RTP打包发送H.264——纯代码,直接上
http://blog.csdn.net/bytxl/article/details/50463925
H264.h头文件内容:
- #include <stdio.h>
- #include <stdlib.h>
- #include <conio.h>
- #include <string.h>
- #include <winsock2.h>
- #pragma comment( lib, "ws2_32.lib" )
- #define PACKET_BUFFER_END (unsigned int)0x00000000
- #define MAX_RTP_PKT_LENGTH 1400
- #define DEST_IP "192.168.0.25"
- #define DEST_PORT 1234
- #define H264 96
- /******************************************************************
- RTP_FIXED_HEADER
- 0 1 2 3
- 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- |V=2|P|X| CC |M| PT | sequence number |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | timestamp |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | synchronization source (SSRC) identifier |
- +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
- | contributing source (CSRC) identifiers |
- | .... |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- ******************************************************************/
- typedef struct
- {
- /* byte 0 */
- unsigned char csrc_len:4; /* CC expect 0 */
- unsigned char extension:1;/* X expect 1, see RTP_OP below */
- unsigned char padding:1; /* P expect 0 */
- unsigned char version:2; /* V expect 2 */
- /* byte 1 */
- unsigned char payload:7; /* PT RTP_PAYLOAD_RTSP */
- unsigned char marker:1; /* M expect 1 */
- /* byte 2,3 */
- unsigned short seq_no; /*sequence number*/
- /* byte 4-7 */
- unsigned long timestamp;
- /* byte 8-11 */
- unsigned long ssrc; /* stream number is used here. */
- } RTP_FIXED_HEADER;/*12 bytes*/
- /******************************************************************
- NALU_HEADER
- +---------------+
- |0|1|2|3|4|5|6|7|
- +-+-+-+-+-+-+-+-+
- |F|NRI| Type |
- +---------------+
- ******************************************************************/
- typedef struct {
- //byte 0
- unsigned char TYPE:5;
- unsigned char NRI:2;
- unsigned char F:1;
- } NALU_HEADER; /* 1 byte */
- /******************************************************************
- FU_INDICATOR
- +---------------+
- |0|1|2|3|4|5|6|7|
- +-+-+-+-+-+-+-+-+
- |F|NRI| Type |
- +---------------+
- ******************************************************************/
- typedef struct {
- //byte 0
- unsigned char TYPE:5;
- unsigned char NRI:2;
- unsigned char F:1;
- } FU_INDICATOR; /*1 byte */
- /******************************************************************
- FU_HEADER
- +---------------+
- |0|1|2|3|4|5|6|7|
- +-+-+-+-+-+-+-+-+
- |S|E|R| Type |
- +---------------+
- ******************************************************************/
- typedef struct {
- //byte 0
- unsigned char TYPE:5;
- unsigned char R:1;
- unsigned char E:1;
- unsigned char S:1;
- } FU_HEADER; /* 1 byte */
RTPSend.cpp文件内容:
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <memory.h>
- #include "h264.h"
- #define UDP_MAX_SIZE 1400
- typedef struct
- {
- int startcodeprefix_len; //! 4 for parameter sets and first slice in picture, 3 for everything else (suggested)
- unsigned len; //! Length of the NAL unit (Excluding the start code, which does not belong to the NALU)
- unsigned max_size; //! Nal Unit Buffer size
- int forbidden_bit; //! should be always FALSE
- int nal_reference_idc; //! NALU_PRIORITY_xxxx
- int nal_unit_type; //! NALU_TYPE_xxxx
- char *buf; //! contains the first byte followed by the EBSP
