James Kuszmaul | 82f6c04 | 2021-01-17 11:30:16 -0800 | [diff] [blame^] | 1 | /** |
| 2 | * @file sdp/media.c SDP Media |
| 3 | * |
| 4 | * Copyright (C) 2010 Creytiv.com |
| 5 | */ |
| 6 | #include <stdlib.h> |
| 7 | #include <string.h> |
| 8 | #include <re_types.h> |
| 9 | #include <re_fmt.h> |
| 10 | #include <re_mem.h> |
| 11 | #include <re_mbuf.h> |
| 12 | #include <re_list.h> |
| 13 | #include <re_sa.h> |
| 14 | #include <re_sdp.h> |
| 15 | #include "sdp.h" |
| 16 | |
| 17 | |
| 18 | static void destructor(void *arg) |
| 19 | { |
| 20 | struct sdp_media *m = arg; |
| 21 | unsigned i; |
| 22 | |
| 23 | list_flush(&m->lfmtl); |
| 24 | list_flush(&m->rfmtl); |
| 25 | list_flush(&m->rattrl); |
| 26 | list_flush(&m->lattrl); |
| 27 | |
| 28 | if (m->le.list) { |
| 29 | m->disabled = true; |
| 30 | m->ench = NULL; |
| 31 | mem_ref(m); |
| 32 | return; |
| 33 | } |
| 34 | |
| 35 | for (i=0; i<ARRAY_SIZE(m->protov); i++) |
| 36 | mem_deref(m->protov[i]); |
| 37 | |
| 38 | list_unlink(&m->le); |
| 39 | mem_deref(m->name); |
| 40 | mem_deref(m->proto); |
| 41 | mem_deref(m->uproto); |
| 42 | } |
| 43 | |
| 44 | |
| 45 | static int media_alloc(struct sdp_media **mp, struct list *list) |
| 46 | { |
| 47 | struct sdp_media *m; |
| 48 | int i; |
| 49 | |
| 50 | m = mem_zalloc(sizeof(*m), destructor); |
| 51 | if (!m) |
| 52 | return ENOMEM; |
| 53 | |
| 54 | list_append(list, &m->le, m); |
| 55 | |
| 56 | m->ldir = SDP_SENDRECV; |
| 57 | m->rdir = SDP_SENDRECV; |
| 58 | m->dynpt = RTP_DYNPT_START; |
| 59 | |
| 60 | sa_init(&m->laddr, AF_INET); |
| 61 | sa_init(&m->raddr, AF_INET); |
| 62 | sa_init(&m->laddr_rtcp, AF_INET); |
| 63 | sa_init(&m->raddr_rtcp, AF_INET); |
| 64 | |
| 65 | for (i=0; i<SDP_BANDWIDTH_MAX; i++) { |
| 66 | m->lbwv[i] = -1; |
| 67 | m->rbwv[i] = -1; |
| 68 | } |
| 69 | |
| 70 | *mp = m; |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | |
| 76 | /** |
| 77 | * Add a media line to an SDP Session |
| 78 | * |
| 79 | * @param mp Pointer to allocated SDP Media line object |
| 80 | * @param sess SDP Session |
| 81 | * @param name Media name |
| 82 | * @param port Port number |
| 83 | * @param proto Transport protocol |
| 84 | * |
| 85 | * @return 0 if success, otherwise errorcode |
| 86 | */ |
| 87 | int sdp_media_add(struct sdp_media **mp, struct sdp_session *sess, |
| 88 | const char *name, uint16_t port, const char *proto) |
| 89 | { |
| 90 | struct sdp_media *m; |
| 91 | int err; |
| 92 | |
| 93 | if (!sess || !name || !proto) |
| 94 | return EINVAL; |
| 95 | |
| 96 | err = media_alloc(&m, &sess->lmedial); |
| 97 | if (err) |
| 98 | return err; |
| 99 | |
| 100 | err = str_dup(&m->name, name); |
| 101 | err |= str_dup(&m->proto, proto); |
| 102 | if (err) |
| 103 | goto out; |
| 104 | |
| 105 | sa_set_port(&m->laddr, port); |
| 106 | |
| 107 | out: |
| 108 | if (err) |
| 109 | mem_deref(m); |
| 110 | else if (mp) |
| 111 | *mp = m; |
| 112 | |
| 113 | return err; |
| 114 | } |
| 115 | |
| 116 | |
| 117 | /** |
| 118 | * Add a remote SDP media line to an SDP Session |
| 119 | * |
| 120 | * @param mp Pointer to allocated SDP Media line object |
| 121 | * @param sess SDP Session |
| 122 | * @param name Media name |
| 123 | * @param proto Transport protocol |
| 124 | * |
