参考源代码目录src/tests/rtpsend.c
ortp_init();
ortp_scheduler_init();
ortp_set_log_level_mask(ORTP_MESSAGE|ORTP_WARNING|ORTP_ERROR);
session=rtp_session_new(RTP_SESSION_SENDONLY);
rtp_session_set_local_addr(session,"192.168.1.16",10000,10001);
rtp_session_set_scheduling_mode(session,1);
rtp_session_set_blocking_mode(session,1);
//rtp_session_set_connected_mode(session,TRUE);
rtp_session_set_connected_mode(session,0);
rtp_session_set_remote_addr(session,argv[2],atoi(argv[3]));
rtp_session_set_payload_type(session,8);
ssrc=getenv("SSRC");
if (ssrc!=NULL) {
printf("using SSRC=%i.
",atoi(ssrc));
rtp_session_set_ssrc(session,atoi(ssrc));
}
rtp_session_set_ssrc(session,0);
infile=fopen(argv[1],"r");
if (infile==NULL) {
perror("Cannot open file");
return -1;
}
signal(SIGINT,stophandler);
while( ((i=fread(buffer,1,160,infile))>0) && (runcond) )
{
rtp_session_send_with_ts(session,buffer,i,user_ts);
user_ts+=160;
if (clockslide!=0 && user_ts%(160*50)==0){
ortp_message("Clock sliding of %i miliseconds now",clockslide);
rtp_session_make_time_distorsion(session,clockslide);
}
/*this will simulate a burst of late packets */
if (jitter && (user_ts%(8000)==0)) {
struct timespec pausetime, remtime;
ortp_message("Simulating late packets now (%i milliseconds)",jitter);
pausetime.tv_sec=jitter/1000;
pausetime.tv_nsec=(jitter%1000)*1000000;
while(nanosleep(&pausetime,&remtime)==-1 && errno==EINTR){
pausetime=remtime;
}
}
}
fclose(infile);
rtp_session_destroy(session);
ortp_exit();
ortp_global_stats_display();
代码解读:
1、如果不手动调用rtp_session_set_local_addr设置本地RTP IP/PORT和RTCP PORT,ortp会自动选择可用端口;
2、rtp_session_set_connected_mode设置连接模式,如果为1,会根据RTCP判断是否连接上;
3、上述代码是发送PCM A/U律代码,rtp_session_set_payload_type设置编码格式;
4、支持多线程;