本节内容主要描述如何将一个h264文件通过RTMP推到流媒体服务器上
工程目录如下
$ tree
.
|-- Makefile
|-- inc
| |-- librtmp_send264.h
| `-- sps_decode.h
|-- input.h264
|-- obj
| |-- librtmp_send264.o
| `-- test.o
|-- src
| |-- librtmp_send264.cpp
| `-- test.cpp
|-- third_lib
| |-- openssl
| | |-- include
| | | `-- openssl
| | | |-- aes.h
| | | |-- asn1.h
| | | |-- asn1_mac.h
| | | |-- asn1t.h
| | | |-- bio.h
| | | |-- blowfish.h
| | | |-- bn.h
| | | |-- buffer.h
| | | |-- camellia.h
| | | |-- cast.h
| | | |-- cmac.h
| | | |-- cms.h
| | | |-- comp.h
| | | |-- conf.h
| | | |-- conf_api.h
| | | |-- crypto.h
| | | |-- des.h
| | | |-- des_old.h
| | | |-- dh.h
| | | |-- dsa.h
| | | |-- dso.h
| | | |-- dtls1.h
| | | |-- e_os2.h
| | | |-- ebcdic.h
| | | |-- ec.h
| | | |-- ecdh.h
| | | |-- ecdsa.h
| | | |-- engine.h
| | | |-- err.h
| | | |-- evp.h
| | | |-- hmac.h
| | | |-- idea.h
| | | |-- krb5_asn.h
| | | |-- kssl.h
| | | |-- lhash.h
| | | |-- md4.h
| | | |-- md5.h
| | | |-- mdc2.h
| | | |-- modes.h
| | | |-- obj_mac.h
| | | |-- objects.h
| | | |-- ocsp.h
| | | |-- opensslconf.h
| | | |-- opensslv.h
| | | |-- ossl_typ.h
| | | |-- pem.h
| | | |-- pem2.h
| | | |-- pkcs12.h
| | | |-- pkcs7.h
| | | |-- pqueue.h
| | | |-- rand.h
| | | |-- rc2.h
| | | |-- rc4.h
| | | |-- ripemd.h
| | | |-- rsa.h
| | | |-- safestack.h
| | | |-- seed.h
| | | |-- sha.h
| | | |-- srp.h
| | | |-- srtp.h
| | | |-- ssl.h
| | | |-- ssl2.h
| | | |-- ssl23.h
| | | |-- ssl3.h
| | | |-- stack.h
| | | |-- symhacks.h
| | | |-- tls1.h
| | | |-- ts.h
| | | |-- txt_db.h
| | | |-- ui.h
| | | |-- ui_compat.h
| | | |-- whrlpool.h
| | | |-- x509.h
| | | |-- x509_vfy.h
| | | `-- x509v3.h
| | `-- lib
| | |-- libcrypto.so -> libcrypto.so.1.0.0
| | |-- libcrypto.so.1.0.0
| | |-- libssl.so -> libssl.so.1.0.0
| | `-- libssl.so.1.0.0
| |-- rtmpdump
| | |-- include
| | | `-- librtmp
| | | |-- amf.h
| | | |-- http.h
| | | |-- log.h
| | | `-- rtmp.h
| | `-- lib
| | |-- librtmp.so -> librtmp.so.0
| | `-- librtmp.so.0
| `-- zlib
| |-- include
| | |-- zconf.h
| | `-- zlib.h
| `-- lib
| |-- libz.so -> libz.so.1.2.8
| |-- libz.so.1 -> libz.so.1.2.8
| `-- libz.so.1.2.8
`-- video_prj
工程中的内容包括第三方如下文件
test.cpp
librtmp_send264.cpp
librtmp_send264.h
sps_decode.h
Makefile
下面分别介绍
test.cpp
#include <stdio.h>
#include "librtmp_send264.h"
FILE *fp_send1;
int read_buffer1(unsigned char *buf, int buf_size ){
if(!feof(fp_send1)){
int true_size=fread(buf,1,buf_size,fp_send1);
return true_size;
}else{
return -1;
}
}
int main(int argc, char* argv[])
{
fp_send1 = fopen("input.h264", "rb");
//初始化并连接到服务器
RTMP264_Connect("rtmp://127.0.0.1:1935/live/xx");
//发送
RTMP264_Send(read_buffer1);
//断开连接并释放相关资源
RTMP264_Close();
return 0;
}
librtmp_send264.cpp
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "librtmp_send264.h"
#include "librtmp/rtmp.h"
//#include "librtmp\rtmp_sys.h"
#include "librtmp/amf.h"
#include "sps_decode.h"
//定义包头长度，RTMP_MAX_HEADER_SIZE=18
#define RTMP_HEAD_SIZE (sizeof(RTMPPacket)+RTMP_MAX_HEADER_SIZE)
