mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-23 11:17:09 +08:00
212 lines
7.3 KiB
C++
212 lines
7.3 KiB
C++
/*
|
||
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
|
||
*
|
||
* This file is part of ZLMediaKit(https://github.com/xiongziliang/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 "H265Rtp.h"
|
||
|
||
namespace mediakit{
|
||
|
||
//41
|
||
//42 0 1
|
||
//43 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
||
//44 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
//45 |F| Type | LayerId | TID |
|
||
//46 +-------------+-----------------+
|
||
//48 F = 0
|
||
//49 Type = 49 (fragmentation unit (FU))
|
||
//50 LayerId = 0
|
||
//51 TID = 1
|
||
//56 /*
|
||
//57 create the FU header
|
||
//58
|
||
//59 0 1 2 3 4 5 6 7
|
||
//60 +-+-+-+-+-+-+-+-+
|
||
//61 |S|E| FuType |
|
||
//62 +---------------+
|
||
//63
|
||
//64 S = variable
|
||
//65 E = variable
|
||
//66 FuType = NAL unit type
|
||
//67
|
||
|
||
typedef struct {
|
||
unsigned S :1;
|
||
unsigned E :1;
|
||
unsigned type :6;
|
||
} FU;
|
||
|
||
static void MakeFU(uint8_t in, FU &fu) {
|
||
fu.S = in >> 7;
|
||
fu.E = (in >> 6) & 0x01;
|
||
fu.type = in & 0x3f;
|
||
}
|
||
|
||
H265RtpDecoder::H265RtpDecoder() {
|
||
_h265frame = obtainFrame();
|
||
}
|
||
|
||
H265Frame::Ptr H265RtpDecoder::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 = ResourcePoolHelper<H265Frame>::obtainObj();
|
||
frame->_buffer.clear();
|
||
frame->_prefix_size = 4;
|
||
return frame;
|
||
}
|
||
|
||
bool H265RtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
|
||
return decodeRtp(rtp);
|
||
}
|
||
|
||
bool H265RtpDecoder::decodeRtp(const RtpPacket::Ptr &rtppack) {
|
||
const uint8_t *frame = (uint8_t *) rtppack->data() + rtppack->offset;
|
||
int length = rtppack->size() - rtppack->offset;
|
||
int nal = H265_TYPE(frame[0]);
|
||
|
||
if (nal > 50){
|
||
WarnL << "不支持该类型的265 RTP包" << nal;
|
||
return false; // packet discard, Unsupported (HEVC) NAL type
|
||
}
|
||
switch (nal) {
|
||
case 50:
|
||
case 48: // aggregated packet (AP) - with two or more NAL units
|
||
WarnL << "不支持该类型的265 RTP包" << nal;
|
||
return false;
|
||
case 49: {
|
||
// fragmentation unit (FU)
|
||
FU fu;
|
||
MakeFU(frame[2], fu);
|
||
if (fu.S) {
|
||
//该帧的第一个rtp包
|
||
_h265frame->_buffer.assign("\x0\x0\x0\x1", 4);
|
||
_h265frame->_buffer.push_back(fu.type << 1);
|
||
_h265frame->_buffer.push_back(0x01);
|
||
_h265frame->_buffer.append((char *) frame + 3, length - 3);
|
||
_h265frame->_pts = rtppack->timeStamp;
|
||
//该函数return时，保存下当前sequence,以便下次对比seq是否连续
|
||
_lastSeq = rtppack->sequence;
|
||
return (_h265frame->keyFrame()); //i frame
|
||
}
|
||
|
||
if (rtppack->sequence != _lastSeq + 1 && rtppack->sequence != 0) {
|
||
//中间的或末尾的rtp包，其seq必须连续(如果回环了则判定为连续)，否则说明rtp丢包，那么该帧不完整，必须得丢弃
|
||
_h265frame->_buffer.clear();
|
||
WarnL << "rtp丢包: " << rtppack->sequence << " != " << _lastSeq << " + 1,该帧被废弃";
|
||
return false;
|
||
}
|
||
|
||
if (!fu.E) {
|
||
//该帧的中间rtp包
|
||
_h265frame->_buffer.append((char *) frame + 3, length - 3);
|
||
//该函数return时，保存下当前sequence,以便下次对比seq是否连续
