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); 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); 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 } 372 if (feed->ts_type & TS_DECODER) 373 if (feed->demux->write_to_decoder) 374 feed->demux->write_to_decoder(feed, buf, 188); 375 break; 376 377 case DMX_TYPE_SEC: 378 if (!feed->feed.sec.is_filtering) 379 break; 380 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0) 381 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0; 382 break; 383 384 default: 385 break; 386 } 387 } 388 389 #define DVR_FEED(f) \ 390 (((f)->type == DMX_TYPE_TS) && \ 391 ((f)->feed.ts.is_filtering) && \ 392 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET)) 393 394 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf) 395 { 396 struct dvb_demux_feed *feed; 397 u16 pid = ts_pid(buf); 398 int dvr_done = 0; 399 400 if (dvb_demux_speedcheck) { 401 ktime_t cur_time; 402 u64 speed_bytes, speed_timedelta; 403 404 demux->speed_pkts_cnt++; 405 406 /* show speed every SPEED_PKTS_INTERVAL packets */ 407 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) { 408 cur_time = ktime_get(); 409 410 if (ktime_to_ns(demux->speed_last_time) != 0) { 411 speed_bytes = (u64)demux->speed_pkts_cnt 412 * 188 * 8; 413 /* convert to 1024 basis */ 414 speed_bytes = 1000 * div64_u64(speed_bytes, 415 1024); 416 speed_timedelta = ktime_ms_delta(cur_time, 417 demux->speed_last_time); 418 printk(KERN_INFO "TS speed %llu Kbits/sec \n", 419 div64_u64(speed_bytes, 420 speed_timedelta)); 421 } 422 423 demux->speed_last_time = cur_time; 424 demux->speed_pkts_cnt = 0; 425 } 426 } 427 428 if (buf[1] & 0x80) { 429 dprintk_tscheck("TEI detected. " 430 "PID=0x%x data1=0x%x\n", 431 pid, buf[1]); 432 /* data in this packet can't be trusted - drop it unless 433 * module option dvb_demux_feed_err_pkts is set */ 434 if (!dvb_demux_feed_err_pkts) 435 return; 436 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */ 437 if (demux->cnt_storage && dvb_demux_tscheck) { 438 /* check pkt counter */ 439 if (pid < MAX_PID) { 440 if (buf[3] & 0x10) 441 demux->cnt_storage[pid] = 442 (demux->cnt_storage[pid] + 1) & 0xf; 443 444 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) { 445 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n", 446 pid, demux->cnt_storage[pid], 447 buf[3] & 0xf); 448 demux->cnt_storage[pid] = buf[3] & 0xf; 449 } 450 } 451 /* end check */ 452 } 453 454 list_for_each_entry(feed, &demux->feed_list, list_head) { 455 if ((feed->pid != pid) && (feed->pid != 0x2000)) 456 continue; 457 458 /* copy each packet only once to the dvr device, even 459 * if a PID is in multiple filters (e.g. video + PCR) */ 460 if ((DVR_FEED(feed)) && (dvr_done++)) 461 continue; 462 463 if (feed->pid == pid) 464 dvb_dmx_swfilter_packet_type(feed, buf); 465 else if (feed->pid == 0x2000) 466 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts); 467 } 468 } 469 470 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, 471 size_t count) 472 { 473 unsigned long flags; 474 475 spin_lock_irqsave(&demux->lock, flags); 476 477 while (count--) { 478 if (buf[0] == 0x47) 479 dvb_dmx_swfilter_packet(demux, buf); 480 buf += 188; 481 } 482 483 spin_unlock_irqrestore(&demux->lock, flags); 484 } 485 486 EXPORT_SYMBOL(dvb_dmx_swfilter_packets); 487 488 static inline int find_next_packet(const u8 *buf, int pos, size_t count, 489 const int pktsize) 490 { 491 int start = pos, lost; 492 493 while (pos < count) { 494 if (buf[pos] == 0x47 || 495 (pktsize == 204 && buf[pos] == 0xB8)) 496 break; 497 pos++; 498 } 499 500 lost = pos - start; 501 if (lost) { 502 /* This garbage is part of a valid packet? */ 503 int backtrack = pos - pktsize; 504 if (backtrack >= 0 && (buf[backtrack] == 0x47 || 505 (pktsize == 204 && buf[backtrack] == 0xB8))) 506 return backtrack; 507 } 508 509 return pos; 510 } 511 512 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */ 513 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, 514 size_t count, const int pktsize) 515 { 516 int p = 0, i, j; 517 const u8 *q; 518 unsigned long flags; 519 520 spin_lock_irqsave(&demux->lock, flags); 521 522 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */ 523 i = demux->tsbufp; 524 j = pktsize - i; 525 if (count < j) { 526 memcpy(&demux->tsbuf[i], buf, count); 527 demux->tsbufp += count; 528 goto bailout; 529 } 530 memcpy(&demux->tsbuf[i], buf, j); 531 if (demux->tsbuf[0] == 0x47) /* double check */ 532 dvb_dmx_swfilter_packet(demux, demux->tsbuf); 533 demux->tsbufp = 0; 534 p += j; 535 } 536 537 while (1) { 538 p = find_next_packet(buf, p, count, pktsize); 539 if (p >= count) 540 break; 541 if (count - p < pktsize) 542 break; 543 544 q = &buf[p]; 545 546 if (pktsize == 204 && (*q == 0xB8)) { 547 memcpy(demux->tsbuf, q, 188); 548 demux->tsbuf[0] = 0x47; 549 q = demux->tsbuf; 550 } 551 dvb_dmx_swfilter_packet(demux, q); 552 p += pktsize; 553 } 554 555 i = count - p; 556 if (i) { 557 memcpy(demux->tsbuf, &buf[p], i); 558 demux->tsbufp = i; 559 if (pktsize == 204 && demux->tsbuf[0] == 0xB8) 560 demux->tsbuf[0] = 0x47; 561 } 562 563 bailout: 564 spin_unlock_irqrestore(&demux->lock, flags); 565 } 566 567 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count) 568 { 569 _dvb_dmx_swfilter(demux, buf, count, 188); 570 } 571 EXPORT_SYMBOL(dvb_dmx_swfilter); 572 573 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count) 574 { 575 _dvb_dmx_swfilter(demux, buf, count, 204); 576 } 577 EXPORT_SYMBOL(dvb_dmx_swfilter_204); 578 579 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count) 580 { 581 unsigned long flags; 582 583 spin_lock_irqsave(&demux->lock, flags); 584 585 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts); 586 587 spin_unlock_irqrestore(&demux->lock, flags); 588 } 589 EXPORT_SYMBOL(dvb_dmx_swfilter_raw); 590 591 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux) 592 { 593 int i; 594 595 for (i = 0; i < demux->filternum; i++) 596 if (demux->filter[i].state == DMX_STATE_FREE) 597 break; 598 599 if (i == demux->filternum) 600 return NULL; 601 602 demux->filter[i].state = DMX_STATE_ALLOCATED; 603 604 return &demux->filter[i]; 605 } 606 607 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux) 608 { 609 int i; 610 611 for (i = 0; i < demux->feednum; i++) 612 if (demux->feed[i].state == DMX_STATE_FREE) 613 break; 614 615 if (i == demux->feednum) 616 return NULL; 617 618 demux->feed[i].state = DMX_STATE_ALLOCATED; 619 620 return &demux->feed[i]; 621 } 622 623 static int dvb_demux_feed_find(struct dvb_demux_feed *feed) 624 { 625 struct dvb_demux_feed *entry; 626 627 list_for_each_entry(entry, &feed->demux->feed_list, list_head) 628 if (entry == feed) 629 return 1; 630 631 return 0; 632 } 633 634 static void dvb_demux_feed_add(struct dvb_demux_feed *feed) 635 { 636 spin_lock_irq(&feed->demux->lock); 637 if (dvb_demux_feed_find(feed)) { 638 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n", 639 __func__, feed->type, feed->state, feed->pid); 640 goto out; 641 } 642 643 list_add(&feed->list_head, &feed->demux->feed_list); 644 out: 645 spin_unlock_irq(&feed->demux->lock); 646 } 647 648 static void dvb_demux_feed_del(struct dvb_demux_feed *feed) 649 { 650 spin_lock_irq(&feed->demux->lock); 651 if (!