/*
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
*
* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
*
* Use of this source code is governed by MIT license that can be found in the
* LICENSE file in the root of the source tree. All contributing project authors
* may be found in the AUTHORS file in the root of the source tree.
*/
#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->_prefix_size = 4;
return frame;
}
/**
* 返回不带0x00 00 00 01头的sps
* @return
*/
static string getH264SPS(const RtmpPacket &thiz) {
string ret;
if (thiz.getMediaType() != FLV_CODEC_H264) {
return ret;
}
if (!thiz.isCfgFrame()) {
return ret;
}
if (thiz.buffer.size() < 13) {
WarnL << "bad H264 cfg!";
return ret;
}
uint16_t sps_size ;
memcpy(&sps_size, thiz.buffer.data() + 11, 2);
sps_size = ntohs(sps_size);
if ((int) thiz.buffer.size() < 13 + sps_size) {
WarnL << "bad H264 cfg!";
return ret;
}
ret.assign(thiz.buffer.data() + 13, sps_size);
return ret;
}
/**
* 返回不带0x00 00 00 01头的pps
* @return
*/
static string getH264PPS(const RtmpPacket &thiz) {
string ret;
if (thiz.getMediaType() != FLV_CODEC_H264) {
return ret;
}
if (!thiz.isCfgFrame()) {
return ret;
}
if (thiz.buffer.size() < 13) {
WarnL << "bad H264 cfg!";
return ret;
}
uint16_t sps_size ;
memcpy(&sps_size, thiz.buffer.data() + 11, 2);
sps_size = ntohs(sps_size);
if ((int) thiz.buffer.size() < 13 + sps_size + 1 + 2) {
WarnL << "bad H264 cfg!";
return ret;
}
uint16_t pps_size ;
memcpy(&pps_size, thiz.buffer.data() + 13 + sps_size + 1, 2);
pps_size = ntohs(pps_size);
if ((int) thiz.buffer.size() < 13 + sps_size + 1 + 2 + pps_size) {
WarnL << "bad H264 cfg!";
return ret;
}
ret.assign(thiz.buffer.data() + 13 + sps_size + 1 + 2, pps_size);
return ret;
}
void H264RtmpDecoder::inputRtmp(const RtmpPacket::Ptr &pkt) {
if (pkt->isCfgFrame()) {
//缓存sps pps，后续插入到I帧之前
_sps = getH264SPS(*pkt);
_pps = getH264PPS(*pkt);
onGetH264(_sps.data(), _sps.size(), pkt->time_stamp , pkt->time_stamp);
onGetH264(_pps.data(), _pps.size(), pkt->time_stamp , pkt->time_stamp);
return;
}
if (pkt->buffer.size() > 9) {
auto iTotalLen = pkt->buffer.size();
size_t iOffset = 5;
uint8_t *cts_ptr = (uint8_t *) (pkt->buffer.data() + 2);
int32_t cts = (((cts_ptr[0] << 16) | (cts_ptr[1] << 8) | (cts_ptr[2])) + 0xff800000) ^ 0xff800000;
auto pts = pkt->time_stamp + cts;
while(iOffset + 4 < iTotalLen){
uint32_t iFrameLen;
memcpy(&iFrameLen, pkt->buffer.data() + iOffset, 4);
iFrameLen = ntohl(iFrameLen);
iOffset += 4;
if(iFrameLen + iOffset > iTotalLen){
break;
}
onGetH264(pkt->buffer.data() + iOffset, iFrameLen, pkt->time_stamp , pts);
iOffset += iFrameLen;
}
}
}
inline void H264RtmpDecoder::onGetH264(const char* pcData, size_t iLen, uint32_t dts,uint32_t pts) {
if(iLen == 0){
return;
}
#if 1
_h264frame->_dts = dts;
_h264frame->_pts = 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();
#else
//防止内存拷贝，这样产生的264帧不会有0x00 00 01头
auto frame = std::make_shared<H264FrameNoCacheAble>((char *)pcData,iLen,dts,pts,0);
RtmpCodec::inputFrame(frame);
#endif
}
////////////////////////////////////////////////////////////////////////
