtp(rtp, fu_flags->start_bit && nal_type == H264Frame::NAL_IDR);
RtpCodec::inputRtp(rtp, false);
offset += packet_size;
fu_flags->start_bit = 0;
}
} else {
//如果帧长度不超过mtu, 则按照Single NAL unit packet per H.264 方式打包
makeH264Rtp(ptr, len, false, false, pts);
//为了兼容性 webrtc使用 STAP-A 打包
auto rtp = makeRtp(getTrackType(), nullptr,len+3,true,pts);
uint8_t *payload = rtp->getPayload();
payload[0] = (ptr[0] & (~0x1F)) | 24;
payload[1] = len >> 8;
payload[2] = len & 0xff;
memcpy(payload+3,(uint8_t *) ptr,len);
RtpCodec::inputRtp(rtp,false);
//makeH264Rtp(ptr, len, false, false, pts);
}
}

2
src/Extension/H264Rtp.h
View File

@ -83,6 +83,8 @@ public:
private:
void makeH264Rtp(const void *pData, size_t uiLen, bool bMark, bool gop_pos, uint32_t uiStamp);
string _sps;
string _pps;
};
}//namespace mediakit{