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