| 125 | * @return 0 if success, otherwise errorcode |
| 126 | */ |
| 127 | int sdp_media_radd(struct sdp_media **mp, struct sdp_session *sess, |
| 128 | const struct pl *name, const struct pl *proto) |
| 129 | { |
| 130 | struct sdp_media *m; |
| 131 | int err; |
| 132 | |
| 133 | if (!mp || !sess || !name || !proto) |
| 134 | return EINVAL; |
| 135 | |
| 136 | err = media_alloc(&m, &sess->medial); |
| 137 | if (err) |
| 138 | return err; |
| 139 | |
| 140 | m->disabled = true; |
| 141 | |
| 142 | err = pl_strdup(&m->name, name); |
| 143 | err |= pl_strdup(&m->proto, proto); |
| 144 | |
| 145 | if (err) |
| 146 | mem_deref(m); |
| 147 | else |
| 148 | *mp = m; |
| 149 | |
| 150 | return err; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | /** |
| 155 | * Reset the remote part of an SDP Media line |
| 156 | * |
| 157 | * @param m SDP Media line |
| 158 | */ |
| 159 | void sdp_media_rreset(struct sdp_media *m) |
| 160 | { |
| 161 | int i; |
| 162 | |
| 163 | if (!m) |
| 164 | return; |
| 165 | |
| 166 | sa_init(&m->raddr, AF_INET); |
| 167 | sa_init(&m->raddr_rtcp, AF_INET); |
| 168 | |
| 169 | list_flush(&m->rfmtl); |
| 170 | list_flush(&m->rattrl); |
| 171 | |
| 172 | m->rdir = SDP_SENDRECV; |
| 173 | |
| 174 | for (i=0; i<SDP_BANDWIDTH_MAX; i++) |
| 175 | m->rbwv[i] = -1; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /** |
| 180 | * Compare media line protocols |
| 181 | * |
| 182 | * @param m SDP Media line |
| 183 | * @param proto Transport protocol |
| 184 | * @param update Update media protocol if match is found in alternate set |
| 185 | * |
| 186 | * @return True if matching, False if not |
| 187 | */ |
| 188 | bool sdp_media_proto_cmp(struct sdp_media *m, const struct pl *proto, |
| 189 | bool update) |
| 190 | { |
| 191 | unsigned i; |
| 192 | |
| 193 | if (!m || !proto) |
| 194 | return false; |
| 195 | |
| 196 | if (!pl_strcmp(proto, m->proto)) |
| 197 | return true; |
| 198 | |
| 199 | for (i=0; i<ARRAY_SIZE(m->protov); i++) { |
| 200 | |
| 201 | if (!m->protov[i] || pl_strcmp(proto, m->protov[i])) |
| 202 | continue; |
| 203 | |
| 204 | if (update) { |
| 205 | mem_deref(m->proto); |
| 206 | m->proto = mem_ref(m->protov[i]); |
| 207 | } |
| 208 | |
| 209 | return true; |
| 210 | } |
| 211 | |
| 212 | return false; |
| 213 | } |
| 214 | |
| 215 | |
| 216 | /** |
| 217 | * Find an SDP Media line from name and transport protocol |
| 218 | * |
| 219 | * @param sess SDP Session |
| 220 | * @param name Media name |
| 221 | * @param proto Transport protocol |
| 222 | * @param update_proto Update media transport protocol |
| 223 | * |
| 224 | * @return Matching media line if found, NULL if not found |
| 225 | */ |
| 226 | struct sdp_media *sdp_media_find(const struct sdp_session *sess, |
| 227 | const struct pl *name, |
| 228 | const struct pl *proto, |
| 229 | bool update_proto) |
| 230 | { |
| 231 | struct le *le; |
| 232 | |
| 233 | if (!sess || !name || !proto) |
| 234 | return NULL; |
| 235 | |
| 236 | for (le=sess->lmedial.head; le; le=le->next) { |
| 237 | |
| 238 | struct sdp_media *m = le->data; |
| 239 | |
| 240 | if (pl_strcmp(name, m->name)) |
| 241 | continue; |
| 242 | |
| 243 | if (!sdp_media_proto_cmp(m, proto, update_proto)) |
| 244 | continue; |
