ZLMediaKit/src/RtmpMuxer/H264RtmpCodec.cpp

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/*
* 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.
*/
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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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}
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
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_sps = pkt->getH264SPS();
_pps = pkt->getH264PPS();
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return false;
}
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if (_sps.size()) {
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uint32_t iTotalLen = pkt->strBuf.size();
uint32_t iOffset = 5;
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);
iOffset += iFrameLen;
}
}
return pkt->isVideoKeyFrame();
}
inline void H264RtmpDecoder::onGetH264_l(const char* pcData, int iLen, uint32_t ui32TimeStamp) {
switch (pcData[0] & 0x1F) {
case 5: {
//I frame
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onGetH264(_sps.data(), _sps.length(), ui32TimeStamp);
onGetH264(_pps.data(), _pps.length(), ui32TimeStamp);
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}
case 1: {
//I or P or B frame
onGetH264(pcData, iLen, ui32TimeStamp);
}
break;
default:
//WarnL <<(int)(pcData[0] & 0x1F);
break;
}
}
inline void H264RtmpDecoder::onGetH264(const char* pcData, int iLen, uint32_t ui32TimeStamp) {
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_h264frame->type = pcData[0] & 0x1F;
_h264frame->timeStamp = ui32TimeStamp;
_h264frame->buffer.assign("\x0\x0\x0\x1", 4); //添加264头
_h264frame->buffer.append(pcData, iLen);
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//写入环形缓存
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RtmpCodec::inputFrame(_h264frame);
_h264frame = obtainFrame();
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}
////////////////////////////////////////////////////////////////////////
H264RtmpEncoder::H264RtmpEncoder(const Track::Ptr &track) {
_track = dynamic_pointer_cast<H264Track>(track);
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}
void H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
RtmpCodec::inputFrame(frame);
auto pcData = frame->data() + frame->prefixSize();
auto iLen = frame->size() - frame->prefixSize();
auto type = ((uint8_t*)pcData)[0] & 0x1F;
//尝试从frame中获取sps pps
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switch (type){
case 7:{
//sps
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if(_sps.empty()){
_sps = string(pcData,iLen);
if(!_pps.empty()){
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makeVideoConfigPkt();
}
}
}
break;
case 8:{
//pps
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if(_pps.empty()){
_pps = string(pcData,iLen);
if(!_sps.empty()){
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makeVideoConfigPkt();
}
}
}
break;
default:
break;
}
//尝试从track中获取sps pps信息
if((!_sps.empty() || !_pps.empty()) && _track && _track->ready()){
_sps = _track->getSps();
_pps = _track->getPps();
makeVideoConfigPkt();
}
switch (type){
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case 1:
case 5:{
//I or P or B frame
int8_t flags = 7; //h.264
bool is_config = false;
bool keyFrame = frame->keyFrame();
flags |= ((keyFrame ? FLV_KEY_FRAME : FLV_INTER_FRAME) << 4);
RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
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rtmpPkt->strBuf.clear();
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rtmpPkt->strBuf.push_back(flags);
rtmpPkt->strBuf.push_back(!is_config);
rtmpPkt->strBuf.append("\x0\x0\x0", 3);
auto size = htonl(iLen);
rtmpPkt->strBuf.append((char *) &size, 4);
rtmpPkt->strBuf.append(pcData, iLen);
rtmpPkt->bodySize = rtmpPkt->strBuf.size();
rtmpPkt->chunkId = CHUNK_VIDEO;
rtmpPkt->streamId = STREAM_MEDIA;
rtmpPkt->timeStamp = frame->stamp();
rtmpPkt->typeId = MSG_VIDEO;
RtmpCodec::inputRtmp(rtmpPkt,keyFrame);
}
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<RtmpPacket>::obtainObj();
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rtmpPkt->strBuf.clear();
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//////////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
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//DebugL<<hexdump(_sps.data(), _sps.size());
rtmpPkt->strBuf.push_back(_sps[1]); // profile
rtmpPkt->strBuf.push_back(_sps[2]); // compat
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)
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);
rtmpPkt->strBuf.append((char *) &size, 2);
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rtmpPkt->strBuf.append(_sps);
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/////////////pps
rtmpPkt->strBuf.push_back(1); // version
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size = _pps.size();
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size = htons(size);
rtmpPkt->strBuf.append((char *) &size, 2);
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rtmpPkt->strBuf.append(_pps);
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rtmpPkt->bodySize = rtmpPkt->strBuf.size();
rtmpPkt->chunkId = CHUNK_VIDEO;
rtmpPkt->streamId = STREAM_MEDIA;
rtmpPkt->timeStamp = 0;
rtmpPkt->typeId = MSG_VIDEO;
RtmpCodec::inputRtmp(rtmpPkt, true);
}
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}//namespace mediakit
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