H264RtmpEncoder::H264RtmpEncoder(const Track::Ptr &track) {
_track = dynamic_pointer_cast<H264Track>(track);
}
void H264RtmpEncoder::makeConfigPacket(){
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()) {
//获取到sps/pps
makeVideoConfigPkt();
_gotSpsPps = true;
}
}
void H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
auto pcData = frame->data() + frame->prefixSize();
auto iLen = frame->size() - frame->prefixSize();
auto type = H264_TYPE(((uint8_t*)pcData)[0]);
if(type == H264Frame::NAL_SEI){
return;
}
if (!_gotSpsPps) {
//尝试从frame中获取sps pps
switch (type) {
case H264Frame::NAL_SPS: {
//sps
_sps = string(pcData, iLen);
makeConfigPacket();
break;
}
case H264Frame::NAL_PPS: {
//pps
_pps = string(pcData, iLen);
makeConfigPacket();
break;
}
default:
break;
}
}
if(_lastPacket && _lastPacket->time_stamp != frame->dts()) {
RtmpCodec::inputRtmp(_lastPacket);
_lastPacket = nullptr;
}
if(!_lastPacket) {
//I or P or B frame
int8_t flags = FLV_CODEC_H264;
bool is_config = false;
flags |= (((frame->configFrame() || frame->keyFrame()) ? FLV_KEY_FRAME : FLV_INTER_FRAME) << 4);
_lastPacket = ResourcePoolHelper<RtmpPacket>::obtainObj();
_lastPacket->buffer.clear();
_lastPacket->buffer.push_back(flags);
_lastPacket->buffer.push_back(!is_config);
int32_t cts = frame->pts() - frame->dts();
if (cts < 0) {
cts = 0;
}
cts = htonl(cts);
_lastPacket->buffer.append((char *)&cts + 1, 3);
_lastPacket->chunk_id = CHUNK_VIDEO;
_lastPacket->stream_index = STREAM_MEDIA;
_lastPacket->time_stamp = frame->dts();
_lastPacket->type_id = MSG_VIDEO;
}
uint32_t size = htonl((uint32_t)iLen);
_lastPacket->buffer.append((char *) &size, 4);
_lastPacket->buffer.append(pcData, iLen);
_lastPacket->body_size = _lastPacket->buffer.size();
}
void H264RtmpEncoder::makeVideoConfigPkt() {
int8_t flags = FLV_CODEC_H264;
flags |= (FLV_KEY_FRAME << 4);
bool is_config = true;
RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
rtmpPkt->buffer.clear();
//header
rtmpPkt->buffer.push_back(flags);
rtmpPkt->buffer.push_back(!is_config);
//cts
rtmpPkt->buffer.append("\x0\x0\x0", 3);
//AVCDecoderConfigurationRecord start
rtmpPkt->buffer.push_back(1); // version
rtmpPkt->buffer.push_back(_sps[1]); // profile
rtmpPkt->buffer.push_back(_sps[2]); // compat
rtmpPkt->buffer.push_back(_sps[3]); // level
rtmpPkt->buffer.push_back((char)0xff); // 6 bits reserved + 2 bits nal size length - 1 (11)
rtmpPkt->buffer.push_back((char)0xe1); // 3 bits reserved + 5 bits number of sps (00001)
//sps
uint16_t size = (uint16_t)_sps.size();
size = htons(size);
rtmpPkt->buffer.append((char *) &size, 2);
rtmpPkt->buffer.append(_sps);
//pps
rtmpPkt->buffer.push_back(1); // version
size = (uint16_t)_pps.size();
size = htons(size);
rtmpPkt->buffer.append((char *) &size, 2);
rtmpPkt->buffer.append(_pps);
rtmpPkt->body_size = rtmpPkt->buffer.size();
rtmpPkt->chunk_id = CHUNK_VIDEO;
rtmpPkt->stream_index = STREAM_MEDIA;
rtmpPkt->time_stamp = 0;
rtmpPkt->type_id = MSG_VIDEO;
RtmpCodec::inputRtmp(rtmpPkt);
}
}//namespace mediakit