drivers/media/dvb/dvb-core/dvb_demux.c

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