1 /* 2 * dvb_demux.c - DVB kernel demux API 3 * 4 * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de> 5 * & Marcus Metzler <marcus@convergence.de> 6 * for convergence integrated media GmbH 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public License 10 * as published by the Free Software Foundation; either version 2.1 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 * 22 */ 23 24 #include <linux/sched.h> 25 #include <linux/spinlock.h> 26 #include <linux/slab.h> 27 #include <linux/vmalloc.h> 28 #include <linux/module.h> 29 #include <linux/poll.h> 30 #include <linux/string.h> 31 #include <linux/crc32.h> 32 #include <asm/uaccess.h> 33 #include <asm/div64.h> 34 35 #include "dvb_demux.h" 36 37 #define NOBUFS 38 /* 39 ** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog 40 */ 41 // #define DVB_DEMUX_SECTION_LOSS_LOG 42 43 static int dvb_demux_tscheck; 44 module_param(dvb_demux_tscheck, int, 0644); 45 MODULE_PARM_DESC(dvb_demux_tscheck, 46 "enable transport stream continuity and TEI check"); 47 48 static int dvb_demux_speedcheck; 49 module_param(dvb_demux_speedcheck, int, 0644); 50 MODULE_PARM_DESC(dvb_demux_speedcheck, 51 "enable transport stream speed check"); 52 53 static int dvb_demux_feed_err_pkts = 1; 54 module_param(dvb_demux_feed_err_pkts, int, 0644); 55 MODULE_PARM_DESC(dvb_demux_feed_err_pkts, 56 "when set to 0, drop packets with the TEI bit set (1 by default)"); 57 58 #define dprintk_tscheck(x...) do { \ 59 if (dvb_demux_tscheck && printk_ratelimit()) \ 60 printk(x); \ 61 } while (0) 62 63 /****************************************************************************** 64 * static inlined helper functions 65 ******************************************************************************/ 66 67 static inline u16 section_length(const u8 *buf) 68 { 69 return 3 + ((buf[1] & 0x0f) << 8) + buf[2]; 70 } 71 72 static inline u16 ts_pid(const u8 *buf) 73 { 74 return ((buf[1] & 0x1f) << 8) + buf[2]; 75 } 76 77 static inline u8 payload(const u8 *tsp) 78 { 79 if (!(tsp[3] & 0x10)) // no payload? 80 return 0; 81 82 if (tsp[3] & 0x20) { // adaptation field? 83 if (tsp[4] > 183) // corrupted data? 84 return 0; 85 else 86 return 184 - 1 - tsp[4]; 87 } 88 89 return 184; 90 } 91 92 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len) 93 { 94 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len)); 95 } 96 97 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s, 98 size_t len) 99 { 100 memcpy(d, s, len); 101 } 102 103 /****************************************************************************** 104 * Software filter functions 105 ******************************************************************************/ 106 107 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed, 108 const u8 *buf) 109 { 110 int count = payload(buf); 111 int p; 112 //int ccok; 113 //u8 cc; 114 115 if (count == 0) 116 return -1; 117 118 p = 188 - count; 119 120 /* 121 cc = buf[3] & 0x0f; 122 ccok = ((feed->cc + 1) & 0x0f) == cc; 123 feed->cc = cc; 124 if (!ccok) 125 printk("missed packet!\n"); 126 */ 127 128 if (buf[1] & 0x40) // PUSI ? 129 feed->peslen = 0xfffa; 130 131 feed->peslen += count; 132 133 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK); 134 } 135 136 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed, 137 struct dvb_demux_filter *f) 138 { 139 u8 neq = 0; 140 int i; 141 142 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 143 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i]; 144 145 if (f->maskandmode[i] & xor) 146 return 0; 147 148 neq |= f->maskandnotmode[i] & xor; 149 } 150 151 if (f->doneq && !neq) 152 return 0; 153 154 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen, 155 NULL, 0, &f->filter, DMX_OK); 156 } 157 158 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed) 159 { 160 struct dvb_demux *demux = feed->demux; 161 struct dvb_demux_filter *f = feed->filter; 162 struct dmx_section_feed *sec = &feed->feed.sec; 163 int section_syntax_indicator; 164 165 if (!sec->is_filtering) 166 return 0; 167 168 if (!f) 169 return 0; 170 171 if (sec->check_crc) { 172 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0); 173 if (section_syntax_indicator && 174 demux->check_crc32(feed, sec->secbuf, sec->seclen)) 175 return -1; 176 } 177 178 do { 179 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0) 180 return -1; 181 } while ((f = f->next) && sec->is_filtering); 182 183 sec->seclen = 0; 184 185 return 0; 186 } 187 188 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed) 189 { 190 struct dmx_section_feed *sec = &feed->feed.sec; 191 192 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 193 if (sec->secbufp < sec->tsfeedp) { 194 int i, n = sec->tsfeedp - sec->secbufp; 195 196 /* 197 * Section padding is done with 0xff bytes entirely. 