(dvb_demux_feed_find(feed))) { 652 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n", 653 __func__, feed->type, feed->state, feed->pid); 654 goto out; 655 } 656 657 list_del(&feed->list_head); 658 out: 659 spin_unlock_irq(&feed->demux->lock); 660 } 661 662 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type, 663 enum dmx_ts_pes pes_type, 664 size_t circular_buffer_size, ktime_t timeout) 665 { 666 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 667 struct dvb_demux *demux = feed->demux; 668 669 if (pid > DMX_MAX_PID) 670 return -EINVAL; 671 672 if (mutex_lock_interruptible(&demux->mutex)) 673 return -ERESTARTSYS; 674 675 if (ts_type & TS_DECODER) { 676 if (pes_type >= DMX_PES_OTHER) { 677 mutex_unlock(&demux->mutex); 678 return -EINVAL; 679 } 680 681 if (demux->pesfilter[pes_type] && 682 demux->pesfilter[pes_type] != feed) { 683 mutex_unlock(&demux->mutex); 684 return -EINVAL; 685 } 686 687 demux->pesfilter[pes_type] = feed; 688 demux->pids[pes_type] = pid; 689 } 690 691 dvb_demux_feed_add(feed); 692 693 feed->pid = pid; 694 feed->buffer_size = circular_buffer_size; 695 feed->timeout = timeout; 696 feed->ts_type = ts_type; 697 feed->pes_type = pes_type; 698 699 if (feed->buffer_size) { 700 #ifdef NOBUFS 701 feed->buffer = NULL; 702 #else 703 feed->buffer = vmalloc(feed->buffer_size); 704 if (!feed->buffer) { 705 mutex_unlock(&demux->mutex); 706 return -ENOMEM; 707 } 708 #endif 709 } 710 711 feed->state = DMX_STATE_READY; 712 mutex_unlock(&demux->mutex); 713 714 return 0; 715 } 716 717 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed) 718 { 719 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 720 struct dvb_demux *demux = feed->demux; 721 int ret; 722 723 if (mutex_lock_interruptible(&demux->mutex)) 724 return -ERESTARTSYS; 725 726 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) { 727 mutex_unlock(&demux->mutex); 728 return -EINVAL; 729 } 730 731 if (!demux->start_feed) { 732 mutex_unlock(&demux->mutex); 733 return -ENODEV; 734 } 735 736 if ((ret = demux->start_feed(feed)) < 0) { 737 mutex_unlock(&demux->mutex); 738 return ret; 739 } 740 741 spin_lock_irq(&demux->lock); 742 ts_feed->is_filtering = 1; 743 feed->state = DMX_STATE_GO; 744 spin_unlock_irq(&demux->lock); 745 mutex_unlock(&demux->mutex); 746 747 return 0; 748 } 749 750 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed) 751 { 752 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 753 struct dvb_demux *demux = feed->demux; 754 int ret; 755 756 mutex_lock(&demux->mutex); 757 758 if (feed->state < DMX_STATE_GO) { 759 mutex_unlock(&demux->mutex); 760 return -EINVAL; 761 } 762 763 if (!demux->stop_feed) { 764 mutex_unlock(&demux->mutex); 765 return -ENODEV; 766 } 767 768 ret = demux->stop_feed(feed); 769 770 spin_lock_irq(&demux->lock); 771 ts_feed->is_filtering = 0; 772 feed->state = DMX_STATE_ALLOCATED; 773 spin_unlock_irq(&demux->lock); 774 mutex_unlock(&demux->mutex); 775 776 return ret; 777 } 778 779 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx, 780 struct dmx_ts_feed **ts_feed, 781 dmx_ts_cb callback) 782 { 783 struct dvb_demux *demux = (struct dvb_demux *)dmx; 784 struct dvb_demux_feed *feed; 785 786 if (mutex_lock_interruptible(&demux->mutex)) 787 return -ERESTARTSYS; 788 789 if (!