mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-29 22:55:52 +08:00
239 lines
7.2 KiB
C++
239 lines
7.2 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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*
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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 "H264RtmpCodec.h"
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namespace mediakit{
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H264RtmpDecoder::H264RtmpDecoder() {
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_h264frame = obtainFrame();
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}
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H264Frame::Ptr H264RtmpDecoder::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 = 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 H264RtmpDecoder::inputRtmp(const RtmpPacket::Ptr &rtmp, bool key_pos) {
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key_pos = decodeRtmp(rtmp);
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RtmpCodec::inputRtmp(rtmp, key_pos);
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return key_pos;
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}
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bool H264RtmpDecoder::decodeRtmp(const RtmpPacket::Ptr &pkt) {
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if (pkt->isCfgFrame()) {
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//缓存sps pps，后续插入到I帧之前
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_sps = pkt->getH264SPS();
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_pps = pkt->getH264PPS();
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return false;
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}
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if (_sps.size()) {
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uint32_t iTotalLen = pkt->strBuf.size();
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uint32_t iOffset = 5;
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while(iOffset + 4 < iTotalLen){
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uint32_t iFrameLen;
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memcpy(&iFrameLen, pkt->strBuf.data() + iOffset, 4);
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iFrameLen = ntohl(iFrameLen);
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iOffset += 4;
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if(iFrameLen + iOffset > iTotalLen){
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break;
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}
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onGetH264_l(pkt->strBuf.data() + iOffset, iFrameLen, pkt->timeStamp);
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iOffset += iFrameLen;
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}
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}
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return pkt->isVideoKeyFrame();
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}
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inline void H264RtmpDecoder::onGetH264_l(const char* pcData, int iLen, uint32_t ui32TimeStamp) {
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switch (pcData[0] & 0x1F) {
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case 5: {
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//I frame
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onGetH264(_sps.data(), _sps.length(), ui32TimeStamp);
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onGetH264(_pps.data(), _pps.length(), ui32TimeStamp);
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}
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case 1: {
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//I or P or B frame
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onGetH264(pcData, iLen, ui32TimeStamp);
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}
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break;
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default:
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//WarnL <<(int)(pcData[0] & 0x1F);
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break;
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}
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}
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inline void H264RtmpDecoder::onGetH264(const char* pcData, int iLen, uint32_t ui32TimeStamp) {
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_h264frame->type = pcData[0] & 0x1F;
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_h264frame->timeStamp = ui32TimeStamp;
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_h264frame->buffer.assign("\x0\x0\x0\x1", 4); //添加264头
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_h264frame->buffer.append(pcData, iLen);
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//写入环形缓存
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RtmpCodec::inputFrame(_h264frame);
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_h264frame = obtainFrame();
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}
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////////////////////////////////////////////////////////////////////////
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H264RtmpEncoder::H264RtmpEncoder(const Track::Ptr &track) {
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_track = dynamic_pointer_cast<H264Track>(track);
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}
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void H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
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RtmpCodec::inputFrame(frame);
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auto pcData = frame->data() + frame->prefixSize();
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auto iLen = frame->size() - frame->prefixSize();
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auto type = ((uint8_t*)pcData)[0] & 0x1F;
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if(!_gotSpsPps){
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//尝试从frame中获取sps pps
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switch (type){
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case 7:{
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//sps
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if(_sps.empty()){
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_sps = string(pcData,iLen);
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if(!_pps.empty()){
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makeVideoConfigPkt();
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}
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}
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}
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break;
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case 8:{
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//pps
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if(_pps.empty()){
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_pps = string(pcData,iLen);
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if(!_sps.empty()){
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makeVideoConfigPkt();
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}
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}
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}
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break;
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default:
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break;
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}
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//尝试从track中获取sps pps信息
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if((!_sps.empty() || !_pps.empty()) && _track && _track->ready()){
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_sps = _track->getSps();
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_pps = _track->getPps();
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makeVideoConfigPkt();
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}
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}
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switch (type){
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case 5:
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case 1:{
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//I or P or B frame
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int8_t flags = 7; //h.264
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bool is_config = false;
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bool keyFrame = frame->keyFrame();
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flags |= ((keyFrame ? FLV_KEY_FRAME : FLV_INTER_FRAME) << 4);
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RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
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rtmpPkt->strBuf.clear();
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rtmpPkt->strBuf.push_back(flags);
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rtmpPkt->strBuf.push_back(!is_config);
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rtmpPkt->strBuf.append("\x0\x0\x0", 3);
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auto size = htonl(iLen);
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rtmpPkt->strBuf.append((char *) &size, 4);
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rtmpPkt->strBuf.append(pcData, iLen);
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rtmpPkt->bodySize = rtmpPkt->strBuf.size();
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rtmpPkt->chunkId = CHUNK_VIDEO;
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rtmpPkt->streamId = STREAM_MEDIA;
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rtmpPkt->timeStamp = frame->stamp();
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rtmpPkt->typeId = MSG_VIDEO;
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RtmpCodec::inputRtmp(rtmpPkt,keyFrame);
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}
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break;
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default:
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break;
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}
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}
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void H264RtmpEncoder::makeVideoConfigPkt() {
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_gotSpsPps = true;
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int8_t flags = 7; //h.264
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flags |= (FLV_KEY_FRAME << 4);
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bool is_config = true;
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RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
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rtmpPkt->strBuf.clear();
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//////////header
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rtmpPkt->strBuf.push_back(flags);
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rtmpPkt->strBuf.push_back(!is_config);
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rtmpPkt->strBuf.append("\x0\x0\x0", 3);
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////////////sps
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rtmpPkt->strBuf.push_back(1); // version
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//DebugL<<hexdump(_sps.data(), _sps.size());
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rtmpPkt->strBuf.push_back(_sps[1]); // profile
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rtmpPkt->strBuf.push_back(_sps[2]); // compat
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rtmpPkt->strBuf.push_back(_sps[3]); // level
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rtmpPkt->strBuf.push_back(0xff); // 6 bits reserved + 2 bits nal size length - 1 (11)
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rtmpPkt->strBuf.push_back(0xe1); // 3 bits reserved + 5 bits number of sps (00001)
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uint16_t size = _sps.size();
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size = htons(size);
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rtmpPkt->strBuf.append((char *) &size, 2);
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rtmpPkt->strBuf.append(_sps);
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/////////////pps
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rtmpPkt->strBuf.push_back(1); // version
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size = _pps.size();
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size = htons(size);
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rtmpPkt->strBuf.append((char *) &size, 2);
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rtmpPkt->strBuf.append(_pps);
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rtmpPkt->bodySize = rtmpPkt->strBuf.size();
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rtmpPkt->chunkId = CHUNK_VIDEO;
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rtmpPkt->streamId = STREAM_MEDIA;
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rtmpPkt->timeStamp = 0;
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rtmpPkt->typeId = MSG_VIDEO;
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RtmpCodec::inputRtmp(rtmpPkt, false);
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}
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}//namespace mediakit
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