drivers/media/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 static int dvb_demux_feed_err_pkts = 1;
  54 module_param(dvb_demux_feed_err_pkts, int, 0644);
  55 MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
  56                  "when set to 0, drop packets with the TEI bit set (1 by default)");
  57
  58 #define dprintk_tscheck(x...) do {                              \
  59                 if (dvb_demux_tscheck && printk_ratelimit())    \
  60                         printk(x);                              \
  61         } while (0)
  62
  63 /******************************************************************************
  64  * static inlined helper functions
  65  ******************************************************************************/
  66
  67 static inline u16 section_length(const u8 *buf)
  68 {
  69         return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
  70 }
  71
  72 static inline u16 ts_pid(const u8 *buf)
  73 {
  74         return ((buf[1] & 0x1f) << 8) + buf[2];
  75 }
  76
  77 static inline u8 payload(const u8 *tsp)
  78 {
  79         if (!(tsp[3] & 0x10))   // no payload?
  80                 return 0;
  81
  82         if (tsp[3] & 0x20) {    // adaptation field?
  83                 if (tsp[4] > 183)       // corrupted data?
  84                         return 0;
  85                 else
  86                         return 184 - 1 - tsp[4];
  87         }
  88
  89         return 184;
  90 }
  91
  92 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
  93 {
  94         return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
  95 }
  96
  97 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
  98                             size_t len)
  99 {
 100         memcpy(d, s, len);
 101 }
 102
 103 /******************************************************************************
 104  * Software filter functions
 105  ******************************************************************************/
 106
 107 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
 108                                            const u8 *buf)
 109 {
 110         int count = payload(buf);
 111         int p;
 112         //int ccok;
 113         //u8 cc;
 114
 115         if (count == 0)
 116                 return -1;
 117
 118         p = 188 - count;
 119
 120         /*
 121         cc = buf[3] & 0x0f;
 122         ccok = ((feed->cc + 1) & 0x0f) == cc;
 123         feed->cc = cc;
 124         if (!ccok)
 125                 printk("missed packet!\n");
 126         */
 127
 128         if (buf[1] & 0x40)      // PUSI ?
 129                 feed->peslen = 0xfffa;
 130
 131         feed->peslen += count;
 132
 133         return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
 134 }
 135
 136 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 137                                           struct dvb_demux_filter *f)
 138 {
 139         u8 neq = 0;
 140         int i;
 141
 142         for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 143                 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 144
 145                 if (f->maskandmode[i] & xor)
 146                         return 0;
 147
 148                 neq |= f->maskandnotmode[i] & xor;
 149         }
 150
 151         if (f->doneq && !neq)
 152                 return 0;
 153
 154         return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 155                             NULL, 0, &f->filter, DMX_OK);
 156 }
 157
 158 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 159 {
 160         struct dvb_demux *demux = feed->demux;
 161         struct dvb_demux_filter *f = feed->filter;
 162         struct dmx_section_feed *sec = &feed->feed.sec;
 163         int section_syntax_indicator;
 164
 165         if (!sec->is_filtering)
 166                 return 0;
 167
 168         if (!f)
 169                 return 0;
 170
 171         if (sec->check_crc) {
 172                 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 173                 if (section_syntax_indicator &&
 174                     demux->check_crc32(feed, sec->secbuf, sec->seclen))
 175                         return -1;
 176         }
 177
 178         do {
 179                 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 180                         return -1;
 181         } while ((f = f->next) && sec->is_filtering);
 182
 183         sec->seclen = 0;
 184
 185         return 0;
 186 }
 187
 188 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 189 {
 190         struct dmx_section_feed *sec = &feed->feed.sec;
 191
 192 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 193         if (sec->secbufp < sec->tsfeedp) {
 194                 int i, n = sec->tsfeedp - sec->secbufp;
 195
 196                 /*
 197                  * Section padding is done with 0xff bytes entirely.
 198                  * Due to speed reasons, we won't check all of them
 199                  * but just first and last.
 200                  */
 201                 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 202                         printk("dvb_demux.c section ts padding loss: %d/%d\n",
 203                                n, sec->tsfeedp);
 204                         printk("dvb_demux.c pad data:");
 205                         for (i = 0; i < n; i++)
 206                                 printk(" %02x", sec->secbuf[i]);
 207                         printk("\n");
 208                 }
 209         }
 210 #endif
 211
 212         sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 213         sec->secbuf = sec->secbuf_base;
 214 }
 215
 216 /*
 217  * Losless Section Demux 1.4.1 by Emard
 218  * Valsecchi Patrick:
 219  *  - middle of section A  (no PUSI)
 220  *  - end of section A and start of section B
 221  *    (with PUSI pointing to the start of the second section)
 222  *
 223  *  In this case, without feed->pusi_seen you'll receive a garbage section
 224  *  consisting of the end of section A. Basically because tsfeedp
 225  *  is incemented and the use=0 condition is not raised
 226  *  when the second packet arrives.
