#include <u.h>#include <libc.h>#include <ip.h>#include "dat.h"#include "protos.h" typedef struct Hdr Hdr;struct Hdr {	uchar	hdr;		/* RTCP header */	uchar	pt;		/* Packet type */	uchar	len[2];		/* Report length */	uchar	ssrc[4];	/* Synchronization source identifier */	uchar	ntp[8];		/* NTP time stamp */	uchar	rtp[4];		/* RTP time stamp */	uchar	pktc[4];	/* Sender's packet count */	uchar	octc[4];	/* Sender's octet count */}; typedef struct Report Report;struct Report {	uchar	ssrc[4];	/* SSRC identifier */	uchar	lost[4];	/* Fraction + cumu lost */	uchar	seqhi[4];	/* Highest seq number received */	uchar	jitter[4];	/* Interarrival jitter */	uchar	lsr[4];		/* Last SR */	uchar	dlsr[4];	/* Delay since last SR */}; enum{	RTCPLEN = 28,		/* Minimum size of an RTCP header */	REPORTLEN = 24,}; static intp_seprint(Msg *m){	int rc, i, frac;	float dlsr;	Hdr*h;	Report*r; 	if(m->pe - m->ps < RTCPLEN)		return -1; 	h = (Hdr*)m->ps;	if(m->pe - m->ps < (NetS(h->len) + 1) * 4)		return -1; 	rc = h->hdr & 0x1f;	m->ps += RTCPLEN;	m->p = seprint(m->p, m->e, "version=%d rc=%d tp=%d ssrc=%8ux "		"ntp=%d.%.10ud rtp=%d pktc=%d octc=%d hlen=%d",		(h->hdr >> 6) & 3, rc, h->pt, NetL(h->ssrc), NetL(h->ntp),		(uint)NetL(&h->ntp[4]), NetL(h->rtp), NetL(h->pktc),		NetL(h->octc), (NetS(h->len) + 1) * 4); 	for(i = 0; i < rc; i++){		r = (Report*)m->ps;		m->ps += REPORTLEN; 		frac = (int)((r->lost[0] * 100.) / 256.);		r->lost[0] = 0;		dlsr = NetL(r->dlsr) / 65536.; 		m->p = seprint(m->p, m->e, "\n\trr(csrc=%8ux frac=%3d%% "			"cumu=%10d seqhi=%10ud jitter=%10d lsr=%8ux dlsr=%f)",			NetL(r->ssrc), frac, NetL(r->lost), NetL(r->seqhi),			NetL(r->jitter), NetL(r->lsr), dlsr);	}	m->pr = nil;	return 0;} Proto rtcp = {	"rtcp",	nil,	nil,	p_seprint,	nil,	nil,	nil,	defaultframer,};