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/* $Id$ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* 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-codec/amr_sdp_match.h>
#include <pjmedia/errno.h>
#include <pj/pool.h>
#include <pj/string.h>
#define GET_FMTP_IVAL_BASE(ival, base, fmtp, param, default_val) \
do { \
pj_str_t s; \
char *p; \
p = pj_stristr(&fmtp.fmt_param, ¶m); \
if (!p) { \
ival = default_val; \
break; \
} \
pj_strset(&s, p + param.slen, fmtp.fmt_param.slen - \
(p - fmtp.fmt_param.ptr) - param.slen); \
ival = pj_strtoul2(&s, NULL, base); \
} while (0)
#define GET_FMTP_IVAL(ival, fmtp, param, default_val) \
GET_FMTP_IVAL_BASE(ival, 10, fmtp, param, default_val)
/* Toggle AMR octet-align setting in the fmtp. */
static pj_status_t amr_toggle_octet_align(pj_pool_t *pool,
pjmedia_sdp_media *media,
unsigned fmt_idx)
{
pjmedia_sdp_attr *attr;
pjmedia_sdp_fmtp fmtp;
const pj_str_t STR_OCTET_ALIGN = {"octet-align=", 12};
enum { MAX_FMTP_STR_LEN = 160 };
attr = pjmedia_sdp_media_find_attr2(media, "fmtp",
&media->desc.fmt[fmt_idx]);
/* Check if the AMR media format has FMTP attribute */
if (attr) {
char *p;
pj_status_t status;
status = pjmedia_sdp_attr_get_fmtp(attr, &fmtp);
if (status != PJ_SUCCESS)
return status;
/* Check if the fmtp has octet-align field. */
p = pj_stristr(&fmtp.fmt_param, &STR_OCTET_ALIGN);
if (p) {
/* It has, just toggle the value */
unsigned octet_align;
pj_str_t s;
pj_strset(&s, p + STR_OCTET_ALIGN.slen, fmtp.fmt_param.slen -
(p - fmtp.fmt_param.ptr) - STR_OCTET_ALIGN.slen);
octet_align = pj_strtoul(&s);
*(p + STR_OCTET_ALIGN.slen) = (char)(octet_align? '0' : '1');
} else {
/* It doesn't, append octet-align field */
char buf[MAX_FMTP_STR_LEN];
pj_ansi_snprintf(buf, MAX_FMTP_STR_LEN, "%.*s;octet-align=1",
(int)fmtp.fmt_param.slen, fmtp.fmt_param.ptr);
attr->value = pj_strdup3(pool, buf);
}
} else {
/* Add new attribute for the AMR media format with octet-align
* field set.
*/
char buf[MAX_FMTP_STR_LEN];
attr = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_attr);
attr->name = pj_str("fmtp");
pj_ansi_snprintf(buf, MAX_FMTP_STR_LEN, "%.*s octet-align=1",
(int)media->desc.fmt[fmt_idx].slen,
media->desc.fmt[fmt_idx].ptr);
attr->value = pj_strdup3(pool, buf);
media->attr[media->attr_count++] = attr;
}
return PJ_SUCCESS;
}
PJ_DEF(pj_status_t) pjmedia_codec_amr_match_sdp( pj_pool_t *pool,
pjmedia_sdp_media *offer,
unsigned o_fmt_idx,
pjmedia_sdp_media *answer,
unsigned a_fmt_idx,
unsigned option)
{
/* Negotiated format-param field-names constants. */
const pj_str_t STR_OCTET_ALIGN = {"octet-align=", 12};
const pj_str_t STR_CRC = {"crc=", 4};
const pj_str_t STR_ROBUST_SORTING = {"robust-sorting=", 15};
const pj_str_t STR_INTERLEAVING = {"interleaving=", 13};
/* Negotiated params and their default values. */
unsigned a_octet_align = 0, o_octet_align = 0;
unsigned a_crc = 0, o_crc = 0;
unsigned a_robust_sorting = 0, o_robust_sorting = 0;
unsigned a_interleaving = 0, o_interleaving = 0;
const pjmedia_sdp_attr *attr_ans;
const pjmedia_sdp_attr *attr_ofr;
pjmedia_sdp_fmtp fmtp;
pj_status_t status;
/* Parse offerer FMTP */
attr_ofr = pjmedia_sdp_media_find_attr2(offer, "fmtp",
&offer->desc.fmt[o_fmt_idx]);
if (attr_ofr) {
status = pjmedia_sdp_attr_get_fmtp(attr_ofr, &fmtp);
if (status != PJ_SUCCESS)
return status;
GET_FMTP_IVAL(o_octet_align, fmtp, STR_OCTET_ALIGN, 0);
GET_FMTP_IVAL(o_crc, fmtp, STR_CRC, 0);
GET_FMTP_IVAL(o_robust_sorting, fmtp, STR_ROBUST_SORTING, 0);
GET_FMTP_IVAL(o_interleaving, fmtp, STR_INTERLEAVING, 0);
}
/* Parse answerer FMTP */
attr_ans = pjmedia_sdp_media_find_attr2(answer, "fmtp",
&answer->desc.fmt[a_fmt_idx]);
if (attr_ans) {
status = pjmedia_sdp_attr_get_fmtp(attr_ans, &fmtp);
if (status != PJ_SUCCESS)
return status;
GET_FMTP_IVAL(a_octet_align, fmtp, STR_OCTET_ALIGN, 0);
GET_FMTP_IVAL(a_crc, fmtp, STR_CRC, 0);
GET_FMTP_IVAL(a_robust_sorting, fmtp, STR_ROBUST_SORTING, 0);
GET_FMTP_IVAL(a_interleaving, fmtp, STR_INTERLEAVING, 0);
}
/* First, match crc, robust-sorting, interleaving settings */
if (a_crc != o_crc ||
a_robust_sorting != o_robust_sorting ||
a_interleaving != o_interleaving)
{
return PJMEDIA_SDP_EFORMATNOTEQUAL;
}
/* Match octet-align setting */
if (a_octet_align != o_octet_align) {
/* Check if answer can be modified to match to the offer */
if (option & PJMEDIA_SDP_NEG_FMT_MATCH_ALLOW_MODIFY_ANSWER) {
status = amr_toggle_octet_align(pool, answer, a_fmt_idx);
return status;
} else {
return PJMEDIA_SDP_EFORMATNOTEQUAL;
}
}
return PJ_SUCCESS;
}
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