| 1 | #include <stdlib.h> |
| 2 | #include <string.h> |
| 3 | #include <assert.h> |
| 4 | |
| 5 | #include "sdp.h" |
| 6 | |
| 7 | struct sdp_s { |
| 8 | char *data; |
| 9 | |
| 10 | /* Actual SDP records */ |
| 11 | const char *version; |
| 12 | const char *origin; |
| 13 | const char *connection; |
| 14 | const char *session; |
| 15 | const char *time; |
| 16 | const char *media; |
| 17 | |
| 18 | /* Additional SDP records */ |
| 19 | const char *rtpmap; |
| 20 | const char *fmtp; |
| 21 | const char *rsaaeskey; |
| 22 | const char *aesiv; |
| 23 | const char *min_latency; |
| 24 | }; |
| 25 | |
| 26 | static void |
| 27 | parse_sdp_line(sdp_t *sdp, char *line) |
| 28 | { |
| 29 | int len = strlen(line); |
| 30 | if (len < 2 || line[1] != '=') { |
| 31 | return; |
| 32 | } |
| 33 | |
| 34 | switch (line[0]) { |
| 35 | case 'v': |
| 36 | sdp->version = &line[2]; |
| 37 | break; |
| 38 | case 'o': |
| 39 | sdp->origin = &line[2]; |
| 40 | break; |
| 41 | case 's': |
| 42 | sdp->session = &line[2]; |
| 43 | break; |
| 44 | case 'c': |
| 45 | sdp->connection = &line[2]; |
| 46 | break; |
| 47 | case 't': |
| 48 | sdp->time = &line[2]; |
| 49 | break; |
| 50 | case 'm': |
| 51 | sdp->media = &line[2]; |
| 52 | break; |
| 53 | case 'a': |
| 54 | { |
| 55 | char *key; |
| 56 | char *value; |
| 57 | |
| 58 | /* Parse key and value */ |
| 59 | key = &line[2]; |
| 60 | value = strstr(line, ":"); |
| 61 | if (!value) break; |
| 62 | *(value++) = '\0'; |
| 63 | |
| 64 | if (!strcmp(key, "rtpmap")) { |
| 65 | sdp->rtpmap = value; |
| 66 | } else if (!strcmp(key, "fmtp")) { |
| 67 | sdp->fmtp = value; |
| 68 | } else if (!strcmp(key, "rsaaeskey")) { |
| 69 | sdp->rsaaeskey = value; |
| 70 | } else if (!strcmp(key, "aesiv")) { |
| 71 | sdp->aesiv = value; |
| 72 | } else if (!strcmp(key, "min-latency")) { |
| 73 | sdp->min_latency = value; |
| 74 | } |
| 75 | break; |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | static void |
| 81 | parse_sdp_data(sdp_t *sdp) |
| 82 | { |
| 83 | int pos, len; |
| 84 | |
| 85 | pos = 0; |
| 86 | len = strlen(sdp->data); |
| 87 | while (pos < len) { |
| 88 | int lfpos; |
| 89 | |
| 90 | /* Find newline in string */ |
| 91 | for (lfpos=pos; sdp->data[lfpos]; lfpos++) { |
| 92 | if (sdp->data[lfpos] == '\n') { |
| 93 | break; |
| 94 | } |
| 95 | } |
| 96 | if (sdp->data[lfpos] != '\n') { |
| 97 | break; |
| 98 | } |
| 99 | |
| 100 | /* Replace newline with '\0' and parse line */ |
| 101 | sdp->data[lfpos] = '\0'; |
| 102 | if (lfpos > pos && sdp->data[lfpos-1] == '\r') { |
| 103 | sdp->data[lfpos-1] = '\0'; |
| 104 | } |
| 105 | parse_sdp_line(sdp, sdp->data+pos); |
| 106 | pos = lfpos+1; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | sdp_t * |
| 111 | sdp_init(const char *sdpdata, int sdpdatalen) |
| 112 | { |
| 113 | sdp_t *sdp; |
| 114 | |
| 115 | sdp = calloc(1, sizeof(sdp_t)); |
| 116 | if (!sdp) { |
| 117 | return NULL; |
| 118 | } |
| 119 | |
| 120 | /* Allocate data buffer */ |
| 121 | sdp->data = malloc(sdpdatalen+1); |
| 122 | if (!sdp->data) { |
| 123 | free(sdp); |
| 124 | return NULL; |
| 125 | } |
| 126 | memcpy(sdp->data, sdpdata, sdpdatalen); |
| 127 | sdp->data[sdpdatalen] = '\0'; |
| 128 | parse_sdp_data(sdp); |
| 129 | return sdp; |
| 130 | } |
| 131 | |
| 132 | void |
| 133 | sdp_destroy(sdp_t *sdp) |
| 134 | { |
| 135 | if (sdp) { |
| 136 | free(sdp->data); |
| 137 | free(sdp); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | const char * |
| 142 | sdp_get_version(sdp_t *sdp) |
| 143 | { |
| 144 | assert(sdp); |
| 145 | |
| 146 | return sdp->version; |
| 147 | } |
| 148 | |
| 149 | const char * |
| 150 | sdp_get_origin(sdp_t *sdp) |
| 151 | { |
| 152 | assert(sdp); |
| 153 | |
| 154 | return sdp->origin; |
| 155 | } |
| 156 | |
| 157 | const char * |
| 158 | sdp_get_session(sdp_t *sdp) |
| 159 | { |
| 160 | assert(sdp); |
| 161 | |
| 162 | return sdp->session; |
| 163 | } |
| 164 | |
| 165 | const char * |
| 166 | sdp_get_connection(sdp_t *sdp) |
| 167 | { |
| 168 | assert(sdp); |
| 169 | |
| 170 | return sdp->connection; |
| 171 | } |
| 172 | |
| 173 | const char * |
| 174 | sdp_get_time(sdp_t *sdp) |
| 175 | { |
| 176 | assert(sdp); |
| 177 | |
| 178 | return sdp->time; |
| 179 | } |
| 180 | |
| 181 | const char * |
| 182 | sdp_get_media(sdp_t *sdp) |
| 183 | { |
| 184 | assert(sdp); |
| 185 | |
| 186 | return sdp->media; |
| 187 | } |
| 188 | |
| 189 | const char * |
| 190 | sdp_get_rtpmap(sdp_t *sdp) |
| 191 | { |
| 192 | assert(sdp); |
| 193 | |
| 194 | return sdp->rtpmap; |
| 195 | } |
| 196 | |
| 197 | const char * |
| 198 | sdp_get_fmtp(sdp_t *sdp) |
| 199 | { |
| 200 | assert(sdp); |
| 201 | |
| 202 | return sdp->fmtp; |
| 203 | } |
| 204 | |
| 205 | const char * |
| 206 | sdp_get_rsaaeskey(sdp_t *sdp) |
| 207 | { |
| 208 | assert(sdp); |
| 209 | |
| 210 | return sdp->rsaaeskey; |
| 211 | } |
| 212 | |
| 213 | const char * |
| 214 | sdp_get_aesiv(sdp_t *sdp) |
| 215 | { |
| 216 | assert(sdp); |
| 217 | |
| 218 | return sdp->aesiv; |
| 219 | } |
| 220 | |
| 221 | const char * |
| 222 | sdp_get_min_latency(sdp_t *sdp) |
| 223 | { |
| 224 | assert(sdp); |
| 225 | |
| 226 | return sdp->min_latency; |
| 227 | } |
| 228 | |