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 static int dvb_demux_tscheck;
  42 module_param(dvb_demux_tscheck, int, 0644);
  43 MODULE_PARM_DESC(dvb_demux_tscheck,
  44                 "enable transport stream continuity and TEI check");
  45
  46 #define dprintk_tscheck(x...) do {                              \
  47                 if (dvb_demux_tscheck && printk_ratelimit())    \
  48                         printk(x);                              \
  49         } while (0)
  50
  51 /******************************************************************************
  52  * static inlined helper functions
  53  ******************************************************************************/
  54
  55 static inline u16 section_length(const u8 *buf)
  56 {
  57         return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
  58 }
  59
  60 static inline u16 ts_pid(const u8 *buf)
  61 {
  62         return ((buf[1] & 0x1f) << 8) + buf[2];
  63 }
  64
  65 static inline u8 payload(const u8 *tsp)
  66 {
  67         if (!(tsp[3] & 0x10))   // no payload?
  68                 return 0;
  69
  70         if (tsp[3] & 0x20) {    // adaptation field?
  71                 if (tsp[4] > 183)       // corrupted data?
  72                         return 0;
  73                 else
  74                         return 184 - 1 - tsp[4];
  75         }
  76
  77         return 184;
  78 }
  79
  80 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
  81 {
  82         return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
  83 }
  84
  85 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
  86                             size_t len)
  87 {
  88         memcpy(d, s, len);
  89 }
  90
  91 /******************************************************************************
  92  * Software filter functions
  93  ******************************************************************************/
  94
  95 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
  96                                            const u8 *buf)
  97 {
  98         int count = payload(buf);
  99         int p;
 100         //int ccok;
 101         //u8 cc;
 102
 103         if (count == 0)
 104                 return -1;
 105
 106         p = 188 - count;
 107
 108         /*
 109         cc = buf[3] & 0x0f;
 110         ccok = ((feed->cc + 1) & 0x0f) == cc;
 111         feed->cc = cc;
 112         if (!ccok)
 113                 printk("missed packet!\n");
 114         */
 115
 116         if (buf[1] & 0x40)      // PUSI ?
 117                 feed->peslen = 0xfffa;
 118
 119         feed->peslen += count;
 120
 121         return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
 122 }
 123
 124 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 125                                           struct dvb_demux_filter *f)
 126 {
 127         u8 neq = 0;
 128         int i;
 129
 130         for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 131                 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 132
 133                 if (f->maskandmode[i] & xor)
 134                         return 0;
 135
 136                 neq |= f->maskandnotmode[i] & xor;
 137         }
 138
 139         if (f->doneq && !neq)
 140                 return 0;
 141
 142         return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 143                             NULL, 0, &f->filter, DMX_OK);
 144 }
 145
 146 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 147 {
 148         struct dvb_demux *demux = feed->demux;
 149         struct dvb_demux_filter *f = feed->filter;
 150         struct dmx_section_feed *sec = &feed->feed.sec;
 151         int section_syntax_indicator;
 152
 153         if (!sec->is_filtering)
 154                 return 0;
 155
 156         if (!f)
 157                 return 0;
 158
 159         if (sec->check_crc) {
 160                 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 161                 if (section_syntax_indicator &&
 162                     demux->check_crc32(feed, sec->secbuf, sec->seclen))
 163                         return -1;
 164         }
 165
 166         do {
 167                 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 168                         return -1;
 169         } while ((f = f->next) && sec->is_filtering);
 170
 171         sec->seclen = 0;
 172
 173         return 0;
 174 }
 175
 176 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 177 {
 178         struct dmx_section_feed *sec = &feed->feed.sec;
 179
 180 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 181         if (sec->secbufp < sec->tsfeedp) {
 182                 int i, n = sec->tsfeedp - sec->secbufp;
 183
 184                 /*
 185                  * Section padding is done with 0xff bytes entirely.
 186                  * Due to speed reasons, we won't check all of them
 187                  * but just first and last.