- unsigned short lost_packets; //! true, if packet loss is detected
- } NALU_t;
- FILE *bits = NULL; //!< the bit stream file
- static int FindStartCode2(unsigned char *Buf);//查找开始字符0x000001
- static int FindStartCode3(unsigned char *Buf);//查找开始字符0x00000001
- static int info2=0, info3=0;
- RTP_FIXED_HEADER *rtp_hdr;
- NALU_HEADER *nalu_hdr;
- FU_INDICATOR *fu_ind;
- FU_HEADER *fu_hdr;
- BOOL InitWinsock()
- {
- int Error;
- WORD VersionRequested;
- WSADATA WsaData;
- VersionRequested=MAKEWORD(2,2);
- Error=WSAStartup(VersionRequested,&WsaData); //启动WinSock2
- if(Error!=0)
- {
- return FALSE;
- }
- else
- {
- if(LOBYTE(WsaData.wVersion)!=2||HIBYTE(WsaData.wHighVersion)!=2)
- {
- WSACleanup();
- return FALSE;
- }
- }
- return TRUE;
- }
- //为NALU_t结构体分配内存空间
- NALU_t *AllocNALU(int buffersize)
- {
- NALU_t *n;
- if ((n = (NALU_t*)calloc (1, sizeof (NALU_t))) == NULL)
- {
- printf("AllocNALU: n");
- exit(0);
- }
- n->max_size=buffersize;
- if ((n->buf = (char*)calloc (buffersize, sizeof (char))) == NULL)
- {
- free (n);
- printf ("AllocNALU: n->buf");
- exit(0);
- }
- return n;
- }
- //释放
- void FreeNALU(NALU_t *n)
- {
- if (n)
- {
- if (n->buf)
- {
- free(n->buf);
- n->buf=NULL;
- }
- free (n);
- }
- }
- void OpenBitstreamFile (char *fn)
- {
- if (NULL == (bits=fopen(fn, "rb")))
- {
- printf("open file error\n");
- exit(0);
- }
- }
- //这个函数输入为一个NAL结构体,主要功能为得到一个完整的NALU并保存在NALU_t的buf中,
- //获取他的长度,填充F,IDC,TYPE位。
- //并且返回两个开始字符之间间隔的字节数,即包含有前缀的NALU的长度
- int GetAnnexbNALU (NALU_t *nalu)
- {
- int pos = 0;
- int StartCodeFound, rewind;
- unsigned char *Buf;
- if ((Buf = (unsigned char*)calloc (nalu->max_size , sizeof(char))) == NULL)
- printf ("GetAnnexbNALU: Could not allocate Buf memory\n");
- nalu->startcodeprefix_len=3;//初始化码流序列的开始字符为3个字节
- if (3 != fread (Buf, 1, 3, bits))//从码流中读3个字节
- {
- free(Buf);
- return 0;
- }
- info2 = FindStartCode2 (Buf);//判断是否为0x000001
- if(info2 != 1)
- {
- //如果不是,再读一个字节
- if(1 != fread(Buf+3, 1, 1, bits))//读一个字节
- {
- free(Buf);
- return 0;
- }
- info3 = FindStartCode3 (Buf);//判断是否为0x00000001
- if (info3 != 1)//如果不是,返回-1
- {
- free(Buf);
- return -1;
- }
- else
- {
- //如果是0x00000001,得到开始前缀为4个字节
- pos = 4;
- nalu->startcodeprefix_len = 4;
- }
- }
- else
- {
- //如果是0x000001,得到开始前缀为3个字节
- nalu->startcodeprefix_len = 3;
- pos = 3;
- }
- //查找下一个开始字符的标志位
- StartCodeFound = 0;
- info2 = 0;
- info3 = 0;
- while (!StartCodeFound)
- {
- if (feof (bits))//判断是否到了文件尾
- {
- nalu->len = (pos-1)-nalu->startcodeprefix_len;
- memcpy (nalu->buf, &Buf[nalu->startcodeprefix_len], nalu->len);
- nalu->forbidden_bit = nalu->buf[0] & 0x80; //1 bit
- nalu->nal_reference_idc = nalu->buf[0] & 0x60; // 2 bit
- nalu->nal_unit_type = (nalu->buf[0]) & 0x1f;// 5 bit
- free(Buf);
- return pos-1;
- }
- Buf[pos++] = fgetc (bits);//读一个字节到BUF中
- info3 = FindStartCode3(&Buf[pos-4]);//判断是否为0x00000001
- if(info3 != 1)
- info2 = FindStartCode2(&Buf[pos-3]);//判断是否为0x000001
- StartCodeFound = (info2 == 1 || info3 == 1);
- }
- // Here, we have found another start code (and read length of startcode bytes more than we should
- // have. Hence, go back in the file
- rewind = (info3 == 1)? -4 : -3;
- if (0 != fseek (bits, rewind, SEEK_CUR))//把文件指针指向前一个NALU的末尾
- {
- free(Buf);
- printf("GetAnnexbNALU: Cannot fseek in the bit stream file");
- }
- // Here the Start code, the complete NALU, and the next start code is in the Buf.
