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 struct timespec cur_time, delta_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 = current_kernel_time(); 409 410 if (demux->speed_last_time.tv_sec != 0 && 411 demux->speed_last_time.tv_nsec != 0) { 412 delta_time = timespec_sub(cur_time, 413 demux->speed_last_time); 414 speed_bytes = (u64)demux->speed_pkts_cnt 415 * 188 * 8; 416 /* convert to 1024 basis */ 417 speed_bytes = 1000 * div64_u64(speed_bytes, 418 1024); 419 speed_timedelta = 420 (u64)timespec_to_ns(&delta_time); 421 speed_timedelta = div64_u64(speed_timedelta, 422 1000000); /* nsec -> usec */ 423 printk(KERN_INFO "TS speed %llu Kbits/sec \n", 424 div64_u64(speed_bytes, 425 speed_timedelta)); 426 } 427 428 demux->speed_last_time = cur_time; 429 demux->speed_pkts_cnt = 0; 430 } 431 } 432 433 if (buf[1] & 0x80) { 434 dprintk_tscheck("TEI detected. " 435 "PID=0x%x data1=0x%x\n", 436 pid, buf[1]); 437 /* data in this packet can't be trusted - drop it unless 438 * module option dvb_demux_feed_err_pkts is set */ 439 if (!dvb_demux_feed_err_pkts) 440 return; 441 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */ 442 if (demux->cnt_storage && dvb_demux_tscheck) { 443 /* check pkt counter */ 444 if (pid < MAX_PID) { 445 if (buf[3] & 0x10) 446 demux->cnt_storage[pid] = 447 (demux->cnt_storage[pid] + 1) & 0xf; 448 449 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) { 450 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n", 451 pid, demux->cnt_storage[pid], 452 buf[3] & 0xf); 453 demux->cnt_storage[pid] = buf[3] & 0xf; 454 } 455 } 456 /* end check */ 457 } 458 459 list_for_each_entry(feed, &demux->feed_list, list_head) { 460 if ((feed->pid != pid) && (feed->pid != 0x2000)) 461 continue; 462 463 /* copy each packet only once to the dvr device, even 464 * if a PID is in multiple filters (e.g. video + PCR) */ 465 if ((DVR_FEED(feed)) && (dvr_done++)) 466 continue; 467 468 if (feed->pid == pid) 469 dvb_dmx_swfilter_packet_type(feed, buf); 470 else if (feed->pid == 0x2000) 471 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts); 472 } 473 } 474 475 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, 476 size_t count) 477 { 478 unsigned long flags; 479 480 spin_lock_irqsave(&demux->lock, flags); 481 482 while (count--) { 483 if (buf[0] == 0x47) 484 dvb_dmx_swfilter_packet(demux, buf); 485 buf += 188; 486 } 487 488 spin_unlock_irqrestore(&demux->lock, flags); 489 } 490 491 EXPORT_SYMBOL(dvb_dmx_swfilter_packets); 492 493 static inline int find_next_packet(const u8 *buf, int pos, size_t count, 494 const int pktsize) 495 { 496 int start = pos, lost; 497 498 while (pos < count) { 499 if (buf[pos] == 0x47 || 500 (pktsize == 204 && buf[pos] == 0xB8)) 501 break; 502 pos++; 503 } 504 505 lost = pos - start; 506 if (lost) { 507 /* This garbage is part of a valid packet? */ 508 int backtrack = pos - pktsize; 509 if (backtrack >= 0 && (buf[backtrack] == 0x47 || 510 (pktsize == 204 && buf[backtrack] == 0xB8))) 511 return backtrack; 512 } 513 514 return pos; 515 } 516 517 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */ 518 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, 519 size_t count, const int pktsize) 520 { 521 int p = 0, i, j; 522 const u8 *q; 523 unsigned long flags; 524 525 spin_lock_irqsave(&demux->lock, flags); 526 527 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */ 528 i = demux->tsbufp; 529 j = pktsize - i; 530 if (count < j) { 531 memcpy(&demux->tsbuf[i], buf, count); 