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