/* rtcpcycle.c - rtcpcycle */#include <rtcp.h>/*------------------------------------------------------------------------ * rtcpcycle - generate periodic RTCP receiver reports *------------------------------------------------------------------------ */voidrtcpcycle(void){	int		length = RTCP_HEADERLEN + sizeof(ssrc_t) + 				sizeof(struct rblock);	char		buf[length];	struct rtcp     *prtcp = (struct rtcp *) buf;	struct rr       *prr = (struct rr *) prtcp->rtcp_data;	struct rblock   *prb = (struct rblock *) prr->rr_rblock;	int		exthiseq, cumexp, cyclost, cycexp;	struct timeval	now, delay;	double		wait = rtcpinterval(1, 0, PCMMU_BW * RTCP_BWFRAC,			        FALSE, 0, &sn.sn_avgrtcp, TRUE);	while (TRUE) {	    (void) usleep((unsigned int) (wait * 1000000));	    (void) pthread_mutex_lock(&stm.stm_smutex);	    if (stm.stm_packets == stm.stm_recprior) {		    if (++stm.stm_inactive == RTP_INACTTHRESH) {		      rtcpsendbye();		      exit(0);		    }		    (void) pthread_mutex_unlock(&stm.stm_smutex);		    wait = rtcpinterval(2, 0, PCMMU_BW * RTCP_BWFRAC,					FALSE, 0, &sn.sn_avgrtcp, FALSE);		    continue;	    }	    prr->rr_ssrc = htonl(sn.sn_ssrc);	    exthiseq = (stm.stm_roll << 16) | stm.stm_hiseq;	    cumexp = exthiseq - stm.stm_firstseq + 1;	    cycexp = cumexp - stm.stm_expprior;	    cyclost = max(cycexp - (stm.stm_packets -	            stm.stm_recprior), 0);	    prb->rb_ssrc = htonl(stm.stm_ssrc);	    prb->rb_fraclost = cycexp == 0 ? 0 : (cyclost << 8) / cycexp;	    prb->rb_cumlost = hton24(max(min(cumexp - stm.stm_packets,	            0x7fffff), -(1 << 23)));	    prb->rb_hiseq = htonl(exthiseq);	    prb->rb_jitter = htonl((unsigned int) stm.stm_jitter);	    prb->rb_lastsrts = htonl(((stm.stm_ntp[1] & 0x0000ffff) << 16)                    | ((stm.stm_ntp[0] & 0xffff0000) >> 16));	    (void) gettimeofday(&now, NULL);	    timersub(&now, &stm.stm_lastsr, &delay);	    prb->rb_delay = stm.stm_lastsr.tv_sec != 0 ? htonl(                    tv2lin(delay, 65536)) : 0;	    rtcpheader(prtcp, 1, RTCP_RR, length);	    (void) sendto(sn.sn_rtcpfd, prtcp, length, 0, (struct	           sockaddr *) &sn.sn_rtcpto, sizeof(struct sockaddr_in));	    stm.stm_expprior = cumexp;	    stm.stm_recprior = stm.stm_packets;	    (void) pthread_mutex_unlock(&stm.stm_smutex);	    wait = rtcpinterval(2, 1, PCMMU_BW * RTCP_BWFRAC, FALSE,                    length + 28, &sn.sn_avgrtcp, FALSE);	}}