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

   1 /*
   2  * dvb_demux.c - DVB kernel demux API
   3  *
   4  * Copyright (C) 2000-2001 Ralph  Metzler <ralph@convergence.de>
   5  *                     & Marcus Metzler <marcus@convergence.de>
   6  *                       for convergence integrated media GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 2.1
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  */
  23
  24 #include <linux/spinlock.h>
  25 #include <linux/slab.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/module.h>
  28 #include <linux/poll.h>
  29 #include <linux/string.h>
  30 #include <linux/crc32.h>
  31 #include <asm/uaccess.h>
  32
  33 #include "dvb_demux.h"
  34
  35 #define NOBUFS
  36 /*
  37 ** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog
  38 */
  39 // #define DVB_DEMUX_SECTION_LOSS_LOG
  40
  41 /******************************************************************************
  42  * static inlined helper functions
  43  ******************************************************************************/
  44
  45 static inline u16 section_length(const u8 *buf)
  46 {
  47         return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
  48 }
  49
  50 static inline u16 ts_pid(const u8 *buf)
  51 {
  52         return ((buf[1] & 0x1f) << 8) + buf[2];
  53 }
  54
  55 static inline u8 payload(const u8 *tsp)
  56 {
  57         if (!(tsp[3] & 0x10))   // no payload?
  58                 return 0;
  59
  60         if (tsp[3] & 0x20) {    // adaptation field?
  61                 if (tsp[4] > 183)       // corrupted data?
  62                         return 0;
  63                 else
  64                         return 184 - 1 - tsp[4];
  65         }
  66
  67         return 184;
  68 }
  69
  70 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
  71 {
  72         return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
  73 }
  74
  75 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
  76                             size_t len)
  77 {
  78         memcpy(d, s, len);
  79 }
  80
  81 /******************************************************************************
  82  * Software filter functions
  83  ******************************************************************************/
  84
  85 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
  86                                            const u8 *buf)
  87 {
  88         int count = payload(buf);
  89         int p;
  90         //int ccok;
  91         //u8 cc;
  92
  93         if (count == 0)
  94                 return -1;
  95
  96         p = 188 - count;
  97
  98         /*
  99         cc = buf[3] & 0x0f;
 100         ccok = ((feed->cc + 1) & 0x0f) == cc;
 101         feed->cc = cc;
 102         if (!ccok)
 103                 printk("missed packet!\n");
 104         */
 105
 106         if (buf[1] & 0x40)      // PUSI ?
 107                 feed->peslen = 0xfffa;
 108
 109         feed->peslen += count;
 110
 111         return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
 112 }
 113
 114 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 115                                           struct dvb_demux_filter *f)
 116 {
 117         u8 neq = 0;
 118         int i;
 119
 120         for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 121                 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 122
 123                 if (f->maskandmode[i] & xor)
 124                         return 0;
 125
 126                 neq |= f->maskandnotmode[i] & xor;
 127         }
 128
 129         if (f->doneq && !neq)
 130                 return 0;
 131
 132         return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 133                             NULL, 0, &f->filter, DMX_OK);
 134 }
 135
 136 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 137 {
 138         struct dvb_demux *demux = feed->demux;
 139         struct dvb_demux_filter *f = feed->filter;
 140         struct dmx_section_feed *sec = &feed->feed.sec;
 141         int section_syntax_indicator;
 142
 143         if (!sec->is_filtering)
 144                 return 0;
 145
 146         if (!f)
 147                 return 0;
 148
 149         if (sec->check_crc) {
 150                 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 151                 if (section_syntax_indicator &&
 152                     demux->check_crc32(feed, sec->secbuf, sec->seclen))
 153                         return -1;
 154         }
 155
 156         do {
 157                 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 158                         return -1;
 159         } while ((f = f->next) && sec->is_filtering);
 160
 161         sec->seclen = 0;
 162
 163         return 0;
 164 }
 165
 166 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 167 {
 168         struct dmx_section_feed *sec = &feed->feed.sec;
 169
 170 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 171         if (sec->secbufp < sec->tsfeedp) {
 172                 int i, n = sec->tsfeedp - sec->secbufp;
 173
 174                 /*
 175                  * Section padding is done with 0xff bytes entirely.
 176                  * Due to speed reasons, we won't check all of them
 177                  * but just first and last.