198 * Due to speed reasons, we won't check all of them 199 * but just first and last. 200 */ 201 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) { 202 printk("dvb_demux.c section ts padding loss: %d/%d\n", 203 n, sec->tsfeedp); 204 printk("dvb_demux.c pad data:"); 205 for (i = 0; i < n; i++) 206 printk(" %02x", sec->secbuf[i]); 207 printk("\n"); 208 } 209 } 210 #endif 211 212 sec->tsfeedp = sec->secbufp = sec->seclen = 0; 213 sec->secbuf = sec->secbuf_base; 214 } 215 216 /* 217 * Losless Section Demux 1.4.1 by Emard 218 * Valsecchi Patrick: 219 * - middle of section A (no PUSI) 220 * - end of section A and start of section B 221 * (with PUSI pointing to the start of the second section) 222 * 223 * In this case, without feed->pusi_seen you'll receive a garbage section 224 * consisting of the end of section A. Basically because tsfeedp 225 * is incemented and the use=0 condition is not raised 226 * when the second packet arrives. 227 * 228 * Fix: 229 * when demux is started, let feed->pusi_seen = 0 to 230 * prevent initial feeding of garbage from the end of 231 * previous section. When you for the first time see PUSI=1 232 * then set feed->pusi_seen = 1 233 */ 234 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed, 235 const u8 *buf, u8 len) 236 { 237 struct dvb_demux *demux = feed->demux; 238 struct dmx_section_feed *sec = &feed->feed.sec; 239 u16 limit, seclen, n; 240 241 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE) 242 return 0; 243 244 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) { 245 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 246 printk("dvb_demux.c section buffer full loss: %d/%d\n", 247 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE, 248 DMX_MAX_SECFEED_SIZE); 249 #endif 250 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp; 251 } 252 253 if (len <= 0) 254 return 0; 255 256 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len); 257 sec->tsfeedp += len; 258 259 /* 260 * Dump all the sections we can find in the data (Emard) 261 */ 262 limit = sec->tsfeedp; 263 if (limit > DMX_MAX_SECFEED_SIZE) 264 return -1; /* internal error should never happen */ 265 266 /* to be sure always set secbuf */ 267 sec->secbuf = sec->secbuf_base + sec->secbufp; 268 269 for (n = 0; sec->secbufp + 2 < limit; n++) { 270 seclen = section_length(sec->secbuf); 271 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE 272 || seclen + sec->secbufp > limit) 273 return 0; 274 sec->seclen = seclen; 275 sec->crc_val = ~0; 276 /* dump [secbuf .. secbuf+seclen) */ 277 if (feed->pusi_seen) 278 dvb_dmx_swfilter_section_feed(feed); 279 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 280 else 281 printk("dvb_demux.c pusi not seen, discarding section data\n"); 282 #endif 283 sec->secbufp += seclen; /* secbufp and secbuf moving together is */ 284 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */ 285 } 286 287 return 0; 288 } 289 290 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, 291 const u8 *buf) 292 { 293 u8 p, count; 294 int ccok, dc_i = 0; 295 u8 cc; 296 297 count = payload(buf); 298 299 if (count == 0) /* count == 0 if no payload or out of range */ 300 return -1; 301 302 p = 188 - count; /* payload start */ 303 304 cc = buf[3] & 0x0f; 305 ccok = ((feed->cc + 1) & 0x0f) == cc; 306 feed->cc = cc; 307 308 if (buf[3] & 0x20) { 309 /* adaption field present, check for discontinuity_indicator */ 310 if ((buf[4] > 0) && (buf[5] & 0x80)) 311 dc_i = 1; 312 } 313 314 if (!ccok || dc_i) { 315 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 316 printk("dvb_demux.c discontinuity detected %d bytes lost\n", 317 count); 318 /* 319 * those bytes under sume circumstances will again be reported 320 * in the following dvb_dmx_swfilter_section_new 321 */ 322 #endif 323 /* 324 * Discontinuity detected. Reset pusi_seen = 0 to 325 * stop feeding of suspicious data until next PUSI=1 arrives 326 */ 327 feed->pusi_seen = 0; 328 dvb_dmx_swfilter_section_new(feed); 329 } 330 331 if (buf[1] & 0x40) { 332 /* PUSI=1 (is set), section boundary is here */ 333 if (count > 1 && buf[p] < count) { 334 const u8 *before = &buf[p + 1]; 335 u8 before_len = buf[p]; 336 const u8 *after = &before[before_len]; 337 u8 after_len = count - 1 - before_len; 338 339 dvb_dmx_swfilter_section_copy_dump(feed, before, 340 before_len); 341 /* before start of new section, set pusi_seen = 1 */ 342 feed->pusi_seen = 1; 343 dvb_dmx_swfilter_section_new(feed); 344 dvb_dmx_swfilter_section_copy_dump(feed, after, 345 after_len); 346 } 347 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 348 else if (count > 0) 349 printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count); 350 #endif 351 } else { 352 /* PUSI=0 (is not set), no section boundary */ 353 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count); 354 } 355 356 return 0; 357 } 358 359 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed, 360 const u8 *buf) 361 { 362 switch (feed->type) { 363 case DMX_TYPE_TS: 364 if (!feed->feed.ts.is_filtering) 365 break; 366 if (feed->ts_type & TS_PACKET) { 367 if (feed->ts_type & TS_PAYLOAD_ONLY) 368 dvb_dmx_swfilter_payload(feed, buf); 369 else 370 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, 371 DMX_OK); 372 } 373 if (feed->ts_type & TS_DECODER) 374 if (feed->demux->write_to_decoder) 375 feed->demux->write_to_decoder(feed, buf, 188); 376 break; 377 378 case DMX_TYPE_SEC: 379 if (!feed->feed.sec.is_filtering) 380 break; 381 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0) 382 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0; 383 break; 384 385 default: 386 break; 387 } 388 } 389 390 #define DVR_FEED(f) \ 391 (((f)->type == DMX_TYPE_TS) && \ 392 ((f)->feed.ts.is_filtering) && \ 393 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET)) 394 395 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf) 396 { 397 struct dvb_demux_feed *feed; 398 u16 pid = ts_pid(buf); 399 int dvr_done = 0; 400 401 if (dvb_demux_speedcheck) { 402 struct timespec cur_time, delta_time; 403 u64 speed_bytes, speed_timedelta; 404 405 demux->speed_pkts_cnt++; 406 407 /* show speed every SPEED_PKTS_INTERVAL packets */ 408 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) { 409 cur_time = current_kernel_time(); 410 411 if (demux->speed_last_time.tv_sec != 0 && 412 demux->speed_last_time.tv_nsec != 0) { 413 delta_time = timespec_sub(cur_time, 414 demux->speed_last_time); 415 speed_bytes = (u64)demux->speed_pkts_cnt 416 * 188 * 8; 417 /* convert to 1024 basis */ 418 speed_bytes = 1000 * div64_u64(speed_bytes, 419 1024); 420 speed_timedelta = 421 (u64)timespec_to_ns(&delta_time); 422 speed_timedelta = div64_u64(speed_timedelta, 423 1000000); /* nsec -> usec */ 424 printk(KERN_INFO "TS speed %llu Kbits/sec \n", 425 div64_u64(speed_bytes, 426 speed_timedelta)); 427 } 428 429 demux->speed_last_time = cur_time; 430 demux->speed_pkts_cnt = 0; 431 } 432 } 433 434 if (buf[1] & 0x80) { 435 dprintk_tscheck("TEI detected. " 436 "PID=0x%x data1=0x%x\n", 437 pid, buf[1]); 438 /* data in this packet cant be trusted - drop it unless 439 * module option dvb_demux_feed_err_pkts is set */ 440 if (!dvb_demux_feed_err_pkts) 441 return; 442 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */ 443 if (demux->cnt_storage && dvb_demux_tscheck) { 444 /* check pkt counter */ 445 if (pid < MAX_PID) { 446 if (buf[3] & 0x10) 447 demux->cnt_storage[pid] = 448 (demux->cnt_storage[pid] + 1) & 0xf; 449 450 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) { 451 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n", 452 pid, demux->cnt_storage[pid], 453 buf[3] & 0xf); 454 demux->cnt_storage[pid] = buf[3] & 0xf; 455 } 456 } 457 /* end check */ 458 } 459 460 list_for_each_entry(feed, &demux->feed_list, list_head) { 461 if ((feed->pid != pid) && (feed->pid != 0x2000)) 462 continue; 463 464 /* copy each packet only once to the dvr device, even 465 * if a PID is in multiple filters (e.g. video + PCR) */ 466 if ((DVR_FEED(feed)) && (dvr_done++)) 467 continue; 468 469 if (feed->pid == pid) 470 dvb_dmx_swfilter_packet_type(feed, buf); 471 else if (feed->pid == 0x2000) 472 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK); 473 } 474 } 475 476 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, 477 size_t count) 478 { 479 