| 245 | |
| 246 | return m; |
| 247 | } |
| 248 | |
| 249 | return NULL; |
| 250 | } |
| 251 | |
| 252 | |
| 253 | /** |
| 254 | * Align the locate/remote formats of an SDP Media line |
| 255 | * |
| 256 | * @param m SDP Media line |
| 257 | * @param offer True if SDP Offer, False if SDP Answer |
| 258 | */ |
| 259 | void sdp_media_align_formats(struct sdp_media *m, bool offer) |
| 260 | { |
| 261 | struct sdp_format *rfmt, *lfmt; |
| 262 | struct le *rle, *lle; |
| 263 | |
| 264 | if (!m || m->disabled || !sa_port(&m->raddr) || m->fmt_ignore) |
| 265 | return; |
| 266 | |
| 267 | for (lle=m->lfmtl.head; lle; lle=lle->next) { |
| 268 | |
| 269 | lfmt = lle->data; |
| 270 | |
| 271 | lfmt->rparams = mem_deref(lfmt->rparams); |
| 272 | lfmt->sup = false; |
| 273 | } |
| 274 | |
| 275 | for (rle=m->rfmtl.head; rle; rle=rle->next) { |
| 276 | |
| 277 | rfmt = rle->data; |
| 278 | |
| 279 | for (lle=m->lfmtl.head; lle; lle=lle->next) { |
| 280 | |
| 281 | lfmt = lle->data; |
| 282 | |
| 283 | if (sdp_format_cmp(lfmt, rfmt)) |
| 284 | break; |
| 285 | } |
| 286 | |
| 287 | if (!lle) { |
| 288 | rfmt->sup = false; |
| 289 | continue; |
| 290 | } |
| 291 | |
| 292 | mem_deref(lfmt->rparams); |
| 293 | lfmt->rparams = mem_ref(rfmt->params); |
| 294 | |
| 295 | lfmt->sup = true; |
| 296 | rfmt->sup = true; |
| 297 | |
| 298 | if (rfmt->ref) |
| 299 | rfmt->data = mem_deref(rfmt->data); |
| 300 | else |
| 301 | rfmt->data = NULL; |
| 302 | |
| 303 | if (lfmt->ref) |
| 304 | rfmt->data = mem_ref(lfmt->data); |
| 305 | else |
| 306 | rfmt->data = lfmt->data; |
| 307 | |
| 308 | rfmt->ref = lfmt->ref; |
| 309 | |
| 310 | if (offer) { |
| 311 | mem_deref(lfmt->id); |
| 312 | lfmt->id = mem_ref(rfmt->id); |
| 313 | lfmt->pt = atoi(lfmt->id ? lfmt->id : ""); |
| 314 | |
| 315 | list_unlink(&lfmt->le); |
| 316 | list_append(&m->lfmtl, &lfmt->le, lfmt); |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | if (offer) { |
| 321 | |
| 322 | for (lle=m->lfmtl.tail; lle; ) { |
| 323 | |
| 324 | lfmt = lle->data; |
| 325 | |
| 326 | lle = lle->prev; |
| 327 | |
| 328 | if (!lfmt->sup) { |
| 329 | list_unlink(&lfmt->le); |
| 330 | list_append(&m->lfmtl, &lfmt->le, lfmt); |
| 331 | } |
| 332 | } |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | |
| 337 | /** |
| 338 | * Set alternative protocols for an SDP Media line |
| 339 | * |
| 340 | * @param m SDP Media line |
| 341 | * @param protoc Number of alternative protocols |
| 342 | * |
| 343 | * @return 0 if success, otherwise errorcode |
| 344 | */ |
| 345 | int sdp_media_set_alt_protos(struct sdp_media *m, unsigned protoc, ...) |
| 346 | { |
| 347 | const char *proto; |
| 348 | int err = 0; |
| 349 | unsigned i; |
| 350 | va_list ap; |
| 351 | |
| 352 | if (!m) |
| 353 | return EINVAL; |
| 354 | |
| 355 | va_start(ap, protoc); |
| 356 | |
| 357 | for (i=0; i<ARRAY_SIZE(m->protov); i++) { |
| 358 | |
| 359 | m->protov[i] = mem_deref(m->protov[i]); |
| 360 | |
| 361 | if (i >= protoc) |
| 362 | continue; |
| 363 | |
| 364 | proto = va_arg(ap, const char *); |
| 365 | if (proto) |
| 366 | err |= str_dup(&m->protov[i], proto); |
| 367 | } |
| 368 | |
| 369 | va_end(ap); |
| 370 | |
| 371 | return err; |
| 372 | } |
| 373 | |
| 374 | |
| 375 | /** |