 178                  */
 179                 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 180                         printk("dvb_demux.c section ts padding loss: %d/%d\n",
 181                                n, sec->tsfeedp);
 182                         printk("dvb_demux.c pad data:");
 183                         for (i = 0; i < n; i++)
 184                                 printk(" %02x", sec->secbuf[i]);
 185                         printk("\n");
 186                 }
 187         }
 188 #endif
 189
 190         sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 191         sec->secbuf = sec->secbuf_base;
 192 }
 193
 194 /*
 195  * Losless Section Demux 1.4.1 by Emard
 196  * Valsecchi Patrick:
 197  *  - middle of section A  (no PUSI)
 198  *  - end of section A and start of section B
 199  *    (with PUSI pointing to the start of the second section)
 200  *
 201  *  In this case, without feed->pusi_seen you'll receive a garbage section
 202  *  consisting of the end of section A. Basically because tsfeedp
 203  *  is incemented and the use=0 condition is not raised
 204  *  when the second packet arrives.
 205  *
 206  * Fix:
 207  * when demux is started, let feed->pusi_seen = 0 to
 208  * prevent initial feeding of garbage from the end of
 209  * previous section. When you for the first time see PUSI=1
 210  * then set feed->pusi_seen = 1
 211  */
 212 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
 213                                               const u8 *buf, u8 len)
 214 {
 215         struct dvb_demux *demux = feed->demux;
 216         struct dmx_section_feed *sec = &feed->feed.sec;
 217         u16 limit, seclen, n;
 218
 219         if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 220                 return 0;
 221
 222         if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 223 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 224                 printk("dvb_demux.c section buffer full loss: %d/%d\n",
 225                        sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 226                        DMX_MAX_SECFEED_SIZE);
 227 #endif
 228                 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 229         }
 230
 231         if (len <= 0)
 232                 return 0;
 233
 234         demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 235         sec->tsfeedp += len;
 236
 237         /*
 238          * Dump all the sections we can find in the data (Emard)
 239          */
 240         limit = sec->tsfeedp;
 241         if (limit > DMX_MAX_SECFEED_SIZE)
 242                 return -1;      /* internal error should never happen */
 243
 244         /* to be sure always set secbuf */
 245         sec->secbuf = sec->secbuf_base + sec->secbufp;
 246
 247         for (n = 0; sec->secbufp + 2 < limit; n++) {
 248                 seclen = section_length(sec->secbuf);
 249                 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 250                     || seclen + sec->secbufp > limit)
 251                         return 0;
 252                 sec->seclen = seclen;
 253                 sec->crc_val = ~0;
 254                 /* dump [secbuf .. secbuf+seclen) */
 255                 if (feed->pusi_seen)
 256                         dvb_dmx_swfilter_section_feed(feed);
 257 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 258                 else
 259                         printk("dvb_demux.c pusi not seen, discarding section data\n");
 260 #endif
 261                 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 262                 sec->secbuf += seclen;  /* redundant but saves pointer arithmetic */
 263         }
 264
 265         return 0;
 266 }
 267
 268 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 269                                            const u8 *buf)
 270 {
 271         u8 p, count;
 272         int ccok, dc_i = 0;
 273         u8 cc;
 274
 275         count = payload(buf);
 276
 277         if (count == 0)         /* count == 0 if no payload or out of range */
 278                 return -1;
 279
 280         p = 188 - count;        /* payload start */
 281
 282         cc = buf[3] & 0x0f;
 283         ccok = ((feed->cc + 1) & 0x0f) == cc;
 284         feed->cc = cc;
 285
 286         if (buf[3] & 0x20) {
 287                 /* adaption field present, check for discontinuity_indicator */
 288                 if ((buf[4] > 0) && (buf[5] & 0x80))
 289                         dc_i = 1;
 290         }
 291
 292         if (!ccok || dc_i) {
 293 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 294                 printk("dvb_demux.c discontinuity detected %d bytes lost\n",
 295                        count);
 296                 /*
 297                  * those bytes under sume circumstances will again be reported
 298                  * in the following dvb_dmx_swfilter_section_new
 299                  */
 300 #endif
 301                 /*
 302                  * Discontinuity detected. Reset pusi_seen = 0 to
 303                  * stop feeding of suspicious data until next PUSI=1 arrives
 304                  */
 305                 feed->pusi_seen = 0;
 306                 dvb_dmx_swfilter_section_new(feed);
 307         }
 308
 309         if (buf[1] & 0x40) {
 310                 /* PUSI=1 (is set), section boundary is here */
 311                 if (count > 1 && buf[p] < count) {