- // The size of Buf is pos, pos+rewind are the number of bytes excluding the next
- // start code, and (pos+rewind)-startcodeprefix_len is the size of the NALU excluding the start code
- nalu->len = (pos+rewind)-nalu->startcodeprefix_len;
- memcpy (nalu->buf, &Buf[nalu->startcodeprefix_len], nalu->len);//拷贝一个完整NALU,不拷贝起始前缀0x000001或0x00000001
- nalu->forbidden_bit = nalu->buf[0] & 0x80; //1 bit
- nalu->nal_reference_idc = nalu->buf[0] & 0x60; //2 bit
- nalu->nal_unit_type = (nalu->buf[0]) & 0x1f; //5 bit
- free(Buf);
- return (pos+rewind);//返回两个开始字符之间间隔的字节数,即包含有前缀的NALU的长度
- }
- static int FindStartCode2 (unsigned char *Buf)
- {
- if(Buf[0]!=0 || Buf[1]!=0 || Buf[2] !=1) return 0; //判断是否为0x000001,如果是返回1
- else return 1;
- }
- static int FindStartCode3 (unsigned char *Buf)
- {
- if(Buf[0]!=0 || Buf[1]!=0 || Buf[2] !=0 || Buf[3] !=1) return 0;//判断是否为0x00000001,如果是返回1
- else return 1;
- }
- int rtpnum = 0;
- //输出NALU长度和TYPE
- void dump(NALU_t *n)
- {
- if (!n)return;
- printf("%3d, len: %6d ",rtpnum++, n->len);
- printf("nal_unit_type: %x\n", n->nal_unit_type);
- }
- int main(int argc, char* argv[])
- {
- OpenBitstreamFile("E:\\测试数据\\tv480x320.264");
- NALU_t *n;
- char* nalu_payload;
- char sendbuf[1500];
- unsigned short seq_num =0;
- int bytes=0;
- InitWinsock(); //初始化套接字库
- SOCKET socket1;
- struct sockaddr_in server;
- int len =sizeof(server);
- float framerate=15;
- unsigned int timestamp_increse=0,ts_current=0;
- timestamp_increse=(unsigned int)(90000.0 / framerate); //+0.5);
- server.sin_family=AF_INET;
- server.sin_port=htons(DEST_PORT);
- server.sin_addr.s_addr=inet_addr(DEST_IP);
- socket1=socket(AF_INET,SOCK_DGRAM,0);
- connect(socket1, (const sockaddr *)&server, len) ;//申请UDP套接字
- n = AllocNALU(8000000);//为结构体nalu_t及其成员buf分配空间。返回值为指向nalu_t存储空间的指针
- while(!feof(bits))
- {
- GetAnnexbNALU(n);//每执行一次,文件的指针指向本次找到的NALU的末尾,下一个位置即为下个NALU的起始码0x000001
- dump(n);//输出NALU长度和TYPE
- memset(sendbuf,0,1500);//清空sendbuf;此时会将上次的时间戳清空,因此需要ts_current来保存上次的时间戳值
- //rtp固定包头,为12字节,该句将sendbuf[0]的地址赋给rtp_hdr,以后对rtp_hdr的写入操作将直接写入sendbuf。