 227  *
 228  * Fix:
 229  * when demux is started, let feed->pusi_seen = 0 to
 230  * prevent initial feeding of garbage from the end of
 231  * previous section. When you for the first time see PUSI=1
 232  * then set feed->pusi_seen = 1
 233  */
 234 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
 235                                               const u8 *buf, u8 len)
 236 {
 237         struct dvb_demux *demux = feed->demux;
 238         struct dmx_section_feed *sec = &feed->feed.sec;
 239         u16 limit, seclen, n;
 240
 241         if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 242                 return 0;
 243
 244         if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 245 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 246                 printk("dvb_demux.c section buffer full loss: %d/%d\n",
 247                        sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 248                        DMX_MAX_SECFEED_SIZE);
 249 #endif
 250                 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 251         }
 252
 253         if (len <= 0)
 254                 return 0;
 255
 256         demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 257         sec->tsfeedp += len;
 258
 259         /*
 260          * Dump all the sections we can find in the data (Emard)
 261          */
 262         limit = sec->tsfeedp;
 263         if (limit > DMX_MAX_SECFEED_SIZE)
 264                 return -1;      /* internal error should never happen */
 265
 266         /* to be sure always set secbuf */
 267         sec->secbuf = sec->secbuf_base + sec->secbufp;
 268
 269         for (n = 0; sec->secbufp + 2 < limit; n++) {
 270                 seclen = section_length(sec->secbuf);
 271                 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 272                     || seclen + sec->secbufp > limit)
 273                         return 0;
 274                 sec->seclen = seclen;
 275                 sec->crc_val = ~0;
 276                 /* dump [secbuf .. secbuf+seclen) */
 277                 if (feed->pusi_seen)
 278                         dvb_dmx_swfilter_section_feed(feed);
 279 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 280                 else
 281                         printk("dvb_demux.c pusi not seen, discarding section data\n");
 282 #endif
 283                 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 284                 sec->secbuf += seclen;  /* redundant but saves pointer arithmetic */
 285         }
 286
 287         return 0;
 288 }
 289
 290 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 291                                            const u8 *buf)
 292 {
 293         u8 p, count;
 294         int ccok, dc_i = 0;
 295         u8 cc;
 296
 297         count = payload(buf);
 298
 299         if (count == 0)         /* count == 0 if no payload or out of range */
 300                 return -1;
 301
 302         p = 188 - count;        /* payload start */
 303
 304         cc = buf[3] & 0x0f;
 305         ccok = ((feed->cc + 1) & 0x0f) == cc;
 306         feed->cc = cc;
 307
 308         if (buf[3] & 0x20) {
 309                 /* adaption field present, check for discontinuity_indicator */
 310                 if ((buf[4] > 0) && (buf[5] & 0x80))
 311                         dc_i = 1;
 312         }
 313
 314         if (!ccok || dc_i) {
 315 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 316                 printk("dvb_demux.c discontinuity detected %d bytes lost\n",
 317                        count);
 318                 /*
 319                  * those bytes under sume circumstances will again be reported
 320                  * in the following dvb_dmx_swfilter_section_new
 321                  */
 322 #endif
 323                 /*
 324                  * Discontinuity detected. Reset pusi_seen = 0 to
 325                  * stop feeding of suspicious data until next PUSI=1 arrives
 326                  */
 327                 feed->pusi_seen = 0;
 328                 dvb_dmx_swfilter_section_new(feed);
 329         }
 330
 331         if (buf[1] & 0x40) {
 332                 /* PUSI=1 (is set), section boundary is here */
 333                 if (count > 1 && buf[p] < count) {
 334                         const u8 *before = &buf[p + 1];
 335                         u8 before_len = buf[p];
 336                         const u8 *after = &before[before_len];
 337                         u8 after_len = count - 1 - before_len;
 338
 339                         dvb_dmx_swfilter_section_copy_dump(feed, before,
 340                                                            before_len);
 341                         /* before start of new section, set pusi_seen = 1 */
 342                         feed->pusi_seen = 1;
 343                         dvb_dmx_swfilter_section_new(feed);
 344                         dvb_dmx_swfilter_section_copy_dump(feed, after,
 345                                                            after_len);
 346                 }
 347 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 348                 else if (count > 0)
 349                         printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
 350 #endif
 351         } else {
 352                 /* PUSI=0 (is not set), no section boundary */
 353                 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 354         }
 355
 356         return 0;
 357 }
 358
 359 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 360                                                 const u8 *buf)
 361 {
 362         switch (feed->type) {