//存储Nal单元数据的buffer大小
#define BUFFER_SIZE 32768
//搜寻Nal单元时的一些标志
#define GOT_A_NAL_CROSS_BUFFER BUFFER_SIZE+1
#define GOT_A_NAL_INCLUDE_A_BUFFER BUFFER_SIZE+2
#define NO_MORE_BUFFER_TO_READ BUFFER_SIZE+3
/**
* _NaluUnit
* 内部结构体。该结构体主要用于存储和传递Nal单元的类型、大小和数据
*/
typedef struct _NaluUnit
{
int type;
int size;
unsigned char *data;
}NaluUnit;
/**
* _RTMPMetadata
* 内部结构体。该结构体主要用于存储和传递元数据信息
*/
typedef struct _RTMPMetadata
{
// video, must be h264 type
unsigned int nWidth;
unsigned int nHeight;
unsigned int nFrameRate;
unsigned int nSpsLen;
unsigned char *Sps;
unsigned int nPpsLen;
unsigned char *Pps;
} RTMPMetadata,*LPRTMPMetadata;
enum
{
VIDEO_CODECID_H264 = 7,
};
/**
* 初始化winsock
*
* @成功则返回1 , 失败则返回相应错误代码
*/
int InitSockets()
{
#ifdef WIN32
WORD version;
WSADATA wsaData;
version = MAKEWORD(1, 1);
return (WSAStartup(version, &wsaData) == 0);
#else
return TRUE;
#endif
}
/**
* 释放winsock
*
* @成功则返回0 , 失败则返回相应错误代码
*/
inline void CleanupSockets()
{
#ifdef WIN32
WSACleanup();
#endif
}
//网络字节序转换
char * put_byte( char *output, uint8_t nVal )
{
output[0] = nVal;
return output+1;
}
char * put_be16(char *output, uint16_t nVal )
{
output[1] = nVal & 0xff;
output[0] = nVal >> 8;
return output+2;
}
char * put_be24(char *output,uint32_t nVal )
{
output[2] = nVal & 0xff;
output[1] = nVal >> 8;
output[0] = nVal >> 16;
return output+3;
}
char * put_be32(char *output, uint32_t nVal )
{
output[3] = nVal & 0xff;
output[2] = nVal >> 8;
output[1] = nVal >> 16;
output[0] = nVal >> 24;
return output+4;
}
char * put_be64( char *output, uint64_t nVal )
{
output=put_be32( output, nVal >> 32 );
output=put_be32( output, nVal );
return output;
}
char * put_amf_string( char *c, const char *str )
{
uint16_t len = strlen( str );
c=put_be16( c, len );
memcpy(c,str,len);
return c+len;
}
char * put_amf_double( char *c, double d )
{
*c++ = AMF_NUMBER; /* type: Number */
{
unsigned char *ci, *co;
ci = (unsigned char *)&d;
co = (unsigned char *)c;
co[0] = ci[7];
co[1] = ci[6];
co[2] = ci[5];
co[3] = ci[4];
co[4] = ci[3];
co[5] = ci[2];
co[6] = ci[1];
co[7] = ci[0];
}
return c+8;
}
unsigned int m_nFileBufSize;
unsigned int nalhead_pos;
RTMP* m_pRtmp;
RTMPMetadata metaData;
unsigned char *m_pFileBuf;
unsigned char *m_pFileBuf_tmp;
unsigned char* m_pFileBuf_tmp_old; //used for realloc
/**
* 初始化并连接到服务器
*
* @param url 服务器上对应webapp的地址
*
* @成功则返回1 , 失败则返回0
*/
int RTMP264_Connect(const char* url)
{
nalhead_pos=0;
m_nFileBufSize=BUFFER_SIZE;
m_pFileBuf=(unsigned char*)malloc(BUFFER_SIZE);
m_pFileBuf_tmp=(unsigned char*)malloc(BUFFER_SIZE);
InitSockets();
m_pRtmp = RTMP_Alloc();
RTMP_Init(m_pRtmp);
/*设置URL*/
if (RTMP_SetupURL(m_pRtmp,(char*)url) == FALSE)
{
RTMP_Free(m_pRtmp);
return false;
}
/*设置可写,即发布流,这个函数必须在连接前使用,否则无效*/
RTMP_EnableWrite(m_pRtmp);
/*连接服务器*/
if (RTMP_Connect(m_pRtmp, NULL) == FALSE)
{
RTMP_Free(m_pRtmp);
return false;
}
/*连接流*/
if (RTMP_ConnectStream(m_pRtmp,0) == FALSE)
{
RTMP_Close(m_pRtmp);