 188                  */
 189                 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 190                         printk("dvb_demux.c section ts padding loss: %d/%d\n",
 191                                n, sec->tsfeedp);
 192                         printk("dvb_demux.c pad data:");
 193                         for (i = 0; i < n; i++)
 194                                 printk(" %02x", sec->secbuf[i]);
 195                         printk("\n");
 196                 }
 197         }
 198 #endif
 199
 200         sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 201         sec->secbuf = sec->secbuf_base;
 202 }
 203
 204 /*
 205  * Losless Section Demux 1.4.1 by Emard
 206  * Valsecchi Patrick:
 207  *  - middle of section A  (no PUSI)
 208  *  - end of section A and start of section B
 209  *    (with PUSI pointing to the start of the second section)
 210  *
 211  *  In this case, without feed->pusi_seen you'll receive a garbage section
 212  *  consisting of the end of section A. Basically because tsfeedp
 213  *  is incemented and the use=0 condition is not raised
 214  *  when the second packet arrives.
 215  *
 216  * Fix:
 217  * when demux is started, let feed->pusi_seen = 0 to
 218  * prevent initial feeding of garbage from the end of
 219  * previous section. When you for the first time see PUSI=1
 220  * then set feed->pusi_seen = 1
 221  */
 222 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
 223                                               const u8 *buf, u8 len)
 224 {
 225         struct dvb_demux *demux = feed->demux;
 226         struct dmx_section_feed *sec = &feed->feed.sec;
 227         u16 limit, seclen, n;
 228
 229         if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 230                 return 0;
 231
 232         if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 233 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 234                 printk("dvb_demux.c section buffer full loss: %d/%d\n",
 235                        sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 236                        DMX_MAX_SECFEED_SIZE);
 237 #endif
 238                 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 239         }
 240
 241         if (len <= 0)
 242                 return 0;
 243
 244         demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 245         sec->tsfeedp += len;
 246
 247         /*
 248          * Dump all the sections we can find in the data (Emard)
 249          */
 250         limit = sec->tsfeedp;
 251         if (limit > DMX_MAX_SECFEED_SIZE)
 252                 return -1;      /* internal error should never happen */
 253
 254         /* to be sure always set secbuf */
 255         sec->secbuf = sec->secbuf_base + sec->secbufp;
 256
 257         for (n = 0; sec->secbufp + 2 < limit; n++) {
 258                 seclen = section_length(sec->secbuf);
 259                 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 260                     || seclen + sec->secbufp > limit)
 261                         return 0;
 262                 sec->seclen = seclen;
 263                 sec->crc_val = ~0;
 264                 /* dump [secbuf .. secbuf+seclen) */
 265                 if (feed->pusi_seen)
 266                         dvb_dmx_swfilter_section_feed(feed);
 267 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 268                 else
 269                         printk("dvb_demux.c pusi not seen, discarding section data\n");
 270 #endif
 271                 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 272                 sec->secbuf += seclen;  /* redundant but saves pointer arithmetic */
 273         }
 274
 275         return 0;
 276 }
 277
 278 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 279                                            const u8 *buf)
 280 {
 281         u8 p, count;
 282         int ccok, dc_i = 0;
 283         u8 cc;
 284
 285         count = payload(buf);
 286
 287         if (count == 0)         /* count == 0 if no payload or out of range */
 288                 return -1;
 289
 290         p = 188 - count;        /* payload start */
 291
 292         cc = buf[3] & 0x0f;
 293         ccok = ((feed->cc + 1) & 0x0f) == cc;
 294         feed->cc = cc;
 295
 296         if (buf[3] & 0x20) {
 297                 /* adaption field present, check for discontinuity_indicator */
 298                 if ((buf[4] > 0) && (buf[5] & 0x80))
 299                         dc_i = 1;
 300         }
 301
 302         if (!ccok || dc_i) {
 303 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 304                 printk("dvb_demux.c discontinuity detected %d bytes lost\n",
 305                        count);
 306                 /*
 307                  * those bytes under sume circumstances will again be reported
 308                  * in the following dvb_dmx_swfilter_section_new