 363         case DMX_TYPE_TS:
 364                 if (!feed->feed.ts.is_filtering)
 365                         break;
 366                 if (feed->ts_type & TS_PACKET) {
 367                         if (feed->ts_type & TS_PAYLOAD_ONLY)
 368                                 dvb_dmx_swfilter_payload(feed, buf);
 369                         else
 370                                 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
 371                                             DMX_OK);
 372                 }
 373                 if (feed->ts_type & TS_DECODER)
 374                         if (feed->demux->write_to_decoder)
 375                                 feed->demux->write_to_decoder(feed, buf, 188);
 376                 break;
 377
 378         case DMX_TYPE_SEC:
 379                 if (!feed->feed.sec.is_filtering)
 380                         break;
 381                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 382                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 383                 break;
 384
 385         default:
 386                 break;
 387         }
 388 }
 389
 390 #define DVR_FEED(f)                                                     \
 391         (((f)->type == DMX_TYPE_TS) &&                                  \
 392         ((f)->feed.ts.is_filtering) &&                                  \
 393         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 394
 395 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 396 {
 397         struct dvb_demux_feed *feed;
 398         u16 pid = ts_pid(buf);
 399         int dvr_done = 0;
 400
 401         if (dvb_demux_speedcheck) {
 402                 struct timespec cur_time, delta_time;
 403                 u64 speed_bytes, speed_timedelta;
 404
 405                 demux->speed_pkts_cnt++;
 406
 407                 /* show speed every SPEED_PKTS_INTERVAL packets */
 408                 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 409                         cur_time = current_kernel_time();
 410
 411                         if (demux->speed_last_time.tv_sec != 0 &&
 412                                         demux->speed_last_time.tv_nsec != 0) {
 413                                 delta_time = timespec_sub(cur_time,
 414                                                 demux->speed_last_time);
 415                                 speed_bytes = (u64)demux->speed_pkts_cnt
 416                                         * 188 * 8;
 417                                 /* convert to 1024 basis */
 418                                 speed_bytes = 1000 * div64_u64(speed_bytes,
 419                                                 1024);
 420                                 speed_timedelta =
 421                                         (u64)timespec_to_ns(&delta_time);
 422                                 speed_timedelta = div64_u64(speed_timedelta,
 423                                                 1000000); /* nsec -> usec */
 424                                 printk(KERN_INFO "TS speed %llu Kbits/sec \n",
 425                                                 div64_u64(speed_bytes,
 426                                                         speed_timedelta));
 427                         }
 428
 429                         demux->speed_last_time = cur_time;
 430                         demux->speed_pkts_cnt = 0;
 431                 }
 432         }
 433
 434         if (buf[1] & 0x80) {
 435                 dprintk_tscheck("TEI detected. "
 436                                 "PID=0x%x data1=0x%x\n",
 437                                 pid, buf[1]);
 438                 /* data in this packet cant be trusted - drop it unless
 439                  * module option dvb_demux_feed_err_pkts is set */
 440                 if (!dvb_demux_feed_err_pkts)
 441                         return;
 442         } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 443         if (demux->cnt_storage && dvb_demux_tscheck) {
 444                 /* check pkt counter */
 445                 if (pid < MAX_PID) {
 446                         if ((buf[3] & 0xf) != demux->cnt_storage[pid])
 447                                 dprintk_tscheck("TS packet counter mismatch. "
 448                                                 "PID=0x%x expected 0x%x "
 449                                                 "got 0x%x\n",
 450                                                 pid, demux->cnt_storage[pid],
 451                                                 buf[3] & 0xf);
 452
 453                         demux->cnt_storage[pid] = ((buf[3] & 0xf) + 1)&0xf;
 454                 }
 455                 /* end check */
 456         }
 457
 458         list_for_each_entry(feed, &demux->feed_list, list_head) {
 459                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 460                         continue;
 461
 462                 /* copy each packet only once to the dvr device, even
 463                  * if a PID is in multiple filters (e.g. video + PCR) */
 464                 if ((DVR_FEED(feed)) && (dvr_done++))
 465                         continue;
 466
 467                 if (feed->pid == pid)
 468                         dvb_dmx_swfilter_packet_type(feed, buf);
 469                 else if (feed->pid == 0x2000)
 470                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
 471         }
 472 }
 473
 474 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 475                               size_t count)
 476 {
 477         spin_lock(&demux->lock);
 478
 479         while (count--) {
 480                 if (buf[0] == 0x47)