 312                         const u8 *before = &buf[p + 1];
 313                         u8 before_len = buf[p];
 314                         const u8 *after = &before[before_len];
 315                         u8 after_len = count - 1 - before_len;
 316
 317                         dvb_dmx_swfilter_section_copy_dump(feed, before,
 318                                                            before_len);
 319                         /* before start of new section, set pusi_seen = 1 */
 320                         feed->pusi_seen = 1;
 321                         dvb_dmx_swfilter_section_new(feed);
 322                         dvb_dmx_swfilter_section_copy_dump(feed, after,
 323                                                            after_len);
 324                 }
 325 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 326                 else if (count > 0)
 327                         printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
 328 #endif
 329         } else {
 330                 /* PUSI=0 (is not set), no section boundary */
 331                 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 332         }
 333
 334         return 0;
 335 }
 336
 337 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 338                                                 const u8 *buf)
 339 {
 340         switch (feed->type) {
 341         case DMX_TYPE_TS:
 342                 if (!feed->feed.ts.is_filtering)
 343                         break;
 344                 if (feed->ts_type & TS_PACKET) {
 345                         if (feed->ts_type & TS_PAYLOAD_ONLY)
 346                                 dvb_dmx_swfilter_payload(feed, buf);
 347                         else
 348                                 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
 349                                             DMX_OK);
 350                 }
 351                 if (feed->ts_type & TS_DECODER)
 352                         if (feed->demux->write_to_decoder)
 353                                 feed->demux->write_to_decoder(feed, buf, 188);
 354                 break;
 355
 356         case DMX_TYPE_SEC:
 357                 if (!feed->feed.sec.is_filtering)
 358                         break;
 359                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 360                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 361                 break;
 362
 363         default:
 364                 break;
 365         }
 366 }
 367
 368 #define DVR_FEED(f)                                                     \
 369         (((f)->type == DMX_TYPE_TS) &&                                  \
 370         ((f)->feed.ts.is_filtering) &&                                  \
 371         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 372
 373 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 374 {
 375         struct dvb_demux_feed *feed;
 376         u16 pid = ts_pid(buf);
 377         int dvr_done = 0;
 378
 379         list_for_each_entry(feed, &demux->feed_list, list_head) {
 380                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 381                         continue;
 382
 383                 /* copy each packet only once to the dvr device, even
 384                  * if a PID is in multiple filters (e.g. video + PCR) */
 385                 if ((DVR_FEED(feed)) && (dvr_done++))
 386                         continue;
 387
 388                 if (feed->pid == pid) {
 389                         dvb_dmx_swfilter_packet_type(feed, buf);
 390                         if (DVR_FEED(feed))
 391                                 continue;
 392                 }
 393
 394                 if (feed->pid == 0x2000)
 395                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
 396         }
 397 }
 398
 399 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 400                               size_t count)
 401 {
 402         unsigned long flags;
 403
 404         spin_lock_irqsave(&demux->lock, flags);
 405
 406         while (count--) {
 407                 if (buf[0] == 0x47)
 408                         dvb_dmx_swfilter_packet(demux, buf);
 409                 buf += 188;
 410         }
 411
 412         spin_unlock_irqrestore(&demux->lock, flags);
 413 }
 414
 415 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 416
 417 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 418 {
 419         unsigned long flags;
 420         int p = 0, i, j;
 421
 422         spin_lock_irqsave(&demux->lock, flags);
 423
 424         if (demux->tsbufp) {
 425                 i = demux->tsbufp;
 426                 j = 188 - i;
 427                 if (count < j) {
 428                         memcpy(&demux->tsbuf[i], buf, count);
 429                         demux->tsbufp += count;
 430                         goto bailout;
 431                 }
 432                 memcpy(&demux->tsbuf[i], buf, j);
 433                 if (demux->tsbuf[0] == 0x47)
 434                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 435                 demux->tsbufp = 0;
 436                 p += j;
 437         }
 438
 439         while (p < count) {
 440                 if (buf[p] == 0x47) {
 441                         if (count - p >= 188) {
 442                                 dvb_dmx_swfilter_packet(demux, &buf[p]);