- rtp_hdr =(RTP_FIXED_HEADER*)&sendbuf[0];
- //设置RTP HEADER,
- rtp_hdr->version = 2; //版本号,此版本固定为2
- rtp_hdr->marker = 0; //标志位,由具体协议规定其值。
- rtp_hdr->payload = H264;//负载类型号,
- rtp_hdr->ssrc = htonl(10);//随机指定为10,并且在本RTP会话中全局唯一
- //当一个NALU小于1400字节的时候,采用一个单RTP包发送
- if(n->len<=UDP_MAX_SIZE){
- //设置rtp M 位;
- rtp_hdr->marker=1;
- rtp_hdr->seq_no = htons(seq_num ++); //序列号,每发送一个RTP包增1
- //设置NALU HEADER,并将这个HEADER填入sendbuf[12]
- nalu_hdr =(NALU_HEADER*)&sendbuf[12]; //将sendbuf[12]的地址赋给nalu_hdr,之后对nalu_hdr的写入就将写入sendbuf中;
- nalu_hdr->F=n->forbidden_bit;
- nalu_hdr->NRI=n->nal_reference_idc>>5;//有效数据在n->nal_reference_idc的第6,7位,需要右移5位才能将其值赋给nalu_hdr->NRI。
- nalu_hdr->TYPE=n->nal_unit_type;
- nalu_payload=&sendbuf[13];//同理将sendbuf[13]赋给nalu_payload
- memcpy(nalu_payload,n->buf+1,n->len-1);//去掉nalu头的nalu剩余内容写入sendbuf[13]开始的字符串。
- ts_current=ts_current+timestamp_increse;
- rtp_hdr->timestamp=htonl(ts_current);
- bytes=n->len + 12 ; //获得sendbuf的长度,为nalu的长度(包含NALU头但除去起始前缀)加上rtp_header的固定长度12字节
- send(socket1,sendbuf,bytes,0);//发送RTP包
- //Sleep(100);
- }else{
- int packetNum = n->len/UDP_MAX_SIZE;
- if (n->len%UDP_MAX_SIZE != 0)
- packetNum ++;
- int lastPackSize = n->len - (packetNum-1)*UDP_MAX_SIZE;
- int packetIndex = 1 ;
- ts_current=ts_current+timestamp_increse;
- rtp_hdr->timestamp=htonl(ts_current);
- //发送第一个的FU,S=1,E=0,R=0
- rtp_hdr->seq_no = htons(seq_num ++); //序列号,每发送一个RTP包增1
- //设置rtp M 位;
- rtp_hdr->marker=0;
- //设置FU INDICATOR,并将这个HEADER填入sendbuf[12]
- fu_ind =(FU_INDICATOR*)&sendbuf[12]; //将sendbuf[12]的地址赋给fu_ind,之后对fu_ind的写入就将写入sendbuf中;
- fu_ind->F=n->forbidden_bit;
- fu_ind->NRI=n->nal_reference_idc>>5;
- fu_ind->TYPE=28;
- //设置FU HEADER,并将这个HEADER填入sendbuf[13]
- fu_hdr =(FU_HEADER*)&sendbuf[13];
- fu_hdr->S=1;
- fu_hdr->E=0;
- fu_hdr->R=0;
- fu_hdr->TYPE=n->nal_unit_type;
- nalu_payload=&sendbuf[14];//同理将sendbuf[14]赋给nalu_payload
- memcpy(nalu_payload,n->buf+1,UDP_MAX_SIZE);//去掉NALU头
- bytes=UDP_MAX_SIZE+14;//获得sendbuf的长度,为nalu的长度(除去起始前缀和NALU头)加上rtp_header,fu_ind,fu_hdr的固定长度14字节