| 376 | * Set SDP Media line encode handler |
| 377 | * |
| 378 | * @param m SDP Media line |
| 379 | * @param ench Encode handler |
| 380 | * @param arg Encode handler argument |
| 381 | */ |
| 382 | void sdp_media_set_encode_handler(struct sdp_media *m, sdp_media_enc_h *ench, |
| 383 | void *arg) |
| 384 | { |
| 385 | if (!m) |
| 386 | return; |
| 387 | |
| 388 | m->ench = ench; |
| 389 | m->arg = arg; |
| 390 | } |
| 391 | |
| 392 | |
| 393 | /** |
| 394 | * Set an SDP Media line to ignore formats |
| 395 | * |
| 396 | * @param m SDP Media line |
| 397 | * @param fmt_ignore True for ignore formats, otherwise false |
| 398 | */ |
| 399 | void sdp_media_set_fmt_ignore(struct sdp_media *m, bool fmt_ignore) |
| 400 | { |
| 401 | if (!m) |
| 402 | return; |
| 403 | |
| 404 | m->fmt_ignore = fmt_ignore; |
| 405 | } |
| 406 | |
| 407 | |
| 408 | /** |
| 409 | * Set an SDP Media line to enabled/disabled |
| 410 | * |
| 411 | * @param m SDP Media line |
| 412 | * @param disabled True for disabled, False for enabled |
| 413 | */ |
| 414 | void sdp_media_set_disabled(struct sdp_media *m, bool disabled) |
| 415 | { |
| 416 | if (!m) |
| 417 | return; |
| 418 | |
| 419 | m->disabled = disabled; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | /** |
| 424 | * Set the local port number of an SDP Media line |
| 425 | * |
| 426 | * @param m SDP Media line |
| 427 | * @param port Port number |
| 428 | */ |
| 429 | void sdp_media_set_lport(struct sdp_media *m, uint16_t port) |
| 430 | { |
| 431 | if (!m) |
| 432 | return; |
| 433 | |
| 434 | sa_set_port(&m->laddr, port); |
| 435 | } |
| 436 | |
| 437 | |
| 438 | /** |
| 439 | * Set the local network address of an SDP media line |
| 440 | * |
| 441 | * @param m SDP Media line |
| 442 | * @param laddr Local network address |
| 443 | */ |
| 444 | void sdp_media_set_laddr(struct sdp_media *m, const struct sa *laddr) |
| 445 | { |
| 446 | if (!m || !laddr) |
| 447 | return; |
| 448 | |
| 449 | m->laddr = *laddr; |
| 450 | } |
| 451 | |
| 452 | |
| 453 | /** |
| 454 | * Set a local bandwidth of an SDP Media line |
| 455 | * |
| 456 | * @param m SDP Media line |
| 457 | * @param type Bandwidth type |
| 458 | * @param bw Bandwidth value |
| 459 | */ |
| 460 | void sdp_media_set_lbandwidth(struct sdp_media *m, enum sdp_bandwidth type, |
| 461 | int32_t bw) |
| 462 | { |
| 463 | if (!m || type >= SDP_BANDWIDTH_MAX) |
| 464 | return; |
| 465 | |
| 466 | m->lbwv[type] = bw; |
| 467 | } |
| 468 | |
| 469 | |
| 470 | /** |
| 471 | * Set the local RTCP port number of an SDP Media line |
| 472 | * |
| 473 | * @param m SDP Media line |
| 474 | * @param port RTCP Port number |
| 475 | */ |
| 476 | void sdp_media_set_lport_rtcp(struct sdp_media *m, uint16_t port) |
| 477 | { |
| 478 | if (!m) |
| 479 | return; |
| 480 | |
| 481 | sa_set_port(&m->laddr_rtcp, port); |
| 482 | } |
| 483 | |
| 484 | |
| 485 | /** |
| 486 | * Set the local RTCP network address of an SDP media line |
| 487 | * |
| 488 | * @param m SDP Media line |
| 489 | * @param laddr Local RTCP network address |
| 490 | */ |
| 491 | void sdp_media_set_laddr_rtcp(struct sdp_media *m, const struct sa *laddr) |
| 492 | { |
| 493 | if (!m || !laddr) |
| 494 | return; |
| 495 | |
| 496 | m->laddr_rtcp = *laddr; |