 443                                 p += 188;
 444                         } else {
 445                                 i = count - p;
 446                                 memcpy(demux->tsbuf, &buf[p], i);
 447                                 demux->tsbufp = i;
 448                                 goto bailout;
 449                         }
 450                 } else
 451                         p++;
 452         }
 453
 454 bailout:
 455         spin_unlock_irqrestore(&demux->lock, flags);
 456 }
 457
 458 EXPORT_SYMBOL(dvb_dmx_swfilter);
 459
 460 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 461 {
 462         unsigned long flags;
 463         int p = 0, i, j;
 464         u8 tmppack[188];
 465
 466         spin_lock_irqsave(&demux->lock, flags);
 467
 468         if (demux->tsbufp) {
 469                 i = demux->tsbufp;
 470                 j = 204 - i;
 471                 if (count < j) {
 472                         memcpy(&demux->tsbuf[i], buf, count);
 473                         demux->tsbufp += count;
 474                         goto bailout;
 475                 }
 476                 memcpy(&demux->tsbuf[i], buf, j);
 477                 if ((demux->tsbuf[0] == 0x47) || (demux->tsbuf[0] == 0xB8)) {
 478                         memcpy(tmppack, demux->tsbuf, 188);
 479                         if (tmppack[0] == 0xB8)
 480                                 tmppack[0] = 0x47;
 481                         dvb_dmx_swfilter_packet(demux, tmppack);
 482                 }
 483                 demux->tsbufp = 0;
 484                 p += j;
 485         }
 486
 487         while (p < count) {
 488                 if ((buf[p] == 0x47) || (buf[p] == 0xB8)) {
 489                         if (count - p >= 204) {
 490                                 memcpy(tmppack, &buf[p], 188);
 491                                 if (tmppack[0] == 0xB8)
 492                                         tmppack[0] = 0x47;
 493                                 dvb_dmx_swfilter_packet(demux, tmppack);
 494                                 p += 204;
 495                         } else {
 496                                 i = count - p;
 497                                 memcpy(demux->tsbuf, &buf[p], i);
 498                                 demux->tsbufp = i;
 499                                 goto bailout;
 500                         }
 501                 } else {
 502                         p++;
 503                 }
 504         }
 505
 506 bailout:
 507         spin_unlock_irqrestore(&demux->lock, flags);
 508 }
 509
 510 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 511
 512 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 513 {
 514         int i;
 515
 516         for (i = 0; i < demux->filternum; i++)
 517                 if (demux->filter[i].state == DMX_STATE_FREE)
 518                         break;
 519
 520         if (i == demux->filternum)
 521                 return NULL;
 522
 523         demux->filter[i].state = DMX_STATE_ALLOCATED;
 524
 525         return &demux->filter[i];
 526 }
 527
 528 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 529 {
 530         int i;
 531
 532         for (i = 0; i < demux->feednum; i++)
 533                 if (demux->feed[i].state == DMX_STATE_FREE)
 534                         break;
 535
 536         if (i == demux->feednum)
 537                 return NULL;
 538
 539         demux->feed[i].state = DMX_STATE_ALLOCATED;
 540
 541         return &demux->feed[i];
 542 }
 543
 544 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 545 {
 546         struct dvb_demux_feed *entry;
 547
 548         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 549                 if (entry == feed)
 550                         return 1;
 551
 552         return 0;
 553 }
 554
 555 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 556 {
 557         spin_lock_irq(&feed->demux->lock);
 558         if (dvb_demux_feed_find(feed)) {
 559                 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
 560                        __func__, feed->type, feed->state, feed->pid);
 561                 goto out;
 562         }
 563
 564         list_add(&feed->list_head, &feed->demux->feed_list);
 565 out:
 566         spin_unlock_irq(&feed->demux->lock);
 567 }
 568
 569 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 570 {
 571         spin_lock_irq(&feed->demux->lock);
 572         if (!(dvb_demux_feed_find(feed))) {
 573                 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
 574                        __func__, feed->type, feed->state, feed->pid);
 575                 goto out;
 576         }
 577
 578         list_del(&feed->list_head);
 579 out:
 580         spin_unlock_irq(&feed->demux->lock);
 581 }
 582
 583 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 584                            enum dmx_ts_pes pes_type,
 585                            size_t circular_buffer_size, struct timespec timeout)
 586 {
 587         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 588         struct dvb_demux *demux = feed->demux;
 589
 590         if (pid > DMX_MAX_PID)
 591                 return -EINVAL;
 592
 593         if (mutex_lock_interruptible(&demux->mutex))
 594                 return -ERESTARTSYS;
 595
 596         if (ts_type & TS_DECODER) {
 597                 if (pes_type >= DMX_TS_PES_OTHER) {
 598                         mutex_unlock(&demux->mutex);