RTMP_Free(m_pRtmp);
return false;
}
return true;
}
/**
* 断开连接，释放相关的资源。
*
*/
void RTMP264_Close()
{
if(m_pRtmp)
{
RTMP_Close(m_pRtmp);
RTMP_Free(m_pRtmp);
m_pRtmp = NULL;
}
CleanupSockets();
if (m_pFileBuf != NULL)
{
free(m_pFileBuf);
}
if (m_pFileBuf_tmp != NULL)
{
free(m_pFileBuf_tmp);
}
}
/**
* 发送RTMP数据包
*
* @param nPacketType 数据类型
* @param data 存储数据内容
* @param size 数据大小
* @param nTimestamp 当前包的时间戳
*
* @成功则返回 1 , 失败则返回一个小于0的数
*/
int SendPacket(unsigned int nPacketType,unsigned char *data,unsigned int size,unsigned int nTimestamp)
{
RTMPPacket* packet;
/*分配包内存和初始化,len为包体长度*/
packet = (RTMPPacket *)malloc(RTMP_HEAD_SIZE+size);
memset(packet,0,RTMP_HEAD_SIZE);
/*包体内存*/
packet->m_body = (char *)packet + RTMP_HEAD_SIZE;
packet->m_nBodySize = size;
memcpy(packet->m_body,data,size);
packet->m_hasAbsTimestamp = 0;
packet->m_packetType = nPacketType; /*此处为类型有两种一种是音频,一种是视频*/
packet->m_nInfoField2 = m_pRtmp->m_stream_id;
packet->m_nChannel = 0x04;
packet->m_headerType = RTMP_PACKET_SIZE_LARGE;
if (RTMP_PACKET_TYPE_AUDIO ==nPacketType && size !=4)
{
packet->m_headerType = RTMP_PACKET_SIZE_MEDIUM;
}
packet->m_nTimeStamp = nTimestamp;
/*发送*/
int nRet =0;
if (RTMP_IsConnected(m_pRtmp))
{
nRet = RTMP_SendPacket(m_pRtmp,packet,TRUE); /*TRUE为放进发送队列,FALSE是不放进发送队列,直接发送*/
}
/*释放内存*/
free(packet);
return nRet;
}
/**
* 发送视频的sps和pps信息
*
* @param pps 存储视频的pps信息
* @param pps_len 视频的pps信息长度
* @param sps 存储视频的pps信息
* @param sps_len 视频的sps信息长度
*
* @成功则返回 1 , 失败则返回0
*/
int SendVideoSpsPps(unsigned char *pps,int pps_len,unsigned char * sps,int sps_len)
{
RTMPPacket * packet=NULL;//rtmp包结构
unsigned char * body=NULL;
int i;
packet = (RTMPPacket *)malloc(RTMP_HEAD_SIZE+1024);
//RTMPPacket_Reset(packet);//重置packet状态
memset(packet,0,RTMP_HEAD_SIZE+1024);
packet->m_body = (char *)packet + RTMP_HEAD_SIZE;
body = (unsigned char *)packet->m_body;
i = 0;
body[i++] = 0x17;
body[i++] = 0x00;
body[i++] = 0x00;
body[i++] = 0x00;
body[i++] = 0x00;
/*AVCDecoderConfigurationRecord*/
body[i++] = 0x01;
body[i++] = sps[1];
body[i++] = sps[2];
body[i++] = sps[3];
body[i++] = 0xff;
/*sps*/
body[i++] = 0xe1;
body[i++] = (sps_len >> 8) & 0xff;
body[i++] = sps_len & 0xff;
memcpy(&body[i],sps,sps_len);
i += sps_len;
/*pps*/
body[i++] = 0x01;
body[i++] = (pps_len >> 8) & 0xff;
body[i++] = (pps_len) & 0xff;
memcpy(&body[i],pps,pps_len);
i += pps_len;
packet->m_packetType = RTMP_PACKET_TYPE_VIDEO;
packet->m_nBodySize = i;
packet->m_nChannel = 0x04;
packet->m_nTimeStamp = 0;
packet->m_hasAbsTimestamp = 0;
packet->m_headerType = RTMP_PACKET_SIZE_MEDIUM;
packet->m_nInfoField2 = m_pRtmp->m_stream_id;
/*调用发送接口*/
int nRet = RTMP_SendPacket(m_pRtmp,packet,TRUE);
free(packet); //释放内存
return nRet;
}
/**
* 发送H264数据帧
*
* @param data 存储数据帧内容
* @param size 数据帧的大小
* @param bIsKeyFrame 记录该帧是否为关键帧
* @param nTimeStamp 当前帧的时间戳
*
* @成功则返回 1 , 失败则返回0
*/
int SendH264Packet(unsigned char *data,unsigned int size,int bIsKeyFrame,unsigned int nTimeStamp)
{