532 demux->tsbufp += count; 533 goto bailout; 534 } 535 memcpy(&demux->tsbuf[i], buf, j); 536 if (demux->tsbuf[0] == 0x47) /* double check */ 537 dvb_dmx_swfilter_packet(demux, demux->tsbuf); 538 demux->tsbufp = 0; 539 p += j; 540 } 541 542 while (1) { 543 p = find_next_packet(buf, p, count, pktsize); 544 if (p >= count) 545 break; 546 if (count - p < pktsize) 547 break; 548 549 q = &buf[p]; 550 551 if (pktsize == 204 && (*q == 0xB8)) { 552 memcpy(demux->tsbuf, q, 188); 553 demux->tsbuf[0] = 0x47; 554 q = demux->tsbuf; 555 } 556 dvb_dmx_swfilter_packet(demux, q); 557 p += pktsize; 558 } 559 560 i = count - p; 561 if (i) { 562 memcpy(demux->tsbuf, &buf[p], i); 563 demux->tsbufp = i; 564 if (pktsize == 204 && demux->tsbuf[0] == 0xB8) 565 demux->tsbuf[0] = 0x47; 566 } 567 568 bailout: 569 spin_unlock_irqrestore(&demux->lock, flags); 570 } 571 572 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count) 573 { 574 _dvb_dmx_swfilter(demux, buf, count, 188); 575 } 576 EXPORT_SYMBOL(dvb_dmx_swfilter); 577 578 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count) 579 { 580 _dvb_dmx_swfilter(demux, buf, count, 204); 581 } 582 EXPORT_SYMBOL(dvb_dmx_swfilter_204); 583 584 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count) 585 { 586 unsigned long flags; 587 588 spin_lock_irqsave(&demux->lock, flags); 589 590 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts); 591 592 spin_unlock_irqrestore(&demux->lock, flags); 593 } 594 EXPORT_SYMBOL(dvb_dmx_swfilter_raw); 595 596 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux) 597 { 598 int i; 599 600 for (i = 0; i < demux->filternum; i++) 601 if (demux->filter[i].state == DMX_STATE_FREE) 602 break; 603 604 if (i == demux->filternum) 605 return NULL; 606 607 demux->filter[i].state = DMX_STATE_ALLOCATED; 608 609 return &demux->filter[i]; 610 } 611 612 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux) 613 { 614 int i; 615 616 for (i = 0; i < demux->feednum; i++) 617 if (demux->feed[i].state == DMX_STATE_FREE) 618 break; 619 620 if (i == demux->feednum) 621 return NULL; 622 623 demux->feed[i].state = DMX_STATE_ALLOCATED; 624 625 return &demux->feed[i]; 626 } 627 628 static int dvb_demux_feed_find(struct dvb_demux_feed *feed) 629 { 630 struct dvb_demux_feed *entry; 631 632 list_for_each_entry(entry, &feed->demux->feed_list, list_head) 633 if (entry == feed) 634 return 1; 635 636 return 0; 637 } 638 639 static void dvb_demux_feed_add(struct dvb_demux_feed *feed) 640 { 641 spin_lock_irq(&feed->demux->lock); 642 if (dvb_demux_feed_find(feed)) { 643 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n", 644 __func__, feed->type, feed->state, feed->pid); 645 goto out; 646 } 647 648 list_add(&feed->list_head, &feed->demux->feed_list); 649 out: 650 spin_unlock_irq(&feed->demux->lock); 651 } 652 653 static void dvb_demux_feed_del(struct dvb_demux_feed *feed) 654 { 655 spin_lock_irq(&feed->demux->lock); 656 if (!(dvb_demux_feed_find(feed))) { 657 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n", 658 __func__, feed->type, feed->state, feed->pid); 659 goto out; 660 } 661 662 list_del(&feed->list_head); 663 out: 664 spin_unlock_irq(&feed->demux->lock); 665 } 666 667 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type, 668 enum dmx_ts_pes pes_type, 669 size_t circular_buffer_size, struct timespec timeout) 670 { 671 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 672 struct dvb_demux *demux = feed->demux; 673 674 if (pid > DMX_MAX_PID) 675 return -EINVAL; 676 677 if (mutex_lock_interruptible(&demux->mutex)) 678 return -ERESTARTSYS; 679 680 if (ts_type & TS_DECODER) { 681 if (pes_type >= DMX_PES_OTHER) { 682 mutex_unlock(&demux->mutex); 683 return -EINVAL; 684 } 685 686 if (demux->pesfilter[pes_type] && 687 demux->pesfilter[pes_type] != feed) { 688 mutex_unlock(&demux->mutex); 689 return -EINVAL; 690 } 691 692 demux->pesfilter[pes_type] = feed; 693 demux->pids[pes_type] = pid; 694 } 695 696 dvb_demux_feed_add(feed); 697 698 feed->pid = pid; 699 feed->buffer_size = circular_buffer_size; 700 feed->timeout = timeout; 701 feed->ts_type = ts_type; 702 feed->pes_type = pes_type; 703 704 if (feed->buffer_size) { 705 #ifdef NOBUFS 706 feed->buffer = NULL; 707 #else 708 feed->buffer = vmalloc(feed->buffer_size); 709 if (!feed->buffer) { 710 mutex_unlock(&demux->mutex); 711 return -ENOMEM; 712 } 713 #endif 714 } 715 716 feed->state = DMX_STATE_READY; 717 mutex_unlock(&demux->mutex); 718 719 return 0; 720 } 721 722 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed) 723 { 724 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 725 struct dvb_demux *demux = feed->demux; 726 int ret; 727 728 if (mutex_lock_interruptible(&demux->mutex)) 729 return -ERESTARTSYS; 730 731 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) { 732 mutex_unlock(&demux->mutex); 733 return -EINVAL; 734 } 735 736 if (!demux->start_feed) { 737 mutex_unlock(&demux->mutex); 738 return -ENODEV; 739 } 740 741 if ((ret = demux->start_feed(feed)) < 0) { 742 mutex_unlock(&demux->mutex); 743 return ret; 744 } 745 746 spin_lock_irq(&demux->lock); 747 ts_feed->is_filtering = 1; 748 feed->state = DMX_STATE_GO; 749 spin_unlock_irq(&demux->lock); 750 mutex_unlock(&demux->mutex); 751 752 return 0; 753 } 754 755 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed) 756 { 757 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 758 struct dvb_demux *demux = feed->demux; 759 int ret; 760 761 mutex_lock(&demux->mutex); 762 763 if (feed->state < DMX_STATE_GO) { 764 mutex_unlock(&demux->mutex); 765 return -EINVAL; 766 } 767 768 if (!demux->stop_feed) { 769 mutex_unlock(&demux->mutex); 770 return -ENODEV; 771 } 772 773 ret = demux->stop_feed(feed); 774 775 spin_lock_irq(&demux->lock); 776 ts_feed->is_filtering = 0; 777 feed->state = DMX_STATE_ALLOCATED; 778 spin_unlock_irq(&demux->lock); 779 mutex_unlock(&demux->mutex); 780 781 return ret; 782 } 783 784 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx, 785 struct dmx_ts_feed **ts_feed, 786 dmx_ts_cb callback) 787 { 788 struct dvb_demux *demux = (struct dvb_demux *)dmx; 789 struct dvb_demux_feed *feed; 790 791 if (mutex_lock_interruptible(&demux->mutex)) 792 return -ERESTARTSYS; 793 794 if (!(feed = dvb_dmx_feed_alloc(demux))) { 795 mutex_unlock(&demux->mutex); 796 return -EBUSY; 797 } 798 799 feed->type = DMX_TYPE_TS; 800 feed->cb.ts = callback; 801 feed->demux = demux; 802 feed->pid = 0xffff; 803 feed->peslen = 0xfffa; 804 feed->buffer = NULL; 805 806 (*ts_feed) = &feed->feed.ts; 807 (*ts_feed)->parent = dmx; 808 (*ts_feed)->priv = NULL; 809 (*ts_feed)->is_filtering = 0; 810 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering; 811 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering; 812 (*ts_feed)->set = dmx_ts_feed_set; 813 814 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) { 815 feed->state = DMX_STATE_FREE; 816 mutex_unlock(&demux->mutex); 817 return -EBUSY; 818 } 819 820 feed->filter->type = DMX_TYPE_TS; 821 feed->filter->feed = feed; 822 feed->filter->state = DMX_STATE_READY; 823 824 mutex_unlock(&demux->mutex); 825 826 return 0; 827 } 828 829 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, 830 struct dmx_ts_feed *ts_feed) 831 { 832 struct dvb_demux *demux = (struct dvb_demux *)dmx; 833 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 834 835 mutex_lock(&demux->mutex); 836 837 if (feed->state == DMX_STATE_FREE) { 838 mutex_unlock(&demux->mutex); 839 return -EINVAL; 840 } 841 #ifndef NOBUFS 842 vfree(feed->buffer); 843 feed->buffer = NULL; 844 #endif 845 846 feed->state = DMX_STATE_FREE; 847 feed->filter->state = DMX_STATE_FREE; 848 849 dvb_demux_feed_del(feed); 850 851 feed->pid = 0xffff; 852 853 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER) 854 demux->pesfilter[feed->pes_type] = NULL; 855 856 mutex_unlock(&demux->mutex); 857 return 0; 858 } 859 860 /****************************************************************************** 861 * dmx_section_feed API calls 862 ******************************************************************************/ 863 864 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed, 865 struct dmx_section_filter **filter) 866 { 867 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 868 struct dvb_demux *dvbdemux = dvbdmxfeed->demux; 869 struct dvb_demux_filter *dvbdmxfilter; 870 871 if (mutex_lock_interruptible(&dvbdemux->mutex)) 872 return -ERESTARTSYS; 873 874 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux); 875 if (!dvbdmxfilter) { 876 mutex_unlock(&dvbdemux->mutex); 877 return -EBUSY; 878 } 879 880 spin_lock_irq(&dvbdemux->lock); 881 *filter = &dvbdmxfilter->filter; 882 (*filter)->parent = feed; 883 (*filter)->priv = NULL; 884 dvbdmxfilter->feed = dvbdmxfeed; 885 dvbdmxfilter->type = DMX_TYPE_SEC; 886 dvbdmxfilter->state = DMX_STATE_READY; 887 dvbdmxfilter->next = dvbdmxfeed->filter; 888 dvbdmxfeed->filter = dvbdmxfilter; 889 spin_unlock_irq(&dvbdemux->lock); 890 891 mutex_unlock(&dvbdemux->mutex); 892 return 0; 893 } 894 895 static int dmx_section_feed_set(struct dmx_section_feed *feed, 896 u16 pid, size_t circular_buffer_size, 897 int check_crc) 898 { 899 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 900 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 901 902 if (pid > 0x1fff) 903 return -EINVAL; 904 905 if (mutex_lock_interruptible(&dvbdmx->mutex)) 906 return -ERESTARTSYS; 907 908 dvb_demux_feed_add(dvbdmxfeed); 909 910 dvbdmxfeed->pid = pid; 911 dvbdmxfeed->buffer_size = circular_buffer_size; 912 dvbdmxfeed->feed.sec.check_crc = check_crc; 913 914 #ifdef NOBUFS 915 dvbdmxfeed->buffer = NULL; 916 #else 917 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size); 918 if (!dvbdmxfeed->buffer) { 919 mutex_unlock(&dvbdmx->mutex); 920 return -ENOMEM; 921 } 922 #endif 923 924 dvbdmxfeed->state = DMX_STATE_READY; 925 mutex_unlock(&dvbdmx->mutex); 926 return 0; 927 } 928 929 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed) 930 { 931 int i; 932 struct dvb_demux_filter *f; 933 struct dmx_section_filter *sf; 934 u8 mask, mode, doneq; 935 936 if (!(f = dvbdmxfeed->filter)) 937 return; 938 do { 939 sf = &f->filter; 940 doneq = 0; 941 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 942 mode = sf->filter_mode[i]; 943 mask = sf->filter_mask[i]; 944 f->maskandmode[i] = mask & mode; 945 doneq |= f->maskandnotmode[i] = mask & ~mode; 946 } 947 f->doneq = doneq ? 