mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-30 15:36:57 +08:00
337 lines
9.4 KiB
C++
337 lines
9.4 KiB
C++
/*
|
||
* 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.
|
||
*/
|
||
|
||
#ifndef ZLMEDIAKIT_H264_H
|
||
#define ZLMEDIAKIT_H264_H
|
||
|
||
#include "Frame.h"
|
||
#include "Track.h"
|
||
#include "Util/base64.h"
|
||
using namespace toolkit;
|
||
#define H264_TYPE(v) ((uint8_t)(v) & 0x1F)
|
||
|
||
namespace mediakit{
|
||
|
||
bool getAVCInfo(const string &strSps,int &iVideoWidth, int &iVideoHeight, float &iVideoFps);
|
||
void splitH264(const char *ptr, size_t len, size_t prefix, const std::function<void(const char *, size_t, size_t)> &cb);
|
||
size_t prefixSize(const char *ptr, size_t len);
|
||
/**
|
||
* 264帧类
|
||
*/
|
||
class H264Frame : public FrameImp {
|
||
public:
|
||
typedef std::shared_ptr<H264Frame> Ptr;
|
||
|
||
typedef enum {
|
||
NAL_IDR = 5,
|
||
NAL_SEI = 6,
|
||
NAL_SPS = 7,
|
||
NAL_PPS = 8,
|
||
NAL_AUD = 9,
|
||
NAL_B_P = 1,
|
||
} NalType;
|
||
|
||
H264Frame(){
|
||
_codec_id = CodecH264;
|
||
}
|
||
|
||
bool keyFrame() const override {
|
||
return H264_TYPE(_buffer[_prefix_size]) == H264Frame::NAL_IDR;
|
||
}
|
||
|
||
bool configFrame() const override{
|
||
switch(H264_TYPE(_buffer[_prefix_size]) ){
|
||
case H264Frame::NAL_SPS:
|
||
case H264Frame::NAL_PPS:return true;
|
||
default:return false;
|
||
}
|
||
}
|
||
};
|
||
|
||
/**
|
||
* 防止内存拷贝的H264类
|
||
* 用户可以通过该类型快速把一个指针无拷贝的包装成Frame类
|
||
* 该类型在DevChannel中有使用
|
||
*/
|
||
class H264FrameNoCacheAble : public FrameFromPtr {
|
||
public:
|
||
typedef std::shared_ptr<H264FrameNoCacheAble> Ptr;
|
||
|
||
H264FrameNoCacheAble(char *ptr,size_t size,uint32_t dts , uint32_t pts ,size_t prefix_size = 4){
|
||
_ptr = ptr;
|
||
_size = size;
|
||
_dts = dts;
|
||
_pts = pts;
|
||
_prefix_size = prefix_size;
|
||
_codec_id = CodecH264;
|
||
}
|
||
|
||
bool keyFrame() const override {
|
||
return H264_TYPE(_ptr[_prefix_size]) == H264Frame::NAL_IDR;
|
||
}
|
||
|
||
bool configFrame() const override{
|
||
switch(H264_TYPE(_ptr[_prefix_size])){
|
||
case H264Frame::NAL_SPS:
|
||
case H264Frame::NAL_PPS:return true;
|
||
default:return false;
|
||
}
|
||
}
|
||
};
|
||
|
||
typedef FrameInternal<H264FrameNoCacheAble> H264FrameInternal;
|
||
|
||
/**
|
||
* 264视频通道
|
||
*/
|
||
class H264Track : public VideoTrack{
|
||
public:
|
||
typedef std::shared_ptr<H264Track> Ptr;
|
||
|
||
/**
|
||
* 不指定sps pps构造h264类型的媒体
|
||
* 在随后的inputFrame中获取sps pps
|
||
*/
|
||
H264Track(){}
|
||
/**
|
||
* 构造h264类型的媒体
|
||
* @param sps sps帧数据
|
||
* @param pps pps帧数据
|
||
* @param sps_prefix_len 264头长度，可以为3个或4个字节，一般为0x00 00 00 01
|
||
* @param pps_prefix_len 264头长度，可以为3个或4个字节，一般为0x00 00 00 01
|
||
*/
|
||
H264Track(const string &sps,const string &pps,int sps_prefix_len = 4,int pps_prefix_len = 4){
|
||
_sps = sps.substr(sps_prefix_len);
|
||
_pps = pps.substr(pps_prefix_len);