 599                         return -EINVAL;
 600                 }
 601
 602                 if (demux->pesfilter[pes_type] &&
 603                     demux->pesfilter[pes_type] != feed) {
 604                         mutex_unlock(&demux->mutex);
 605                         return -EINVAL;
 606                 }
 607
 608                 demux->pesfilter[pes_type] = feed;
 609                 demux->pids[pes_type] = pid;
 610         }
 611
 612         dvb_demux_feed_add(feed);
 613
 614         feed->pid = pid;
 615         feed->buffer_size = circular_buffer_size;
 616         feed->timeout = timeout;
 617         feed->ts_type = ts_type;
 618         feed->pes_type = pes_type;
 619
 620         if (feed->buffer_size) {
 621 #ifdef NOBUFS
 622                 feed->buffer = NULL;
 623 #else
 624                 feed->buffer = vmalloc(feed->buffer_size);
 625                 if (!feed->buffer) {
 626                         mutex_unlock(&demux->mutex);
 627                         return -ENOMEM;
 628                 }
 629 #endif
 630         }
 631
 632         feed->state = DMX_STATE_READY;
 633         mutex_unlock(&demux->mutex);
 634
 635         return 0;
 636 }
 637
 638 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 639 {
 640         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 641         struct dvb_demux *demux = feed->demux;
 642         int ret;
 643
 644         if (mutex_lock_interruptible(&demux->mutex))
 645                 return -ERESTARTSYS;
 646
 647         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 648                 mutex_unlock(&demux->mutex);
 649                 return -EINVAL;
 650         }
 651
 652         if (!demux->start_feed) {
 653                 mutex_unlock(&demux->mutex);
 654                 return -ENODEV;
 655         }
 656
 657         if ((ret = demux->start_feed(feed)) < 0) {
 658                 mutex_unlock(&demux->mutex);
 659                 return ret;
 660         }
 661
 662         spin_lock_irq(&demux->lock);
 663         ts_feed->is_filtering = 1;
 664         feed->state = DMX_STATE_GO;
 665         spin_unlock_irq(&demux->lock);
 666         mutex_unlock(&demux->mutex);
 667
 668         return 0;
 669 }
 670
 671 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 672 {
 673         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 674         struct dvb_demux *demux = feed->demux;
 675         int ret;
 676
 677         mutex_lock(&demux->mutex);
 678
 679         if (feed->state < DMX_STATE_GO) {
 680                 mutex_unlock(&demux->mutex);
 681                 return -EINVAL;
 682         }
 683
 684         if (!demux->stop_feed) {
 685                 mutex_unlock(&demux->mutex);
 686                 return -ENODEV;
 687         }
 688
 689         ret = demux->stop_feed(feed);
 690
 691         spin_lock_irq(&demux->lock);
 692         ts_feed->is_filtering = 0;
 693         feed->state = DMX_STATE_ALLOCATED;
 694         spin_unlock_irq(&demux->lock);
 695         mutex_unlock(&demux->mutex);
 696
 697         return ret;
 698 }
 699
 700 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 701                                    struct dmx_ts_feed **ts_feed,
 702                                    dmx_ts_cb callback)
 703 {
 704         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 705         struct dvb_demux_feed *feed;
 706
 707         if (mutex_lock_interruptible(&demux->mutex))
 708                 return -ERESTARTSYS;
 709
 710         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 711                 mutex_unlock(&demux->mutex);
 712                 return -EBUSY;
 713         }
 714
 715         feed->type = DMX_TYPE_TS;
 716         feed->cb.ts = callback;
 717         feed->demux = demux;
 718         feed->pid = 0xffff;
 719         feed->peslen = 0xfffa;
 720         feed->buffer = NULL;
 721
 722         (*ts_feed) = &feed->feed.ts;
 723         (*ts_feed)->parent = dmx;
 724         (*ts_feed)->priv = NULL;
 725         (*ts_feed)->is_filtering = 0;
 726         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 727         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 728         (*ts_feed)->set = dmx_ts_feed_set;
 729
 730         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 731                 feed->state = DMX_STATE_FREE;
 732                 mutex_unlock(&demux->mutex);
 733                 return -EBUSY;
 734         }
 735
 736         feed->filter->type = DMX_TYPE_TS;
 737         feed->filter->feed = feed;
 738         feed->filter->state = DMX_STATE_READY;
 739
 740         mutex_unlock(&demux->mutex);
 741
 742         return 0;
 743 }
 744
 745 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 746                                   struct dmx_ts_feed *ts_feed)
 747 {
 748         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 749         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 750
 751         mutex_lock(&demux->mutex);
 752
 753         if (feed->state == DMX_STATE_FREE) {
 754                 mutex_unlock(&demux->mutex);
 755                 return -EINVAL;
 756         }
 757 #ifndef NOBUFS
 758         vfree(feed->buffer);
 759         feed->buffer = NULL;
 760 #endif
 761
 762         feed->state = DMX_STATE_FREE;
 763         feed->filter->state = DMX_STATE_FREE;
 764