if(data == NULL && size<11){
return false;
}
unsigned char *body = (unsigned char*)malloc(size+9);
memset(body,0,size+9);
int i = 0;
if(bIsKeyFrame){
body[i++] = 0x17;// 1:Iframe 7:AVC
body[i++] = 0x01;// AVC NALU
body[i++] = 0x00;
body[i++] = 0x00;
body[i++] = 0x00;
// NALU size
body[i++] = size>>24 &0xff;
body[i++] = size>>16 &0xff;
body[i++] = size>>8 &0xff;
body[i++] = size&0xff;
// NALU data
memcpy(&body[i],data,size);
SendVideoSpsPps(metaData.Pps,metaData.nPpsLen,metaData.Sps,metaData.nSpsLen);
}else{
body[i++] = 0x27;// 2:Pframe 7:AVC
body[i++] = 0x01;// AVC NALU
body[i++] = 0x00;
body[i++] = 0x00;
body[i++] = 0x00;
// NALU size
body[i++] = size>>24 &0xff;
body[i++] = size>>16 &0xff;
body[i++] = size>>8 &0xff;
body[i++] = size&0xff;
// NALU data
memcpy(&body[i],data,size);
}
int bRet = SendPacket(RTMP_PACKET_TYPE_VIDEO,body,i+size,nTimeStamp);
free(body);
return bRet;
}
/**
* 从内存中读取出第一个Nal单元
*
* @param nalu 存储nalu数据
* @param read_buffer 回调函数，当数据不足的时候，系统会自动调用该函数获取输入数据。
* 2个参数功能：
* uint8_t *buf：外部数据送至该地址
* int buf_size：外部数据大小
* 返回值：成功读取的内存大小
* @成功则返回 1 , 失败则返回0
*/
int ReadFirstNaluFromBuf(NaluUnit &nalu,int (*read_buffer)(uint8_t *buf, int buf_size))
{
int naltail_pos=nalhead_pos;
memset(m_pFileBuf_tmp,0,BUFFER_SIZE);
while(nalhead_pos<m_nFileBufSize)
{
//search for nal header
if(m_pFileBuf[nalhead_pos++] == 0x00 &&
m_pFileBuf[nalhead_pos++] == 0x00)
{
if(m_pFileBuf[nalhead_pos++] == 0x01)
goto gotnal_head;
else
{
//cuz we have done an i++ before,so we need to roll back now
nalhead_pos--;
if(m_pFileBuf[nalhead_pos++] == 0x00 &&
m_pFileBuf[nalhead_pos++] == 0x01)
goto gotnal_head;
else
continue;
}
}
else
continue;
//search for nal tail which is also the head of next nal
gotnal_head:
//normal case:the whole nal is in this m_pFileBuf
naltail_pos = nalhead_pos;
while (naltail_pos<m_nFileBufSize)
{
if(m_pFileBuf[naltail_pos++] == 0x00 &&
m_pFileBuf[naltail_pos++] == 0x00 )
{
if(m_pFileBuf[naltail_pos++] == 0x01)
{
nalu.size = (naltail_pos-3)-nalhead_pos;
break;
}
else
{
naltail_pos--;
if(m_pFileBuf[naltail_pos++] == 0x00 &&
m_pFileBuf[naltail_pos++] == 0x01)
{
nalu.size = (naltail_pos-4)-nalhead_pos;
break;
}
}
}
}
nalu.type = m_pFileBuf[nalhead_pos]&0x1f;
memcpy(m_pFileBuf_tmp,m_pFileBuf+nalhead_pos,nalu.size);
nalu.data=m_pFileBuf_tmp;
nalhead_pos=naltail_pos;
return TRUE;
}
}
/**
* 从内存中读取出一个Nal单元
*
* @param nalu 存储nalu数据
* @param read_buffer 回调函数，当数据不足的时候，系统会自动调用该函数获取输入数据。
* 2个参数功能：
* uint8_t *buf：外部数据送至该地址
* int buf_size：外部数据大小
* 返回值：成功读取的内存大小
* @成功则返回 1 , 失败则返回0
*/
int ReadOneNaluFromBuf(NaluUnit &nalu,int (*read_buffer)(uint8_t *buf, int buf_size))
{
int naltail_pos=nalhead_pos;
int ret;
int nalustart;//nal的开始标识符是几个00
memset(m_pFileBuf_tmp,0,BUFFER_SIZE);
nalu.size=0;
while(1)
{
if(nalhead_pos==NO_MORE_BUFFER_TO_READ)
return FALSE;
while(naltail_pos<m_nFileBufSize)
{
//search for nal tail
if(m_pFileBuf[naltail_pos++] == 0x00 &&
m_pFileBuf[naltail_pos++] == 0x00)
{