 309                  */
 310 #endif
 311                 /*
 312                  * Discontinuity detected. Reset pusi_seen = 0 to
 313                  * stop feeding of suspicious data until next PUSI=1 arrives
 314                  */
 315                 feed->pusi_seen = 0;
 316                 dvb_dmx_swfilter_section_new(feed);
 317         }
 318
 319         if (buf[1] & 0x40) {
 320                 /* PUSI=1 (is set), section boundary is here */
 321                 if (count > 1 && buf[p] < count) {
 322                         const u8 *before = &buf[p + 1];
 323                         u8 before_len = buf[p];
 324                         const u8 *after = &before[before_len];
 325                         u8 after_len = count - 1 - before_len;
 326
 327                         dvb_dmx_swfilter_section_copy_dump(feed, before,
 328                                                            before_len);
 329                         /* before start of new section, set pusi_seen = 1 */
 330                         feed->pusi_seen = 1;
 331                         dvb_dmx_swfilter_section_new(feed);
 332                         dvb_dmx_swfilter_section_copy_dump(feed, after,
 333                                                            after_len);
 334                 }
 335 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 336                 else if (count > 0)
 337                         printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
 338 #endif
 339         } else {
 340                 /* PUSI=0 (is not set), no section boundary */
 341                 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 342         }
 343
 344         return 0;
 345 }
 346
 347 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 348                                                 const u8 *buf)
 349 {
 350         switch (feed->type) {
 351         case DMX_TYPE_TS:
 352                 if (!feed->feed.ts.is_filtering)
 353                         break;
 354                 if (feed->ts_type & TS_PACKET) {
 355                         if (feed->ts_type & TS_PAYLOAD_ONLY)
 356                                 dvb_dmx_swfilter_payload(feed, buf);
 357                         else
 358                                 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
 359                                             DMX_OK);
 360                 }
 361                 if (feed->ts_type & TS_DECODER)
 362                         if (feed->demux->write_to_decoder)
 363                                 feed->demux->write_to_decoder(feed, buf, 188);
 364                 break;
 365
 366         case DMX_TYPE_SEC:
 367                 if (!feed->feed.sec.is_filtering)
 368                         break;
 369                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 370                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 371                 break;
 372
 373         default:
 374                 break;
 375         }
 376 }
 377
 378 #define DVR_FEED(f)                                                     \
 379         (((f)->type == DMX_TYPE_TS) &&                                  \
 380         ((f)->feed.ts.is_filtering) &&                                  \
 381         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 382
 383 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 384 {
 385         struct dvb_demux_feed *feed;
 386         u16 pid = ts_pid(buf);
 387         int dvr_done = 0;
 388
 389         if (dvb_demux_tscheck) {
 390                 if (!demux->cnt_storage)
 391                         demux->cnt_storage = vmalloc(MAX_PID + 1);
 392
 393                 if (!demux->cnt_storage) {
 394                         printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
 395                         dvb_demux_tscheck = 0;
 396                         goto no_dvb_demux_tscheck;
 397                 }
 398
 399                 /* check pkt counter */
 400                 if (pid < MAX_PID) {
 401                         if (buf[1] & 0x80)
 402                                 dprintk_tscheck("TEI detected. "
 403                                                 "PID=0x%x data1=0x%x\n",
 404                                                 pid, buf[1]);
 405
 406                         if ((buf[3] & 0xf) != demux->cnt_storage[pid])
 407                                 dprintk_tscheck("TS packet counter mismatch. "
 408                                                 "PID=0x%x expected 0x%x "
 409                                                 "got 0x%x\n",
 410                                                 pid, demux->cnt_storage[pid],
 411                                                 buf[3] & 0xf);
 412
 413                         demux->cnt_storage[pid] = ((buf[3] & 0xf) + 1)&0xf;
 414                 };