|
||
_lastSeq = rtppack->sequence;
|
||
return false;
|
||
}
|
||
|
||
//该帧最后一个rtp包
|
||
_h265frame->_buffer.append((char *) frame + 3, length - 3);
|
||
_h265frame->_pts = rtppack->timeStamp;
|
||
onGetH265(_h265frame);
|
||
return false;
|
||
}
|
||
|
||
default: // 4.4.1. Single NAL Unit Packets (p24)
|
||
//a full frame
|
||
_h265frame->_buffer.assign("\x0\x0\x0\x1", 4);
|
||
_h265frame->_buffer.append((char *)frame, length);
|
||
_h265frame->_pts = rtppack->timeStamp;
|
||
auto key = _h265frame->keyFrame();
|
||
onGetH265(_h265frame);
|
||
return key;
|
||
}
|
||
}
|
||
|
||
void H265RtpDecoder::onGetH265(const H265Frame::Ptr &frame) {
|
||
//rtsp没有dts，那么根据pts排序算法生成dts
|
||
_dts_generator.getDts(frame->_pts,frame->_dts);
|
||
//写入环形缓存
|
||
RtpCodec::inputFrame(frame);
|
||
_h265frame = obtainFrame();
|
||
}
|
||
|
||
|
||
////////////////////////////////////////////////////////////////////////
|
||
|
||
H265RtpEncoder::H265RtpEncoder(uint32_t ui32Ssrc,
|
||
uint32_t ui32MtuSize,
|
||
uint32_t ui32SampleRate,
|
||
uint8_t ui8PayloadType,
|
||
uint8_t ui8Interleaved) :
|
||
RtpInfo(ui32Ssrc,
|
||
ui32MtuSize,
|
||
ui32SampleRate,
|
||
ui8PayloadType,
|
||
ui8Interleaved) {
|
||
}
|
||
|
||
void H265RtpEncoder::inputFrame(const Frame::Ptr &frame) {
|
||
GET_CONFIG(uint32_t,cycleMS,Rtp::kCycleMS);
|
||
uint8_t *pcData = (uint8_t*)frame->data() + frame->prefixSize();
|
||
auto uiStamp = frame->pts();
|
||
auto iLen = frame->size() - frame->prefixSize();
|
||
unsigned char naluType = H265_TYPE(pcData[0]); //获取NALU的5bit 帧类型
|
||
uiStamp %= cycleMS;
|
||
|
||
int maxSize = _ui32MtuSize - 3;
|
||
//超过MTU,按照FU方式打包
|
||
if (iLen > maxSize) {
|
||
//获取帧头数据，1byte
|
||
unsigned char s_e_flags;
|
||
bool bFirst = true;
|
||
bool mark = false;
|
||
int nOffset = 2;
|
||
while (!mark) {
|
||
if (iLen <= nOffset + maxSize) { //是否拆分结束
|
||
maxSize = iLen - nOffset;
|
||
mark = true;
|
||
//FU end
|
||
s_e_flags = (1 << 6) | naluType;
|
||
} else if (bFirst) {
|
||
//FU start
|
||
s_e_flags = (1 << 7) | naluType;
|
||
} else {
|
||
//FU mid
|
||
s_e_flags = naluType;
|
||
}
|
||
|
||
{
|
||
//传入nullptr先不做payload的内存拷贝
|
||
auto rtp = makeRtp(getTrackType(), nullptr, maxSize + 3, mark, uiStamp);
|
||
//rtp payload 负载部分
|
||
uint8_t *payload = (uint8_t*)rtp->data() + rtp->offset;
|
||
//FU 第1个字节，表明为FU
|
||
payload[0] = 49 << 1;
|
||
//FU 第2个字节貌似固定为1
|
||
payload[1] = 1;
|
||
//FU 第3个字节
|
||
payload[2] = s_e_flags;
|
||
//H265 数据
|
||
memcpy(payload + 3,pcData + nOffset, maxSize);
|
||
//输入到rtp环形缓存
|
||
RtpCodec::inputRtp(rtp,bFirst && H265Frame::isKeyFrame(naluType));
|
||
}
|
||
|
||
nOffset += maxSize;
|
||
bFirst = false;
|
||
}
|
||
} else {
|
||
makeH265Rtp(naluType,pcData, iLen, false, true, uiStamp);
|
||
}
|
||
}
|
||
|
||
void H265RtpEncoder::makeH265Rtp(int nal_type,const void* data, unsigned int len, bool mark, bool first_packet, uint32_t uiStamp) {
|
||
RtpCodec::inputRtp(makeRtp(getTrackType(),data,len,mark,uiStamp),first_packet && H265Frame::isKeyFrame(nal_type));
|
||
}
|
||
|
||
}//namespace mediakit
|