if(m_pFileBuf[naltail_pos++] == 0x01)
{
nalustart=3;
goto gotnal ;
}
else
{
//cuz we have done an i++ before,so we need to roll back now
naltail_pos--;
if(m_pFileBuf[naltail_pos++] == 0x00 &&
m_pFileBuf[naltail_pos++] == 0x01)
{
nalustart=4;
goto gotnal;
}
else
continue;
}
}
else
continue;
gotnal:
/**
*special case1:parts of the nal lies in a m_pFileBuf and we have to read from buffer
*again to get the rest part of this nal
*/
if(nalhead_pos==GOT_A_NAL_CROSS_BUFFER || nalhead_pos==GOT_A_NAL_INCLUDE_A_BUFFER)
{
nalu.size = nalu.size+naltail_pos-nalustart;
if(nalu.size>BUFFER_SIZE)
{
m_pFileBuf_tmp_old=m_pFileBuf_tmp; save pointer in case realloc fails
if((m_pFileBuf_tmp = (unsigned char*)realloc(m_pFileBuf_tmp,nalu.size)) == NULL )
{
free( m_pFileBuf_tmp_old ); // free original block
return FALSE;
}
}
memcpy(m_pFileBuf_tmp+nalu.size+nalustart-naltail_pos,m_pFileBuf,naltail_pos-nalustart);
nalu.data=m_pFileBuf_tmp;
nalhead_pos=naltail_pos;
return TRUE;
}
//normal case:the whole nal is in this m_pFileBuf
else
{
nalu.type = m_pFileBuf[nalhead_pos]&0x1f;
nalu.size=naltail_pos-nalhead_pos-nalustart;
if(nalu.type==0x06)
{
nalhead_pos=naltail_pos;
continue;
}
memcpy(m_pFileBuf_tmp,m_pFileBuf+nalhead_pos,nalu.size);
nalu.data=m_pFileBuf_tmp;
nalhead_pos=naltail_pos;
return TRUE;
}
}
if(naltail_pos>=m_nFileBufSize && nalhead_pos!=GOT_A_NAL_CROSS_BUFFER && nalhead_pos != GOT_A_NAL_INCLUDE_A_BUFFER)
{
nalu.size = BUFFER_SIZE-nalhead_pos;
nalu.type = m_pFileBuf[nalhead_pos]&0x1f;
memcpy(m_pFileBuf_tmp,m_pFileBuf+nalhead_pos,nalu.size);
if((ret=read_buffer(m_pFileBuf,m_nFileBufSize))<BUFFER_SIZE)
{
memcpy(m_pFileBuf_tmp+nalu.size,m_pFileBuf,ret);
nalu.size=nalu.size+ret;
nalu.data=m_pFileBuf_tmp;
nalhead_pos=NO_MORE_BUFFER_TO_READ;
return FALSE;
}
naltail_pos=0;
nalhead_pos=GOT_A_NAL_CROSS_BUFFER;
continue;
}
if(nalhead_pos==GOT_A_NAL_CROSS_BUFFER || nalhead_pos == GOT_A_NAL_INCLUDE_A_BUFFER)
{
nalu.size = BUFFER_SIZE+nalu.size;
m_pFileBuf_tmp_old=m_pFileBuf_tmp; save pointer in case realloc fails
if((m_pFileBuf_tmp = (unsigned char*)realloc(m_pFileBuf_tmp,nalu.size)) == NULL )
{
free( m_pFileBuf_tmp_old ); // free original block
return FALSE;
}
memcpy(m_pFileBuf_tmp+nalu.size-BUFFER_SIZE,m_pFileBuf,BUFFER_SIZE);
if((ret=read_buffer(m_pFileBuf,m_nFileBufSize))<BUFFER_SIZE)
{
memcpy(m_pFileBuf_tmp+nalu.size,m_pFileBuf,ret);
nalu.size=nalu.size+ret;
nalu.data=m_pFileBuf_tmp;
nalhead_pos=NO_MORE_BUFFER_TO_READ;
return FALSE;
}
naltail_pos=0;
nalhead_pos=GOT_A_NAL_INCLUDE_A_BUFFER;
continue;
}
}
return FALSE;
}
/**
* 将内存中的一段H.264编码的视频数据利用RTMP协议发送到服务器
*
* @param read_buffer 回调函数，当数据不足的时候，系统会自动调用该函数获取输入数据。
* 2个参数功能：
* uint8_t *buf：外部数据送至该地址
* int buf_size：外部数据大小
* 返回值：成功读取的内存大小
* @成功则返回1 , 失败则返回0
*/
int RTMP264_Send(int (*read_buffer)(unsigned char *buf, int buf_size))
{
int ret;
uint32_t now,last_update;
memset(&metaData,0,sizeof(RTMPMetadata));
memset(m_pFileBuf,0,BUFFER_SIZE);
