kernel/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);
 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);
 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                 }
 372                 if (feed->ts_type & TS_DECODER)
 373                         if (feed->demux->write_to_decoder)
 374                                 feed->demux->write_to_decoder(feed, buf, 188);
 375                 break;
 376
 377         case DMX_TYPE_SEC:
 378                 if (!feed->feed.sec.is_filtering)
 379                         break;
 380                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 381                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 382                 break;
 383
 384         default:
 385                 break;
 386         }
 387 }
 388
 389 #define DVR_FEED(f)                                                     \
 390         (((f)->type == DMX_TYPE_TS) &&                                  \
 391         ((f)->feed.ts.is_filtering) &&                                  \
 392         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 393
 394 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 395 {
 396         struct dvb_demux_feed *feed;
 397         u16 pid = ts_pid(buf);
 398         int dvr_done = 0;
 399
 400         if (dvb_demux_speedcheck) {
 401                 struct timespec cur_time, delta_time;
 402                 u64 speed_bytes, speed_timedelta;
 403
 404                 demux->speed_pkts_cnt++;
 405
 406                 /* show speed every SPEED_PKTS_INTERVAL packets */
 407                 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 408                         cur_time = current_kernel_time();
 409
 410                         if (demux->speed_last_time.tv_sec != 0 &&
 411                                         demux->speed_last_time.tv_nsec != 0) {
 412                                 delta_time = timespec_sub(cur_time,
 413                                                 demux->speed_last_time);
 414                                 speed_bytes = (u64)demux->speed_pkts_cnt
 415                                         * 188 * 8;
 416                                 /* convert to 1024 basis */
 417                                 speed_bytes = 1000 * div64_u64(speed_bytes,
 418                                                 1024);
 419                                 speed_timedelta =
 420                                         (u64)timespec_to_ns(&delta_time);
 421                                 speed_timedelta = div64_u64(speed_timedelta,
 422                                                 1000000); /* nsec -> usec */
 423                                 printk(KERN_INFO "TS speed %llu Kbits/sec \n",
 424                                                 div64_u64(speed_bytes,
 425                                                         speed_timedelta));
 426                         }
 427
 428                         demux->speed_last_time = cur_time;
 429                         demux->speed_pkts_cnt = 0;
 430                 }
 431         }
 432
 433         if (buf[1] & 0x80) {
 434                 dprintk_tscheck("TEI detected. "
 435                                 "PID=0x%x data1=0x%x\n",
 436                                 pid, buf[1]);
 437                 /* data in this packet can't be trusted - drop it unless
 438                  * module option dvb_demux_feed_err_pkts is set */
 439                 if (!dvb_demux_feed_err_pkts)
 440                         return;
 441         } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 442                 if (demux->cnt_storage && dvb_demux_tscheck) {
 443                         /* check pkt counter */
 444                         if (pid < MAX_PID) {
 445                                 if (buf[3] & 0x10)
 446                                         demux->cnt_storage[pid] =
 447                                                 (demux->cnt_storage[pid] + 1) & 0xf;
 448
 449                                 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
 450                                         dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
 451                                                 pid, demux->cnt_storage[pid],
 452                                                 buf[3] & 0xf);
 453                                         demux->cnt_storage[pid] = buf[3] & 0xf;
 454                                 }
 455                         }
 456                         /* end check */
 457                 }
 458
 459         list_for_each_entry(feed, &demux->feed_list, list_head) {
 460                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 461                         continue;
 462
 463                 /* copy each packet only once to the dvr device, even
 464                  * if a PID is in multiple filters (e.g. video + PCR) */
