| 1 | /** |
| 2 | * Copyright (C) 2011-2012 Juho Vähä-Herttua |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | */ |
| 14 | |
| 15 | #include <stdlib.h> |
| 16 | #include <string.h> |
| 17 | #include <assert.h> |
| 18 | |
| 19 | #include "sdp.h" |
| 20 | |
| 21 | struct sdp_s { |
| 22 | char *data; |
| 23 | |
| 24 | /* Actual SDP records */ |
| 25 | const char *version; |
| 26 | const char *origin; |
| 27 | const char *connection; |
| 28 | const char *session; |
| 29 | const char *time; |
| 30 | const char *media; |
| 31 | |
| 32 | /* Additional SDP records */ |
| 33 | const char *rtpmap; |
| 34 | const char *fmtp; |
| 35 | const char *rsaaeskey; |
| 36 | const char *aesiv; |
| 37 | const char *min_latency; |
| 38 | }; |
| 39 | |
| 40 | static void |
| 41 | parse_sdp_line(sdp_t *sdp, char *line) |
| 42 | { |
| 43 | int len = strlen(line); |
| 44 | if (len < 2 || line[1] != '=') { |
| 45 | return; |
| 46 | } |
| 47 | |
| 48 | switch (line[0]) { |
| 49 | case 'v': |
| 50 | sdp->version = &line[2]; |
| 51 | break; |
| 52 | case 'o': |
| 53 | sdp->origin = &line[2]; |
| 54 | break; |
| 55 | case 's': |
| 56 | sdp->session = &line[2]; |
| 57 | break; |
| 58 | case 'c': |
| 59 | sdp->connection = &line[2]; |
| 60 | break; |
| 61 | case 't': |
| 62 | sdp->time = &line[2]; |
| 63 | break; |
| 64 | case 'm': |
| 65 | sdp->media = &line[2]; |
| 66 | break; |
| 67 | case 'a': |
| 68 | { |
| 69 | char *key; |
| 70 | char *value; |
| 71 | |
| 72 | /* Parse key and value */ |
| 73 | key = &line[2]; |
| 74 | value = strstr(line, ":"); |
| 75 | if (!value) break; |
| 76 | *(value++) = '\0'; |
| 77 | |
| 78 | if (!strcmp(key, "rtpmap")) { |
| 79 | sdp->rtpmap = value; |
| 80 | } else if (!strcmp(key, "fmtp")) { |
| 81 | sdp->fmtp = value; |
| 82 | } else if (!strcmp(key, "rsaaeskey")) { |
| 83 | sdp->rsaaeskey = value; |
| 84 | } else if (!strcmp(key, "aesiv")) { |
| 85 | sdp->aesiv = value; |
| 86 | } else if (!strcmp(key, "min-latency")) { |
| 87 | sdp->min_latency = value; |
| 88 | } |
| 89 | break; |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | static void |
| 95 | parse_sdp_data(sdp_t *sdp) |
| 96 | { |
| 97 | int pos, len; |
| 98 | |
| 99 | pos = 0; |
| 100 | len = strlen(sdp->data); |
| 101 | while (pos < len) { |
| 102 | int lfpos; |
| 103 | |
| 104 | /* Find newline in string */ |
| 105 | for (lfpos=pos; sdp->data[lfpos]; lfpos++) { |
| 106 | if (sdp->data[lfpos] == '\n') { |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | if (sdp->data[lfpos] != '\n') { |
| 111 | break; |
| 112 | } |
| 113 | |
| 114 | /* Replace newline with '\0' and parse line */ |
| 115 | sdp->data[lfpos] = '\0'; |
| 116 | if (lfpos > pos && sdp->data[lfpos-1] == '\r') { |
| 117 | sdp->data[lfpos-1] = '\0'; |
| 118 | } |
| 119 | parse_sdp_line(sdp, sdp->data+pos); |
| 120 | pos = lfpos+1; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | sdp_t * |
| 125 | sdp_init(const char *sdpdata, int sdpdatalen) |
| 126 | { |
| 127 | sdp_t *sdp; |
| 128 | |
| 129 | sdp = calloc(1, sizeof(sdp_t)); |
| 130 | if (!sdp) { |
| 131 | return NULL; |
| 132 | } |
| 133 | |
| 134 | /* Allocate data buffer */ |
| 135 | sdp->data = malloc(sdpdatalen+1); |
| 136 | if (!sdp->data) { |
| 137 | free(sdp); |
| 138 | return NULL; |
| 139 | } |
| 140 | memcpy(sdp->data, sdpdata, sdpdatalen); |
| 141 | sdp->data[sdpdatalen] = '\0'; |
| 142 | parse_sdp_data(sdp); |
| 143 | return sdp; |
| 144 | } |
| 145 | |
| 146 | void |
| 147 | sdp_destroy(sdp_t *sdp) |
| 148 | { |
| 149 | if (sdp) { |
| 150 | free(sdp->data); |
| 151 | free(sdp); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | const char * |
| 156 | sdp_get_version(sdp_t *sdp) |
| 157 | { |
| 158 | assert(sdp); |
| 159 | |
| 160 | return sdp->version; |
| 161 | } |
| 162 | |
| 163 | const char * |
| 164 | sdp_get_origin(sdp_t *sdp) |
| 165 | { |
| 166 | assert(sdp); |
| 167 | |
| 168 | return sdp->origin; |
| 169 | } |
| 170 | |
| 171 | const char * |
| 172 | sdp_get_session(sdp_t *sdp) |
| 173 | { |
| 174 | assert(sdp); |
| 175 | |
| 176 | return sdp->session; |
| 177 | } |
| 178 | |
| 179 | const char * |
| 180 | sdp_get_connection(sdp_t *sdp) |
| 181 | { |
| 182 | assert(sdp); |
| 183 | |
| 184 | return sdp->connection; |
| 185 | } |
| 186 | |
| 187 | const char * |
| 188 | sdp_get_time(sdp_t *sdp) |
| 189 | { |
| 190 | assert(sdp); |
| 191 | |
| 192 | return sdp->time; |
| 193 | } |
| 194 | |
| 195 | const char * |
| 196 | sdp_get_media(sdp_t *sdp) |
| 197 | { |
| 198 | assert(sdp); |
| 199 | |
| 200 | return sdp->media; |
| 201 | } |
| 202 | |
| 203 | const char * |
| 204 | sdp_get_rtpmap(sdp_t *sdp) |
| 205 | { |
| 206 | assert(sdp); |
| 207 | |
| 208 | return sdp->rtpmap; |
| 209 | } |
| 210 | |
| 211 | const char * |
| 212 | sdp_get_fmtp(sdp_t *sdp) |
| 213 | { |
| 214 | assert(sdp); |
| 215 | |
| 216 | return sdp->fmtp; |
| 217 | } |
| 218 | |
| 219 | const char * |
| 220 | sdp_get_rsaaeskey(sdp_t *sdp) |
| 221 | { |
| 222 | assert(sdp); |
| 223 | |
| 224 | return sdp->rsaaeskey; |
| 225 | } |
| 226 | |
| 227 | const char * |
| 228 | sdp_get_aesiv(sdp_t *sdp) |
| 229 | { |
| 230 | assert(sdp); |
| 231 | |
| 232 | return sdp->aesiv; |
| 233 | } |
| 234 | |
| 235 | const char * |
| 236 | sdp_get_min_latency(sdp_t *sdp) |
| 237 | { |
| 238 | assert(sdp); |
| 239 | |
| 240 | return sdp->min_latency; |
| 241 | } |
| 242 | |