if((ret=read_buffer(m_pFileBuf,m_nFileBufSize))<0)
{
return FALSE;
}
NaluUnit naluUnit;
// 读取SPS帧
ReadFirstNaluFromBuf(naluUnit,read_buffer);
metaData.nSpsLen = naluUnit.size;
metaData.Sps=NULL;
metaData.Sps=(unsigned char*)malloc(naluUnit.size);
memcpy(metaData.Sps,naluUnit.data,naluUnit.size);
// 读取PPS帧
ReadOneNaluFromBuf(naluUnit,read_buffer);
metaData.nPpsLen = naluUnit.size;
metaData.Pps=NULL;
metaData.Pps=(unsigned char*)malloc(naluUnit.size);
memcpy(metaData.Pps,naluUnit.data,naluUnit.size);
// 解码SPS,获取视频图像宽、高信息
int width = 0,height = 0, fps=0;
h264_decode_sps(metaData.Sps,metaData.nSpsLen,width,height,fps);
//metaData.nWidth = width;
//metaData.nHeight = height;
if(fps)
metaData.nFrameRate = fps;
else
metaData.nFrameRate = 25;
//发送PPS,SPS
//ret=SendVideoSpsPps(metaData.Pps,metaData.nPpsLen,metaData.Sps,metaData.nSpsLen);
//if(ret!=1)
// return FALSE;
unsigned int tick = 0;
unsigned int tick_gap = 1000/metaData.nFrameRate;
ReadOneNaluFromBuf(naluUnit,read_buffer);
int bKeyframe = (naluUnit.type == 0x05) ? TRUE : FALSE;
while(SendH264Packet(naluUnit.data,naluUnit.size,bKeyframe,tick))
{
got_sps_pps:
//if(naluUnit.size==8581)
printf("NALU size:%8d\n",naluUnit.size);
last_update=RTMP_GetTime();
if(!ReadOneNaluFromBuf(naluUnit,read_buffer))
goto end;
if(naluUnit.type == 0x07 || naluUnit.type == 0x08)
goto got_sps_pps;
bKeyframe = (naluUnit.type == 0x05) ? TRUE : FALSE;
tick +=tick_gap;
now=RTMP_GetTime();
usleep((tick_gap-now+last_update)*1000);
//msleep(40);
}
end:
free(metaData.Sps);
free(metaData.Pps);
return TRUE;
}
librtmp_send264.h
/**
* 初始化并连接到服务器
*
* @param url 服务器上对应webapp的地址
*
* @成功则返回1 , 失败则返回0
*/
int RTMP264_Connect(const char* url);
/**
* 将内存中的一段H.264编码的视频数据利用RTMP协议发送到服务器
*
* @param read_buffer 回调函数，当数据不足的时候，系统会自动调用该函数获取输入数据。
* 2个参数功能：
* uint8_t *buf：外部数据送至该地址
* int buf_size：外部数据大小
* 返回值：成功读取的内存大小
* @成功则返回1 , 失败则返回0
*/
int RTMP264_Send(int (*read_buffer)(unsigned char *buf, int buf_size));
/**
* 断开连接，释放相关的资源。
*
*/
void RTMP264_Close();
sps_decode.h
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
typedef unsigned int UINT;
typedef unsigned char BYTE;
typedef unsigned long DWORD;
UINT Ue(BYTE *pBuff, UINT nLen, UINT &nStartBit)
{
//计算0bit的个数
UINT nZeroNum = 0;
while (nStartBit < nLen * 8)
{
if (pBuff[nStartBit / 8] & (0x80 >> (nStartBit % 8))) //&:按位与，%取余
{
break;
}
nZeroNum++;
nStartBit++;
}
nStartBit ++;
//计算结果
DWORD dwRet = 0;
for (UINT i=0; i<nZeroNum; i++)
{
dwRet <<= 1;
if (pBuff[nStartBit / 8] & (0x80 >> (nStartBit % 8)))
{
dwRet += 1;
}
nStartBit++;
}
return (1 << nZeroNum) - 1 + dwRet;
}
int Se(BYTE *pBuff, UINT nLen, UINT &nStartBit)
{
int UeVal=Ue(pBuff,nLen,nStartBit);
double k=UeVal;
int nValue=ceil(k/2);//ceil函数：ceil函数的作用是求不小于给定实数的最小整数。ceil(2)=ceil(1.2)=cei(1.5)=2.00
if (UeVal % 2==0)
nValue=-nValue;
return nValue;
}
DWORD u(UINT BitCount,BYTE * buf,UINT &nStartBit)
{
DWORD dwRet = 0;
for (UINT i=0; i<BitCount; i++)
{
dwRet <<= 1;
if (buf[nStartBit / 8] & (0x80 >> (nStartBit % 8)))
