mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-27 05:38:31 +08:00
264 lines
7.8 KiB
C++
264 lines
7.8 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include "H264Rtmp.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->_prefix_size = 4;
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return frame;
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}
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/**
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* 返回不带0x00 00 00 01头的sps
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* @return
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*/
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static string getH264SPS(const RtmpPacket &thiz) {
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string ret;
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if (thiz.getMediaType() != FLV_CODEC_H264) {
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return ret;
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}
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if (!thiz.isCfgFrame()) {
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return ret;
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}
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if (thiz.buffer.size() < 13) {
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WarnL << "bad H264 cfg!";
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return ret;
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}
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uint16_t sps_size ;
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memcpy(&sps_size, thiz.buffer.data() + 11, 2);
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sps_size = ntohs(sps_size);
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if ((int) thiz.buffer.size() < 13 + sps_size) {
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WarnL << "bad H264 cfg!";
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return ret;
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}
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ret.assign(thiz.buffer.data() + 13, sps_size);
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return ret;
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}
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/**
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* 返回不带0x00 00 00 01头的pps
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* @return
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*/
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static string getH264PPS(const RtmpPacket &thiz) {
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string ret;
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if (thiz.getMediaType() != FLV_CODEC_H264) {
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return ret;
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}
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if (!thiz.isCfgFrame()) {
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return ret;
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}
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if (thiz.buffer.size() < 13) {
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WarnL << "bad H264 cfg!";
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return ret;
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}
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uint16_t sps_size ;
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memcpy(&sps_size, thiz.buffer.data() + 11, 2);
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sps_size = ntohs(sps_size);
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if ((int) thiz.buffer.size() < 13 + sps_size + 1 + 2) {
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WarnL << "bad H264 cfg!";
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return ret;
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}
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uint16_t pps_size ;
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memcpy(&pps_size, thiz.buffer.data() + 13 + sps_size + 1, 2);
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pps_size = ntohs(pps_size);
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if ((int) thiz.buffer.size() < 13 + sps_size + 1 + 2 + pps_size) {
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WarnL << "bad H264 cfg!";
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return ret;
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}
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ret.assign(thiz.buffer.data() + 13 + sps_size + 1 + 2, pps_size);
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return ret;
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}
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void H264RtmpDecoder::inputRtmp(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 = getH264SPS(*pkt);
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_pps = getH264PPS(*pkt);
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onGetH264(_sps.data(), _sps.size(), pkt->time_stamp , pkt->time_stamp);
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onGetH264(_pps.data(), _pps.size(), pkt->time_stamp , pkt->time_stamp);
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return;
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}
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if (pkt->buffer.size() > 9) {
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auto iTotalLen = pkt->buffer.size();
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size_t iOffset = 5;
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uint8_t *cts_ptr = (uint8_t *) (pkt->buffer.data() + 2);
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int32_t cts = (((cts_ptr[0] << 16) | (cts_ptr[1] << 8) | (cts_ptr[2])) + 0xff800000) ^ 0xff800000;
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auto pts = pkt->time_stamp + cts;
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while(iOffset + 4 < iTotalLen){
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uint32_t iFrameLen;
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memcpy(&iFrameLen, pkt->buffer.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(pkt->buffer.data() + iOffset, iFrameLen, pkt->time_stamp , pts);
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iOffset += iFrameLen;
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}
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}
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}
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inline void H264RtmpDecoder::onGetH264(const char* pcData, size_t iLen, uint32_t dts,uint32_t pts) {
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if(iLen == 0){
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return;
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}
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#if 1
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_h264frame->_dts = dts;
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_h264frame->_pts = pts;
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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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#else
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//防止内存拷贝，这样产生的264帧不会有0x00 00 01头
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auto frame = std::make_shared<H264FrameNoCacheAble>((char *)pcData,iLen,dts,pts,0);
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RtmpCodec::inputFrame(frame);
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#endif
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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::makeConfigPacket(){