spin_lock(&demux->lock); 480 481 while (count--) { 482 if (buf[0] == 0x47) 483 dvb_dmx_swfilter_packet(demux, buf); 484 buf += 188; 485 } 486 487 spin_unlock(&demux->lock); 488 } 489 490 EXPORT_SYMBOL(dvb_dmx_swfilter_packets); 491 492 static inline int find_next_packet(const u8 *buf, int pos, size_t count, 493 const int pktsize) 494 { 495 int start = pos, lost; 496 497 while (pos < count) { 498 if (buf[pos] == 0x47 || 499 (pktsize == 204 && buf[pos] == 0xB8)) 500 break; 501 pos++; 502 } 503 504 lost = pos - start; 505 if (lost) { 506 /* This garbage is part of a valid packet? */ 507 int backtrack = pos - pktsize; 508 if (backtrack >= 0 && (buf[backtrack] == 0x47 || 509 (pktsize == 204 && buf[backtrack] == 0xB8))) 510 return backtrack; 511 } 512 513 return pos; 514 } 515 516 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */ 517 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, 518 size_t count, const int pktsize) 519 { 520 int p = 0, i, j; 521 const u8 *q; 522 523 spin_lock(&demux->lock); 524 525 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */ 526 i = demux->tsbufp; 527 j = pktsize - i; 528 if (count < j) { 529 memcpy(&demux->tsbuf[i], buf, count); 530 demux->tsbufp += count; 531 goto bailout; 532 } 533 memcpy(&demux->tsbuf[i], buf, j); 534 if (demux->tsbuf[0] == 0x47) /* double check */ 535 dvb_dmx_swfilter_packet(demux, demux->tsbuf); 536 demux->tsbufp = 0; 537 p += j; 538 } 539 540 while (1) { 541 p = find_next_packet(buf, p, count, pktsize); 542 if (p >= count) 543 break; 544 if (count - p < pktsize) 545 break; 546 547 q = &buf[p]; 548 549 if (pktsize == 204 && (*q == 0xB8)) { 550 memcpy(demux->tsbuf, q, 188); 551 demux->tsbuf[0] = 0x47; 552 q = demux->tsbuf; 553 } 554 dvb_dmx_swfilter_packet(demux, q); 555 p += pktsize; 556 } 557 558 i = count - p; 559 if (i) { 560 memcpy(demux->tsbuf, &buf[p], i); 561 demux->tsbufp = i; 562 if (pktsize == 204 && demux->tsbuf[0] == 0xB8) 563 demux->tsbuf[0] = 0x47; 564 } 565 566 bailout: 567 spin_unlock(&demux->lock); 568 } 569 570 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count) 571 { 572 _dvb_dmx_swfilter(demux, buf, count, 188); 573 } 574 EXPORT_SYMBOL(dvb_dmx_swfilter); 575 576 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count) 577 { 578 _dvb_dmx_swfilter(demux, buf, count, 204); 579 } 580 EXPORT_SYMBOL(dvb_dmx_swfilter_204); 581 582 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count) 583 { 584 spin_lock(&demux->lock); 585 586 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, DMX_OK); 587 588 spin_unlock(&demux->lock); 589 } 590 EXPORT_SYMBOL(dvb_dmx_swfilter_raw); 591 592 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux) 593 { 594 int i; 595 596 for (i = 0; i < demux->filternum; i++) 597 if (demux->filter[i].state == DMX_STATE_FREE) 598 break; 599 600 if (i == demux->filternum) 601 return NULL; 602 603 demux->filter[i].state = DMX_STATE_ALLOCATED; 604 605 return &demux->filter[i]; 606 } 607 608 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux) 609 { 610 int i; 611 612 for (i = 0; i < demux->feednum; i++) 613 if (demux->feed[i].state == DMX_STATE_FREE) 614 break; 615 616 if (i == demux->feednum) 617 return NULL; 618 619 demux->feed[i].state = DMX_STATE_ALLOCATED; 620 621 return &demux->feed[i]; 622 } 623 624 static int dvb_demux_feed_find(struct dvb_demux_feed *feed) 625 { 626 struct dvb_demux_feed *entry; 627 628 list_for_each_entry(entry, &feed->demux->feed_list, list_head) 629 if (entry == feed) 630 return 1; 631 632 return 0; 633 } 634 635 static void dvb_demux_feed_add(struct dvb_demux_feed *feed) 636 { 637 spin_lock_irq(&feed->demux->lock); 638 if (dvb_demux_feed_find(feed)) { 639 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n", 640 __func__, feed->type, feed->state, feed->pid); 641 goto out; 642 } 643 644 list_add(&feed->list_head, &feed->demux->feed_list); 645 out: 646 spin_unlock_irq(&feed->demux->lock); 647 } 648 649 static void dvb_demux_feed_del(struct dvb_demux_feed *feed) 650 { 651 spin_lock_irq(&feed->demux->lock); 652 if (!