 465                 if ((DVR_FEED(feed)) && (dvr_done++))
 466                         continue;
 467
 468                 if (feed->pid == pid)
 469                         dvb_dmx_swfilter_packet_type(feed, buf);
 470                 else if (feed->pid == 0x2000)
 471                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 472         }
 473 }
 474
 475 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 476                               size_t count)
 477 {
 478         unsigned long flags;
 479
 480         spin_lock_irqsave(&demux->lock, flags);
 481
 482         while (count--) {
 483                 if (buf[0] == 0x47)
 484                         dvb_dmx_swfilter_packet(demux, buf);
 485                 buf += 188;
 486         }
 487
 488         spin_unlock_irqrestore(&demux->lock, flags);
 489 }
 490
 491 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 492
 493 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 494                                    const int pktsize)
 495 {
 496         int start = pos, lost;
 497
 498         while (pos < count) {
 499                 if (buf[pos] == 0x47 ||
 500                     (pktsize == 204 && buf[pos] == 0xB8))
 501                         break;
 502                 pos++;
 503         }
 504
 505         lost = pos - start;
 506         if (lost) {
 507                 /* This garbage is part of a valid packet? */
 508                 int backtrack = pos - pktsize;
 509                 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 510                     (pktsize == 204 && buf[backtrack] == 0xB8)))
 511                         return backtrack;
 512         }
 513
 514         return pos;
 515 }
 516
 517 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 518 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 519                 size_t count, const int pktsize)
 520 {
 521         int p = 0, i, j;
 522         const u8 *q;
 523         unsigned long flags;
 524
 525         spin_lock_irqsave(&demux->lock, flags);
 526
 527         if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 528                 i = demux->tsbufp;
 529                 j = pktsize - i;
 530                 if (count < j) {
 531                         memcpy(&demux->tsbuf[i], buf, count);
 532                         demux->tsbufp += count;
 533                         goto bailout;
 534                 }
 535                 memcpy(&demux->tsbuf[i], buf, j);
 536                 if (demux->tsbuf[0] == 0x47) /* double check */
 537                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 538                 demux->tsbufp = 0;
 539                 p += j;
 540         }
 541
 542         while (1) {
 543                 p = find_next_packet(buf, p, count, pktsize);
 544                 if (p >= count)
 545                         break;
 546                 if (count - p < pktsize)
 547                         break;
 548
 549                 q = &buf[p];
 550
 551                 if (pktsize == 204 && (*q == 0xB8)) {
 552                         memcpy(demux->tsbuf, q, 188);
 553                         demux->tsbuf[0] = 0x47;
 554                         q = demux->tsbuf;
 555                 }
 556                 dvb_dmx_swfilter_packet(demux, q);
 557                 p += pktsize;
 558         }
 559
 560         i = count - p;
 561         if (i) {
 562                 memcpy(demux->tsbuf, &buf[p], i);
 563                 demux->tsbufp = i;
 564                 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 565                         demux->tsbuf[0] = 0x47;
 566         }
 567
 568 bailout:
 569         spin_unlock_irqrestore(&demux->lock, flags);
 570 }
 571
 572 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 573 {
 574         _dvb_dmx_swfilter(demux, buf, count, 188);
 575 }
 576 EXPORT_SYMBOL(dvb_dmx_swfilter);
 577
 578 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 579 {
 580         _dvb_dmx_swfilter(demux, buf, count, 204);
 581 }
 582 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 583
 584 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 585 {
 586         unsigned long flags;
 587
 588         spin_lock_irqsave(&demux->lock, flags);
 589
 590         demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts);
 591
 592         spin_unlock_irqrestore(&demux->lock, flags);
 593 }
 594 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 595
 596 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 597 {
 598         int i;
 599
 600         for (i = 0; i < demux->filternum; i++)
 601                 if (demux->filter[i].state == DMX_STATE_FREE)
 602                         break;
 603
 604         if (i == demux->filternum)
 605                 return NULL;
 606
 607         demux->filter[i].state = DMX_STATE_ALLOCATED;
 608
