ref: 0b9c6fa117c3fe571aed497579b3340b2f8a1164
dir: /sys/src/cmd/ip/snoopy/rtp.c/
#include <u.h> #include <libc.h> #include <ip.h> #include "dat.h" #include "protos.h" typedef struct Hdr Hdr; struct Hdr { uchar hdr; /* RTP header */ uchar marker; /* Payload and marker */ uchar seq[2]; /* Sequence number */ uchar ts[4]; /* Time stamp */ uchar ssrc[4]; /* Synchronization source identifier */ }; enum{ RTPLEN = 12, /* Minimum size of an RTP header */ }; static int p_seprint(Msg *m) { int cc, i; ushort seq; ulong ssrc, ts; Hdr*h; if(m->pe - m->ps < RTPLEN) return -1; h = (Hdr*)m->ps; cc = h->hdr & 0xf; if(m->pe - m->ps < RTPLEN + cc * 4) return -1; m->ps += RTPLEN; seq = NetS(h->seq); ts = NetL(h->ts); ssrc = NetL(h->ssrc); m->p = seprint(m->p, m->e, "version=%d x=%d cc=%d seq=%d ts=%ld ssrc=%ulx", (h->hdr >> 6) & 3, (h->hdr >> 4) & 1, cc, seq, ts, ssrc); for(i = 0; i < cc; i++){ m->p = seprint(m->p, m->e, " csrc[%d]=%d", i, NetL(m->ps)); m->ps += 4; } m->pr = nil; return 0; } Proto rtp = { "rtp", nil, nil, p_seprint, nil, nil, nil, defaultframer, };