(dvb_demux_feed_find(feed))) { 653 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n", 654 __func__, feed->type, feed->state, feed->pid); 655 goto out; 656 } 657 658 list_del(&feed->list_head); 659 out: 660 spin_unlock_irq(&feed->demux->lock); 661 } 662 663 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type, 664 enum dmx_ts_pes pes_type, 665 size_t circular_buffer_size, struct timespec timeout) 666 { 667 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 668 struct dvb_demux *demux = feed->demux; 669 670 if (pid > DMX_MAX_PID) 671 return -EINVAL; 672 673 if (mutex_lock_interruptible(&demux->mutex)) 674 return -ERESTARTSYS; 675 676 if (ts_type & TS_DECODER) { 677 if (pes_type >= DMX_PES_OTHER) { 678 mutex_unlock(&demux->mutex); 679 return -EINVAL; 680 } 681 682 if (demux->pesfilter[pes_type] && 683 demux->pesfilter[pes_type] != feed) { 684 mutex_unlock(&demux->mutex); 685 return -EINVAL; 686 } 687 688 demux->pesfilter[pes_type] = feed; 689 demux->pids[pes_type] = pid; 690 } 691 692 dvb_demux_feed_add(feed); 693 694 feed->pid = pid; 695 feed->buffer_size = circular_buffer_size; 696 feed->timeout = timeout; 697 feed->ts_type = ts_type; 698 feed->pes_type = pes_type; 699 700 if (feed->buffer_size) { 701 #ifdef NOBUFS 702 feed->buffer = NULL; 703 #else 704 feed->buffer = vmalloc(feed->buffer_size); 705 if (!feed->buffer) { 706 mutex_unlock(&demux->mutex); 707 return -ENOMEM; 708 } 709 #endif 710 } 711 712 feed->state = DMX_STATE_READY; 713 mutex_unlock(&demux->mutex); 714 715 return 0; 716 } 717 718 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed) 719 { 720 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 721 struct dvb_demux *demux = feed->demux; 722 int ret; 723 724 if (mutex_lock_interruptible(&demux->mutex)) 725 return -ERESTARTSYS; 726 727 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) { 728 mutex_unlock(&demux->mutex); 729 return -EINVAL; 730 } 731 732 if (!demux->start_feed) { 733 mutex_unlock(&demux->mutex); 734 return -ENODEV; 735 } 736 737 if ((ret = demux->start_feed(feed)) < 0) { 738 mutex_unlock(&demux->mutex); 739 return ret; 740 } 741 742 spin_lock_irq(&demux->lock); 743 ts_feed->is_filtering = 1; 744 feed->state = DMX_STATE_GO; 745 spin_unlock_irq(&demux->lock); 746 mutex_unlock(&demux->mutex); 747 748 return 0; 749 } 750 751 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed) 752 { 753 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 754 struct dvb_demux *demux = feed->demux; 755 int ret; 756 757 mutex_lock(&demux->mutex); 758 759 if (feed->state < DMX_STATE_GO) { 760 mutex_unlock(&demux->mutex); 761 return -EINVAL; 762 } 763 764 if (!demux->stop_feed) { 765 mutex_unlock(&demux->mutex); 766 return -ENODEV; 767 } 768 769 ret = demux->stop_feed(feed); 770 771 spin_lock_irq(&demux->lock); 772 ts_feed->is_filtering = 0; 773 feed->state = DMX_STATE_ALLOCATED; 774 spin_unlock_irq(&demux->lock); 775 mutex_unlock(&demux->mutex); 776 777 return ret; 778 } 779 780 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx, 781 struct dmx_ts_feed **ts_feed, 782 dmx_ts_cb callback) 783 { 784 struct dvb_demux *demux = (struct dvb_demux *)dmx; 785 struct dvb_demux_feed *feed; 786 787 if (mutex_lock_interruptible(&demux->mutex)) 788 return -ERESTARTSYS; 789 790 if (!(feed = dvb_dmx_feed_alloc(demux))) { 791 mutex_unlock(&demux->mutex); 792 return -EBUSY; 793 } 794 795 feed->type = DMX_TYPE_TS; 796 feed->cb.ts = callback; 797 feed->demux = demux; 798 feed->pid = 0xffff; 799 feed->peslen = 0xfffa; 800 feed->buffer = NULL; 801 802 (*ts_feed) = &feed->feed.ts; 803 (*ts_feed)->parent = dmx; 804 (*ts_feed)->priv = NULL; 805 (*ts_feed)->is_filtering = 0; 806 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering; 807 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering; 808 (*ts_feed)->set = dmx_ts_feed_set; 809 810 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) { 811 feed->state = DMX_STATE_FREE; 812 mutex_unlock(&demux->mutex); 813 return -EBUSY; 814 } 815 816 feed->filter->type = DMX_TYPE_TS; 817 feed->filter->feed = feed; 818 feed->filter->state = DMX_STATE_READY; 819 820 mutex_unlock(&demux->mutex); 821 822 return 0; 823 } 824 825 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, 826 struct dmx_ts_feed *ts_feed) 827 { 828 struct dvb_demux *demux = (struct dvb_demux *)dmx; 829 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 830 831 mutex_lock(&demux->mutex); 832 833 if (feed->state == DMX_STATE_FREE) { 834 mutex_unlock(&demux->mutex); 835 return -EINVAL; 836 } 837 #ifndef NOBUFS 838 vfree(feed->buffer); 839 feed->buffer = NULL; 840 #endif 841 842 feed->state = DMX_STATE_FREE; 843 feed->filter->state = DMX_STATE_FREE; 844 845 dvb_demux_feed_del(feed); 846 847 feed->pid = 0xffff; 848 849 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER) 850 demux->pesfilter[feed->pes_type] = NULL; 851 852 mutex_unlock(&demux->mutex); 853 return 0; 854 } 855 856 /****************************************************************************** 857 * dmx_section_feed API calls 858 ******************************************************************************/ 859 860 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed, 861 struct dmx_section_filter **filter) 862 { 863 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 864 struct dvb_demux *dvbdemux = dvbdmxfeed->demux; 865 struct dvb_demux_filter *dvbdmxfilter; 866 867 if (mutex_lock_interruptible(&dvbdemux->mutex)) 868 return -ERESTARTSYS; 869 870 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux); 871 if (!dvbdmxfilter) { 872 mutex_unlock(&dvbdemux->mutex); 873 return -EBUSY; 874 } 875 876 spin_lock_irq(&dvbdemux->lock); 877 *filter = &dvbdmxfilter->filter; 878 (*filter)->parent = feed; 879 (*filter)->priv = NULL; 880 dvbdmxfilter->feed = dvbdmxfeed; 881 dvbdmxfilter->type = DMX_TYPE_SEC; 882 dvbdmxfilter->state = DMX_STATE_READY; 883 dvbdmxfilter->next = dvbdmxfeed->filter; 884 dvbdmxfeed->filter = dvbdmxfilter; 885 spin_unlock_irq(&dvbdemux->lock); 886 887 mutex_unlock(&dvbdemux->mutex); 888 return 0; 889 } 890 891 static int dmx_section_feed_set(struct dmx_section_feed *feed, 892 u16 pid, size_t circular_buffer_size, 893 int check_crc) 894 { 895 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 896 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 897 898 if (pid > 0x1fff) 899 return -EINVAL; 900 901 if (mutex_lock_interruptible(&dvbdmx->mutex)) 902 return -ERESTARTSYS; 903 904 dvb_demux_feed_add(dvbdmxfeed); 905 906 dvbdmxfeed->pid = pid; 907 dvbdmxfeed->buffer_size = circular_buffer_size; 908 dvbdmxfeed->feed.sec.check_crc = check_crc; 909 910 #ifdef NOBUFS 911 dvbdmxfeed->buffer = NULL; 912 #else 913 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size); 914 if (!dvbdmxfeed->buffer) { 915 mutex_unlock(&dvbdmx->mutex); 916 return -ENOMEM; 917 } 918 #endif 919 920 dvbdmxfeed->state = DMX_STATE_READY; 921 mutex_unlock(&dvbdmx->mutex); 922 return 0; 923 } 924 925 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed) 926 { 927 int i; 928 struct dvb_demux_filter *f; 929 struct dmx_section_filter *sf; 930 u8 mask, mode, doneq; 931 932 if (!(f = dvbdmxfeed->filter)) 933 return; 934 do { 935 sf = &f->filter; 936 doneq = 0; 937 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 938 mode = sf->filter_mode[i]; 939 mask = sf->filter_mask[i]; 940 f->maskandmode[i] = mask & mode; 941 doneq |= f->maskandnotmode[i] = mask & ~mode; 942 } 943 f->doneq = doneq ? 1 : 0; 944 } while ((f = f->next)); 945 } 946 947 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed) 948 { 949 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 950 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 951 int ret; 952 953 if (mutex_lock_interruptible(&dvbdmx->mutex)) 954 return -ERESTARTSYS; 955 956 if (feed->is_filtering) { 957 mutex_unlock(&dvbdmx->mutex); 958 return -EBUSY; 959 } 960 961 if (!dvbdmxfeed->filter) { 962 mutex_unlock(&dvbdmx->mutex); 963 return -EINVAL; 964 } 965 966 dvbdmxfeed->feed.sec.tsfeedp = 0; 967 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 968 dvbdmxfeed->feed.sec.secbufp = 0; 969 dvbdmxfeed->feed.sec.seclen = 0; 970 971 if (!dvbdmx->start_feed) { 972 mutex_unlock(&dvbdmx->mutex); 973 return -ENODEV; 974 } 975 976 prepare_secfilters(dvbdmxfeed); 977 978 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) { 979 mutex_unlock(&dvbdmx->mutex); 980 return ret; 981 } 982 983 spin_lock_irq(&dvbdmx->lock); 984 feed->is_filtering = 1; 985 dvbdmxfeed->state = DMX_STATE_GO; 986 spin_unlock_irq(&dvbdmx->lock); 987 988 mutex_unlock(&dvbdmx->mutex); 989 return 0; 990 } 991 992 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed) 993 { 994 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 995 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 996 int ret; 997 998 mutex_lock(&dvbdmx->mutex); 999 1000 if (!dvbdmx->stop_feed) { 1001 mutex_unlock(&dvbdmx->mutex); 1002 return -ENODEV; 1003 } 1004 1005 ret = dvbdmx->stop_feed(dvbdmxfeed); 1006 1007 spin_lock_irq(&dvbdmx->lock); 1008 dvbdmxfeed->state = DMX_STATE_READY; 1009 feed->is_filtering = 0; 1010 spin_unlock_irq(&dvbdmx->lock); 1011 1012 mutex_unlock(&dvbdmx->mutex); 1013 return ret; 1014 } 1015 1016 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed, 1017 struct dmx_section_filter *filter) 1018 { 1019 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f; 1020 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1021 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1022 1023 mutex_lock(&dvbdmx->mutex); 1024 1025 if (dvbdmxfilter->feed != dvbdmxfeed) { 1026 mutex_unlock(&dvbdmx->mutex); 1027 return -EINVAL; 1028 } 1029 1030 if (feed->is_filtering) 1031 feed->stop_filtering(feed); 1032 1033 spin_lock_irq(&dvbdmx->lock); 1034 f = dvbdmxfeed->filter; 1035 1036 if (f == dvbdmxfilter) { 1037 dvbdmxfeed->filter = dvbdmxfilter->next; 1038 } else { 1039 while (f->next != dvbdmxfilter) 1040 f = f->next; 1041 f->next = f->next->next; 1042 } 1043 1044 dvbdmxfilter->state = DMX_STATE_FREE; 1045 spin_unlock_irq(&dvbdmx->lock); 1046 mutex_unlock(&dvbdmx->mutex); 1047 return 0; 1048 } 1049 1050 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux, 1051 struct dmx_section_feed **feed, 1052 dmx_section_cb callback) 1053 { 1054 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1055 struct dvb_demux_feed *dvbdmxfeed; 1056 1057 if (mutex_lock_interruptible(&dvbdmx->mutex)) 1058 return -ERESTARTSYS; 1059 1060 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) { 1061 mutex_unlock(&dvbdmx->mutex); 1062 return -EBUSY; 1063 } 1064 1065 dvbdmxfeed->type = DMX_TYPE_SEC; 1066 dvbdmxfeed->cb.sec = callback; 1067 dvbdmxfeed->demux = dvbdmx; 1068 dvbdmxfeed->pid = 0xffff; 1069 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 1070 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0; 1071 dvbdmxfeed->feed.sec.tsfeedp = 0; 1072 dvbdmxfeed->filter = NULL; 1073 dvbdmxfeed->buffer = NULL; 1074 1075 (*feed) = &dvbdmxfeed->feed.sec; 1076 (*feed)->is_filtering = 0; 1077 (*feed)->parent = demux; 1078 (*feed)->priv = NULL; 1079 1080 (*feed)->set = dmx_section_feed_set; 1081 (*feed)->allocate_filter = dmx_section_feed_allocate_filter; 1082 (*feed)->start_filtering = dmx_section_feed_start_filtering; 1083 (*feed)->stop_filtering = dmx_section_feed_stop_filtering; 1084 (*feed)->release_filter = dmx_section_feed_release_filter; 1085 1086 mutex_unlock(&dvbdmx->mutex); 1087 return 0; 1088 } 1089 1090 static int dvbdmx_release_section_feed(struct dmx_demux *demux, 1091 struct dmx_section_feed *feed) 1092 { 1093 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1094 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1095 1096 mutex_lock(&dvbdmx->mutex); 1097 1098 if (dvbdmxfeed->state == DMX_STATE_FREE) { 1099 mutex_unlock(&dvbdmx->mutex); 1100 return -EINVAL; 1101 } 1102 #ifndef NOBUFS 1103 vfree(dvbdmxfeed->buffer); 1104 dvbdmxfeed->buffer = NULL; 1105 #endif 1106 dvbdmxfeed->state = DMX_STATE_FREE; 1107 1108 dvb_demux_feed_del(dvbdmxfeed); 1109 1110 dvbdmxfeed->pid = 0xffff; 1111 1112 mutex_unlock(&dvbdmx->mutex); 1113 return 0; 1114 } 1115 1116 /****************************************************************************** 1117 * dvb_demux kernel data API calls 1118 ******************************************************************************/ 1119 1120 static int dvbdmx_open(struct dmx_demux *demux) 1121 { 1122 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1123 1124 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS) 1125 return -EUSERS; 1126 1127 dvbdemux->users++; 1128 return 0; 1129 } 1130 1131 static int dvbdmx_close(struct dmx_demux *demux) 1132 { 1133 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1134 1135 if (dvbdemux->users == 0) 1136 return -ENODEV; 1137 1138 dvbdemux->users--; 1139 //FIXME: release any unneeded resources if users==0 1140 return 0; 1141 } 1142 1143 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count) 1144 { 1145 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1146 void *p; 1147 1148 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE)) 1149 return -EINVAL; 1150 1151 p = memdup_user(buf, count); 1152 if (IS_ERR(p)) 1153 return PTR_ERR(p); 1154 if (mutex_lock_interruptible(&dvbdemux->mutex)) { 1155 kfree(p); 1156 return -ERESTARTSYS; 1157 } 1158 dvb_dmx_swfilter(dvbdemux, p, count); 1159 kfree(p); 1160 mutex_unlock(&dvbdemux->mutex); 1161 1162 if (signal_pending(current)) 1163 return -EINTR; 1164 return count; 1165 } 1166 1167 static int dvbdmx_add_frontend(struct dmx_demux *demux, 1168 struct dmx_frontend *frontend) 1169 { 1170 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1171 struct list_head *head = &dvbdemux->frontend_list; 1172 1173 list_add(&(frontend->connectivity_list), head); 1174 1175 return 0; 1176 } 1177 1178 static int dvbdmx_remove_frontend(struct dmx_demux *demux, 1179 struct dmx_frontend *frontend) 1180 { 1181 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1182 struct list_head *pos, *n, *head = &dvbdemux->frontend_list; 1183 1184 list_for_each_safe(pos, n, head) { 1185 if (DMX_FE_ENTRY(pos) == frontend) { 1186 list_del(pos); 1187 return 0; 1188 } 1189 } 1190 1191 return -ENODEV; 1192 } 1193 1194 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux) 1195 { 1196 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1197 1198 if (list_empty(&dvbdemux->frontend_list)) 1199 return NULL; 1200 1201 return &dvbdemux->frontend_list; 1202 } 1203 1204 static int dvbdmx_connect_frontend(struct dmx_demux *demux, 1205 struct dmx_frontend *frontend) 1206 { 1207 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1208 1209 if (demux->frontend) 1210 return -EINVAL; 1211 1212 mutex_lock(&dvbdemux->mutex); 1213 1214 demux->frontend = frontend; 1215 mutex_unlock(&dvbdemux->mutex); 1216 return 0; 1217 } 1218 1219 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux) 1220 { 1221 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1222 1223 mutex_lock(&dvbdemux->mutex); 1224 1225 demux->frontend = NULL; 1226 mutex_unlock(&dvbdemux->mutex); 1227 return 0; 1228 } 1229 1230 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids) 1231 { 1232 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1233 1234 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16)); 1235 return 0; 1236 } 1237 1238 int dvb_dmx_init(struct dvb_demux *dvbdemux) 1239 { 1240 int i; 1241 struct dmx_demux *dmx = &dvbdemux->dmx; 1242 1243 dvbdemux->cnt_storage = NULL; 1244 dvbdemux->users = 0; 1245 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter)); 1246 1247 if (!dvbdemux->filter) 1248 return -ENOMEM; 1249 1250 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed)); 1251 if (!dvbdemux->feed) { 1252 vfree(dvbdemux->filter); 1253 dvbdemux->filter = NULL; 1254 return -ENOMEM; 1255 } 1256 for (i = 0; i < dvbdemux->filternum; i++) { 1257 dvbdemux->filter[i].state = DMX_STATE_FREE; 1258 dvbdemux->filter[i].index = i; 1259 } 1260 for (i = 0; i < dvbdemux->feednum; i++) { 1261 dvbdemux->feed[i].state = DMX_STATE_FREE; 1262 dvbdemux->feed[i].index = i; 1263 } 1264 1265 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1); 1266 if (!dvbdemux->cnt_storage) 1267 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n"); 1268 1269 INIT_LIST_HEAD(&dvbdemux->frontend_list); 1270 1271 for (i = 0; i < DMX_PES_OTHER; i++) { 1272 dvbdemux->pesfilter[i] = NULL; 1273 dvbdemux->pids[i] = 0xffff; 1274 } 1275 1276 INIT_LIST_HEAD(&dvbdemux->feed_list); 1277 1278 dvbdemux->playing = 0; 1279 dvbdemux->recording = 0; 1280 dvbdemux->tsbufp = 0; 1281 1282 if (!dvbdemux->check_crc32) 1283 dvbdemux->check_crc32 = dvb_dmx_crc32; 1284 1285 if (!dvbdemux->memcopy) 1286 dvbdemux->memcopy = dvb_dmx_memcopy; 1287 1288 dmx->frontend = NULL; 1289 dmx->priv = dvbdemux; 1290 dmx->open = dvbdmx_open; 1291 dmx->close = dvbdmx_close; 1292 dmx->write = dvbdmx_write; 1293 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed; 1294 dmx->release_ts_feed = dvbdmx_release_ts_feed; 1295 dmx->allocate_section_feed = dvbdmx_allocate_section_feed; 1296 dmx->release_section_feed = dvbdmx_release_section_feed; 1297 1298 dmx->add_frontend = dvbdmx_add_frontend; 1299 dmx->remove_frontend = dvbdmx_remove_frontend; 1300 dmx->get_frontends = dvbdmx_get_frontends; 1301 dmx->connect_frontend = dvbdmx_connect_frontend; 1302 dmx->disconnect_frontend = dvbdmx_disconnect_frontend; 1303 dmx->get_pes_pids = dvbdmx_get_pes_pids; 1304 1305 mutex_init(&dvbdemux->mutex); 1306 spin_lock_init(&dvbdemux->lock); 1307 1308 return 0; 1309 } 1310 1311 EXPORT_SYMBOL(dvb_dmx_init); 1312 1313 void dvb_dmx_release(struct dvb_demux *dvbdemux) 1314 { 1315 vfree(dvbdemux->cnt_storage); 1316 vfree(dvbdemux->filter); 1317 vfree(dvbdemux->feed); 1318 } 1319 1320 EXPORT_SYMBOL(dvb_dmx_release); 1321