 609         return &demux->filter[i];
 610 }
 611
 612 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 613 {
 614         int i;
 615
 616         for (i = 0; i < demux->feednum; i++)
 617                 if (demux->feed[i].state == DMX_STATE_FREE)
 618                         break;
 619
 620         if (i == demux->feednum)
 621                 return NULL;
 622
 623         demux->feed[i].state = DMX_STATE_ALLOCATED;
 624
 625         return &demux->feed[i];
 626 }
 627
 628 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 629 {
 630         struct dvb_demux_feed *entry;
 631
 632         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 633                 if (entry == feed)
 634                         return 1;
 635
 636         return 0;
 637 }
 638
 639 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 640 {
 641         spin_lock_irq(&feed->demux->lock);
 642         if (dvb_demux_feed_find(feed)) {
 643                 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
 644                        __func__, feed->type, feed->state, feed->pid);
 645                 goto out;
 646         }
 647
 648         list_add(&feed->list_head, &feed->demux->feed_list);
 649 out:
 650         spin_unlock_irq(&feed->demux->lock);
 651 }
 652
 653 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 654 {
 655         spin_lock_irq(&feed->demux->lock);
 656         if (!(dvb_demux_feed_find(feed))) {
 657                 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
 658                        __func__, feed->type, feed->state, feed->pid);
 659                 goto out;
 660         }
 661
 662         list_del(&feed->list_head);
 663 out:
 664         spin_unlock_irq(&feed->demux->lock);
 665 }
 666
 667 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 668                            enum dmx_ts_pes pes_type,
 669                            size_t circular_buffer_size, struct timespec timeout)
 670 {
 671         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 672         struct dvb_demux *demux = feed->demux;
 673
 674         if (pid > DMX_MAX_PID)
 675                 return -EINVAL;
 676
 677         if (mutex_lock_interruptible(&demux->mutex))
 678                 return -ERESTARTSYS;
 679
 680         if (ts_type & TS_DECODER) {
 681                 if (pes_type >= DMX_PES_OTHER) {
 682                         mutex_unlock(&demux->mutex);
 683                         return -EINVAL;
 684                 }
 685
 686                 if (demux->pesfilter[pes_type] &&
 687                     demux->pesfilter[pes_type] != feed) {
 688                         mutex_unlock(&demux->mutex);
 689                         return -EINVAL;
 690                 }
 691
 692                 demux->pesfilter[pes_type] = feed;
 693                 demux->pids[pes_type] = pid;
 694         }
 695
 696         dvb_demux_feed_add(feed);
 697
 698         feed->pid = pid;
 699         feed->buffer_size = circular_buffer_size;
 700         feed->timeout = timeout;
 701         feed->ts_type = ts_type;
 702         feed->pes_type = pes_type;
 703
 704         if (feed->buffer_size) {
 705 #ifdef NOBUFS
 706                 feed->buffer = NULL;
 707 #else
 708                 feed->buffer = vmalloc(feed->buffer_size);
 709                 if (!feed->buffer) {
 710                         mutex_unlock(&demux->mutex);
 711                         return -ENOMEM;
 712                 }
 713 #endif
 714         }
 715
 716         feed->state = DMX_STATE_READY;
 717         mutex_unlock(&demux->mutex);
 718
 719         return 0;
 720 }
 721
 722 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 723 {
 724         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 725         struct dvb_demux *demux = feed->demux;
 726         int ret;
 727
 728         if (mutex_lock_interruptible(&demux->mutex))
 729                 return -ERESTARTSYS;
 730
 731         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 732                 mutex_unlock(&demux->mutex);
 733                 return -EINVAL;
 734         }
 735
 736         if (!demux->start_feed) {
 737                 mutex_unlock(&demux->mutex);
 738                 return -ENODEV;
 739         }
 740
 741         if ((ret = demux->start_feed(feed)) < 0) {
 742                 mutex_unlock(&demux->mutex);
 743                 return ret;
 744         }
 745
 746         spin_lock_irq(&demux->lock);
 747         ts_feed->is_filtering = 1;
 748         feed->state = DMX_STATE_GO;
 749         spin_unlock_irq(&demux->lock);
 750         mutex_unlock(&demux->mutex);
 751
 752         return 0;
 753 }
 754
 755 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 756 {
 757         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 758         struct dvb_demux *demux = feed->demux;
 759         int ret;
 760