(feed = dvb_dmx_feed_alloc(demux))) { 790 mutex_unlock(&demux->mutex); 791 return -EBUSY; 792 } 793 794 feed->type = DMX_TYPE_TS; 795 feed->cb.ts = callback; 796 feed->demux = demux; 797 feed->pid = 0xffff; 798 feed->peslen = 0xfffa; 799 feed->buffer = NULL; 800 801 (*ts_feed) = &feed->feed.ts; 802 (*ts_feed)->parent = dmx; 803 (*ts_feed)->priv = NULL; 804 (*ts_feed)->is_filtering = 0; 805 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering; 806 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering; 807 (*ts_feed)->set = dmx_ts_feed_set; 808 809 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) { 810 feed->state = DMX_STATE_FREE; 811 mutex_unlock(&demux->mutex); 812 return -EBUSY; 813 } 814 815 feed->filter->type = DMX_TYPE_TS; 816 feed->filter->feed = feed; 817 feed->filter->state = DMX_STATE_READY; 818 819 mutex_unlock(&demux->mutex); 820 821 return 0; 822 } 823 824 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, 825 struct dmx_ts_feed *ts_feed) 826 { 827 struct dvb_demux *demux = (struct dvb_demux *)dmx; 828 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 829 830 mutex_lock(&demux->mutex); 831 832 if (feed->state == DMX_STATE_FREE) { 833 mutex_unlock(&demux->mutex); 834 return -EINVAL; 835 } 836 #ifndef NOBUFS 837 vfree(feed->buffer); 838 feed->buffer = NULL; 839 #endif 840 841 feed->state = DMX_STATE_FREE; 842 feed->filter->state = DMX_STATE_FREE; 843 844 dvb_demux_feed_del(feed); 845 846 feed->pid = 0xffff; 847 848 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER) 849 demux->pesfilter[feed->pes_type] = NULL; 850 851 mutex_unlock(&demux->mutex); 852 return 0; 853 } 854 855 /****************************************************************************** 856 * dmx_section_feed API calls 857 ******************************************************************************/ 858 859 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed, 860 struct dmx_section_filter **filter) 861 { 862 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 863 struct dvb_demux *dvbdemux = dvbdmxfeed->demux; 864 struct dvb_demux_filter *dvbdmxfilter; 865 866 if (mutex_lock_interruptible(&dvbdemux->mutex)) 867 return -ERESTARTSYS; 868 869 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux); 870 if (!dvbdmxfilter) { 871 mutex_unlock(&dvbdemux->mutex); 872 return -EBUSY; 873 } 874 875 spin_lock_irq(&dvbdemux->lock); 876 *filter = &dvbdmxfilter->filter; 877 (*filter)->parent = feed; 878 (*filter)->priv = NULL; 879 dvbdmxfilter->feed = dvbdmxfeed; 880 dvbdmxfilter->type = DMX_TYPE_SEC; 881 dvbdmxfilter->state = DMX_STATE_READY; 882 dvbdmxfilter->next = dvbdmxfeed->filter; 883 dvbdmxfeed->filter = dvbdmxfilter; 884 spin_unlock_irq(&dvbdemux->lock); 885 886 mutex_unlock(&dvbdemux->mutex); 887 return 0; 888 } 889 890 static int dmx_section_feed_set(struct dmx_section_feed *feed, 891 u16 pid, size_t circular_buffer_size, 892 int check_crc) 893 { 894 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 895 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 896 897 if (pid > 0x1fff) 898 return -EINVAL; 899 900 if (mutex_lock_interruptible(&dvbdmx->mutex)) 901 return -ERESTARTSYS; 902 903 dvb_demux_feed_add(dvbdmxfeed); 904 905 dvbdmxfeed->pid = pid; 906 dvbdmxfeed->buffer_size = circular_buffer_size; 907 dvbdmxfeed->feed.sec.check_crc = check_crc; 908 909 #ifdef NOBUFS 910 dvbdmxfeed->buffer = NULL; 911 #else 912 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size); 913 if (!dvbdmxfeed->buffer) { 914 mutex_unlock(&dvbdmx->mutex); 915 return -ENOMEM; 916 } 917 #endif 918 919 dvbdmxfeed->state = DMX_STATE_READY; 920 mutex_unlock(&dvbdmx->mutex); 921 return 0; 922 } 923 924 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed) 925 { 926 int i; 927 struct dvb_demux_filter *f; 928 struct dmx_section_filter *sf; 929 u8 mask, mode, doneq; 930 931 if (!