{
dwRet += 1;
}
nStartBit++;
}
return dwRet;
}
/**
* H264的NAL起始码防竞争机制
*
* @param buf SPS数据内容
*
* @无返回值
*/
void de_emulation_prevention(BYTE* buf,unsigned int* buf_size)
{
int i=0,j=0;
BYTE* tmp_ptr=NULL;
unsigned int tmp_buf_size=0;
int val=0;
tmp_ptr=buf;
tmp_buf_size=*buf_size;
for(i=0;i<(tmp_buf_size-2);i++)
{
//check for 0x000003
val=(tmp_ptr[i]^0x00) +(tmp_ptr[i+1]^0x00)+(tmp_ptr[i+2]^0x03);
if(val==0)
{
//kick out 0x03
for(j=i+2;j<tmp_buf_size-1;j++)
tmp_ptr[j]=tmp_ptr[j+1];
//and so we should devrease bufsize
(*buf_size)--;
}
}
return;
}
/**
* 解码SPS,获取视频图像宽、高信息
*
* @param buf SPS数据内容
* @param nLen SPS数据的长度
* @param width 图像宽度
* @param height 图像高度
* @成功则返回1 , 失败则返回0
*/
int h264_decode_sps(BYTE * buf,unsigned int nLen,int &width,int &height,int &fps)
{
UINT StartBit=0;
fps=0;
de_emulation_prevention(buf,&nLen);
int forbidden_zero_bit=u(1,buf,StartBit);
int nal_ref_idc=u(2,buf,StartBit);
int nal_unit_type=u(5,buf,StartBit);
if(nal_unit_type==7)
{
int profile_idc=u(8,buf,StartBit);
int constraint_set0_flag=u(1,buf,StartBit);//(buf[1] & 0x80)>>7;
int constraint_set1_flag=u(1,buf,StartBit);//(buf[1] & 0x40)>>6;
int constraint_set2_flag=u(1,buf,StartBit);//(buf[1] & 0x20)>>5;
int constraint_set3_flag=u(1,buf,StartBit);//(buf[1] & 0x10)>>4;
int reserved_zero_4bits=u(4,buf,StartBit);
int level_idc=u(8,buf,StartBit);
int seq_parameter_set_id=Ue(buf,nLen,StartBit);
if( profile_idc == 100 || profile_idc == 110 ||
profile_idc == 122 || profile_idc == 144 )
{
int chroma_format_idc=Ue(buf,nLen,StartBit);
if( chroma_format_idc == 3 )
int residual_colour_transform_flag=u(1,buf,StartBit);
int bit_depth_luma_minus8=Ue(buf,nLen,StartBit);
int bit_depth_chroma_minus8=Ue(buf,nLen,StartBit);
int qpprime_y_zero_transform_bypass_flag=u(1,buf,StartBit);
int seq_scaling_matrix_present_flag=u(1,buf,StartBit);
int seq_scaling_list_present_flag[8];
if( seq_scaling_matrix_present_flag )
{
for( int i = 0; i < 8; i++ ) {
seq_scaling_list_present_flag[i]=u(1,buf,StartBit);
}
}
}
int log2_max_frame_num_minus4=Ue(buf,nLen,StartBit);
int pic_order_cnt_type=Ue(buf,nLen,StartBit);
if( pic_order_cnt_type == 0 )
int log2_max_pic_order_cnt_lsb_minus4=Ue(buf,nLen,StartBit);
else if( pic_order_cnt_type == 1 )
{
int delta_pic_order_always_zero_flag=u(1,buf,StartBit);
int offset_for_non_ref_pic=Se(buf,nLen,StartBit);
int offset_for_top_to_bottom_field=Se(buf,nLen,StartBit);
int num_ref_frames_in_pic_order_cnt_cycle=Ue(buf,nLen,StartBit);
int *offset_for_ref_frame=new int[num_ref_frames_in_pic_order_cnt_cycle];
for( int i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++ )
offset_for_ref_frame[i]=Se(buf,nLen,StartBit);
delete [] offset_for_ref_frame;
}
int num_ref_frames=Ue(buf,nLen,StartBit);
int gaps_in_frame_num_value_allowed_flag=u(1,buf,StartBit);
int pic_width_in_mbs_minus1=Ue(buf,nLen,StartBit);
int pic_height_in_map_units_minus1=Ue(buf,nLen,StartBit);
width=(pic_width_in_mbs_minus1+1)*16;