1 : 0; 948 } while ((f = f->next)); 949 } 950 951 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed) 952 { 953 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 954 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 955 int ret; 956 957 if (mutex_lock_interruptible(&dvbdmx->mutex)) 958 return -ERESTARTSYS; 959 960 if (feed->is_filtering) { 961 mutex_unlock(&dvbdmx->mutex); 962 return -EBUSY; 963 } 964 965 if (!dvbdmxfeed->filter) { 966 mutex_unlock(&dvbdmx->mutex); 967 return -EINVAL; 968 } 969 970 dvbdmxfeed->feed.sec.tsfeedp = 0; 971 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 972 dvbdmxfeed->feed.sec.secbufp = 0; 973 dvbdmxfeed->feed.sec.seclen = 0; 974 975 if (!dvbdmx->start_feed) { 976 mutex_unlock(&dvbdmx->mutex); 977 return -ENODEV; 978 } 979 980 prepare_secfilters(dvbdmxfeed); 981 982 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) { 983 mutex_unlock(&dvbdmx->mutex); 984 return ret; 985 } 986 987 spin_lock_irq(&dvbdmx->lock); 988 feed->is_filtering = 1; 989 dvbdmxfeed->state = DMX_STATE_GO; 990 spin_unlock_irq(&dvbdmx->lock); 991 992 mutex_unlock(&dvbdmx->mutex); 993 return 0; 994 } 995 996 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed) 997 { 998 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 999 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1000 int ret; 1001 1002 mutex_lock(&dvbdmx->mutex); 1003 1004 if (!dvbdmx->stop_feed) { 1005 mutex_unlock(&dvbdmx->mutex); 1006 return -ENODEV; 1007 } 1008 1009 ret = dvbdmx->stop_feed(dvbdmxfeed); 1010 1011 spin_lock_irq(&dvbdmx->lock); 1012 dvbdmxfeed->state = DMX_STATE_READY; 1013 feed->is_filtering = 0; 1014 spin_unlock_irq(&dvbdmx->lock); 1015 1016 mutex_unlock(&dvbdmx->mutex); 1017 return ret; 1018 } 1019 1020 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed, 1021 struct dmx_section_filter *filter) 1022 { 1023 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f; 1024 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1025 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1026 1027 mutex_lock(&dvbdmx->mutex); 1028 1029 if (dvbdmxfilter->feed != dvbdmxfeed) { 1030 mutex_unlock(&dvbdmx->mutex); 1031 return -EINVAL; 1032 } 1033 1034 if (feed->is_filtering) { 1035 /* release dvbdmx->mutex as far as it is 1036 acquired by stop_filtering() itself */ 1037 mutex_unlock(&dvbdmx->mutex); 1038 feed->stop_filtering(feed); 1039 mutex_lock(&dvbdmx->mutex); 1040 } 1041 1042 spin_lock_irq(&dvbdmx->lock); 1043 f = dvbdmxfeed->filter; 1044 1045 if (f == dvbdmxfilter) { 1046 dvbdmxfeed->filter = dvbdmxfilter->next; 1047 } else { 1048 while (f->next != dvbdmxfilter) 1049 f = f->next; 1050 f->next = f->next->next; 1051 } 1052 1053 dvbdmxfilter->state = DMX_STATE_FREE; 1054 spin_unlock_irq(&dvbdmx->lock); 1055 mutex_unlock(&dvbdmx->mutex); 1056 return 0; 1057 } 1058 1059 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux, 1060 struct dmx_section_feed **feed, 1061 dmx_section_cb callback) 1062 { 1063 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1064 struct dvb_demux_feed *dvbdmxfeed; 1065 1066 if (mutex_lock_interruptible(&dvbdmx->mutex)) 1067 return -ERESTARTSYS; 1068 1069 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) { 1070 mutex_unlock(&dvbdmx->mutex); 1071 return -EBUSY; 1072 } 1073 1074 dvbdmxfeed->type = DMX_TYPE_SEC; 1075 dvbdmxfeed->cb.sec = callback; 1076 dvbdmxfeed->demux = dvbdmx; 1077 dvbdmxfeed->pid = 0xffff; 1078 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 1079 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0; 