(f = dvbdmxfeed->filter)) 932 return; 933 do { 934 sf = &f->filter; 935 doneq = 0; 936 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 937 mode = sf->filter_mode[i]; 938 mask = sf->filter_mask[i]; 939 f->maskandmode[i] = mask & mode; 940 doneq |= f->maskandnotmode[i] = mask & ~mode; 941 } 942 f->doneq = doneq ? 1 : 0; 943 } while ((f = f->next)); 944 } 945 946 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed) 947 { 948 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 949 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 950 int ret; 951 952 if (mutex_lock_interruptible(&dvbdmx->mutex)) 953 return -ERESTARTSYS; 954 955 if (feed->is_filtering) { 956 mutex_unlock(&dvbdmx->mutex); 957 return -EBUSY; 958 } 959 960 if (!dvbdmxfeed->filter) { 961 mutex_unlock(&dvbdmx->mutex); 962 return -EINVAL; 963 } 964 965 dvbdmxfeed->feed.sec.tsfeedp = 0; 966 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 967 dvbdmxfeed->feed.sec.secbufp = 0; 968 dvbdmxfeed->feed.sec.seclen = 0; 969 970 if (!dvbdmx->start_feed) { 971 mutex_unlock(&dvbdmx->mutex); 972 return -ENODEV; 973 } 974 975 prepare_secfilters(dvbdmxfeed); 976 977 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) { 978 mutex_unlock(&dvbdmx->mutex); 979 return ret; 980 } 981 982 spin_lock_irq(&dvbdmx->lock); 983 feed->is_filtering = 1; 984 dvbdmxfeed->state = DMX_STATE_GO; 985 spin_unlock_irq(&dvbdmx->lock); 986 987 mutex_unlock(&dvbdmx->mutex); 988 return 0; 989 } 990 991 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed) 992 { 993 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 994 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 995 int ret; 996 997 mutex_lock(&dvbdmx->mutex); 998 999 if (!dvbdmx->stop_feed) { 1000 mutex_unlock(&dvbdmx->mutex); 1001 return -ENODEV; 1002 } 1003 1004 ret = dvbdmx->stop_feed(dvbdmxfeed); 1005 1006 spin_lock_irq(&dvbdmx->lock); 1007 dvbdmxfeed->state = DMX_STATE_READY; 1008 feed->is_filtering = 0; 1009 spin_unlock_irq(&dvbdmx->lock); 1010 1011 mutex_unlock(&dvbdmx->mutex); 1012 return ret; 1013 } 1014 1015 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed, 1016 struct dmx_section_filter *filter) 1017 { 1018 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f; 1019 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1020 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1021 1022 mutex_lock(&dvbdmx->mutex); 1023 1024 if (dvbdmxfilter->feed != dvbdmxfeed) { 1025 mutex_unlock(&dvbdmx->mutex); 1026 return -EINVAL; 1027 } 1028 1029 if (feed->is_filtering) { 1030 /* release dvbdmx->mutex as far as it is 1031 acquired by stop_filtering() itself */ 1032 mutex_unlock(&dvbdmx->mutex); 1033 feed->stop_filtering(feed); 1034 mutex_lock(&dvbdmx->mutex); 1035 } 1036 1037 spin_lock_irq(&dvbdmx->lock); 1038 f = dvbdmxfeed->filter; 1039 1040 if (f == dvbdmxfilter) { 1041 dvbdmxfeed->filter = dvbdmxfilter->next; 1042 } else { 1043 while (f->next != dvbdmxfilter) 1044 f = f->next; 1045 f->next = f->next->next; 1046 } 1047 1048 dvbdmxfilter->state = DMX_STATE_FREE; 1049 spin_unlock_irq(&dvbdmx->lock); 1050 mutex_unlock(&dvbdmx->mutex); 1051 return 0; 1052 } 1053 1054 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux, 1055 struct dmx_section_feed **feed, 1056 dmx_section_cb callback) 1057 { 1058 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1059 struct dvb_demux_feed *dvbdmxfeed; 1060 1061 if (mutex_lock_interruptible(&dvbdmx->mutex)) 1062 return -ERESTARTSYS; 1063 1064 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) { 1065 mutex_unlock(&dvbdmx->mutex); 1066 return -EBUSY; 1067 } 1068 1069 