int DecomposeRTPpacket (RTPpacket_t *p)
{
// consistency check
assert (p->packlen < 65536 - 28); // IP, UDP headers
assert (p->packlen >= 12); // at least a complete RTP header
assert (p->payload != NULL);
assert (p->packet != NULL);
// Extract header information
p->v = (p->packet[0] >> 6) & 0x03;
p->p = (p->packet[0] >> 5) & 0x01;
p->x = (p->packet[0] >> 4) & 0x01;
p->cc = (p->packet[0] >> 0) & 0x0F;
p->m = (p->packet[1] >> 7) & 0x01;
p->pt = (p->packet[1] >> 0) & 0x7F;
memcpy (&p->seq, &p->packet[2], 2);
p->seq = ntohs((unsigned short)p->seq);
memcpy (&p->timestamp, &p->packet[4], 4);// change to shifts for unified byte sex
p->timestamp = ntohl(p->timestamp);
memcpy (&p->ssrc, &p->packet[8], 4);// change to shifts for unified byte sex
p->ssrc = ntohl(p->ssrc);
// header consistency checks
if ( (p->v != 2)
|| (p->p != 0)
|| (p->x != 0)
|| (p->cc != 0) )
{
printf ("DecomposeRTPpacket, RTP header consistency problem, header follows\n");
DumpRTPHeader (p);
return -1;
}
p->paylen = p->packlen-12;
memcpy (p->payload, &p->packet[12], p->paylen);
return 0;
}
int DecomposeRTPpacket (RTPpacket_t *p)
{
// consistency check
assert (p->packlen < 65536 - 28); // IP, UDP headers
assert (p->packlen >= 12); // at least a complete RTP header
assert (p->payload != NULL);
assert (p->packet != NULL);
// Extract header information
p->v = p->packet[0] & 0x3;
p->p = (p->packet[0] & 0x4) >> 2;
p->x = (p->packet[0] & 0x8) >> 3;
p->cc = (p->packet[0] & 0xf0) >> 4;
p->m = p->packet[1] & 0x1;
p->pt = (p->packet[1] & 0xfe) >> 1;
p->seq = p->packet[2] | (p->packet[3] << 8);
memcpy (&p->timestamp, &p->packet[4], 4);// change to shifts for unified byte sex
memcpy (&p->ssrc, &p->packet[8], 4);// change to shifts for unified byte sex
// header consistency checks
if ( (p->v != 2)
|| (p->p != 0)
|| (p->x != 0)
|| (p->cc != 0) )
{
printf ("DecomposeRTPpacket, RTP header consistency problem, header follows\n");
DumpRTPHeader (p);
return -1;
}
p->paylen = p->packlen-12;
memcpy (p->payload, &p->packet[12], p->paylen);
return 0;
}
