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/* $Id: stream_common.c 3664 2011-07-19 03:42:28Z nanang $ */
/*
* Copyright (C) 2011 Teluu Inc. (http://www.teluu.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjmedia/stream_common.h>
#include <pj/log.h>
#define THIS_FILE "stream_common.c"
/*
* Parse fmtp for specified format/payload type.
*/
PJ_DEF(pj_status_t) pjmedia_stream_info_parse_fmtp( pj_pool_t *pool,
const pjmedia_sdp_media *m,
unsigned pt,
pjmedia_codec_fmtp *fmtp)
{
const pjmedia_sdp_attr *attr;
pjmedia_sdp_fmtp sdp_fmtp;
char *p, *p_end, fmt_buf[8];
pj_str_t fmt;
pj_status_t status;
pj_assert(m && fmtp);
pj_bzero(fmtp, sizeof(pjmedia_codec_fmtp));
/* Get "fmtp" attribute for the format */
pj_ansi_sprintf(fmt_buf, "%d", pt);
fmt = pj_str(fmt_buf);
attr = pjmedia_sdp_media_find_attr2(m, "fmtp", &fmt);
if (attr == NULL)
return PJ_SUCCESS;
/* Parse "fmtp" attribute */
status = pjmedia_sdp_attr_get_fmtp(attr, &sdp_fmtp);
if (status != PJ_SUCCESS)
return status;
/* Prepare parsing */
p = sdp_fmtp.fmt_param.ptr;
p_end = p + sdp_fmtp.fmt_param.slen;
/* Parse */
while (p < p_end) {
char *token, *start, *end;
if (fmtp->cnt >= PJMEDIA_CODEC_MAX_FMTP_CNT) {
PJ_LOG(4,(THIS_FILE,
"Warning: fmtp parameter count exceeds "
"PJMEDIA_CODEC_MAX_FMTP_CNT"));
return PJ_SUCCESS;
}
/* Skip whitespaces */
while (p < p_end && (*p == ' ' || *p == '\t')) ++p;
if (p == p_end)
break;
/* Get token */
start = p;
while (p < p_end && *p != ';' && *p != '=') ++p;
end = p - 1;
/* Right trim */
while (end >= start && (*end == ' ' || *end == '\t' ||
*end == '\r' || *end == '\n' ))
--end;
/* Forward a char after trimming */
++end;
/* Store token */
if (end > start) {
if (pool) {
token = (char*)pj_pool_alloc(pool, end - start);
pj_ansi_strncpy(token, start, end - start);
} else {
token = start;
}
if (*p == '=')
/* Got param name */
pj_strset(&fmtp->param[fmtp->cnt].name, token, end - start);
else
/* Got param value */
pj_strset(&fmtp->param[fmtp->cnt++].val, token, end - start);
} else if (*p != '=') {
++fmtp->cnt;
}
/* Next */
++p;
}
return PJ_SUCCESS;
}
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