 761         mutex_lock(&demux->mutex);
 762
 763         if (feed->state < DMX_STATE_GO) {
 764                 mutex_unlock(&demux->mutex);
 765                 return -EINVAL;
 766         }
 767
 768         if (!demux->stop_feed) {
 769                 mutex_unlock(&demux->mutex);
 770                 return -ENODEV;
 771         }
 772
 773         ret = demux->stop_feed(feed);
 774
 775         spin_lock_irq(&demux->lock);
 776         ts_feed->is_filtering = 0;
 777         feed->state = DMX_STATE_ALLOCATED;
 778         spin_unlock_irq(&demux->lock);
 779         mutex_unlock(&demux->mutex);
 780
 781         return ret;
 782 }
 783
 784 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 785                                    struct dmx_ts_feed **ts_feed,
 786                                    dmx_ts_cb callback)
 787 {
 788         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 789         struct dvb_demux_feed *feed;
 790
 791         if (mutex_lock_interruptible(&demux->mutex))
 792                 return -ERESTARTSYS;
 793
 794         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 795                 mutex_unlock(&demux->mutex);
 796                 return -EBUSY;
 797         }
 798
 799         feed->type = DMX_TYPE_TS;
 800         feed->cb.ts = callback;
 801         feed->demux = demux;
 802         feed->pid = 0xffff;
 803         feed->peslen = 0xfffa;
 804         feed->buffer = NULL;
 805
 806         (*ts_feed) = &feed->feed.ts;
 807         (*ts_feed)->parent = dmx;
 808         (*ts_feed)->priv = NULL;
 809         (*ts_feed)->is_filtering = 0;
 810         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 811         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 812         (*ts_feed)->set = dmx_ts_feed_set;
 813
 814         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 815                 feed->state = DMX_STATE_FREE;
 816                 mutex_unlock(&demux->mutex);
 817                 return -EBUSY;
 818         }
 819
 820         feed->filter->type = DMX_TYPE_TS;
 821         feed->filter->feed = feed;
 822         feed->filter->state = DMX_STATE_READY;
 823
 824         mutex_unlock(&demux->mutex);
 825
 826         return 0;
 827 }
 828
 829 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 830                                   struct dmx_ts_feed *ts_feed)
 831 {
 832         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 833         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 834
 835         mutex_lock(&demux->mutex);
 836
 837         if (feed->state == DMX_STATE_FREE) {
 838                 mutex_unlock(&demux->mutex);
 839                 return -EINVAL;
 840         }
 841 #ifndef NOBUFS
 842         vfree(feed->buffer);
 843         feed->buffer = NULL;
 844 #endif
 845
 846         feed->state = DMX_STATE_FREE;
 847         feed->filter->state = DMX_STATE_FREE;
 848
 849         dvb_demux_feed_del(feed);
 850
 851         feed->pid = 0xffff;
 852
 853         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
 854                 demux->pesfilter[feed->pes_type] = NULL;
 855
 856         mutex_unlock(&demux->mutex);
 857         return 0;
 858 }
 859
 860 /******************************************************************************
 861  * dmx_section_feed API calls
 862  ******************************************************************************/
 863
 864 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 865                                             struct dmx_section_filter **filter)
 866 {
 867         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 868         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 869         struct dvb_demux_filter *dvbdmxfilter;
 870
 871         if (mutex_lock_interruptible(&dvbdemux->mutex))
 872                 return -ERESTARTSYS;
 873
 874         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 875         if (!dvbdmxfilter) {
 876                 mutex_unlock(&dvbdemux->mutex);
 877                 return -EBUSY;
 878         }
 879
 880         spin_lock_irq(&dvbdemux->lock);
 881         *filter = &dvbdmxfilter->filter;
 882         (*filter)->parent = feed;
 883         (*filter)->priv = NULL;
 884         dvbdmxfilter->feed = dvbdmxfeed;
 885         dvbdmxfilter->type = DMX_TYPE_SEC;
 886         dvbdmxfilter->state = DMX_STATE_READY;
 887         dvbdmxfilter->next = dvbdmxfeed->filter;
 888         dvbdmxfeed->filter = dvbdmxfilter;
 889         spin_unlock_irq(&dvbdemux->lock);
 890
 891         mutex_unlock(&dvbdemux->mutex);
 892         return 0;
 893 }
 894
 895 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 896                                 u16 pid, size_t circular_buffer_size,
 897                                 int check_crc)
 898 {
 899         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 900         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 901