 765         dvb_demux_feed_del(feed);
 766
 767         feed->pid = 0xffff;
 768
 769         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_TS_PES_OTHER)
 770                 demux->pesfilter[feed->pes_type] = NULL;
 771
 772         mutex_unlock(&demux->mutex);
 773         return 0;
 774 }
 775
 776 /******************************************************************************
 777  * dmx_section_feed API calls
 778  ******************************************************************************/
 779
 780 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 781                                             struct dmx_section_filter **filter)
 782 {
 783         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 784         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 785         struct dvb_demux_filter *dvbdmxfilter;
 786
 787         if (mutex_lock_interruptible(&dvbdemux->mutex))
 788                 return -ERESTARTSYS;
 789
 790         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 791         if (!dvbdmxfilter) {
 792                 mutex_unlock(&dvbdemux->mutex);
 793                 return -EBUSY;
 794         }
 795
 796         spin_lock_irq(&dvbdemux->lock);
 797         *filter = &dvbdmxfilter->filter;
 798         (*filter)->parent = feed;
 799         (*filter)->priv = NULL;
 800         dvbdmxfilter->feed = dvbdmxfeed;
 801         dvbdmxfilter->type = DMX_TYPE_SEC;
 802         dvbdmxfilter->state = DMX_STATE_READY;
 803         dvbdmxfilter->next = dvbdmxfeed->filter;
 804         dvbdmxfeed->filter = dvbdmxfilter;
 805         spin_unlock_irq(&dvbdemux->lock);
 806
 807         mutex_unlock(&dvbdemux->mutex);
 808         return 0;
 809 }
 810
 811 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 812                                 u16 pid, size_t circular_buffer_size,
 813                                 int check_crc)
 814 {
 815         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 816         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 817
 818         if (pid > 0x1fff)
 819                 return -EINVAL;
 820
 821         if (mutex_lock_interruptible(&dvbdmx->mutex))
 822                 return -ERESTARTSYS;
 823
 824         dvb_demux_feed_add(dvbdmxfeed);
 825
 826         dvbdmxfeed->pid = pid;
 827         dvbdmxfeed->buffer_size = circular_buffer_size;
 828         dvbdmxfeed->feed.sec.check_crc = check_crc;
 829
 830 #ifdef NOBUFS
 831         dvbdmxfeed->buffer = NULL;
 832 #else
 833         dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
 834         if (!dvbdmxfeed->buffer) {
 835                 mutex_unlock(&dvbdmx->mutex);
 836                 return -ENOMEM;
 837         }
 838 #endif
 839
 840         dvbdmxfeed->state = DMX_STATE_READY;
 841         mutex_unlock(&dvbdmx->mutex);
 842         return 0;
 843 }
 844
 845 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 846 {
 847         int i;
 848         struct dvb_demux_filter *f;
 849         struct dmx_section_filter *sf;
 850         u8 mask, mode, doneq;
 851
 852         if (!(f = dvbdmxfeed->filter))
 853                 return;
 854         do {
 855                 sf = &f->filter;
 856                 doneq = 0;
 857                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 858                         mode = sf->filter_mode[i];
 859                         mask = sf->filter_mask[i];
 860                         f->maskandmode[i] = mask & mode;
 861                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 862                 }
 863                 f->doneq = doneq ? 1 : 0;
 864         } while ((f = f->next));
 865 }
 866
 867 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 868 {
 869         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 870         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 871         int ret;
 872
 873         if (mutex_lock_interruptible(&dvbdmx->mutex))
 874                 return -ERESTARTSYS;
 875
 876         if (feed->is_filtering) {
 877                 mutex_unlock(&dvbdmx->mutex);
 878                 return -EBUSY;
 879         }
 880
 881         if (!dvbdmxfeed->filter) {
 882                 mutex_unlock(&dvbdmx->mutex);
 883                 return -EINVAL;
 884         }
 885
 886         dvbdmxfeed->feed.sec.tsfeedp = 0;
 887         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 888         dvbdmxfeed->feed.sec.secbufp = 0;
 889         dvbdmxfeed->feed.sec.seclen = 0;
 890
 891         if (!dvbdmx->start_feed) {
 892                 mutex_unlock(&dvbdmx->mutex);
 893                 return -ENODEV;
 894         }
 895
 896         prepare_secfilters(dvbdmxfeed);
 897
 898         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 899                 mutex_unlock(&dvbdmx->mutex);
 900                 return ret;
 901         }
 902
 903         spin_lock_irq(&dvbdmx->lock);
 904         feed->is_filtering = 1;
 905         dvbdmxfeed->state = DMX_STATE_GO;
 906         spin_unlock_irq(&dvbdmx->lock);
 907
 908         mutex_unlock(&dvbdmx->mutex);
 909         return 0;
 910 }
 911
 912 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 913 {
 914         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 915         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 916         int ret;
 917
 918         mutex_lock(&dvbdmx->mutex);