 415                 /* end check */
 416         };
 417 no_dvb_demux_tscheck:
 418
 419         list_for_each_entry(feed, &demux->feed_list, list_head) {
 420                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 421                         continue;
 422
 423                 /* copy each packet only once to the dvr device, even
 424                  * if a PID is in multiple filters (e.g. video + PCR) */
 425                 if ((DVR_FEED(feed)) && (dvr_done++))
 426                         continue;
 427
 428                 if (feed->pid == pid)
 429                         dvb_dmx_swfilter_packet_type(feed, buf);
 430                 else if (feed->pid == 0x2000)
 431                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
 432         }
 433 }
 434
 435 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 436                               size_t count)
 437 {
 438         spin_lock(&demux->lock);
 439
 440         while (count--) {
 441                 if (buf[0] == 0x47)
 442                         dvb_dmx_swfilter_packet(demux, buf);
 443                 buf += 188;
 444         }
 445
 446         spin_unlock(&demux->lock);
 447 }
 448
 449 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 450
 451 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 452 {
 453         int p = 0, i, j;
 454
 455         spin_lock(&demux->lock);
 456
 457         if (demux->tsbufp) {
 458                 i = demux->tsbufp;
 459                 j = 188 - i;
 460                 if (count < j) {
 461                         memcpy(&demux->tsbuf[i], buf, count);
 462                         demux->tsbufp += count;
 463                         goto bailout;
 464                 }
 465                 memcpy(&demux->tsbuf[i], buf, j);
 466                 if (demux->tsbuf[0] == 0x47)
 467                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 468                 demux->tsbufp = 0;
 469                 p += j;
 470         }
 471
 472         while (p < count) {
 473                 if (buf[p] == 0x47) {
 474                         if (count - p >= 188) {
 475                                 dvb_dmx_swfilter_packet(demux, &buf[p]);
 476                                 p += 188;
 477                         } else {
 478                                 i = count - p;
 479                                 memcpy(demux->tsbuf, &buf[p], i);
 480                                 demux->tsbufp = i;
 481                                 goto bailout;
 482                         }
 483                 } else
 484                         p++;
 485         }
 486
 487 bailout:
 488         spin_unlock(&demux->lock);
 489 }
 490
 491 EXPORT_SYMBOL(dvb_dmx_swfilter);
 492
 493 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 494 {
 495         int p = 0, i, j;
 496         u8 tmppack[188];
 497
 498         spin_lock(&demux->lock);
 499
 500         if (demux->tsbufp) {
 501                 i = demux->tsbufp;
 502                 j = 204 - i;
 503                 if (count < j) {
 504                         memcpy(&demux->tsbuf[i], buf, count);
 505                         demux->tsbufp += count;
 506                         goto bailout;
 507                 }
 508                 memcpy(&demux->tsbuf[i], buf, j);
 509                 if ((demux->tsbuf[0] == 0x47) || (demux->tsbuf[0] == 0xB8)) {
 510                         memcpy(tmppack, demux->tsbuf, 188);
 511                         if (tmppack[0] == 0xB8)
 512                                 tmppack[0] = 0x47;
 513                         dvb_dmx_swfilter_packet(demux, tmppack);
 514                 }
 515                 demux->tsbufp = 0;
 516                 p += j;
 517         }
 518
 519         while (p < count) {
 520                 if ((buf[p] == 0x47) || (buf[p] == 0xB8)) {
 521                         if (count - p >= 204) {
 522                                 memcpy(tmppack, &buf[p], 188);
 523                                 if (tmppack[0] == 0xB8)
 524                                         tmppack[0] = 0x47;
 525                                 dvb_dmx_swfilter_packet(demux, tmppack);
 526                                 p += 204;
 527                         } else {
 528                                 i = count - p;
 529                                 memcpy(demux->tsbuf, &buf[p], i);
 530                                 demux->tsbufp = i;
 531                                 goto bailout;
 532                         }
 533                 } else {
 534                         p++;
 535                 }
 536         }
 537
 538 bailout:
 539         spin_unlock(&demux->lock);
 540 }
 541
 542 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 543
 544 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 545 {
 546         int i;
 547
 548         for (i = 0; i < demux->filternum; i++)