 902         if (pid > 0x1fff)
 903                 return -EINVAL;
 904
 905         if (mutex_lock_interruptible(&dvbdmx->mutex))
 906                 return -ERESTARTSYS;
 907
 908         dvb_demux_feed_add(dvbdmxfeed);
 909
 910         dvbdmxfeed->pid = pid;
 911         dvbdmxfeed->buffer_size = circular_buffer_size;
 912         dvbdmxfeed->feed.sec.check_crc = check_crc;
 913
 914 #ifdef NOBUFS
 915         dvbdmxfeed->buffer = NULL;
 916 #else
 917         dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
 918         if (!dvbdmxfeed->buffer) {
 919                 mutex_unlock(&dvbdmx->mutex);
 920                 return -ENOMEM;
 921         }
 922 #endif
 923
 924         dvbdmxfeed->state = DMX_STATE_READY;
 925         mutex_unlock(&dvbdmx->mutex);
 926         return 0;
 927 }
 928
 929 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 930 {
 931         int i;
 932         struct dvb_demux_filter *f;
 933         struct dmx_section_filter *sf;
 934         u8 mask, mode, doneq;
 935
 936         if (!(f = dvbdmxfeed->filter))
 937                 return;
 938         do {
 939                 sf = &f->filter;
 940                 doneq = 0;
 941                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 942                         mode = sf->filter_mode[i];
 943                         mask = sf->filter_mask[i];
 944                         f->maskandmode[i] = mask & mode;
 945                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 946                 }
 947                 f->doneq = doneq ? 1 : 0;
 948         } while ((f = f->next));
 949 }
 950
 951 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 952 {
 953         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 954         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 955         int ret;
 956
 957         if (mutex_lock_interruptible(&dvbdmx->mutex))
 958                 return -ERESTARTSYS;
 959
 960         if (feed->is_filtering) {
 961                 mutex_unlock(&dvbdmx->mutex);
 962                 return -EBUSY;
 963         }
 964
 965         if (!dvbdmxfeed->filter) {
 966                 mutex_unlock(&dvbdmx->mutex);
 967                 return -EINVAL;
 968         }
 969
 970         dvbdmxfeed->feed.sec.tsfeedp = 0;
 971         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 972         dvbdmxfeed->feed.sec.secbufp = 0;
 973         dvbdmxfeed->feed.sec.seclen = 0;
 974
 975         if (!dvbdmx->start_feed) {
 976                 mutex_unlock(&dvbdmx->mutex);
 977                 return -ENODEV;
 978         }
 979
 980         prepare_secfilters(dvbdmxfeed);
 981
 982         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 983                 mutex_unlock(&dvbdmx->mutex);
 984                 return ret;
 985         }
 986
 987         spin_lock_irq(&dvbdmx->lock);
 988         feed->is_filtering = 1;
 989         dvbdmxfeed->state = DMX_STATE_GO;
 990         spin_unlock_irq(&dvbdmx->lock);
 991
 992         mutex_unlock(&dvbdmx->mutex);
 993         return 0;
 994 }
 995
 996 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 997 {
 998         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 999         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1000         int ret;
1001
1002         mutex_lock(&dvbdmx->mutex);
1003
1004         if (!dvbdmx->stop_feed) {
1005                 mutex_unlock(&dvbdmx->mutex);
1006                 return -ENODEV;
1007         }
1008
1009         ret = dvbdmx->stop_feed(dvbdmxfeed);
1010
1011         spin_lock_irq(&dvbdmx->lock);
1012         dvbdmxfeed->state = DMX_STATE_READY;
1013         feed->is_filtering = 0;
1014         spin_unlock_irq(&dvbdmx->lock);
1015
1016         mutex_unlock(&dvbdmx->mutex);
1017         return ret;
1018 }
1019
1020 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
1021                                            struct dmx_section_filter *filter)
1022 {
1023         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
1024         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1025         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1026
1027         mutex_lock(&dvbdmx->mutex);
1028
1029         if (dvbdmxfilter->feed != dvbdmxfeed) {
1030                 mutex_unlock(&dvbdmx->mutex);
1031                 return -EINVAL;
1032         }
1033
1034         if (feed->is_filtering) {
1035                 /* release dvbdmx->mutex as far as it is
1036                    acquired by stop_filtering() itself */
1037                 mutex_unlock(&dvbdmx->mutex);
1038                 feed->stop_filtering(feed);
1039                 mutex_lock(&dvbdmx->mutex);
1040         }
1041
1042         spin_lock_irq(&dvbdmx->lock);
1043         f = dvbdmxfeed->filter;
1044
1045         if (f == dvbdmxfilter) {