 481                         dvb_dmx_swfilter_packet(demux, buf);
 482                 buf += 188;
 483         }
 484
 485         spin_unlock(&demux->lock);
 486 }
 487
 488 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 489
 490 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 491                                    const int pktsize)
 492 {
 493         int start = pos, lost;
 494
 495         while (pos < count) {
 496                 if (buf[pos] == 0x47 ||
 497                     (pktsize == 204 && buf[pos] == 0xB8))
 498                         break;
 499                 pos++;
 500         }
 501
 502         lost = pos - start;
 503         if (lost) {
 504                 /* This garbage is part of a valid packet? */
 505                 int backtrack = pos - pktsize;
 506                 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 507                     (pktsize == 204 && buf[backtrack] == 0xB8)))
 508                         return backtrack;
 509         }
 510
 511         return pos;
 512 }
 513
 514 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 515 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 516                 size_t count, const int pktsize)
 517 {
 518         int p = 0, i, j;
 519         const u8 *q;
 520
 521         spin_lock(&demux->lock);
 522
 523         if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 524                 i = demux->tsbufp;
 525                 j = pktsize - i;
 526                 if (count < j) {
 527                         memcpy(&demux->tsbuf[i], buf, count);
 528                         demux->tsbufp += count;
 529                         goto bailout;
 530                 }
 531                 memcpy(&demux->tsbuf[i], buf, j);
 532                 if (demux->tsbuf[0] == 0x47) /* double check */
 533                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 534                 demux->tsbufp = 0;
 535                 p += j;
 536         }
 537
 538         while (1) {
 539                 p = find_next_packet(buf, p, count, pktsize);
 540                 if (p >= count)
 541                         break;
 542                 if (count - p < pktsize)
 543                         break;
 544
 545                 q = &buf[p];
 546
 547                 if (pktsize == 204 && (*q == 0xB8)) {
 548                         memcpy(demux->tsbuf, q, 188);
 549                         demux->tsbuf[0] = 0x47;
 550                         q = demux->tsbuf;
 551                 }
 552                 dvb_dmx_swfilter_packet(demux, q);
 553                 p += pktsize;
 554         }
 555
 556         i = count - p;
 557         if (i) {
 558                 memcpy(demux->tsbuf, &buf[p], i);
 559                 demux->tsbufp = i;
 560                 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 561                         demux->tsbuf[0] = 0x47;
 562         }
 563
 564 bailout:
 565         spin_unlock(&demux->lock);
 566 }
 567
 568 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 569 {
 570         _dvb_dmx_swfilter(demux, buf, count, 188);
 571 }
 572 EXPORT_SYMBOL(dvb_dmx_swfilter);
 573
 574 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 575 {
 576         _dvb_dmx_swfilter(demux, buf, count, 204);
 577 }
 578 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 579
 580 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 581 {
 582         spin_lock(&demux->lock);
 583
 584         demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, DMX_OK);
 585
 586         spin_unlock(&demux->lock);
 587 }
 588 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 589
 590 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 591 {
 592         int i;
 593
 594         for (i = 0; i < demux->filternum; i++)
 595                 if (demux->filter[i].state == DMX_STATE_FREE)
 596                         break;
 597
 598         if (i == demux->filternum)
 599                 return NULL;
 600
 601         demux->filter[i].state = DMX_STATE_ALLOCATED;
 602
 603         return &demux->filter[i];
 604 }
 605
 606 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 607 {
 608         int i;
 609
 610         for (i = 0; i < demux->feednum; i++)
 611                 if (demux->feed[i].state == DMX_STATE_FREE)
 612                         break;
 613
 614         if (i == demux->feednum)
 615                 return NULL;
 616
 617         demux->feed[i].state = DMX_STATE_ALLOCATED;
 618
 619         return &demux->feed[i];
 620 }
 621
 622 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 623 {
 624         struct dvb_demux_feed *entry;
 625
 626         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 627                 if (entry == feed)
 628                         return 1;
 629
 630         return 0;
 631 }
 632
 633 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 634 {
 635         spin_lock_irq(&feed->demux->lock);
 636         if (dvb_demux_feed_find(feed)) {
 637                 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
 638                        __func__, feed->type, feed->state, feed->pid);
 639                 goto out;
 640         }
 641
 642         list_add(&feed->list_head, &feed->demux->feed_list);
 643 out:
 644         spin_unlock_irq(&feed->demux->lock);
 645 }
 646
 647 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 648 {
 649         spin_lock_irq(&feed->demux->lock);
 650         if (!(dvb_demux_feed_find(feed))) {
 651                 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
 652                        __func__, feed->type, feed->state, feed->pid);