 549                 if (demux->filter[i].state == DMX_STATE_FREE)
 550                         break;
 551
 552         if (i == demux->filternum)
 553                 return NULL;
 554
 555         demux->filter[i].state = DMX_STATE_ALLOCATED;
 556
 557         return &demux->filter[i];
 558 }
 559
 560 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 561 {
 562         int i;
 563
 564         for (i = 0; i < demux->feednum; i++)
 565                 if (demux->feed[i].state == DMX_STATE_FREE)
 566                         break;
 567
 568         if (i == demux->feednum)
 569                 return NULL;
 570
 571         demux->feed[i].state = DMX_STATE_ALLOCATED;
 572
 573         return &demux->feed[i];
 574 }
 575
 576 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 577 {
 578         struct dvb_demux_feed *entry;
 579
 580         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 581                 if (entry == feed)
 582                         return 1;
 583
 584         return 0;
 585 }
 586
 587 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 588 {
 589         spin_lock_irq(&feed->demux->lock);
 590         if (dvb_demux_feed_find(feed)) {
 591                 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
 592                        __func__, feed->type, feed->state, feed->pid);
 593                 goto out;
 594         }
 595
 596         list_add(&feed->list_head, &feed->demux->feed_list);
 597 out:
 598         spin_unlock_irq(&feed->demux->lock);
 599 }
 600
 601 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 602 {
 603         spin_lock_irq(&feed->demux->lock);
 604         if (!(dvb_demux_feed_find(feed))) {
 605                 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
 606                        __func__, feed->type, feed->state, feed->pid);
 607                 goto out;
 608         }
 609
 610         list_del(&feed->list_head);
 611 out:
 612         spin_unlock_irq(&feed->demux->lock);
 613 }
 614
 615 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 616                            enum dmx_ts_pes pes_type,
 617                            size_t circular_buffer_size, struct timespec timeout)
 618 {
 619         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 620         struct dvb_demux *demux = feed->demux;
 621
 622         if (pid > DMX_MAX_PID)
 623                 return -EINVAL;
 624
 625         if (mutex_lock_interruptible(&demux->mutex))
 626                 return -ERESTARTSYS;
 627
 628         if (ts_type & TS_DECODER) {
 629                 if (pes_type >= DMX_TS_PES_OTHER) {
 630                         mutex_unlock(&demux->mutex);
 631                         return -EINVAL;
 632                 }
 633
 634                 if (demux->pesfilter[pes_type] &&
 635                     demux->pesfilter[pes_type] != feed) {
 636                         mutex_unlock(&demux->mutex);
 637                         return -EINVAL;
 638                 }
 639
 640                 demux->pesfilter[pes_type] = feed;
 641                 demux->pids[pes_type] = pid;
 642         }
 643
 644         dvb_demux_feed_add(feed);
 645
 646         feed->pid = pid;
 647         feed->buffer_size = circular_buffer_size;
 648         feed->timeout = timeout;
 649         feed->ts_type = ts_type;
 650         feed->pes_type = pes_type;
 651
 652         if (feed->buffer_size) {
 653 #ifdef NOBUFS
 654                 feed->buffer = NULL;
 655 #else
 656                 feed->buffer = vmalloc(feed->buffer_size);
 657                 if (!feed->buffer) {
 658                         mutex_unlock(&demux->mutex);
 659                         return -ENOMEM;
 660                 }
 661 #endif
 662         }
 663
 664         feed->state = DMX_STATE_READY;
 665         mutex_unlock(&demux->mutex);
 666
 667         return 0;
 668 }
 669
 670 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 671 {
 672         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 673         struct dvb_demux *demux = feed->demux;
 674         int ret;
 675
 676         if (mutex_lock_interruptible(&demux->mutex))
 677                 return -ERESTARTSYS;
 678
 679         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 680                 mutex_unlock(&demux->mutex);
 681                 return -EINVAL;
 682         }
 683
 684         if (!demux->start_feed) {
 685                 mutex_unlock(&demux->mutex);
 686                 return -ENODEV;
 687         }
 688
 689         if ((ret = demux->start_feed(feed)) < 0) {
 690                 mutex_unlock(&demux->mutex);
 691                 return ret;
 692         }
 693
 694         spin_lock_irq(&demux->lock);
 695         ts_feed->is_filtering = 1;
 696         feed->state = DMX_STATE_GO;
 697         spin_unlock_irq(&demux->lock);
 698         mutex_unlock(&demux->mutex);
