| Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #include <pjmedia/stream_common.h> |
| 20 | #include <pj/log.h> |
| 21 | |
| 22 | #define THIS_FILE "stream_common.c" |
| 23 | |
| 24 | /* |
| 25 | * Parse fmtp for specified format/payload type. |
| 26 | */ |
| 27 | PJ_DEF(pj_status_t) pjmedia_stream_info_parse_fmtp( pj_pool_t *pool, |
| 28 | const pjmedia_sdp_media *m, |
| 29 | unsigned pt, |
| 30 | pjmedia_codec_fmtp *fmtp) |
| 31 | { |
| 32 | const pjmedia_sdp_attr *attr; |
| 33 | pjmedia_sdp_fmtp sdp_fmtp; |
| 34 | char *p, *p_end, fmt_buf[8]; |
| 35 | pj_str_t fmt; |
| 36 | pj_status_t status; |
| 37 | |
| 38 | pj_assert(m && fmtp); |
| 39 | |
| 40 | pj_bzero(fmtp, sizeof(pjmedia_codec_fmtp)); |
| 41 | |
| 42 | /* Get "fmtp" attribute for the format */ |
| 43 | pj_ansi_sprintf(fmt_buf, "%d", pt); |
| 44 | fmt = pj_str(fmt_buf); |
| 45 | attr = pjmedia_sdp_media_find_attr2(m, "fmtp", &fmt); |
| 46 | if (attr == NULL) |
| 47 | return PJ_SUCCESS; |
| 48 | |
| 49 | /* Parse "fmtp" attribute */ |
| 50 | status = pjmedia_sdp_attr_get_fmtp(attr, &sdp_fmtp); |
| 51 | if (status != PJ_SUCCESS) |
| 52 | return status; |
| 53 | |
| 54 | /* Prepare parsing */ |
| 55 | p = sdp_fmtp.fmt_param.ptr; |
| 56 | p_end = p + sdp_fmtp.fmt_param.slen; |
| 57 | |
| 58 | /* Parse */ |
| 59 | while (p < p_end) { |
| 60 | char *token, *start, *end; |
| 61 | |
| 62 | if (fmtp->cnt >= PJMEDIA_CODEC_MAX_FMTP_CNT) { |
| 63 | PJ_LOG(4,(THIS_FILE, |
| 64 | "Warning: fmtp parameter count exceeds " |
| 65 | "PJMEDIA_CODEC_MAX_FMTP_CNT")); |
| 66 | return PJ_SUCCESS; |
| 67 | } |
| 68 | |
| 69 | /* Skip whitespaces */ |
| 70 | while (p < p_end && (*p == ' ' || *p == '\t')) ++p; |
| 71 | if (p == p_end) |
| 72 | break; |
| 73 | |
| 74 | /* Get token */ |
| 75 | start = p; |
| 76 | while (p < p_end && *p != ';' && *p != '=') ++p; |
| 77 | end = p - 1; |
| 78 | |
| 79 | /* Right trim */ |
| 80 | while (end >= start && (*end == ' ' || *end == '\t' || |
| 81 | *end == '\r' || *end == '\n' )) |
| 82 | --end; |
| 83 | |
| 84 | /* Forward a char after trimming */ |
| 85 | ++end; |
| 86 | |
| 87 | /* Store token */ |
| 88 | if (end > start) { |
| 89 | if (pool) { |
| 90 | token = (char*)pj_pool_alloc(pool, end - start); |
| 91 | pj_ansi_strncpy(token, start, end - start); |
| 92 | } else { |
| 93 | token = start; |
| 94 | } |
| 95 | if (*p == '=') |
| 96 | /* Got param name */ |
| 97 | pj_strset(&fmtp->param[fmtp->cnt].name, token, end - start); |
| 98 | else |
| 99 | /* Got param value */ |
| 100 | pj_strset(&fmtp->param[fmtp->cnt++].val, token, end - start); |
| 101 | } else if (*p != '=') { |
| 102 | ++fmtp->cnt; |
| 103 | } |
| 104 | |
| 105 | /* Next */ |
| 106 | ++p; |
| 107 | } |
| 108 | |
| 109 | return PJ_SUCCESS; |
| 110 | } |
| 111 | |