【音视频】RTP封装G711源代码
G711:8000HZ,8位,20ms一包数据 ,50包每秒
源代码:
// g711.c // #include <stdio.h> #include <stdlib.h> #include <string.h> #include <memory.h> #include <netdb.h> #include <time.h> #include <sys/types.h> #include <netinet/in.h> #include <sys/socket.h> #include <arpa/inet.h> #include <unistd.h> //close() #define DEST_PORT 8888 #define DEST_IP "192.168.1.18" typedef struct { unsigned char csrc_len:4; unsigned char extension:1; unsigned char padding:1; unsigned char version:2; unsigned char payload:7; unsigned char marker:1; unsigned short seq_no; unsigned long timestamp; unsigned long ssrc; } RTP_FIXED_HEADER; int main(int argc, char* argv[]) { FILE *file_g711 = NULL; int ret; int M_bit; M_bit = 1; char sendbuf[1500]; memset(sendbuf,0,1500); unsigned short seq_num = 0; RTP_FIXED_HEADER *rtp_hdr; int socket1; struct sockaddr_in server; int len = sizeof(server); float framerate = 25; unsigned int timestamp_increse = 0,ts_current = 0; timestamp_increse = 160; 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, (struct sockaddr *)&server, len) ;//申请UDP套接字 file_g711 = fopen("test.g711","rb"); if(file_g711 == NULL) { printf("fopen error!\n"); } printf("g711 open successfully!\n"); while((ret = fread(&sendbuf[12],sizeof(char),160,file_g711)) > 0) { rtp_hdr =(RTP_FIXED_HEADER*)&sendbuf[0]; //设置RTP HEADER, rtp_hdr->payload = 0; //负载类型号, rtp_hdr->version = 2; //版本号,此版本固定为2 if(1 == M_bit) { rtp_hdr->marker = 1; //标志位,由具体协议规定其值。 M_bit = 0; printf("M_bit = 1\n"); } else { rtp_hdr->marker = 0; //标志位,由具体协议规定其值。 } rtp_hdr->ssrc = htonl(10); //随机指定为10,并且在本RTP会话中全局唯一 rtp_hdr->seq_no = htons(seq_num ++); printf("\n\n%x\n\n",sendbuf[1]); ts_current = ts_current+timestamp_increse; rtp_hdr->timestamp=htonl(ts_current); printf("calloc\n"); //free(Buf); printf("read data size is %d\n",ret); printf("sizeof(sendbuf) = %d",sizeof(sendbuf)); ret = send( socket1, sendbuf, ret+12, 0 );//发送rtp包 printf("\n\n%d\n\n",ret); if(ret<0) { perror("send"); break; } printf("**********************************\n"); printf("ret = %d\n",ret); printf("rtp_hdr->payload = %x\n",rtp_hdr->payload); printf("rtp_hdr->version = %x\n",rtp_hdr->version); printf("rtp_hdr->marker = %x\n",rtp_hdr->marker); printf("rtp_hdr->ssrc = %x\n",rtp_hdr->ssrc); printf("rtp_hdr->seq_no = %x\n",rtp_hdr->seq_no); printf("rtp_hdr->timestamp = %x\n",rtp_hdr->timestamp); printf("sendbuf[0]= %x\n",sendbuf[0]); printf("sendbuf[12]= %x\n",sendbuf[12]); printf("**********************************\n"); usleep(19000); memset(sendbuf,0,1500); } fclose(file_g711); printf("end !!!!!!!!!!!!!!!!!!\n"); return 0; }
sdp文件:
m=audio 8888 RTP/AVP 0
a=rtpmap:8 pcmu/8000/1
a=ptime:20
c=IN IP4 192.168.1.18