PJ_DEF(pj_status_t) pjmedia_codec_g7221_match_sdp(pj_pool_t *pool,
pjmedia_sdp_media *offer,
unsigned o_fmt_idx,
pjmedia_sdp_media *answer,
unsigned a_fmt_idx,
unsigned option)
{
const pjmedia_sdp_attr *attr_ans;
const pjmedia_sdp_attr *attr_ofr;
pjmedia_sdp_fmtp fmtp;
unsigned a_bitrate, o_bitrate;
const pj_str_t bitrate = {"bitrate=", 8};
pj_status_t status;
PJ_UNUSED_ARG(pool);
PJ_UNUSED_ARG(option);
/* Parse offer */
attr_ofr = pjmedia_sdp_media_find_attr2(offer, "fmtp",
&offer->desc.fmt[o_fmt_idx]);
if (!attr_ofr)
return PJMEDIA_SDP_EINFMTP;
status = pjmedia_sdp_attr_get_fmtp(attr_ofr, &fmtp);
if (status != PJ_SUCCESS)
return status;
GET_FMTP_IVAL(o_bitrate, fmtp, bitrate, 0);
/* Parse answer */
attr_ans = pjmedia_sdp_media_find_attr2(answer, "fmtp",
&answer->desc.fmt[a_fmt_idx]);
if (!attr_ans)
return PJMEDIA_SDP_EINFMTP;
status = pjmedia_sdp_attr_get_fmtp(attr_ans, &fmtp);
if (status != PJ_SUCCESS)
return status;
GET_FMTP_IVAL(a_bitrate, fmtp, bitrate, 0);
/* Compare bitrate in answer and offer. */
if (a_bitrate != o_bitrate)
return PJMEDIA_SDP_EFORMATNOTEQUAL;
return PJ_SUCCESS;
}
/* Matching G722.1 bitrates between offer and answer.
*/
static pj_bool_t match_g7221( const pjmedia_sdp_media *offer,
unsigned o_fmt_idx,
const pjmedia_sdp_media *answer,
unsigned a_fmt_idx)
{
const pjmedia_sdp_attr *attr_ans;
const pjmedia_sdp_attr *attr_ofr;
pjmedia_sdp_fmtp fmtp;
unsigned a_bitrate, o_bitrate;
const pj_str_t bitrate = {"bitrate=", 8};
/* Parse offer */
attr_ofr = pjmedia_sdp_media_find_attr2(offer, "fmtp",
&offer->desc.fmt[o_fmt_idx]);
if (!attr_ofr)
return PJ_FALSE;
if (pjmedia_sdp_attr_get_fmtp(attr_ofr, &fmtp) != PJ_SUCCESS)
return PJ_FALSE;
GET_FMTP_IVAL(o_bitrate, fmtp, bitrate, 0);
/* Parse answer */
attr_ans = pjmedia_sdp_media_find_attr2(answer, "fmtp",
&answer->desc.fmt[a_fmt_idx]);
if (!attr_ans)
return PJ_FALSE;
if (pjmedia_sdp_attr_get_fmtp(attr_ans, &fmtp) != PJ_SUCCESS)
return PJ_FALSE;
GET_FMTP_IVAL(a_bitrate, fmtp, bitrate, 0);
/* Compare bitrate in answer and offer. */
return (a_bitrate == o_bitrate);
}
/* Negotiate AMR format params between offer and answer. Format params
* to be matched are: octet-align, crc, robust-sorting, interleaving,
* and channels (channels is negotiated by rtpmap line negotiation).
* Note: For answerer, octet-align mode setting is adaptable to offerer
* setting. In the case that octet-align mode need to be adjusted,
* pt_need_adapt will be set to the format ID.
*
*/
static pj_bool_t match_amr( const pjmedia_sdp_media *offer,
unsigned o_fmt_idx,
const pjmedia_sdp_media *answer,
unsigned a_fmt_idx,
pj_bool_t answerer,
pj_str_t *pt_need_adapt)
{
/* 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_bool_t match;
/* Parse offerer FMTP */
attr_ofr = pjmedia_sdp_media_find_attr2(offer, "fmtp",
&offer->desc.fmt[o_fmt_idx]);
if (attr_ofr) {
if (pjmedia_sdp_attr_get_fmtp(attr_ofr, &fmtp) != PJ_SUCCESS)
/* Invalid fmtp format. */
return PJ_FALSE;
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) {
if (pjmedia_sdp_attr_get_fmtp(attr_ans, &fmtp) != PJ_SUCCESS)
/* Invalid fmtp format. */
return PJ_FALSE;
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);
}
if (answerer) {
match = a_crc == o_crc &&
a_robust_sorting == o_robust_sorting &&
a_interleaving == o_interleaving;
/* If answerer octet-align setting doesn't match to the offerer's,
* set pt_need_adapt to this media format ID to signal the caller
* that this format ID needs to be adjusted.
*/
if (a_octet_align != o_octet_align && match) {
pj_assert(pt_need_adapt != NULL);
*pt_need_adapt = answer->desc.fmt[a_fmt_idx];
}
} else {
match = (a_octet_align == o_octet_align &&
a_crc == o_crc &&
a_robust_sorting == o_robust_sorting &&
a_interleaving == o_interleaving);
}
return match;
}
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;
}