 653                 goto out;
 654         }
 655
 656         list_del(&feed->list_head);
 657 out:
 658         spin_unlock_irq(&feed->demux->lock);
 659 }
 660
 661 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 662                            enum dmx_ts_pes pes_type,
 663                            size_t circular_buffer_size, struct timespec timeout)
 664 {
 665         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 666         struct dvb_demux *demux = feed->demux;
 667
 668         if (pid > DMX_MAX_PID)
 669                 return -EINVAL;
 670
 671         if (mutex_lock_interruptible(&demux->mutex))
 672                 return -ERESTARTSYS;
 673
 674         if (ts_type & TS_DECODER) {
 675                 if (pes_type >= DMX_TS_PES_OTHER) {
 676                         mutex_unlock(&demux->mutex);
 677                         return -EINVAL;
 678                 }
 679
 680                 if (demux->pesfilter[pes_type] &&
 681                     demux->pesfilter[pes_type] != feed) {
 682                         mutex_unlock(&demux->mutex);
 683                         return -EINVAL;
 684                 }
 685
 686                 demux->pesfilter[pes_type] = feed;
 687                 demux->pids[pes_type] = pid;
 688         }
 689
 690         dvb_demux_feed_add(feed);
 691
 692         feed->pid = pid;
 693         feed->buffer_size = circular_buffer_size;
 694         feed->timeout = timeout;
 695         feed->ts_type = ts_type;
 696         feed->pes_type = pes_type;
 697
 698         if (feed->buffer_size) {
 699 #ifdef NOBUFS
 700                 feed->buffer = NULL;
 701 #else
 702                 feed->buffer = vmalloc(feed->buffer_size);
 703                 if (!feed->buffer) {
 704                         mutex_unlock(&demux->mutex);
 705                         return -ENOMEM;
 706                 }
 707 #endif
 708         }
 709
 710         feed->state = DMX_STATE_READY;
 711         mutex_unlock(&demux->mutex);
 712
 713         return 0;
 714 }
 715
 716 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 717 {
 718         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 719         struct dvb_demux *demux = feed->demux;
 720         int ret;
 721
 722         if (mutex_lock_interruptible(&demux->mutex))
 723                 return -ERESTARTSYS;
 724
 725         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 726                 mutex_unlock(&demux->mutex);
 727                 return -EINVAL;
 728         }
 729
 730         if (!demux->start_feed) {
 731                 mutex_unlock(&demux->mutex);
 732                 return -ENODEV;
 733         }
 734
 735         if ((ret = demux->start_feed(feed)) < 0) {
 736                 mutex_unlock(&demux->mutex);
 737                 return ret;
 738         }
 739
 740         spin_lock_irq(&demux->lock);
 741         ts_feed->is_filtering = 1;
 742         feed->state = DMX_STATE_GO;
 743         spin_unlock_irq(&demux->lock);
 744         mutex_unlock(&demux->mutex);
 745
 746         return 0;
 747 }
 748
 749 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 750 {
 751         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 752         struct dvb_demux *demux = feed->demux;
 753         int ret;
 754
 755         mutex_lock(&demux->mutex);
 756
 757         if (feed->state < DMX_STATE_GO) {
 758                 mutex_unlock(&demux->mutex);
 759                 return -EINVAL;
 760         }
 761
 762         if (!demux->stop_feed) {
 763                 mutex_unlock(&demux->mutex);
 764                 return -ENODEV;
 765         }
 766
 767         ret = demux->stop_feed(feed);
 768
 769         spin_lock_irq(&demux->lock);
 770         ts_feed->is_filtering = 0;
 771         feed->state = DMX_STATE_ALLOCATED;
 772         spin_unlock_irq(&demux->lock);
 773         mutex_unlock(&demux->mutex);
 774
 775         return ret;
 776 }
 777
 778 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 779                                    struct dmx_ts_feed **ts_feed,
 780                                    dmx_ts_cb callback)
 781 {
 782         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 783         struct dvb_demux_feed *feed;
 784
 785         if (mutex_lock_interruptible(&demux->mutex))
 786                 return -ERESTARTSYS;
 787
 788         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 789                 mutex_unlock(&demux->mutex);
 790                 return -EBUSY;
 791         }
 792
 793         feed->type = DMX_TYPE_TS;
 794         feed->cb.ts = callback;
 795         feed->demux = demux;
 796         feed->pid = 0xffff;
 797         feed->peslen = 0xfffa;
 798         feed->buffer = NULL;
 799
 800         (*ts_feed) = &feed->feed.ts;
 801         (*ts_feed)->parent = dmx;
 802         (*ts_feed)->priv = NULL;
 803         (*ts_feed)->is_filtering = 0;
 804         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 805         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 806         (*ts_feed)->set = dmx_ts_feed_set;
 807
 808         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 809                 feed->state = DMX_STATE_FREE;
 810                 mutex_unlock(&demux->mutex);
 811                 return -EBUSY;
 812         }
 813
 814         feed->filter->type = DMX_TYPE_TS;
 815         feed->filter->feed = feed;
 816         feed->filter->state = DMX_STATE_READY;
 817
 818         mutex_unlock(&demux->mutex);
 819
 820         return 0;
 821 }
 822
 823 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 824                                   struct dmx_ts_feed *ts_feed)