|
||
onReady();
|
||
}
|
||
|
||
/**
|
||
* 构造h264类型的媒体
|
||
* @param sps sps帧
|
||
* @param pps pps帧
|
||
*/
|
||
H264Track(const Frame::Ptr &sps,const Frame::Ptr &pps){
|
||
if(sps->getCodecId() != CodecH264 || pps->getCodecId() != CodecH264 ){
|
||
throw std::invalid_argument("必须输入H264类型的帧");
|
||
}
|
||
_sps = string(sps->data() + sps->prefixSize(),sps->size() - sps->prefixSize());
|
||
_pps = string(pps->data() + pps->prefixSize(),pps->size() - pps->prefixSize());
|
||
onReady();
|
||
}
|
||
|
||
/**
|
||
* 返回不带0x00 00 00 01头的sps
|
||
* @return
|
||
*/
|
||
const string &getSps() const{
|
||
return _sps;
|
||
}
|
||
|
||
/**
|
||
* 返回不带0x00 00 00 01头的pps
|
||
* @return
|
||
*/
|
||
const string &getPps() const{
|
||
return _pps;
|
||
}
|
||
|
||
CodecId getCodecId() const override {
|
||
return CodecH264;
|
||
}
|
||
|
||
/**
|
||
* 返回视频高度
|
||
* @return
|
||
*/
|
||
int getVideoHeight() const override{
|
||
return _height ;
|
||
}
|
||
|
||
/**
|
||
* 返回视频宽度
|
||
* @return
|
||
*/
|
||
int getVideoWidth() const override{
|
||
return _width;
|
||
}
|
||
|
||
/**
|
||
* 返回视频fps
|
||
* @return
|
||
*/
|
||
float getVideoFps() const override{
|
||
return _fps;
|
||
}
|
||
|
||
bool ready() override {
|
||
return !_sps.empty() && !_pps.empty();
|
||
}
|
||
|
||
/**
|
||
* 输入数据帧,并获取sps pps
|
||
* @param frame 数据帧
|
||
*/
|
||
void inputFrame(const Frame::Ptr &frame) override{
|
||
int type = H264_TYPE(*((uint8_t *)frame->data() + frame->prefixSize()));
|
||
if(type != H264Frame::NAL_B_P && type != H264Frame::NAL_IDR){
|
||
//非I/B/P帧情况下，split一下，防止多个帧粘合在一起
|
||
splitH264(frame->data(), frame->size(), frame->prefixSize(), [&](const char *ptr, size_t len, size_t prefix) {
|
||
H264FrameInternal::Ptr sub_frame = std::make_shared<H264FrameInternal>(frame, (char *)ptr, len, prefix);
|
||
inputFrame_l(sub_frame);
|
||
});
|
||
} else{
|
||
inputFrame_l(frame);
|
||
}
|
||
}
|
||
private:
|
||
/**
|
||
* 解析sps获取宽高fps
|
||
*/
|
||
void onReady(){
|
||
getAVCInfo(_sps,_width,_height,_fps);
|
||
}
|
||
Track::Ptr clone() override {
|
||
return std::make_shared<std::remove_reference<decltype(*this)>::type >(*this);
|
||
}
|
||
|
||
/**
|
||
* 输入数据帧,并获取sps pps
|
||
* @param frame 数据帧
|
||
*/
|
||
void inputFrame_l(const Frame::Ptr &frame){
|
||
int type = H264_TYPE(*((uint8_t *)frame->data() + frame->prefixSize()));
|
||
switch (type){
|
||
case H264Frame::NAL_SPS:{
|
||
//sps
|
||
_sps = string(frame->data() + frame->prefixSize(),frame->size() - frame->prefixSize());
|
||
}
|
||
break;
|
||
case H264Frame::NAL_PPS:{
|
||
//pps
|
||
_pps = string(frame->data() + frame->prefixSize(),frame->size() - frame->prefixSize());
|
||
}
|
||
break;
|
||
|
||
case H264Frame::NAL_IDR:{
|
||
//I
|
||
insertConfigFrame(frame);
|
||
VideoTrack::inputFrame(frame);
|
||
}
|
||
break;
|
||
case H264Frame::NAL_AUD:{
|
||
//忽略AUD帧;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
