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https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-22 19:00:01 +08:00
调整264 rtp打包逻辑
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xia-chu
parent
9d385b36fd
commit
d76c38ef72
@ -184,107 +184,110 @@ H264RtpEncoder::H264RtpEncoder(uint32_t ssrc, uint32_t mtu, uint32_t sample_rate
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: RtpInfo(ssrc, mtu, sample_rate, pt, interleaved) {
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}
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void H264RtpEncoder::inputFrame(const Frame::Ptr &frame) {
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auto ptr = frame->data() + frame->prefixSize();
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auto len = frame->size() - frame->prefixSize();
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auto pts = frame->pts();
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auto nal_type = H264_TYPE(ptr[0]);
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if(nal_type == H264Frame::NAL_SEI || nal_type == H264Frame::NAL_AUD){
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void H264RtpEncoder::insertConfigFrame(uint32_t pts){
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if (_sps.empty() || _pps.empty()) {
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return;
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}
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//gop缓存从sps开始，sps、pps后面还有时间戳相同的关键帧，所以mark bit为false
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packRtp(_sps.data(), _sps.size(), pts, false, true);
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packRtp(_pps.data(), _pps.size(), pts, false, false);
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}
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if(nal_type == H264Frame::NAL_SPS){
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_sps = std::string(ptr,len);
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return;
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void H264RtpEncoder::packRtp(const char *ptr, size_t len, uint32_t pts, bool is_mark, bool gop_pos){
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if (len + 3 <= getMaxSize()) {
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//STAP-A模式打包小于MTU
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packRtpStapA(ptr, len, pts, is_mark, gop_pos);
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} else {
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//STAP-A模式打包会大于MTU,所以采用FU-A模式
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packRtpFu(ptr, len, pts, is_mark, gop_pos);
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}
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}
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if(nal_type == H264Frame::NAL_PPS){
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_pps = std::string(ptr,len);
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return;
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}
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if(!_last_frame){
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_last_frame = frame;
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return;
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}
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// 上一帧打包，保证rtp 的mark是正确的
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bool isMark = _last_frame->pts() != frame->pts();
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ptr = _last_frame->data() + _last_frame->prefixSize();
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len = _last_frame->size() - _last_frame->prefixSize();
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pts = _last_frame->pts();
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nal_type = H264_TYPE(ptr[0]);
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if(nal_type == H264Frame::NAL_IDR && (ptr[1]&0x80))
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{// 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
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// https://blog.csdn.net/momo0853/article/details/88872873
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// 多slice 一帧的情况下检查 first_mb_in_slice 是否为0 表示其为一帧的开始，SPS PPS 只有在帧开始时，才插入
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auto rtp = makeRtp(getTrackType(), nullptr,_sps.size()+_pps.size()+2*2+1,false,pts);
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uint8_t *payload = rtp->getPayload();
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payload[0] = 24;
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payload[1] = _sps.size() >> 8;
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payload[2] = _sps.size() & 0xff;
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memcpy(payload+3,(uint8_t *) _sps.data(),_sps.size());
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payload[_sps.size()+3] = _pps.size() >> 8;
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payload[_sps.size()+4] = _pps.size() & 0xff;
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memcpy(payload+3+_sps.size()+2,(uint8_t *) _pps.data(),_pps.size());
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RtpCodec::inputRtp(rtp,true);
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}
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void H264RtpEncoder::packRtpFu(const char *ptr, size_t len, uint32_t pts, bool is_mark, bool gop_pos){
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auto packet_size = getMaxSize() - 2;
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//InfoL<<"nal type = "<<nal_type<<" pts="<<pts<<" len="<<len;
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if (len <= packet_size) {
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//小于FU-A打包最小字节长度要求，采用STAP-A模式，如果frame长度正好是mtu-2, 那么打包的rtp长度是mtu + 1
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packRtpStapA(ptr, len, pts, is_mark, gop_pos);
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return;
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}
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//末尾5bit为nalu type，固定为28(FU-A)
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auto fu_char_0 = (ptr[0] & (~0x1F)) | 28;
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auto fu_char_1 = nal_type;
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auto fu_char_1 = H264_TYPE(ptr[0]);
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FuFlags *fu_flags = (FuFlags *) (&fu_char_1);
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fu_flags->start_bit = 1;
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//超过MTU则按照FU-A模式打包
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if (len > packet_size + 1) {
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size_t offset = 1;
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while (!fu_flags->end_bit) {
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if (!fu_flags->start_bit && len <= offset + packet_size) {
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//FU-A end
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packet_size = len - offset;
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fu_flags->end_bit = 1;
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}
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//传入nullptr先不做payload的内存拷贝
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auto rtp = makeRtp(getTrackType(), nullptr, packet_size + 2, fu_flags->end_bit && isMark, pts);
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//rtp payload 负载部分
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uint8_t *payload = rtp->getPayload();
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//FU-A 第1个字节
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payload[0] = fu_char_0;
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//FU-A 第2个字节
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payload[1] = fu_char_1;
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//H264 数据
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memcpy(payload + 2, (uint8_t *) ptr + offset, packet_size);
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//输入到rtp环形缓存
