diff options
Diffstat (limited to 'pjmedia/src/pjmedia-codec/amr_sdp_match.c')
| -rw-r--r-- | pjmedia/src/pjmedia-codec/amr_sdp_match.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/pjmedia/src/pjmedia-codec/amr_sdp_match.c b/pjmedia/src/pjmedia-codec/amr_sdp_match.c new file mode 100644 index 00000000..5eb02185 --- /dev/null +++ b/pjmedia/src/pjmedia-codec/amr_sdp_match.c @@ -0,0 +1,176 @@ +/* $Id$ */ +/* + * 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; +} |