1046                 dvbdmxfeed->filter = dvbdmxfilter->next;
1047         } else {
1048                 while (f->next != dvbdmxfilter)
1049                         f = f->next;
1050                 f->next = f->next->next;
1051         }
1052
1053         dvbdmxfilter->state = DMX_STATE_FREE;
1054         spin_unlock_irq(&dvbdmx->lock);
1055         mutex_unlock(&dvbdmx->mutex);
1056         return 0;
1057 }
1058
1059 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1060                                         struct dmx_section_feed **feed,
1061                                         dmx_section_cb callback)
1062 {
1063         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1064         struct dvb_demux_feed *dvbdmxfeed;
1065
1066         if (mutex_lock_interruptible(&dvbdmx->mutex))
1067                 return -ERESTARTSYS;
1068
1069         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1070                 mutex_unlock(&dvbdmx->mutex);
1071                 return -EBUSY;
1072         }
1073
1074         dvbdmxfeed->type = DMX_TYPE_SEC;
1075         dvbdmxfeed->cb.sec = callback;
1076         dvbdmxfeed->demux = dvbdmx;
1077         dvbdmxfeed->pid = 0xffff;
1078         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1079         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1080         dvbdmxfeed->feed.sec.tsfeedp = 0;
1081         dvbdmxfeed->filter = NULL;
1082         dvbdmxfeed->buffer = NULL;
1083
1084         (*feed) = &dvbdmxfeed->feed.sec;
1085         (*feed)->is_filtering = 0;
1086         (*feed)->parent = demux;
1087         (*feed)->priv = NULL;
1088
1089         (*feed)->set = dmx_section_feed_set;
1090         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1091         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1092         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1093         (*feed)->release_filter = dmx_section_feed_release_filter;
1094
1095         mutex_unlock(&dvbdmx->mutex);
1096         return 0;
1097 }
1098
1099 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1100                                        struct dmx_section_feed *feed)
1101 {
1102         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1103         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1104
1105         mutex_lock(&dvbdmx->mutex);
1106
1107         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1108                 mutex_unlock(&dvbdmx->mutex);
1109                 return -EINVAL;
1110         }
1111 #ifndef NOBUFS
1112         vfree(dvbdmxfeed->buffer);
1113         dvbdmxfeed->buffer = NULL;
1114 #endif
1115         dvbdmxfeed->state = DMX_STATE_FREE;
1116
1117         dvb_demux_feed_del(dvbdmxfeed);
1118
1119         dvbdmxfeed->pid = 0xffff;
1120
1121         mutex_unlock(&dvbdmx->mutex);
1122         return 0;
1123 }
1124
1125 /******************************************************************************
1126  * dvb_demux kernel data API calls
1127  ******************************************************************************/
1128
1129 static int dvbdmx_open(struct dmx_demux *demux)
1130 {
1131         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1132
1133         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1134                 return -EUSERS;
1135
1136         dvbdemux->users++;
1137         return 0;
1138 }
1139
1140 static int dvbdmx_close(struct dmx_demux *demux)
1141 {
1142         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1143
1144         if (dvbdemux->users == 0)
1145                 return -ENODEV;
1146
1147         dvbdemux->users--;
1148         //FIXME: release any unneeded resources if users==0
1149         return 0;
1150 }
1151
1152 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1153 {
1154         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1155         void *p;
1156
1157         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1158                 return -EINVAL;
1159
1160         p = memdup_user(buf, count);
1161         if (IS_ERR(p))
1162                 return PTR_ERR(p);
1163         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1164                 kfree(p);
1165                 return -ERESTARTSYS;
1166         }
1167         dvb_dmx_swfilter(dvbdemux, p, count);
1168         kfree(p);
1169         mutex_unlock(&dvbdemux->mutex);
1170
1171         if (signal_pending(current))
1172                 return -EINTR;
1173         return count;
1174 }
1175
1176 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1177                                struct dmx_frontend *frontend)
1178 {
1179         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1180         struct list_head *head = &dvbdemux->frontend_list;
1181
1182         list_add(&(frontend->connectivity_list), head);
1183
1184         return 0;
1185 }
1186