height=(pic_height_in_map_units_minus1+1)*16;
int frame_mbs_only_flag=u(1,buf,StartBit);
if(!frame_mbs_only_flag)
int mb_adaptive_frame_field_flag=u(1,buf,StartBit);
int direct_8x8_inference_flag=u(1,buf,StartBit);
int frame_cropping_flag=u(1,buf,StartBit);
if(frame_cropping_flag)
{
int frame_crop_left_offset=Ue(buf,nLen,StartBit);
int frame_crop_right_offset=Ue(buf,nLen,StartBit);
int frame_crop_top_offset=Ue(buf,nLen,StartBit);
int frame_crop_bottom_offset=Ue(buf,nLen,StartBit);
}
int vui_parameter_present_flag=u(1,buf,StartBit);
if(vui_parameter_present_flag)
{
int aspect_ratio_info_present_flag=u(1,buf,StartBit);
if(aspect_ratio_info_present_flag)
{
int aspect_ratio_idc=u(8,buf,StartBit);
if(aspect_ratio_idc==255)
{
int sar_width=u(16,buf,StartBit);
int sar_height=u(16,buf,StartBit);
}
}
int overscan_info_present_flag=u(1,buf,StartBit);
if(overscan_info_present_flag)
int overscan_appropriate_flagu=u(1,buf,StartBit);
int video_signal_type_present_flag=u(1,buf,StartBit);
if(video_signal_type_present_flag)
{
int video_format=u(3,buf,StartBit);
int video_full_range_flag=u(1,buf,StartBit);
int colour_description_present_flag=u(1,buf,StartBit);
if(colour_description_present_flag)
{
int colour_primaries=u(8,buf,StartBit);
int transfer_characteristics=u(8,buf,StartBit);
int matrix_coefficients=u(8,buf,StartBit);
}
}
int chroma_loc_info_present_flag=u(1,buf,StartBit);
if(chroma_loc_info_present_flag)
{
int chroma_sample_loc_type_top_field=Ue(buf,nLen,StartBit);
int chroma_sample_loc_type_bottom_field=Ue(buf,nLen,StartBit);
}
int timing_info_present_flag=u(1,buf,StartBit);
if(timing_info_present_flag)
{
int num_units_in_tick=u(32,buf,StartBit);
int time_scale=u(32,buf,StartBit);
fps=time_scale/(2*num_units_in_tick);
}
}
return true;
}
else
return false;
}
Makefile
PRJ_PATH = .
TARGETS = video_prj
DIR_INC = ./inc
DIR_SRC = ./src
DIR_OBJ = ./obj
CXX = g++
SRC := $(wildcard ${DIR_SRC}/*.cpp)
OBJ := $(patsubst ${DIR_SRC}/%.cpp,$(DIR_OBJ)/%.o,$(SRC))
ZLIB_LIB_DIR = $(PRJ_PATH)/third_lib/zlib/lib
ZLIB_INC_DIR = $(PRJ_PATH)/third_lib/zlib/include
OPENSSL_LIB_DIR = $(PRJ_PATH)/third_lib/openssl/lib
OPENSSL_INC_DIR = $(PRJ_PATH)/third_lib/openssl/include
RTMP_LIB_DIR = $(PRJ_PATH)/third_lib/rtmpdump/lib
RTMP_INC_DIR = $(PRJ_PATH)/third_lib/rtmpdump/include
INCLUDES = -I$(DIR_INC)
INCLUDES += -I$(ZLIB_INC_DIR)
INCLUDES += -I$(OPENSSL_INC_DIR)
INCLUDES += -I$(RTMP_INC_DIR)
LDFLAGS = -lpthread
LDFLAGS += -L$(RTMP_LIB_DIR) -lrtmp
LDFLAGS += -L$(ZLIB_LIB_DIR) -lz
LDFLAGS += -L$(OPENSSL_LIB_DIR) -lcrypto -lssl
CXXFLAGS = -fpermissive
CXXFLAGS += -fPIC
CFLAGS += $(INCLUDES)
$(TARGETS):$(OBJ)
$(CXX) $^ -o $@ $(LDFLAGS) $(CXXFLAGS)
$(DIR_OBJ)/%.o:$(DIR_SRC)/%.cpp
$(CXX) $(CFLAGS) -c $< -o $@ $(CXXFLAGS)
clean:
rm -f $(TARGETS)
rm -f $(DIR_OBJ)/*.o
所有代码编写完后，编译代码，然后执行推流进程，进程就会往服务器推流。关于服务器的启动可参考
https://blog.csdn.net/sishen4199/article/details/133850730
另外本章内容，拉流的客户端作者使用的是vlc软件作为验证，关于vlc如何拉RTMP，本文不具体描述。