 825 {
 826         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 827         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 828
 829         mutex_lock(&demux->mutex);
 830
 831         if (feed->state == DMX_STATE_FREE) {
 832                 mutex_unlock(&demux->mutex);
 833                 return -EINVAL;
 834         }
 835 #ifndef NOBUFS
 836         vfree(feed->buffer);
 837         feed->buffer = NULL;
 838 #endif
 839
 840         feed->state = DMX_STATE_FREE;
 841         feed->filter->state = DMX_STATE_FREE;
 842
 843         dvb_demux_feed_del(feed);
 844
 845         feed->pid = 0xffff;
 846
 847         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_TS_PES_OTHER)
 848                 demux->pesfilter[feed->pes_type] = NULL;
 849
 850         mutex_unlock(&demux->mutex);
 851         return 0;
 852 }
 853
 854 /******************************************************************************
 855  * dmx_section_feed API calls
 856  ******************************************************************************/
 857
 858 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 859                                             struct dmx_section_filter **filter)
 860 {
 861         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 862         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 863         struct dvb_demux_filter *dvbdmxfilter;
 864
 865         if (mutex_lock_interruptible(&dvbdemux->mutex))
 866                 return -ERESTARTSYS;
 867
 868         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 869         if (!dvbdmxfilter) {
 870                 mutex_unlock(&dvbdemux->mutex);
 871                 return -EBUSY;
 872         }
 873
 874         spin_lock_irq(&dvbdemux->lock);
 875         *filter = &dvbdmxfilter->filter;
 876         (*filter)->parent = feed;
 877         (*filter)->priv = NULL;
 878         dvbdmxfilter->feed = dvbdmxfeed;
 879         dvbdmxfilter->type = DMX_TYPE_SEC;
 880         dvbdmxfilter->state = DMX_STATE_READY;
 881         dvbdmxfilter->next = dvbdmxfeed->filter;
 882         dvbdmxfeed->filter = dvbdmxfilter;
 883         spin_unlock_irq(&dvbdemux->lock);
 884
 885         mutex_unlock(&dvbdemux->mutex);
 886         return 0;
 887 }
 888
 889 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 890                                 u16 pid, size_t circular_buffer_size,
 891                                 int check_crc)
 892 {
 893         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 894         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 895
 896         if (pid > 0x1fff)
 897                 return -EINVAL;
 898
 899         if (mutex_lock_interruptible(&dvbdmx->mutex))
 900                 return -ERESTARTSYS;
 901
 902         dvb_demux_feed_add(dvbdmxfeed);
 903
 904         dvbdmxfeed->pid = pid;
 905         dvbdmxfeed->buffer_size = circular_buffer_size;
 906         dvbdmxfeed->feed.sec.check_crc = check_crc;
 907
 908 #ifdef NOBUFS
 909         dvbdmxfeed->buffer = NULL;
 910 #else
 911         dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
 912         if (!dvbdmxfeed->buffer) {
 913                 mutex_unlock(&dvbdmx->mutex);
 914                 return -ENOMEM;
 915         }
 916 #endif
 917
 918         dvbdmxfeed->state = DMX_STATE_READY;
 919         mutex_unlock(&dvbdmx->mutex);
 920         return 0;
 921 }
 922
 923 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 924 {
 925         int i;
 926         struct dvb_demux_filter *f;
 927         struct dmx_section_filter *sf;
 928         u8 mask, mode, doneq;
 929
 930         if (!(f = dvbdmxfeed->filter))
 931                 return;
 932         do {
 933                 sf = &f->filter;
 934                 doneq = 0;
 935                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 936                         mode = sf->filter_mode[i];
 937                         mask = sf->filter_mask[i];
 938                         f->maskandmode[i] = mask & mode;
 939                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 940                 }
 941                 f->doneq = doneq ? 1 : 0;
 942         } while ((f = f->next));
 943 }
 944
 945 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 946 {
 947         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 948         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 949         int ret;
 950
 951         if (mutex_lock_interruptible(&dvbdmx->mutex))
 952                 return -ERESTARTSYS;
 953
 954         if (feed->is_filtering) {
 955                 mutex_unlock(&dvbdmx->mutex);
 956                 return -EBUSY;
 957         }
 958
 959         if (!dvbdmxfeed->filter) {
 960                 mutex_unlock(&dvbdmx->mutex);
 961                 return -EINVAL;
 962         }
 963
 964         dvbdmxfeed->feed.sec.tsfeedp = 0;
 965         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 966         dvbdmxfeed->feed.sec.secbufp = 0;
 967         dvbdmxfeed->feed.sec.seclen = 0;
 968
 969         if (!dvbdmx->start_feed) {
 970                 mutex_unlock(&dvbdmx->mutex);
 971                 return -ENODEV;
 972         }
 973
 974         prepare_secfilters(dvbdmxfeed);
 975
 976         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 977                 mutex_unlock(&dvbdmx->mutex);
 978                 return ret;
 979         }
 980
 981         spin_lock_irq(&dvbdmx->lock);
 982         feed->is_filtering = 1;
 983         dvbdmxfeed->state = DMX_STATE_GO;
 984         spin_unlock_irq(&dvbdmx->lock);
 985
 986         mutex_unlock(&dvbdmx->mutex);
