/* * MIT License * * Copyright (c) 2016 xiongziliang <771730766@qq.com> * * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit). * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "H264RtmpCodec.h" namespace mediakit{ H264RtmpDecoder::H264RtmpDecoder() { _h264frame = obtainFrame(); } H264Frame::Ptr H264RtmpDecoder::obtainFrame() { //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 auto frame = obtainObj(); frame->buffer.clear(); frame->iPrefixSize = 4; return frame; } bool H264RtmpDecoder::inputRtmp(const RtmpPacket::Ptr &rtmp, bool key_pos) { key_pos = decodeRtmp(rtmp); RtmpCodec::inputRtmp(rtmp, key_pos); return key_pos; } bool H264RtmpDecoder::decodeRtmp(const RtmpPacket::Ptr &pkt) { if (pkt->isCfgFrame()) { //缓存sps pps，后续插入到I帧之前 _sps = pkt->getH264SPS(); _pps = pkt->getH264PPS(); return false; } if (pkt->strBuf.size() > 9) { uint32_t iTotalLen = pkt->strBuf.size(); uint32_t iOffset = 5; uint8_t *cts_ptr = (uint8_t *) (pkt->strBuf.data() + 2); int32_t cts = (((cts_ptr[0] << 16) | (cts_ptr[1] << 8) | (cts_ptr[2])) + 0xff800000) ^ 0xff800000; auto pts = pkt->timeStamp + cts; while(iOffset + 4 < iTotalLen){ uint32_t iFrameLen; memcpy(&iFrameLen, pkt->strBuf.data() + iOffset, 4); iFrameLen = ntohl(iFrameLen); iOffset += 4; if(iFrameLen + iOffset > iTotalLen){ break; } onGetH264_l(pkt->strBuf.data() + iOffset, iFrameLen, pkt->timeStamp , pts); iOffset += iFrameLen; } } return pkt->isVideoKeyFrame(); } inline void H264RtmpDecoder::onGetH264_l(const char* pcData, int iLen, uint32_t dts,uint32_t pts) { switch (H264_TYPE(pcData[0])) { case H264Frame::NAL_IDR: { //I frame if(_sps.length()){ onGetH264(_sps.data(), _sps.length(), dts , pts); } if(_pps.length()){ onGetH264(_pps.data(), _pps.length(), dts , pts); } onGetH264(pcData, iLen, dts , pts); } break; case H264Frame::NAL_B_P: { //I or P or B frame onGetH264(pcData, iLen, dts , pts); } break; default: break; } } inline void H264RtmpDecoder::onGetH264(const char* pcData, int iLen, uint32_t dts,uint32_t pts) { _h264frame->type = H264_TYPE(pcData[0]); _h264frame->timeStamp = dts; _h264frame->ptsStamp = pts; _h264frame->buffer.assign("\x0\x0\x0\x1", 4); //添加264头 _h264frame->buffer.append(pcData, iLen); //写入环形缓存 RtmpCodec::inputFrame(_h264frame); _h264frame = obtainFrame(); } //////////////////////////////////////////////////////////////////////// H264RtmpEncoder::H264RtmpEncoder(const Track::Ptr &track) { _track = dynamic_pointer_cast(track); } void H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) { RtmpCodec::inputFrame(frame); auto pcData = frame->data() + frame->prefixSize(); auto iLen = frame->size() - frame->prefixSize(); auto type = H264_TYPE(((uint8_t*)pcData)[0]); if(!_gotSpsPps){ //尝试从frame中获取sps pps switch (type){ case H264Frame::NAL_SPS:{ //sps if(_sps.empty()){ _sps = string(pcData,iLen); } } break; case H264Frame::NAL_PPS:{ //pps if(_pps.empty()){ _pps = string(pcData,iLen); } } break; default: break; } if(_track && _track->ready()){ //尝试从track中获取sps pps信息 _sps = _track->getSps(); _pps = _track->getPps(); } if(!_sps.empty() && !_pps.empty()){ _gotSpsPps = true; makeVideoConfigPkt(); } } switch (type){ case H264Frame::NAL_IDR: case H264Frame::NAL_B_P:{ if(_lastPacket && _lastPacket->timeStamp != frame->stamp()) { RtmpCodec::inputRtmp(_lastPacket, _lastPacket->isVideoKeyFrame()); _lastPacket = nullptr; } if(!_lastPacket) { //I or P or B frame int8_t flags = 7; //h.264 bool is_config = false; flags |= ((frame->keyFrame() ? FLV_KEY_FRAME : FLV_INTER_FRAME) << 4); _lastPacket = ResourcePoolHelper::obtainObj(); _lastPacket->strBuf.clear(); _lastPacket->strBuf.push_back(flags); _lastPacket->strBuf.push_back(!is_config); auto cts = frame->pts() - frame->dts(); cts = htonl(cts); _lastPacket->strBuf.append((char *)&cts + 1, 3); _lastPacket->chunkId = CHUNK_VIDEO; _lastPacket->streamId = STREAM_MEDIA; _lastPacket->timeStamp = frame->stamp(); _lastPacket->typeId = MSG_VIDEO; } auto size = htonl(iLen); _lastPacket->strBuf.append((char *) &size, 4); _lastPacket->strBuf.append(pcData, iLen); _lastPacket->bodySize = _lastPacket->strBuf.size(); } break; default: break; } } void H264RtmpEncoder::makeVideoConfigPkt() { int8_t flags = 7; //h.264 flags |= (FLV_KEY_FRAME << 4); bool is_config = true; RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper::obtainObj(); rtmpPkt->strBuf.clear(); //////////header rtmpPkt->strBuf.push_back(flags); rtmpPkt->strBuf.push_back(!is_config); rtmpPkt->strBuf.append("\x0\x0\x0", 3); ////////////sps rtmpPkt->strBuf.push_back(1); // version //DebugL<strBuf.push_back(_sps[1]); // profile rtmpPkt->strBuf.push_back(_sps[2]); // compat rtmpPkt->strBuf.push_back(_sps[3]); // level rtmpPkt->strBuf.push_back(0xff); // 6 bits reserved + 2 bits nal size length - 1 (11) rtmpPkt->strBuf.push_back(0xe1); // 3 bits reserved + 5 bits number of sps (00001) uint16_t size = _sps.size(); size = htons(size); rtmpPkt->strBuf.append((char *) &size, 2); rtmpPkt->strBuf.append(_sps); /////////////pps rtmpPkt->strBuf.push_back(1); // version size = _pps.size(); size = htons(size); rtmpPkt->strBuf.append((char *) &size, 2); rtmpPkt->strBuf.append(_pps); rtmpPkt->bodySize = rtmpPkt->strBuf.size(); rtmpPkt->chunkId = CHUNK_VIDEO; rtmpPkt->streamId = STREAM_MEDIA; rtmpPkt->timeStamp = 0; rtmpPkt->typeId = MSG_VIDEO; RtmpCodec::inputRtmp(rtmpPkt, false); } }//namespace mediakit