 919
 920         if (!dvbdmx->stop_feed) {
 921                 mutex_unlock(&dvbdmx->mutex);
 922                 return -ENODEV;
 923         }
 924
 925         ret = dvbdmx->stop_feed(dvbdmxfeed);
 926
 927         spin_lock_irq(&dvbdmx->lock);
 928         dvbdmxfeed->state = DMX_STATE_READY;
 929         feed->is_filtering = 0;
 930         spin_unlock_irq(&dvbdmx->lock);
 931
 932         mutex_unlock(&dvbdmx->mutex);
 933         return ret;
 934 }
 935
 936 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
 937                                            struct dmx_section_filter *filter)
 938 {
 939         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
 940         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 941         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 942
 943         mutex_lock(&dvbdmx->mutex);
 944
 945         if (dvbdmxfilter->feed != dvbdmxfeed) {
 946                 mutex_unlock(&dvbdmx->mutex);
 947                 return -EINVAL;
 948         }
 949
 950         if (feed->is_filtering)
 951                 feed->stop_filtering(feed);
 952
 953         spin_lock_irq(&dvbdmx->lock);
 954         f = dvbdmxfeed->filter;
 955
 956         if (f == dvbdmxfilter) {
 957                 dvbdmxfeed->filter = dvbdmxfilter->next;
 958         } else {
 959                 while (f->next != dvbdmxfilter)
 960                         f = f->next;
 961                 f->next = f->next->next;
 962         }
 963
 964         dvbdmxfilter->state = DMX_STATE_FREE;
 965         spin_unlock_irq(&dvbdmx->lock);
 966         mutex_unlock(&dvbdmx->mutex);
 967         return 0;
 968 }
 969
 970 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
 971                                         struct dmx_section_feed **feed,
 972                                         dmx_section_cb callback)
 973 {
 974         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
 975         struct dvb_demux_feed *dvbdmxfeed;
 976
 977         if (mutex_lock_interruptible(&dvbdmx->mutex))
 978                 return -ERESTARTSYS;
 979
 980         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
 981                 mutex_unlock(&dvbdmx->mutex);
 982                 return -EBUSY;
 983         }
 984
 985         dvbdmxfeed->type = DMX_TYPE_SEC;
 986         dvbdmxfeed->cb.sec = callback;
 987         dvbdmxfeed->demux = dvbdmx;
 988         dvbdmxfeed->pid = 0xffff;
 989         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 990         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
 991         dvbdmxfeed->feed.sec.tsfeedp = 0;
 992         dvbdmxfeed->filter = NULL;
 993         dvbdmxfeed->buffer = NULL;
 994
 995         (*feed) = &dvbdmxfeed->feed.sec;
 996         (*feed)->is_filtering = 0;
 997         (*feed)->parent = demux;
 998         (*feed)->priv = NULL;
 999
1000         (*feed)->set = dmx_section_feed_set;
1001         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1002         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1003         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1004         (*feed)->release_filter = dmx_section_feed_release_filter;
1005
1006         mutex_unlock(&dvbdmx->mutex);
1007         return 0;
1008 }
1009
1010 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1011                                        struct dmx_section_feed *feed)
1012 {
1013         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1014         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1015
1016         mutex_lock(&dvbdmx->mutex);
1017
1018         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1019                 mutex_unlock(&dvbdmx->mutex);
1020                 return -EINVAL;
1021         }
1022 #ifndef NOBUFS
1023         vfree(dvbdmxfeed->buffer);
1024         dvbdmxfeed->buffer = NULL;
1025 #endif
1026         dvbdmxfeed->state = DMX_STATE_FREE;
1027
1028         dvb_demux_feed_del(dvbdmxfeed);
1029
1030         dvbdmxfeed->pid = 0xffff;
1031
1032         mutex_unlock(&dvbdmx->mutex);
1033         return 0;
1034 }
1035
1036 /******************************************************************************
1037  * dvb_demux kernel data API calls
1038  ******************************************************************************/
1039
1040 static int dvbdmx_open(struct dmx_demux *demux)
1041 {
1042         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1043
1044         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1045                 return -EUSERS;
1046
1047         dvbdemux->users++;
1048         return 0;
1049 }
1050
1051 static int dvbdmx_close(struct dmx_demux *demux)
1052 {
1053         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1054
1055         if (dvbdemux->users == 0)
1056                 return -ENODEV;
1057
1058         dvbdemux->users--;
1059         //FIXME: release any unneeded resources if users==0
1060         return 0;
1061 }
1062
1063 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1064 {
1065         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1066         void *p;
1067
1068         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1069                 return -EINVAL;
1070
1071         p = kmalloc(count, GFP_USER);
1072         if (!p)
1073                 return -ENOMEM;
1074         if (copy_from_user(p, buf, count)) {