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if (_track && _track->ready()) {
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//尝试从track中获取sps pps信息
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_sps = _track->getSps();
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_pps = _track->getPps();
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}
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if (!_sps.empty() && !_pps.empty()) {
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//获取到sps/pps
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makeVideoConfigPkt();
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_gotSpsPps = true;
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}
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}
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void H264RtmpEncoder::inputFrame(const Frame::Ptr &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 = H264_TYPE(((uint8_t*)pcData)[0]);
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if(type == H264Frame::NAL_SEI){
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return;
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}
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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 H264Frame::NAL_SPS: {
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//sps
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_sps = string(pcData, iLen);
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makeConfigPacket();
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break;
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}
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case H264Frame::NAL_PPS: {
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//pps
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_pps = string(pcData, iLen);
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makeConfigPacket();
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break;
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}
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default:
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break;
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}
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}
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if(_lastPacket && _lastPacket->time_stamp != frame->dts()) {
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RtmpCodec::inputRtmp(_lastPacket);
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_lastPacket = nullptr;
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}
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if(!_lastPacket) {
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//I or P or B frame
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int8_t flags = FLV_CODEC_H264;
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bool is_config = false;
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flags |= (((frame->configFrame() || frame->keyFrame()) ? FLV_KEY_FRAME : FLV_INTER_FRAME) << 4);
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_lastPacket = ResourcePoolHelper<RtmpPacket>::obtainObj();
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_lastPacket->buffer.clear();
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_lastPacket->buffer.push_back(flags);
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_lastPacket->buffer.push_back(!is_config);
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int32_t cts = frame->pts() - frame->dts();
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if (cts < 0) {
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cts = 0;
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}
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cts = htonl(cts);
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_lastPacket->buffer.append((char *)&cts + 1, 3);
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_lastPacket->chunk_id = CHUNK_VIDEO;
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_lastPacket->stream_index = STREAM_MEDIA;
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_lastPacket->time_stamp = frame->dts();
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_lastPacket->type_id = MSG_VIDEO;
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}
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uint32_t size = htonl((uint32_t)iLen);
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_lastPacket->buffer.append((char *) &size, 4);
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_lastPacket->buffer.append(pcData, iLen);
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_lastPacket->body_size = _lastPacket->buffer.size();
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}
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void H264RtmpEncoder::makeVideoConfigPkt() {
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int8_t flags = FLV_CODEC_H264;
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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->buffer.clear();
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//header
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rtmpPkt->buffer.push_back(flags);
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rtmpPkt->buffer.push_back(!is_config);
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//cts
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rtmpPkt->buffer.append("\x0\x0\x0", 3);
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//AVCDecoderConfigurationRecord start
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rtmpPkt->buffer.push_back(1); // version
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rtmpPkt->buffer.push_back(_sps[1]); // profile
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rtmpPkt->buffer.push_back(_sps[2]); // compat
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rtmpPkt->buffer.push_back(_sps[3]); // level
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rtmpPkt->buffer.push_back((char)0xff); // 6 bits reserved + 2 bits nal size length - 1 (11)
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rtmpPkt->buffer.push_back((char)0xe1); // 3 bits reserved + 5 bits number of sps (00001)
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//sps
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uint16_t size = (uint16_t)_sps.size();
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size = htons(size);
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rtmpPkt->buffer.append((char *) &size, 2);
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rtmpPkt->buffer.append(_sps);
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//pps
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rtmpPkt->buffer.push_back(1); // version
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size = (uint16_t)_pps.size();
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size = htons(size);
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rtmpPkt->buffer.append((char *) &size, 2);
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rtmpPkt->buffer.append(_pps);
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rtmpPkt->body_size = rtmpPkt->buffer.size();
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rtmpPkt->chunk_id = CHUNK_VIDEO;
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rtmpPkt->stream_index = STREAM_MEDIA;
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rtmpPkt->time_stamp = 0;
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rtmpPkt->type_id = MSG_VIDEO;
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RtmpCodec::inputRtmp(rtmpPkt);
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}
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}//namespace mediakit
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