1080 dvbdmxfeed->feed.sec.tsfeedp = 0; 1081 dvbdmxfeed->filter = NULL; 1082 dvbdmxfeed->buffer = NULL; 1083 1084 (*feed) = &dvbdmxfeed->feed.sec; 1085 (*feed)->is_filtering = 0; 1086 (*feed)->parent = demux; 1087 (*feed)->priv = NULL; 1088 1089 (*feed)->set = dmx_section_feed_set; 1090 (*feed)->allocate_filter = dmx_section_feed_allocate_filter; 1091 (*feed)->start_filtering = dmx_section_feed_start_filtering; 1092 (*feed)->stop_filtering = dmx_section_feed_stop_filtering; 1093 (*feed)->release_filter = dmx_section_feed_release_filter; 1094 1095 mutex_unlock(&dvbdmx->mutex); 1096 return 0; 1097 } 1098 1099 static int dvbdmx_release_section_feed(struct dmx_demux *demux, 1100 struct dmx_section_feed *feed) 1101 { 1102 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1103 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1104 1105 mutex_lock(&dvbdmx->mutex); 1106 1107 if (dvbdmxfeed->state == DMX_STATE_FREE) { 1108 mutex_unlock(&dvbdmx->mutex); 1109 return -EINVAL; 1110 } 1111 #ifndef NOBUFS 1112 vfree(dvbdmxfeed->buffer); 1113 dvbdmxfeed->buffer = NULL; 1114 #endif 1115 dvbdmxfeed->state = DMX_STATE_FREE; 1116 1117 dvb_demux_feed_del(dvbdmxfeed); 1118 1119 dvbdmxfeed->pid = 0xffff; 1120 1121 mutex_unlock(&dvbdmx->mutex); 1122 return 0; 1123 } 1124 1125 /****************************************************************************** 1126 * dvb_demux kernel data API calls 1127 ******************************************************************************/ 1128 1129 static int dvbdmx_open(struct dmx_demux *demux) 1130 { 1131 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1132 1133 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS) 1134 return -EUSERS; 1135 1136 dvbdemux->users++; 1137 return 0; 1138 } 1139 1140 static int dvbdmx_close(struct dmx_demux *demux) 1141 { 1142 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1143 1144 if (dvbdemux->users == 0) 1145 return -ENODEV; 1146 1147 dvbdemux->users--; 1148 //FIXME: release any unneeded resources if users==0 1149 return 0; 1150 } 1151 1152 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count) 1153 { 1154 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1155 void *p; 1156 1157 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE)) 1158 return -EINVAL; 1159 1160 p = memdup_user(buf, count); 1161 if (IS_ERR(p)) 1162 return PTR_ERR(p); 1163 if (mutex_lock_interruptible(&dvbdemux->mutex)) { 1164 kfree(p); 1165 return -ERESTARTSYS; 1166 } 1167 dvb_dmx_swfilter(dvbdemux, p, count); 1168 kfree(p); 1169 mutex_unlock(&dvbdemux->mutex); 1170 1171 if (signal_pending(current)) 1172 return -EINTR; 1173 return count; 1174 } 1175 1176 static int dvbdmx_add_frontend(struct dmx_demux *demux, 1177 struct dmx_frontend *frontend) 1178 { 1179 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1180 struct list_head *head = &dvbdemux->frontend_list; 1181 1182 list_add(&(frontend->connectivity_list), head); 1183 1184 return 0; 1185 } 1186 1187 static int dvbdmx_remove_frontend(struct dmx_demux *demux, 1188 struct dmx_frontend *frontend) 1189 { 1190 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1191 struct list_head *pos, *n, *head = &dvbdemux->frontend_list; 1192 1193 list_for_each_safe(pos, n, head) { 1194 if (DMX_FE_ENTRY(pos) == frontend) { 1195 list_del(pos); 1196 return 0; 1197 } 1198 } 1199 1200 return -ENODEV; 1201 } 1202 1203 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux) 1204 { 1205 