| 497 | } |
| 498 | |
| 499 | |
| 500 | /** |
| 501 | * Set the local direction flag of an SDP Media line |
| 502 | * |
| 503 | * @param m SDP Media line |
| 504 | * @param dir Media direction flag |
| 505 | */ |
| 506 | void sdp_media_set_ldir(struct sdp_media *m, enum sdp_dir dir) |
| 507 | { |
| 508 | if (!m) |
| 509 | return; |
| 510 | |
| 511 | m->ldir = dir; |
| 512 | } |
| 513 | |
| 514 | |
| 515 | /** |
| 516 | * Set a local attribute of an SDP Media line |
| 517 | * |
| 518 | * @param m SDP Media line |
| 519 | * @param replace True to replace attribute, False to append |
| 520 | * @param name Attribute name |
| 521 | * @param value Formatted attribute value |
| 522 | * |
| 523 | * @return 0 if success, otherwise errorcode |
| 524 | */ |
| 525 | int sdp_media_set_lattr(struct sdp_media *m, bool replace, |
| 526 | const char *name, const char *value, ...) |
| 527 | { |
| 528 | va_list ap; |
| 529 | int err; |
| 530 | |
| 531 | if (!m || !name) |
| 532 | return EINVAL; |
| 533 | |
| 534 | if (replace) |
| 535 | sdp_attr_del(&m->lattrl, name); |
| 536 | |
| 537 | va_start(ap, value); |
| 538 | err = sdp_attr_addv(&m->lattrl, name, value, ap); |
| 539 | va_end(ap); |
| 540 | |
| 541 | return err; |
| 542 | } |
| 543 | |
| 544 | |
| 545 | /** |
| 546 | * Delete a local attribute of an SDP Media line |
| 547 | * |
| 548 | * @param m SDP Media line |
| 549 | * @param name Attribute name |
| 550 | */ |
| 551 | void sdp_media_del_lattr(struct sdp_media *m, const char *name) |
| 552 | { |
| 553 | if (!m || !name) |
| 554 | return; |
| 555 | |
| 556 | sdp_attr_del(&m->lattrl, name); |
| 557 | } |
| 558 | |
| 559 | |
| 560 | const char *sdp_media_proto(const struct sdp_media *m) |
| 561 | { |
| 562 | return m ? m->proto : NULL; |
| 563 | } |
| 564 | |
| 565 | |
| 566 | /** |
| 567 | * Get the remote port number of an SDP Media line |
| 568 | * |
| 569 | * @param m SDP Media line |
| 570 | * |
| 571 | * @return Remote port number |
| 572 | */ |
| 573 | uint16_t sdp_media_rport(const struct sdp_media *m) |
| 574 | { |
| 575 | return m ? sa_port(&m->raddr) : 0; |
| 576 | } |
| 577 | |
| 578 | |
| 579 | /** |
| 580 | * Get the remote network address of an SDP Media line |
| 581 | * |
| 582 | * @param m SDP Media line |
| 583 | * |
| 584 | * @return Remote network address |
| 585 | */ |
| 586 | const struct sa *sdp_media_raddr(const struct sdp_media *m) |
| 587 | { |
| 588 | return m ? &m->raddr : NULL; |
| 589 | } |
| 590 | |
| 591 | |
| 592 | /** |
| 593 | * Get the local network address of an SDP Media line |
| 594 | * |
| 595 | * @param m SDP Media line |
| 596 | * |
| 597 | * @return Local network address |
| 598 | */ |
| 599 | const struct sa *sdp_media_laddr(const struct sdp_media *m) |
| 600 | { |
| 601 | return m ? &m->laddr : NULL; |
| 602 | } |
| 603 | |
| 604 | |
| 605 | /** |
| 606 | * Get the remote RTCP network address of an SDP Media line |
| 607 | * |
| 608 | * @param m SDP Media line |
| 609 | * @param raddr On return, contains remote RTCP network address |
| 610 | */ |
| 611 | void sdp_media_raddr_rtcp(const struct sdp_media *m, struct sa *raddr) |
| 612 | { |
| 613 | if (!m || !raddr) |
| 614 | return; |
| 615 | |
| 616 | if (sa_isset(&m->raddr_rtcp, SA_ALL)) { |