VideoTrack::inputFrame(frame);
|
||
break;
|
||
}
|
||
|
||
_last_frame_is_idr = type == H264Frame::NAL_IDR;
|
||
if(_width == 0 && ready()){
|
||
onReady();
|
||
}
|
||
}
|
||
|
||
//生成sdp
|
||
Sdp::Ptr getSdp() override ;
|
||
private:
|
||
//在idr帧前插入sps pps帧
|
||
void insertConfigFrame(const Frame::Ptr &frame){
|
||
if(_last_frame_is_idr){
|
||
return;
|
||
}
|
||
|
||
if(!_sps.empty()){
|
||
auto spsFrame = std::make_shared<H264Frame>();
|
||
spsFrame->_prefix_size = 4;
|
||
spsFrame->_buffer.assign("\x0\x0\x0\x1",4);
|
||
spsFrame->_buffer.append(_sps);
|
||
spsFrame->_dts = frame->dts();
|
||
VideoTrack::inputFrame(spsFrame);
|
||
}
|
||
|
||
if(!_pps.empty()){
|
||
auto ppsFrame = std::make_shared<H264Frame>();
|
||
ppsFrame->_prefix_size = 4;
|
||
ppsFrame->_buffer.assign("\x0\x0\x0\x1",4);
|
||
ppsFrame->_buffer.append(_pps);
|
||
ppsFrame->_dts = frame->dts();
|
||
VideoTrack::inputFrame(ppsFrame);
|
||
}
|
||
}
|
||
private:
|
||
string _sps;
|
||
string _pps;
|
||
int _width = 0;
|
||
int _height = 0;
|
||
float _fps = 0;
|
||
bool _last_frame_is_idr = false;
|
||
};
|
||
|
||
/**
|
||
* h264类型sdp
|
||
*/
|
||
class H264Sdp : public Sdp {
|
||
public:
|
||
/**
|
||
*
|
||
* @param sps 264 sps,不带0x00000001头
|
||
* @param pps 264 pps,不带0x00000001头
|
||
* @param payload_type rtp payload type 默认96
|
||
* @param bitrate 比特率
|
||
*/
|
||
H264Sdp(const string &strSPS,
|
||
const string &strPPS,
|
||
int bitrate = 4000,
|
||
int payload_type = 96) : Sdp(90000,payload_type) {
|
||
//视频通道
|
||
_printer << "m=video 0 RTP/AVP " << payload_type << "\r\n";
|
||
if (bitrate) {
|
||
_printer << "b=AS:" << bitrate << "\r\n";
|
||
}
|
||
_printer << "a=rtpmap:" << payload_type << " H264/" << 90000 << "\r\n";
|
||
_printer << "a=fmtp:" << payload_type << " packetization-mode=1; profile-level-id=";
|
||
|
||
char strTemp[100];
|
||
uint32_t profile_level_id = 0;
|
||
if (strSPS.length() >= 4) { // sanity check
|
||
profile_level_id = (uint8_t(strSPS[1]) << 16) |
|
||
(uint8_t(strSPS[2]) << 8) |
|
||
(uint8_t(strSPS[3])); // profile_idc|constraint_setN_flag|level_idc
|
||
}
|
||
memset(strTemp, 0, 100);
|
||
snprintf(strTemp, sizeof(strTemp), "%06X", profile_level_id);
|
||
_printer << strTemp;
|
||
_printer << "; sprop-parameter-sets=";
|
||
memset(strTemp, 0, 100);
|
||
av_base64_encode(strTemp, 100, (uint8_t *) strSPS.data(), (int)strSPS.size());
|
||
_printer << strTemp << ",";
|
||
memset(strTemp, 0, 100);
|
||
av_base64_encode(strTemp, 100, (uint8_t *) strPPS.data(), (int)strPPS.size());
|
||
_printer << strTemp << "\r\n";
|
||
_printer << "a=control:trackID=" << (int)TrackVideo << "\r\n";
|
||
}
|
||
|
||
string getSdp() const override {
|
||
return _printer;
|
||
}
|
||
|
||
CodecId getCodecId() const override {
|
||
return CodecH264;
|
||
}
|
||
private:
|
||
_StrPrinter _printer;
|
||
};
|
||
|
||
}//namespace mediakit
|
||
#endif //ZLMEDIAKIT_H264_H
|