| /* $Id$ */ |
| /* |
| * 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; |
| } |