Function parse_sdp_session

parser/sdp/sdp.c:408–677

* SDP parser method. */

 * SDP parser method.
 */
int parse_sdp_session(str *sdp_body, int session_num, str *cnt_disp, sdp_info_t* _sdp)
{
	str body = *sdp_body;
	str sdp_ip = {NULL,0};
	str sdp_media, sdp_port, sdp_transport, sdp_payload;
	str payload;
	str rtp_payload, rtp_enc, rtp_clock, rtp_params;
	int is_rtp;
	char *bodylimit;
	char *v1p, *o1p, *m1p, *m2p, *c1p, *c2p, *a1p, *a2p, *b1p;
	str tmpstr1,custom_attr;
	int stream_num, payloadnum, pf;
	sdp_session_cell_t *session;
	sdp_stream_cell_t *stream;
	sdp_payload_attr_t *payload_attr;
	int parse_payload_attr;
	str fmtp_string;

	/*
	 * Parsing of SDP body.
	 * Each session starts with v-line and each session may contain a few
	 * media descriptions (each starts with m-line).
	 * We have to change ports in m-lines, and also change IP addresses in
	 * c-lines which can be placed either in session header (fallback for
	 * all medias) or media description.
	 * Ports should be allocated for any media. IPs all should be changed
	 * to the same value (RTP proxy IP), so we can change all c-lines
	 * unconditionally.
	 */
	bodylimit = body.s + body.len;
	if (body.len < 2) {
		LM_ERR("body too short!\n");
		return -1;
	}
	v1p = body.s;
	/* skip over the first initial \r\n  (optional) */
	if (*v1p == '\r' || *v1p == '\n')
		v1p++;
	if (*v1p == '\r' || *v1p == '\n')
		v1p++;
	if (v1p + 1 >= bodylimit) {
		LM_ERR("body too short %ld!\n", (long)(bodylimit - v1p));
		return -1;
	}
	if (*v1p != 'v' || *(v1p+1) != '=') {
		LM_ERR("invalid SDP start: [%c%c]\n", *v1p, *(v1p + 1));
		return -1;
	}
	/* get session origin */
	o1p = find_sdp_line(v1p, bodylimit, 'o');
	if (o1p == NULL) {
		LM_ERR("no o= in session\n");
		return -1;
	}
	/* Have this session media description? */
	m1p = find_sdp_line(o1p, bodylimit, 'm');
	if (m1p == NULL) {
		LM_ERR("no m= in session\n");