| 617 | *raddr = m->raddr_rtcp; |
| 618 | } |
| 619 | else if (sa_isset(&m->raddr_rtcp, SA_PORT)) { |
| 620 | *raddr = m->raddr; |
| 621 | sa_set_port(raddr, sa_port(&m->raddr_rtcp)); |
| 622 | } |
| 623 | else { |
| 624 | uint16_t port = sa_port(&m->raddr); |
| 625 | |
| 626 | *raddr = m->raddr; |
| 627 | sa_set_port(raddr, port ? port + 1 : 0); |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | |
| 632 | /** |
| 633 | * Get a remote bandwidth of an SDP Media line |
| 634 | * |
| 635 | * @param m SDP Media line |
| 636 | * @param type Bandwidth type |
| 637 | * |
| 638 | * @return Remote bandwidth value |
| 639 | */ |
| 640 | int32_t sdp_media_rbandwidth(const struct sdp_media *m, |
| 641 | enum sdp_bandwidth type) |
| 642 | { |
| 643 | if (!m || type >= SDP_BANDWIDTH_MAX) |
| 644 | return 0; |
| 645 | |
| 646 | return m->rbwv[type]; |
| 647 | } |
| 648 | |
| 649 | |
| 650 | /** |
| 651 | * Get the local media direction of an SDP Media line |
| 652 | * |
| 653 | * @param m SDP Media line |
| 654 | * |
| 655 | * @return Local media direction |
| 656 | */ |
| 657 | enum sdp_dir sdp_media_ldir(const struct sdp_media *m) |
| 658 | { |
| 659 | return m ? m->ldir : SDP_INACTIVE; |
| 660 | } |
| 661 | |
| 662 | |
| 663 | /** |
| 664 | * Get the remote media direction of an SDP Media line |
| 665 | * |
| 666 | * @param m SDP Media line |
| 667 | * |
| 668 | * @return Remote media direction |
| 669 | */ |
| 670 | enum sdp_dir sdp_media_rdir(const struct sdp_media *m) |
| 671 | { |
| 672 | return m ? m->rdir : SDP_INACTIVE; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | /** |
| 677 | * Get the combined media direction of an SDP Media line |
| 678 | * |
| 679 | * @param m SDP Media line |
| 680 | * |
| 681 | * @return Combined media direction |
| 682 | */ |
| 683 | enum sdp_dir sdp_media_dir(const struct sdp_media *m) |
| 684 | { |
| 685 | return m ? (enum sdp_dir)(m->ldir & m->rdir) : SDP_INACTIVE; |
| 686 | } |
| 687 | |
| 688 | |
| 689 | /** |
| 690 | * Find a local SDP format from a payload type |
| 691 | * |
| 692 | * @param m SDP Media line |
| 693 | * @param pt Payload type |
| 694 | * |
| 695 | * @return Local SDP format if found, NULL if not found |
| 696 | */ |
| 697 | const struct sdp_format *sdp_media_lformat(const struct sdp_media *m, int pt) |
| 698 | { |
| 699 | struct le *le; |
| 700 | |
| 701 | if (!m) |
| 702 | return NULL; |
| 703 | |
| 704 | for (le=m->lfmtl.head; le; le=le->next) { |
| 705 | |
| 706 | const struct sdp_format *fmt = le->data; |
| 707 | |
| 708 | if (pt == fmt->pt) |
| 709 | return fmt; |
| 710 | } |
| 711 | |
| 712 | return NULL; |
| 713 | } |
| 714 | |
| 715 | |
| 716 | /** |
| 717 | * Find a remote SDP format from a format name |
| 718 | * |
| 719 | * @param m SDP Media line |
| 720 | * @param name Format name |
| 721 | * |
| 722 | * @return Remote SDP format if found, NULL if not found |
| 723 | */ |
| 724 | const struct sdp_format *sdp_media_rformat(const struct sdp_media *m, |
| 725 | const char *name) |
| 726 | { |
| 727 | struct le *le; |
| 728 | |
| 729 | if (!m || !sa_port(&m->raddr)) |
| 730 | return NULL; |
| 731 | |
| 732 | for (le=m->rfmtl.head; le; le=le->next) { |
| 733 | |
| 734 | const struct sdp_format *fmt = le->data; |