dvbdmxfeed->type = DMX_TYPE_SEC; 1070 dvbdmxfeed->cb.sec = callback; 1071 dvbdmxfeed->demux = dvbdmx; 1072 dvbdmxfeed->pid = 0xffff; 1073 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 1074 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0; 1075 dvbdmxfeed->feed.sec.tsfeedp = 0; 1076 dvbdmxfeed->filter = NULL; 1077 dvbdmxfeed->buffer = NULL; 1078 1079 (*feed) = &dvbdmxfeed->feed.sec; 1080 (*feed)->is_filtering = 0; 1081 (*feed)->parent = demux; 1082 (*feed)->priv = NULL; 1083 1084 (*feed)->set = dmx_section_feed_set; 1085 (*feed)->allocate_filter = dmx_section_feed_allocate_filter; 1086 (*feed)->start_filtering = dmx_section_feed_start_filtering; 1087 (*feed)->stop_filtering = dmx_section_feed_stop_filtering; 1088 (*feed)->release_filter = dmx_section_feed_release_filter; 1089 1090 mutex_unlock(&dvbdmx->mutex); 1091 return 0; 1092 } 1093 1094 static int dvbdmx_release_section_feed(struct dmx_demux *demux, 1095 struct dmx_section_feed *feed) 1096 { 1097 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1098 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1099 1100 mutex_lock(&dvbdmx->mutex); 1101 1102 if (dvbdmxfeed->state == DMX_STATE_FREE) { 1103 mutex_unlock(&dvbdmx->mutex); 1104 return -EINVAL; 1105 } 1106 #ifndef NOBUFS 1107 vfree(dvbdmxfeed->buffer); 1108 dvbdmxfeed->buffer = NULL; 1109 #endif 1110 dvbdmxfeed->state = DMX_STATE_FREE; 1111 1112 dvb_demux_feed_del(dvbdmxfeed); 1113 1114 dvbdmxfeed->pid = 0xffff; 1115 1116 mutex_unlock(&dvbdmx->mutex); 1117 return 0; 1118 } 1119 1120 /****************************************************************************** 1121 * dvb_demux kernel data API calls 1122 ******************************************************************************/ 1123 1124 static int dvbdmx_open(struct dmx_demux *demux) 1125 { 1126 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1127 1128 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS) 1129 return -EUSERS; 1130 1131 dvbdemux->users++; 1132 return 0; 1133 } 1134 1135 static int dvbdmx_close(struct dmx_demux *demux) 1136 { 1137 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1138 1139 if (dvbdemux->users == 0) 1140 return -ENODEV; 1141 1142 dvbdemux->users--; 1143 //FIXME: release any unneeded resources if users==0 1144 return 0; 1145 } 1146 1147 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count) 1148 { 1149 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1150 void *p; 1151 1152 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE)) 1153 return -EINVAL; 1154 1155 p = memdup_user(buf, count); 1156 if (IS_ERR(p)) 1157 return PTR_ERR(p); 1158 if (mutex_lock_interruptible(&dvbdemux->mutex)) { 1159 kfree(p); 1160 return -ERESTARTSYS; 1161 } 1162 dvb_dmx_swfilter(dvbdemux, p, count); 1163 kfree(p); 1164 mutex_unlock(&dvbdemux->mutex); 1165 1166 if (signal_pending(current)) 1167 return -EINTR; 1168 return count; 1169 } 1170 1171 static int dvbdmx_add_frontend(struct dmx_demux *demux, 1172 struct dmx_frontend *frontend) 1173 { 1174 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1175 struct list_head *head = &dvbdemux->frontend_list; 1176 1177 list_add(&(frontend->connectivity_list), head); 1178 1179 return 0; 1180 } 1181 1182 static int dvbdmx_remove_frontend(struct dmx_demux *demux, 1183 struct dmx_frontend *frontend) 1184 { 1185 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1186 struct list_head *pos, *n, *head = &dvbdemux->frontend_list; 1187 1188 list_for_each_safe(pos, n, head) { 1189 if (DMX_FE_ENTRY(pos) == frontend) { 1190 list_del(pos); 1191 return 0; 1192 } 1193 } 1194 1195 return -ENODEV; 1196 } 1197 1198 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux) 1199 { 1200 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1201 1202 if (list_empty(&dvbdemux->frontend_list)) 1203 return NULL; 1204 1205 return &dvbdemux->frontend_list; 1206 } 1207 1208 static int dvbdmx_connect_frontend(struct dmx_demux *demux, 1209 struct dmx_frontend *frontend) 1210 { 1211 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1212 1213 if (demux->frontend) 1214 return -EINVAL; 1215 1216 mutex_lock(&dvbdemux->mutex); 1217 1218 demux->frontend = frontend; 1219 mutex_unlock(&dvbdemux->mutex); 1220 return 0; 1221 } 1222 1223 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux) 1224 { 1225 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1226 1227 mutex_lock(&dvbdemux->mutex); 1228 1229 demux->frontend = NULL; 1230 mutex_unlock(&dvbdemux->mutex); 1231 return 0; 1232 } 1233 1234 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids) 1235 { 1236 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1237 1238 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16)); 1239 return 0; 1240 } 1241 1242 int dvb_dmx_init(struct dvb_demux *dvbdemux) 1243 { 1244 int i; 1245 struct dmx_demux *dmx = &dvbdemux->dmx; 1246 1247 dvbdemux->cnt_storage = NULL; 1248 dvbdemux->users = 0; 1249 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter)); 1250 1251 if (!dvbdemux->filter) 1252 return -ENOMEM; 1253 1254 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed)); 1255 if (!dvbdemux->feed) { 1256 vfree(dvbdemux->filter); 1257 dvbdemux->filter = NULL; 1258 return -ENOMEM; 1259 } 1260 for (i = 0; i < dvbdemux->filternum; i++) { 1261 dvbdemux->filter[i].state = DMX_STATE_FREE; 1262 dvbdemux->filter[i].index = i; 1263 } 1264 for (i = 0; i < dvbdemux->feednum; i++) { 1265 dvbdemux->feed[i].state = DMX_STATE_FREE; 1266 dvbdemux->feed[i].index = i; 1267 } 1268 1269 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1); 1270 if (!dvbdemux->cnt_storage) 1271 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n"); 1272 1273 INIT_LIST_HEAD(&dvbdemux->frontend_list); 1274 1275 for (i = 0; i < DMX_PES_OTHER; i++) { 1276 dvbdemux->pesfilter[i] = NULL; 1277 dvbdemux->pids[i] = 0xffff; 1278 } 1279 1280 INIT_LIST_HEAD(&dvbdemux->feed_list); 1281 1282 dvbdemux->playing = 0; 1283 dvbdemux->recording = 0; 1284 dvbdemux->tsbufp = 0; 1285 1286 if (!dvbdemux->check_crc32) 1287 dvbdemux->check_crc32 = dvb_dmx_crc32; 1288 1289 if (!dvbdemux->memcopy) 1290 dvbdemux->memcopy = dvb_dmx_memcopy; 1291 1292 dmx->frontend = NULL; 1293 dmx->priv = dvbdemux; 1294 dmx->open = dvbdmx_open; 1295 dmx->close = dvbdmx_close; 1296 dmx->write = dvbdmx_write; 1297 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed; 1298 dmx->release_ts_feed = dvbdmx_release_ts_feed; 1299 dmx->allocate_section_feed = dvbdmx_allocate_section_feed; 1300 dmx->release_section_feed = dvbdmx_release_section_feed; 1301 1302 dmx->add_frontend = dvbdmx_add_frontend; 1303 dmx->remove_frontend = dvbdmx_remove_frontend; 1304 dmx->get_frontends = dvbdmx_get_frontends; 1305 dmx->connect_frontend = dvbdmx_connect_frontend; 1306 dmx->disconnect_frontend = dvbdmx_disconnect_frontend; 1307 dmx->get_pes_pids = dvbdmx_get_pes_pids; 1308 1309 mutex_init(&dvbdemux->mutex); 1310 spin_lock_init(&dvbdemux->lock); 1311 1312 return 0; 1313 } 1314 1315 EXPORT_SYMBOL(dvb_dmx_init); 1316 1317 void dvb_dmx_release(struct dvb_demux *dvbdemux) 1318 { 1319 vfree(dvbdemux->cnt_storage); 1320 vfree(dvbdemux->filter); 1321 vfree(dvbdemux->feed); 1322 } 1323 1324 EXPORT_SYMBOL(dvb_dmx_release); 1325