mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-02 01:21:33 +08:00
269 lines
9.2 KiB
C++
269 lines
9.2 KiB
C++
/*
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* MIT License
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*
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* Copyright (c) 2016 xiongziliang <771730766@qq.com>
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* Copyright (c) 2019 火宣 <459502659@qq.com>
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*
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* This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "H264RtpCodec.h"
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namespace mediakit{
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typedef struct {
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unsigned forbidden_zero_bit :1;
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unsigned nal_ref_idc :2;
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unsigned type :5;
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} NALU;
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typedef struct {
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unsigned S :1;
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unsigned E :1;
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unsigned R :1;
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unsigned type :5;
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} FU;
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static bool MakeNalu(uint8_t in, NALU &nal) {
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nal.forbidden_zero_bit = in >> 7;
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if (nal.forbidden_zero_bit) {
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return false;
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}
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nal.nal_ref_idc = (in & 0x60) >> 5;
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nal.type = in & 0x1f;
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return true;
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}
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static bool MakeFU(uint8_t in, FU &fu) {
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fu.S = in >> 7;
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fu.E = (in >> 6) & 0x01;
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fu.R = (in >> 5) & 0x01;
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fu.type = in & 0x1f;
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if (fu.R != 0) {
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return false;
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}
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return true;
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}
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H264RtpDecoder::H264RtpDecoder() {
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_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 = ResourcePoolHelper<H264Frame>::obtainObj();
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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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bool H264RtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
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key_pos = decodeRtp(rtp);
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RtpCodec::inputRtp(rtp, key_pos);
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return key_pos;
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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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_h264frame->buffer.assign("\x0\x0\x0\x1", 4);
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_h264frame->buffer.append((char *)frame, length);
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_h264frame->type = nal.type;
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_h264frame->timeStamp = rtppack->timeStamp;
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_h264frame->sequence = rtppack->sequence;
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auto isIDR = _h264frame->type == H264Frame::NAL_IDR;
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onGetH264(_h264frame);
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return (isIDR); //i frame
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}
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switch (nal.type){
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case 24:{
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// 24 STAP-A 单一时间的组合包
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bool haveIDR = false;
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auto ptr = frame + 1;
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while(true){
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int off = ptr - frame;
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if (off >= length) {
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break;
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}
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//获取当前nalu的大小
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uint16_t len = *ptr++;
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len <<= 8;
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len |= *ptr++;
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if (off + len > length) {
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break;
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}
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if(len >= 10){
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//过小的帧丢弃
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NALU nal;
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MakeNalu(ptr[0], nal);
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_h264frame->buffer.assign("\x0\x0\x0\x1", 4);
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_h264frame->buffer.append((char *)ptr, len);
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_h264frame->type = nal.type;
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_h264frame->timeStamp = rtppack->timeStamp;
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_h264frame->sequence = rtppack->sequence;
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if(nal.type == H264Frame::NAL_IDR){
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haveIDR = true;
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}
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onGetH264(_h264frame);
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}
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ptr += len;
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}
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return haveIDR;
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}
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case 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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_h264frame->buffer.assign("\x0\x0\x0\x1", 4);
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_h264frame->buffer.push_back(tmp);
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_h264frame->buffer.append((char *)frame + 2, length - 2);
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_h264frame->type = fu.type;
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_h264frame->timeStamp = rtppack->timeStamp;
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_h264frame->sequence = rtppack->sequence;
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return (_h264frame->type == H264Frame::NAL_IDR); //i frame
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}
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if (rtppack->sequence != (uint16_t)(_h264frame->sequence + 1)) {
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_h264frame->buffer.clear();
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WarnL << "丢包,帧废弃:" << rtppack->sequence << "," << _h264frame->sequence;
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return false;
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}
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_h264frame->sequence = rtppack->sequence;
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if (fu.E == 1) {
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//FU-A end
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_h264frame->buffer.append((char *)frame + 2, length - 2);
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_h264frame->timeStamp = rtppack->timeStamp;
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auto isIDR = _h264frame->type == H264Frame::NAL_IDR;
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onGetH264(_h264frame);
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return isIDR;
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}
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//FU-A mid
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_h264frame->buffer.append((char *)frame + 2, length - 2);
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return false;
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}
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default:{
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// 29 FU-B 单NAL单元B模式
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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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WarnL << "不支持的rtp类型:" << (int)nal.type << " " << rtppack->sequence;
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return false;
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}
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}
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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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auto lastSeq = _h264frame->sequence;
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RtpCodec::inputFrame(frame);
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_h264frame = obtainFrame();
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_h264frame->sequence = lastSeq;
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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) {
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RtpCodec::inputFrame(frame);
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GET_CONFIG_AND_REGISTER(uint32_t,cycleMS,Rtp::kCycleMS);
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auto pcData = frame->data() + frame->prefixSize();
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auto uiStamp = frame->stamp();
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auto iLen = frame->size() - frame->prefixSize();
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unsigned char naluType = H264_TYPE(pcData[0]); //获取NALU的5bit 帧类型
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uiStamp %= cycleMS;
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int iSize = _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 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 if (bFirst) {
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s_e_r_type = s_e_r_Start + naluType;
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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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memcpy(_aucSectionBuf, &f_nri_type, 1);
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memcpy(_aucSectionBuf + 1, &s_e_r_type, 1);
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memcpy(_aucSectionBuf + 2, (unsigned char *) pcData + nOffset, iSize);
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nOffset += iSize;
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makeH264Rtp(naluType,_aucSectionBuf, iSize + 2, mark,bFirst, uiStamp);
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bFirst = false;
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}
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} else {
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makeH264Rtp(naluType,pcData, iLen, true, true, uiStamp);
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}
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}
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void H264RtpEncoder::makeH264Rtp(int nal_type,const void* data, unsigned int len, bool mark, bool first_packet, uint32_t uiStamp) {
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RtpCodec::inputRtp(makeRtp(getTrackType(),data,len,mark,uiStamp),first_packet && nal_type == H264Frame::NAL_IDR);
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}
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}//namespace mediakit
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