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