 987         return 0;
 988 }
 989
 990 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 991 {
 992         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 993         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 994         int ret;
 995
 996         mutex_lock(&dvbdmx->mutex);
 997
 998         if (!dvbdmx->stop_feed) {
 999                 mutex_unlock(&dvbdmx->mutex);
1000                 return -ENODEV;
1001         }
1002
1003         ret = dvbdmx->stop_feed(dvbdmxfeed);
1004
1005         spin_lock_irq(&dvbdmx->lock);
1006         dvbdmxfeed->state = DMX_STATE_READY;
1007         feed->is_filtering = 0;
1008         spin_unlock_irq(&dvbdmx->lock);
1009
1010         mutex_unlock(&dvbdmx->mutex);
1011         return ret;
1012 }
1013
1014 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
1015                                            struct dmx_section_filter *filter)
1016 {
1017         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
1018         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1019         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1020
1021         mutex_lock(&dvbdmx->mutex);
1022
1023         if (dvbdmxfilter->feed != dvbdmxfeed) {
1024                 mutex_unlock(&dvbdmx->mutex);
1025                 return -EINVAL;
1026         }
1027
1028         if (feed->is_filtering)
1029                 feed->stop_filtering(feed);
1030
1031         spin_lock_irq(&dvbdmx->lock);
1032         f = dvbdmxfeed->filter;
1033
1034         if (f == dvbdmxfilter) {
1035                 dvbdmxfeed->filter = dvbdmxfilter->next;
1036         } else {
1037                 while (f->next != dvbdmxfilter)
1038                         f = f->next;
1039                 f->next = f->next->next;
1040         }
1041
1042         dvbdmxfilter->state = DMX_STATE_FREE;
1043         spin_unlock_irq(&dvbdmx->lock);
1044         mutex_unlock(&dvbdmx->mutex);
1045         return 0;
1046 }
1047
1048 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1049                                         struct dmx_section_feed **feed,
1050                                         dmx_section_cb callback)
1051 {
1052         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1053         struct dvb_demux_feed *dvbdmxfeed;
1054
1055         if (mutex_lock_interruptible(&dvbdmx->mutex))
1056                 return -ERESTARTSYS;
1057
1058         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1059                 mutex_unlock(&dvbdmx->mutex);
1060                 return -EBUSY;
1061         }
1062
1063         dvbdmxfeed->type = DMX_TYPE_SEC;
1064         dvbdmxfeed->cb.sec = callback;
1065         dvbdmxfeed->demux = dvbdmx;
1066         dvbdmxfeed->pid = 0xffff;
1067         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1068         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1069         dvbdmxfeed->feed.sec.tsfeedp = 0;
1070         dvbdmxfeed->filter = NULL;
1071         dvbdmxfeed->buffer = NULL;
1072
1073         (*feed) = &dvbdmxfeed->feed.sec;
1074         (*feed)->is_filtering = 0;
1075         (*feed)->parent = demux;
1076         (*feed)->priv = NULL;
1077
1078         (*feed)->set = dmx_section_feed_set;
1079         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1080         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1081         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1082         (*feed)->release_filter = dmx_section_feed_release_filter;
1083
1084         mutex_unlock(&dvbdmx->mutex);
1085         return 0;
1086 }
1087
1088 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1089                                        struct dmx_section_feed *feed)
1090 {
1091         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1092         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1093
1094         mutex_lock(&dvbdmx->mutex);
1095
1096         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1097                 mutex_unlock(&dvbdmx->mutex);
1098                 return -EINVAL;
1099         }
1100 #ifndef NOBUFS
1101         vfree(dvbdmxfeed->buffer);
1102         dvbdmxfeed->buffer = NULL;
1103 #endif
1104         dvbdmxfeed->state = DMX_STATE_FREE;
1105
1106         dvb_demux_feed_del(dvbdmxfeed);
1107
1108         dvbdmxfeed->pid = 0xffff;
1109
1110         mutex_unlock(&dvbdmx->mutex);
1111         return 0;
1112 }
1113
1114 /******************************************************************************
1115  * dvb_demux kernel data API calls
1116  ******************************************************************************/
1117
1118 static int dvbdmx_open(struct dmx_demux *demux)
1119 {
1120         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1121
1122         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1123                 return -EUSERS;
1124
1125         dvbdemux->users++;
1126         return 0;
1127 }
1128
1129 static int dvbdmx_close(struct dmx_demux *demux)
1130 {
1131         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1132
1133         if (dvbdemux->users == 0)
1134                 return -ENODEV;
1135
1136         dvbdemux->users--;
1137         //FIXME: release any unneeded resources if users==0
1138         return 0;
1139 }
1140
1141 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1142 {
1143         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1144         void *p;
1145
1146         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1147                 return -EINVAL;
1148
1149         p = memdup_user(buf, count);
1150         if (IS_ERR(p))
1151                 return PTR_ERR(p);