- send( socket1, sendbuf, bytes, 0 );//发送RTP包
- //发送中间的FU,S=0,E=0,R=0
- for(packetIndex=2;packetIndex<packetNum;packetIndex++)
- {
- rtp_hdr->seq_no = htons(seq_num ++); //序列号,每发送一个RTP包增1
- //设置rtp M 位;
- rtp_hdr->marker=0;
- //设置FU INDICATOR,并将这个HEADER填入sendbuf[12]
- fu_ind =(FU_INDICATOR*)&sendbuf[12]; //将sendbuf[12]的地址赋给fu_ind,之后对fu_ind的写入就将写入sendbuf中;
- fu_ind->F=n->forbidden_bit;
- fu_ind->NRI=n->nal_reference_idc>>5;
- fu_ind->TYPE=28;
- //设置FU HEADER,并将这个HEADER填入sendbuf[13]
- fu_hdr =(FU_HEADER*)&sendbuf[13];
- fu_hdr->S=0;
- fu_hdr->E=0;
- fu_hdr->R=0;
- fu_hdr->TYPE=n->nal_unit_type;
- nalu_payload=&sendbuf[14];//同理将sendbuf[14]的地址赋给nalu_payload
- memcpy(nalu_payload,n->buf+(packetIndex-1)*UDP_MAX_SIZE+1,UDP_MAX_SIZE);//去掉起始前缀的nalu剩余内容写入sendbuf[14]开始的字符串。
- bytes=UDP_MAX_SIZE+14;//获得sendbuf的长度,为nalu的长度(除去原NALU头)加上rtp_header,fu_ind,fu_hdr的固定长度14字节
- send( socket1, sendbuf, bytes, 0 );//发送rtp包
- }
- //发送最后一个的FU,S=0,E=1,R=0
- rtp_hdr->seq_no = htons(seq_num ++);
- //设置rtp M 位;当前传输的是最后一个分片时该位置1
- rtp_hdr->marker=1;
- //设置FU INDICATOR,并将这个HEADER填入sendbuf[12]
- fu_ind =(FU_INDICATOR*)&sendbuf[12]; //将sendbuf[12]的地址赋给fu_ind,之后对fu_ind的写入就将写入sendbuf中;
- fu_ind->F=n->forbidden_bit;
- fu_ind->NRI=n->nal_reference_idc>>5;
- fu_ind->TYPE=28;
- //设置FU HEADER,并将这个HEADER填入sendbuf[13]
- fu_hdr =(FU_HEADER*)&sendbuf[13];
- fu_hdr->S=0;
- fu_hdr->E=1;
- fu_hdr->R=0;
- fu_hdr->TYPE=n->nal_unit_type;
- nalu_payload=&sendbuf[14];//同理将sendbuf[14]的地址赋给nalu_payload
- memcpy(nalu_payload,n->buf+(packetIndex-1)*UDP_MAX_SIZE+1,lastPackSize-1);//将nalu最后剩余的-1(去掉了一个字节的NALU头)字节内容写入sendbuf[14]开始的字符串。
- bytes=lastPackSize-1+14;//获得sendbuf的长度,为剩余nalu的长度l-1加上rtp_header,FU_INDICATOR,FU_HEADER三个包头共14字节
- send( socket1, sendbuf, bytes, 0 );//发送rtp包
- }
- //Sleep(33);
- }
- FreeNALU(n);
- return 0;
- }
将以下文本保存为rtpPara.sdp文件
m=video 1234 RTP/AVP 96
a=rtpmap:96 H264
a=framerate:30
c=IN IP4 192.168.0.25
用VLC打开该文件,然后运行编译好的发送程序。
注意头文件和sdp文件的IP都要与实验机器的IP吻合。
该代码在NALDecoder程序基础上修改了一个内存bug而已。感谢前人的开源。
http://blog.csdn.net/wangjiannuaa/article/details/6694831