| 735 | |
| 736 | if (!fmt->sup) |
| 737 | continue; |
| 738 | |
| 739 | if (name && str_casecmp(name, fmt->name)) |
| 740 | continue; |
| 741 | |
| 742 | return fmt; |
| 743 | } |
| 744 | |
| 745 | return NULL; |
| 746 | } |
| 747 | |
| 748 | |
| 749 | /** |
| 750 | * Find an SDP Format of an SDP Media line |
| 751 | * |
| 752 | * @param m SDP Media line |
| 753 | * @param local True if local media, False if remote |
| 754 | * @param id SDP format id |
| 755 | * @param pt Payload type |
| 756 | * @param name Format name |
| 757 | * @param srate Sampling rate |
| 758 | * @param ch Number of channels |
| 759 | * |
| 760 | * @return SDP Format if found, NULL if not found |
| 761 | */ |
| 762 | struct sdp_format *sdp_media_format(const struct sdp_media *m, |
| 763 | bool local, const char *id, |
| 764 | int pt, const char *name, |
| 765 | int32_t srate, int8_t ch) |
| 766 | { |
| 767 | return sdp_media_format_apply(m, local, id, pt, name, srate, ch, |
| 768 | NULL, NULL); |
| 769 | } |
| 770 | |
| 771 | |
| 772 | /** |
| 773 | * Apply a function handler to all matching SDP formats |
| 774 | * |
| 775 | * @param m SDP Media line |
| 776 | * @param local True if local media, False if remote |
| 777 | * @param id SDP format id |
| 778 | * @param pt Payload type |
| 779 | * @param name Format name |
| 780 | * @param srate Sampling rate |
| 781 | * @param ch Number of channels |
| 782 | * @param fmth SDP Format handler |
| 783 | * @param arg Handler argument |
| 784 | * |
| 785 | * @return SDP Format if found, NULL if not found |
| 786 | */ |
| 787 | struct sdp_format *sdp_media_format_apply(const struct sdp_media *m, |
| 788 | bool local, const char *id, |
| 789 | int pt, const char *name, |
| 790 | int32_t srate, int8_t ch, |
| 791 | sdp_format_h *fmth, void *arg) |
| 792 | { |
| 793 | struct le *le; |
| 794 | |
| 795 | if (!m) |
| 796 | return NULL; |
| 797 | |
| 798 | le = local ? m->lfmtl.head : m->rfmtl.head; |
| 799 | |
| 800 | while (le) { |
| 801 | |
| 802 | struct sdp_format *fmt = le->data; |
| 803 | |
| 804 | le = le->next; |
| 805 | |
| 806 | if (id && (!fmt->id || strcmp(id, fmt->id))) |
| 807 | continue; |
| 808 | |
| 809 | if (pt >= 0 && pt != fmt->pt) |
| 810 | continue; |
| 811 | |
| 812 | if (name && str_casecmp(name, fmt->name)) |
| 813 | continue; |
| 814 | |
| 815 | if (srate >= 0 && (uint32_t)srate != fmt->srate) |
| 816 | continue; |
| 817 | |
| 818 | if (ch >= 0 && (uint8_t)ch != fmt->ch) |
| 819 | continue; |
| 820 | |
| 821 | if (!fmth || fmth(fmt, arg)) |
| 822 | return fmt; |
| 823 | } |
| 824 | |
| 825 | return NULL; |
| 826 | } |
| 827 | |
| 828 | |
| 829 | /** |
| 830 | * Get the list of SDP Formats |
| 831 | * |
| 832 | * @param m SDP Media line |
| 833 | * @param local True if local, False if remote |
| 834 | * |
| 835 | * @return List of SDP Formats |
| 836 | */ |
| 837 | const struct list *sdp_media_format_lst(const struct sdp_media *m, bool local) |
| 838 | { |
| 839 | if (!m) |
| 840 | return NULL; |
| 841 | |
| 842 | return local ? &m->lfmtl : &m->rfmtl; |
| 843 | } |
| 844 | |
| 845 | |
| 846 | /** |
| 847 | * Get a remote attribute from an SDP Media line |
| 848 | * |
| 849 | * @param m SDP Media line |
| 850 | * @param name Attribute name |