1152         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1153                 kfree(p);
1154                 return -ERESTARTSYS;
1155         }
1156         dvb_dmx_swfilter(dvbdemux, p, count);
1157         kfree(p);
1158         mutex_unlock(&dvbdemux->mutex);
1159
1160         if (signal_pending(current))
1161                 return -EINTR;
1162         return count;
1163 }
1164
1165 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1166                                struct dmx_frontend *frontend)
1167 {
1168         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1169         struct list_head *head = &dvbdemux->frontend_list;
1170
1171         list_add(&(frontend->connectivity_list), head);
1172
1173         return 0;
1174 }
1175
1176 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1177                                   struct dmx_frontend *frontend)
1178 {
1179         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1180         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1181
1182         list_for_each_safe(pos, n, head) {
1183                 if (DMX_FE_ENTRY(pos) == frontend) {
1184                         list_del(pos);
1185                         return 0;
1186                 }
1187         }
1188
1189         return -ENODEV;
1190 }
1191
1192 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1193 {
1194         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1195
1196         if (list_empty(&dvbdemux->frontend_list))
1197                 return NULL;
1198
1199         return &dvbdemux->frontend_list;
1200 }
1201
1202 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1203                                    struct dmx_frontend *frontend)
1204 {
1205         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1206
1207         if (demux->frontend)
1208                 return -EINVAL;
1209
1210         mutex_lock(&dvbdemux->mutex);
1211
1212         demux->frontend = frontend;
1213         mutex_unlock(&dvbdemux->mutex);
1214         return 0;
1215 }
1216
1217 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1218 {
1219         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1220
1221         mutex_lock(&dvbdemux->mutex);
1222
1223         demux->frontend = NULL;
1224         mutex_unlock(&dvbdemux->mutex);
1225         return 0;
1226 }
1227
1228 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1229 {
1230         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1231
1232         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1233         return 0;
1234 }
1235
1236 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1237 {
1238         int i;
1239         struct dmx_demux *dmx = &dvbdemux->dmx;
1240
1241         dvbdemux->cnt_storage = NULL;
1242         dvbdemux->users = 0;
1243         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1244
1245         if (!dvbdemux->filter)
1246                 return -ENOMEM;
1247
1248         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1249         if (!dvbdemux->feed) {
1250                 vfree(dvbdemux->filter);
1251                 dvbdemux->filter = NULL;
1252                 return -ENOMEM;
1253         }
1254         for (i = 0; i < dvbdemux->filternum; i++) {
1255                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1256                 dvbdemux->filter[i].index = i;
1257         }
1258         for (i = 0; i < dvbdemux->feednum; i++) {
1259                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1260                 dvbdemux->feed[i].index = i;
1261         }
1262
1263         dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1264         if (!dvbdemux->cnt_storage)
1265                 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
1266
1267         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1268
1269         for (i = 0; i < DMX_TS_PES_OTHER; i++) {
1270                 dvbdemux->pesfilter[i] = NULL;
1271                 dvbdemux->pids[i] = 0xffff;
1272         }
1273
1274         INIT_LIST_HEAD(&dvbdemux->feed_list);
1275
1276         dvbdemux->playing = 0;
1277         dvbdemux->recording = 0;
1278         dvbdemux->tsbufp = 0;
1279
1280         if (!dvbdemux->check_crc32)
1281                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1282
1283         if (!dvbdemux->memcopy)
1284                 dvbdemux->memcopy = dvb_dmx_memcopy;
1285
1286         dmx->frontend = NULL;
1287         dmx->priv = dvbdemux;
1288         dmx->open = dvbdmx_open;
1289         dmx->close = dvbdmx_close;
1290         dmx->write = dvbdmx_write;
1291         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1292         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1293         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1294         dmx->release_section_feed = dvbdmx_release_section_feed;
1295
1296         dmx->add_frontend = dvbdmx_add_frontend;
1297         dmx->remove_frontend = dvbdmx_remove_frontend;
1298         dmx->get_frontends = dvbdmx_get_frontends;
1299         dmx->connect_frontend = dvbdmx_connect_frontend;
1300         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1301         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1302
1303         mutex_init(&dvbdemux->mutex);
1304         spin_lock_init(&dvbdemux->lock);
1305
1306         return 0;
1307 }
1308
1309 EXPORT_SYMBOL(dvb_dmx_init);
1310
1311 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1312 {
1313         vfree(dvbdemux->cnt_storage);
1314         vfree(dvbdemux->filter);
1315         vfree(dvbdemux->feed);
1316 }
1317
1318 EXPORT_SYMBOL(dvb_dmx_release);