1187 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1188                                   struct dmx_frontend *frontend)
1189 {
1190         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1191         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1192
1193         list_for_each_safe(pos, n, head) {
1194                 if (DMX_FE_ENTRY(pos) == frontend) {
1195                         list_del(pos);
1196                         return 0;
1197                 }
1198         }
1199
1200         return -ENODEV;
1201 }
1202
1203 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1204 {
1205         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1206
1207         if (list_empty(&dvbdemux->frontend_list))
1208                 return NULL;
1209
1210         return &dvbdemux->frontend_list;
1211 }
1212
1213 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1214                                    struct dmx_frontend *frontend)
1215 {
1216         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1217
1218         if (demux->frontend)
1219                 return -EINVAL;
1220
1221         mutex_lock(&dvbdemux->mutex);
1222
1223         demux->frontend = frontend;
1224         mutex_unlock(&dvbdemux->mutex);
1225         return 0;
1226 }
1227
1228 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1229 {
1230         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1231
1232         mutex_lock(&dvbdemux->mutex);
1233
1234         demux->frontend = NULL;
1235         mutex_unlock(&dvbdemux->mutex);
1236         return 0;
1237 }
1238
1239 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1240 {
1241         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1242
1243         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1244         return 0;
1245 }
1246
1247 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1248 {
1249         int i;
1250         struct dmx_demux *dmx = &dvbdemux->dmx;
1251
1252         dvbdemux->cnt_storage = NULL;
1253         dvbdemux->users = 0;
1254         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1255
1256         if (!dvbdemux->filter)
1257                 return -ENOMEM;
1258
1259         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1260         if (!dvbdemux->feed) {
1261                 vfree(dvbdemux->filter);
1262                 dvbdemux->filter = NULL;
1263                 return -ENOMEM;
1264         }
1265         for (i = 0; i < dvbdemux->filternum; i++) {
1266                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1267                 dvbdemux->filter[i].index = i;
1268         }
1269         for (i = 0; i < dvbdemux->feednum; i++) {
1270                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1271                 dvbdemux->feed[i].index = i;
1272         }
1273
1274         dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1275         if (!dvbdemux->cnt_storage)
1276                 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
1277
1278         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1279
1280         for (i = 0; i < DMX_PES_OTHER; i++) {
1281                 dvbdemux->pesfilter[i] = NULL;
1282                 dvbdemux->pids[i] = 0xffff;
1283         }
1284
1285         INIT_LIST_HEAD(&dvbdemux->feed_list);
1286
1287         dvbdemux->playing = 0;
1288         dvbdemux->recording = 0;
1289         dvbdemux->tsbufp = 0;
1290
1291         if (!dvbdemux->check_crc32)
1292                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1293
1294         if (!dvbdemux->memcopy)
1295                 dvbdemux->memcopy = dvb_dmx_memcopy;
1296
1297         dmx->frontend = NULL;
1298         dmx->priv = dvbdemux;
1299         dmx->open = dvbdmx_open;
1300         dmx->close = dvbdmx_close;
1301         dmx->write = dvbdmx_write;
1302         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1303         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1304         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1305         dmx->release_section_feed = dvbdmx_release_section_feed;
1306
1307         dmx->add_frontend = dvbdmx_add_frontend;
1308         dmx->remove_frontend = dvbdmx_remove_frontend;
1309         dmx->get_frontends = dvbdmx_get_frontends;
1310         dmx->connect_frontend = dvbdmx_connect_frontend;
1311         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1312         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1313
1314         mutex_init(&dvbdemux->mutex);
1315         spin_lock_init(&dvbdemux->lock);
1316
1317         return 0;
1318 }
1319
1320 EXPORT_SYMBOL(dvb_dmx_init);
1321
1322 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1323 {
1324         vfree(dvbdemux->cnt_storage);
1325         vfree(dvbdemux->filter);
1326         vfree(dvbdemux->feed);
1327 }
1328
1329 EXPORT_SYMBOL(dvb_dmx_release);