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RtpCodec::inputRtp(rtp, false);
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offset += packet_size;
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fu_flags->start_bit = 0;
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size_t offset = 1;
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while (!fu_flags->end_bit) {
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if (!fu_flags->start_bit && len <= offset + packet_size) {
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//FU-A end
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packet_size = len - offset;
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fu_flags->end_bit = 1;
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}
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} else {
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//如果帧长度不超过mtu, 则按照Single NAL unit packet per H.264 方式打包
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//为了兼容性 webrtc使用 STAP-A 打包
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auto rtp = makeRtp(getTrackType(), nullptr,len+3,isMark,pts);
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uint8_t *payload = rtp->getPayload();
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payload[0] = (ptr[0] & (~0x1F)) | 24;
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payload[1] = len >> 8;
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payload[2] = len & 0xff;
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memcpy(payload+3,(uint8_t *) ptr,len);
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RtpCodec::inputRtp(rtp,false);
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//makeH264Rtp(ptr, len, false, false, pts);
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}
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_last_frame = frame;
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//传入nullptr先不做payload的内存拷贝
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auto rtp = makeRtp(getTrackType(), nullptr, packet_size + 2, fu_flags->end_bit && is_mark, pts);
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//rtp payload 负载部分
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uint8_t *payload = rtp->getPayload();
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//FU-A 第1个字节
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payload[0] = fu_char_0;
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//FU-A 第2个字节
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payload[1] = fu_char_1;
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//H264 数据
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memcpy(payload + 2, (uint8_t *) ptr + offset, packet_size);
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//输入到rtp环形缓存
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RtpCodec::inputRtp(rtp, gop_pos);
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offset += packet_size;
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fu_flags->start_bit = 0;
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}
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}
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void H264RtpEncoder::makeH264Rtp(const void* data, size_t len, bool mark, bool gop_pos, uint32_t uiStamp) {
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RtpCodec::inputRtp(makeRtp(getTrackType(), data, len, mark, uiStamp), gop_pos);
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void H264RtpEncoder::packRtpStapA(const char *ptr, size_t len, uint32_t pts, bool is_mark, bool gop_pos){
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//如果帧长度不超过mtu,为了兼容性 webrtc，采用STAP-A模式打包
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auto rtp = makeRtp(getTrackType(), nullptr, len + 3, is_mark, pts);
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uint8_t *payload = rtp->getPayload();
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//STAP-A
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payload[0] = (ptr[0] & (~0x1F)) | 24;
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payload[1] = (len >> 8) & 0xFF;
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payload[2] = len & 0xff;
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memcpy(payload + 3, (uint8_t *) ptr, len);
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RtpCodec::inputRtp(rtp, gop_pos);
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}
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void H264RtpEncoder::inputFrame(const Frame::Ptr &frame) {
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auto ptr = frame->data() + frame->prefixSize();
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auto len = frame->size() - frame->prefixSize();
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switch (H264_TYPE(ptr[0])) {
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case H264Frame::NAL_AUD:
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case H264Frame::NAL_SEI : {
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return;
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}
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case H264Frame::NAL_SPS: {
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_sps = std::string(ptr, len);
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return;
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}
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case H264Frame::NAL_PPS: {
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_pps = std::string(ptr, len);
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return;
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}
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default: break;
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}
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if (_last_frame) {
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//如果时间戳发生了变化，那么markbit才置true
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inputFrame_l(_last_frame, _last_frame->pts() != frame->pts());
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}
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_last_frame = Frame::getCacheAbleFrame(frame);
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}
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void H264RtpEncoder::inputFrame_l(const Frame::Ptr &frame, bool is_mark){
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if (frame->keyFrame()) {
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//保证每一个关键帧前都有SPS与PPS
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insertConfigFrame(frame->pts());
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}
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packRtp(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize(), frame->pts(), is_mark, false);
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}
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}//namespace mediakit
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@ -82,7 +82,13 @@ public:
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void inputFrame(const Frame::Ptr &frame) override;
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private:
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void makeH264Rtp(const void *pData, size_t uiLen, bool bMark, bool gop_pos, uint32_t uiStamp);
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void insertConfigFrame(uint32_t pts);
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void inputFrame_l(const Frame::Ptr &frame, bool is_mark);
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void packRtp(const char *data, size_t len, uint32_t pts, bool is_mark, bool gop_pos);
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void packRtpFu(const char *data, size_t len, uint32_t pts, bool is_mark, bool gop_pos);
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void packRtpStapA(const char *data, size_t len, uint32_t pts, bool is_mark, bool gop_pos);
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private:
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string _sps;
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string _pps;
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Frame::Ptr _last_frame;
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