ortp 라이브러리 이용방법 질문좀 드릴게요~~

// rtpsend.c
 
#include <ortp/ortp.h>
#include <signal.h>
#include <stdlib.h>
 
#ifndef _WIN32 
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#endif
 
int runcond=1;
 
void stophandler(int signum)
{
	runcond=0;
}
 
static const char *help="usage: rtpsend	filename dest_ip4addr dest_port [ --with-clockslide <value> ] [ --with-jitter <milliseconds>]\n";
 
int main(int argc, char *argv[])
{
	RtpSession *session;
	unsigned char buffer[160];
	int i;
	FILE *infile;
	char *ssrc;
	uint32_t user_ts=0;
	int clockslide=0;
	int jitter=0;
	if (argc<4){
		printf("%s", help);
		return -1;
	}
	for(i=4;i<argc;i++){
		if (strcmp(argv[i],"--with-clockslide")==0){
			i++;
			if (i>=argc) {
				printf("%s", help);
				return -1;
			}
			clockslide=atoi(argv[i]);
			ortp_message("Using clockslide of %i milisecond every 50 packets.",clockslide);
		}else if (strcmp(argv[i],"--with-jitter")==0){
			ortp_message("Jitter will be added to outgoing stream.");
			i++;
			if (i>=argc) {
				printf("%s", help);
				return -1;
			}
			jitter=atoi(argv[i]);
		}
	}
 
	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_scheduling_mode(session,1);
	rtp_session_set_blocking_mode(session,1);
	rtp_session_set_connected_mode(session,TRUE);
	rtp_session_set_remote_addr(session,argv[2],atoi(argv[3]));
	rtp_session_set_payload_type(session,0);
 
	ssrc=getenv("SSRC");
	if (ssrc!=NULL) {
		printf("using SSRC=%i.\n",atoi(ssrc));
		rtp_session_set_ssrc(session,atoi(ssrc));
	}
 
	#ifndef _WIN32
	infile=fopen(argv[1],"r");
	#else
	infile=fopen(argv[1],"rb");
	#endif
 
	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();
 
	return 0;
}

void InputTest::initializeAudio()
{
    m_pullMode = true;
 
    m_format.setFrequency(8000);
    m_format.setChannels(1);
    m_format.setSampleSize(16);
    m_format.setSampleType(QAudioFormat::SignedInt);
    m_format.setByteOrder(QAudioFormat::LittleEndian);
    m_format.setCodec("audio/pcm");
 
    QAudioDeviceInfo info(QAudioDeviceInfo::defaultInputDevice());
    if (!info.isFormatSupported(m_format)) {
        qWarning() << "Default format not supported - trying to use nearest";
        m_format = info.nearestFormat(m_format);
    }
 
    m_audioInfo  = new AudioInfo(m_format, this);
    connect(m_audioInfo, SIGNAL(update()), SLOT(refreshDisplay()));
 
    createAudioInput();
}
 
void InputTest::createAudioInput()
{
    m_audioInput = new QAudioInput(m_device, m_format, this);
    m_audioInput->start();
}