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1206 1207 if (list_empty(&dvbdemux->frontend_list)) 1208 return NULL; 1209 1210 return &dvbdemux->frontend_list; 1211 } 1212 1213 static int dvbdmx_connect_frontend(struct dmx_demux *demux, 1214 struct dmx_frontend *frontend) 1215 { 1216 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1217 1218 if (demux->frontend) 1219 return -EINVAL; 1220 1221 mutex_lock(&dvbdemux->mutex); 1222 1223 demux->frontend = frontend; 1224 mutex_unlock(&dvbdemux->mutex); 1225 return 0; 1226 } 1227 1228 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux) 1229 { 1230 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1231 1232 mutex_lock(&dvbdemux->mutex); 1233 1234 demux->frontend = NULL; 1235 mutex_unlock(&dvbdemux->mutex); 1236 return 0; 1237 } 1238 1239 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids) 1240 { 1241 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1242 1243 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16)); 1244 return 0; 1245 } 1246 1247 int dvb_dmx_init(struct dvb_demux *dvbdemux) 1248 { 1249 int i; 1250 struct dmx_demux *dmx = &dvbdemux->dmx; 1251 1252 dvbdemux->cnt_storage = NULL; 1253 dvbdemux->users = 0; 1254 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter)); 1255 1256 if (!dvbdemux->filter) 1257 return -ENOMEM; 1258 1259 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed)); 1260 if (!dvbdemux->feed) { 1261 vfree(dvbdemux->filter); 1262 dvbdemux->filter = NULL; 1263 return -ENOMEM; 1264 } 1265 for (i = 0; i < dvbdemux->filternum; i++) { 1266 dvbdemux->filter[i].state = DMX_STATE_FREE; 1267 dvbdemux->filter[i].index = i; 1268 } 1269 for (i = 0; i < dvbdemux->feednum; i++) { 1270 dvbdemux->feed[i].state = DMX_STATE_FREE; 1271 dvbdemux->feed[i].index = i; 1272 } 1273 1274 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1); 1275 if (!dvbdemux->cnt_storage) 1276 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n"); 1277 1278 INIT_LIST_HEAD(&dvbdemux->frontend_list); 1279 1280 for (i = 0; i < DMX_PES_OTHER; i++) { 1281 dvbdemux->pesfilter[i] = NULL; 1282 dvbdemux->pids[i] = 0xffff; 1283 } 1284 1285 INIT_LIST_HEAD(&dvbdemux->feed_list); 1286 1287 dvbdemux->playing = 0; 1288 dvbdemux->recording = 0; 1289 dvbdemux->tsbufp = 0; 1290 1291 if (!dvbdemux->check_crc32) 1292 dvbdemux->check_crc32 = dvb_dmx_crc32; 1293 1294 if (!dvbdemux->memcopy) 1295 dvbdemux->memcopy = dvb_dmx_memcopy; 1296 1297 dmx->frontend = NULL; 1298 dmx->priv = dvbdemux; 1299 dmx->open = dvbdmx_open; 1300 dmx->close = dvbdmx_close; 1301 dmx->write = dvbdmx_write; 1302 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed; 1303 dmx->release_ts_feed = dvbdmx_release_ts_feed; 1304 dmx->allocate_section_feed = dvbdmx_allocate_section_feed; 1305 dmx->release_section_feed = dvbdmx_release_section_feed; 1306 1307 dmx->add_frontend = dvbdmx_add_frontend; 1308 dmx->remove_frontend = dvbdmx_remove_frontend; 1309 dmx->get_frontends = dvbdmx_get_frontends; 1310 dmx->connect_frontend = dvbdmx_connect_frontend; 1311 dmx->disconnect_frontend = dvbdmx_disconnect_frontend; 1312 dmx->get_pes_pids = dvbdmx_get_pes_pids; 1313 1314 mutex_init(&dvbdemux->mutex); 1315 spin_lock_init(&dvbdemux->lock); 1316 1317 return 0; 1318 } 1319 1320 EXPORT_SYMBOL(dvb_dmx_init); 1321 1322 void dvb_dmx_release(struct dvb_demux *dvbdemux) 1323 { 1324 vfree(dvbdemux->cnt_storage); 1325 vfree(dvbdemux->filter); 1326 vfree(dvbdemux->feed); 1327 } 1328 1329 EXPORT_SYMBOL(dvb_dmx_release); 1330