| 851 | * |
| 852 | * @return Attribute value, NULL if not found |
| 853 | */ |
| 854 | const char *sdp_media_rattr(const struct sdp_media *m, const char *name) |
| 855 | { |
| 856 | if (!m || !name) |
| 857 | return NULL; |
| 858 | |
| 859 | return sdp_attr_apply(&m->rattrl, name, NULL, NULL); |
| 860 | } |
| 861 | |
| 862 | |
| 863 | /** |
| 864 | * Get a remote attribute from an SDP Media line or the SDP session |
| 865 | * |
| 866 | * @param m SDP Media line |
| 867 | * @param sess SDP Session |
| 868 | * @param name Attribute name |
| 869 | * |
| 870 | * @return Attribute value, NULL if not found |
| 871 | */ |
| 872 | const char *sdp_media_session_rattr(const struct sdp_media *m, |
| 873 | const struct sdp_session *sess, |
| 874 | const char *name) |
| 875 | { |
| 876 | const char *val; |
| 877 | |
| 878 | val = sdp_media_rattr(m, name); |
| 879 | if (!val) |
| 880 | val = sdp_session_rattr(sess, name); |
| 881 | |
| 882 | return val; |
| 883 | } |
| 884 | |
| 885 | |
| 886 | /** |
| 887 | * Apply a function handler to all matching remote attributes |
| 888 | * |
| 889 | * @param m SDP Media line |
| 890 | * @param name Attribute name |
| 891 | * @param attrh Attribute handler |
| 892 | * @param arg Handler argument |
| 893 | * |
| 894 | * @return Attribute value if match |
| 895 | */ |
| 896 | const char *sdp_media_rattr_apply(const struct sdp_media *m, const char *name, |
| 897 | sdp_attr_h *attrh, void *arg) |
| 898 | { |
| 899 | if (!m) |
| 900 | return NULL; |
| 901 | |
| 902 | return sdp_attr_apply(&m->rattrl, name, attrh, arg); |
| 903 | } |
| 904 | |
| 905 | |
| 906 | /** |
| 907 | * Get the name of an SDP Media line |
| 908 | * |
| 909 | * @param m SDP Media line |
| 910 | * |
| 911 | * @return SDP Media line name |
| 912 | */ |
| 913 | const char *sdp_media_name(const struct sdp_media *m) |
| 914 | { |
| 915 | return m ? m->name : NULL; |
| 916 | } |
| 917 | |
| 918 | |
| 919 | /** |
| 920 | * Print SDP Media line debug information |
| 921 | * |
| 922 | * @param pf Print function for output |
| 923 | * @param m SDP Media line |
| 924 | * |
| 925 | * @return 0 if success, otherwise errorcode |
| 926 | */ |
| 927 | int sdp_media_debug(struct re_printf *pf, const struct sdp_media *m) |
| 928 | { |
| 929 | struct le *le; |
| 930 | int err; |
| 931 | |
| 932 | if (!m) |
| 933 | return 0; |
| 934 | |
| 935 | err = re_hprintf(pf, "%s %s\n", m->name, m->proto); |
| 936 | |
| 937 | err |= re_hprintf(pf, " local formats:\n"); |
| 938 | |
| 939 | for (le=m->lfmtl.head; le; le=le->next) |
| 940 | err |= re_hprintf(pf, " %H\n", sdp_format_debug, le->data); |
| 941 | |
| 942 | err |= re_hprintf(pf, " remote formats:\n"); |
| 943 | |
| 944 | for (le=m->rfmtl.head; le; le=le->next) |
| 945 | err |= re_hprintf(pf, " %H\n", sdp_format_debug, le->data); |
| 946 | |
| 947 | err |= re_hprintf(pf, " local attributes:\n"); |
| 948 | |
| 949 | for (le=m->lattrl.head; le; le=le->next) |
| 950 | err |= re_hprintf(pf, " %H\n", sdp_attr_debug, le->data); |
| 951 | |
| 952 | err |= re_hprintf(pf, " remote attributes:\n"); |
| 953 | |
| 954 | for (le=m->rattrl.head; le; le=le->next) |
| 955 | err |= re_hprintf(pf, " %H\n", sdp_attr_debug, le->data); |
| 956 | |
| 957 | return err; |
| 958 | } |