/*
* MIT License
*
* Copyright (c) 2016-2019 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 "H264Rtmp.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;
case H264Frame::NAL_SPS: {
_sps.assign(pcData, iLen);
}
break;
case H264Frame::NAL_PPS:{
_pps.assign(pcData, iLen);
}
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<H264Track>(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<RtmpPacket>::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<RtmpPacket>::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<<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
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