1075                 kfree(p);
1076                 return -EFAULT;
1077         }
1078         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1079                 kfree(p);
1080                 return -ERESTARTSYS;
1081         }
1082         dvb_dmx_swfilter(dvbdemux, p, count);
1083         kfree(p);
1084         mutex_unlock(&dvbdemux->mutex);
1085
1086         if (signal_pending(current))
1087                 return -EINTR;
1088         return count;
1089 }
1090
1091 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1092                                struct dmx_frontend *frontend)
1093 {
1094         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1095         struct list_head *head = &dvbdemux->frontend_list;
1096
1097         list_add(&(frontend->connectivity_list), head);
1098
1099         return 0;
1100 }
1101
1102 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1103                                   struct dmx_frontend *frontend)
1104 {
1105         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1106         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1107
1108         list_for_each_safe(pos, n, head) {
1109                 if (DMX_FE_ENTRY(pos) == frontend) {
1110                         list_del(pos);
1111                         return 0;
1112                 }
1113         }
1114
1115         return -ENODEV;
1116 }
1117
1118 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1119 {
1120         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1121
1122         if (list_empty(&dvbdemux->frontend_list))
1123                 return NULL;
1124
1125         return &dvbdemux->frontend_list;
1126 }
1127
1128 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1129                                    struct dmx_frontend *frontend)
1130 {
1131         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1132
1133         if (demux->frontend)
1134                 return -EINVAL;
1135
1136         mutex_lock(&dvbdemux->mutex);
1137
1138         demux->frontend = frontend;
1139         mutex_unlock(&dvbdemux->mutex);
1140         return 0;
1141 }
1142
1143 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1144 {
1145         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1146
1147         mutex_lock(&dvbdemux->mutex);
1148
1149         demux->frontend = NULL;
1150         mutex_unlock(&dvbdemux->mutex);
1151         return 0;
1152 }
1153
1154 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1155 {
1156         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1157
1158         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1159         return 0;
1160 }
1161
1162 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1163 {
1164         int i;
1165         struct dmx_demux *dmx = &dvbdemux->dmx;
1166
1167         dvbdemux->users = 0;
1168         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1169
1170         if (!dvbdemux->filter)
1171                 return -ENOMEM;
1172
1173         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1174         if (!dvbdemux->feed) {
1175                 vfree(dvbdemux->filter);
1176                 return -ENOMEM;
1177         }
1178         for (i = 0; i < dvbdemux->filternum; i++) {
1179                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1180                 dvbdemux->filter[i].index = i;
1181         }
1182         for (i = 0; i < dvbdemux->feednum; i++) {
1183                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1184                 dvbdemux->feed[i].index = i;
1185         }
1186
1187         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1188
1189         for (i = 0; i < DMX_TS_PES_OTHER; i++) {
1190                 dvbdemux->pesfilter[i] = NULL;
1191                 dvbdemux->pids[i] = 0xffff;
1192         }
1193
1194         INIT_LIST_HEAD(&dvbdemux->feed_list);
1195
1196         dvbdemux->playing = 0;
1197         dvbdemux->recording = 0;
1198         dvbdemux->tsbufp = 0;
1199
1200         if (!dvbdemux->check_crc32)
1201                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1202
1203         if (!dvbdemux->memcopy)
1204                 dvbdemux->memcopy = dvb_dmx_memcopy;
1205
1206         dmx->frontend = NULL;
1207         dmx->priv = dvbdemux;
1208         dmx->open = dvbdmx_open;
1209         dmx->close = dvbdmx_close;
1210         dmx->write = dvbdmx_write;
1211         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1212         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1213         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1214         dmx->release_section_feed = dvbdmx_release_section_feed;
1215
1216         dmx->add_frontend = dvbdmx_add_frontend;
1217         dmx->remove_frontend = dvbdmx_remove_frontend;
1218         dmx->get_frontends = dvbdmx_get_frontends;
1219         dmx->connect_frontend = dvbdmx_connect_frontend;
1220         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1221         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1222
1223         mutex_init(&dvbdemux->mutex);
1224         spin_lock_init(&dvbdemux->lock);
1225
1226         return 0;
1227 }
1228
1229 EXPORT_SYMBOL(dvb_dmx_init);
1230
1231 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1232 {
1233         vfree(dvbdemux->filter);
1234         vfree(dvbdemux->feed);
1235 }
1236
1237 EXPORT_SYMBOL(dvb_dmx_release);