 699
 700         return 0;
 701 }
 702
 703 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 704 {
 705         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 706         struct dvb_demux *demux = feed->demux;
 707         int ret;
 708
 709         mutex_lock(&demux->mutex);
 710
 711         if (feed->state < DMX_STATE_GO) {
 712                 mutex_unlock(&demux->mutex);
 713                 return -EINVAL;
 714         }
 715
 716         if (!demux->stop_feed) {
 717                 mutex_unlock(&demux->mutex);
 718                 return -ENODEV;
 719         }
 720
 721         ret = demux->stop_feed(feed);
 722
 723         spin_lock_irq(&demux->lock);
 724         ts_feed->is_filtering = 0;
 725         feed->state = DMX_STATE_ALLOCATED;
 726         spin_unlock_irq(&demux->lock);
 727         mutex_unlock(&demux->mutex);
 728
 729         return ret;
 730 }
 731
 732 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 733                                    struct dmx_ts_feed **ts_feed,
 734                                    dmx_ts_cb callback)
 735 {
 736         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 737         struct dvb_demux_feed *feed;
 738
 739         if (mutex_lock_interruptible(&demux->mutex))
 740                 return -ERESTARTSYS;
 741
 742         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 743                 mutex_unlock(&demux->mutex);
 744                 return -EBUSY;
 745         }
 746
 747         feed->type = DMX_TYPE_TS;
 748         feed->cb.ts = callback;
 749         feed->demux = demux;
 750         feed->pid = 0xffff;
 751         feed->peslen = 0xfffa;
 752         feed->buffer = NULL;
 753
 754         (*ts_feed) = &feed->feed.ts;
 755         (*ts_feed)->parent = dmx;
 756         (*ts_feed)->priv = NULL;
 757         (*ts_feed)->is_filtering = 0;
 758         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 759         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 760         (*ts_feed)->set = dmx_ts_feed_set;
 761
 762         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 763                 feed->state = DMX_STATE_FREE;
 764                 mutex_unlock(&demux->mutex);
 765                 return -EBUSY;
 766         }
 767
 768         feed->filter->type = DMX_TYPE_TS;
 769         feed->filter->feed = feed;
 770         feed->filter->state = DMX_STATE_READY;
 771
 772         mutex_unlock(&demux->mutex);
 773
 774         return 0;
 775 }
 776
 777 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 778                                   struct dmx_ts_feed *ts_feed)
 779 {
 780         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 781         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 782
 783         mutex_lock(&demux->mutex);
 784
 785         if (feed->state == DMX_STATE_FREE) {
 786                 mutex_unlock(&demux->mutex);
 787                 return -EINVAL;
 788         }
 789 #ifndef NOBUFS
 790         vfree(feed->buffer);
 791         feed->buffer = NULL;
 792 #endif
 793
 794         feed->state = DMX_STATE_FREE;
 795         feed->filter->state = DMX_STATE_FREE;
 796
 797         dvb_demux_feed_del(feed);
 798
 799         feed->pid = 0xffff;
 800
 801         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_TS_PES_OTHER)
 802                 demux->pesfilter[feed->pes_type] = NULL;
 803
 804         mutex_unlock(&demux->mutex);
 805         return 0;
 806 }
 807
 808 /******************************************************************************
 809  * dmx_section_feed API calls
 810  ******************************************************************************/
 811
 812 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 813                                             struct dmx_section_filter **filter)
 814 {
 815         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 816         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 817         struct dvb_demux_filter *dvbdmxfilter;
 818
 819         if (mutex_lock_interruptible(&dvbdemux->mutex))
 820                 return -ERESTARTSYS;
 821
 822         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 823         if (!dvbdmxfilter) {
 824                 mutex_unlock(&dvbdemux->mutex);
 825                 return -EBUSY;
 826         }
 827
 828         spin_lock_irq(&dvbdemux->lock);
 829         *filter = &dvbdmxfilter->filter;
 830         (*filter)->parent = feed;
 831         (*filter)->priv = NULL;
 832         dvbdmxfilter->feed = dvbdmxfeed;
 833         dvbdmxfilter->type = DMX_TYPE_SEC;
 834         dvbdmxfilter->state = DMX_STATE_READY;
 835         dvbdmxfilter->next = dvbdmxfeed->filter;
 836         dvbdmxfeed->filter = dvbdmxfilter;
 837         spin_unlock_irq(&dvbdemux->lock);
 838
 839         mutex_unlock(&dvbdemux->mutex);
 840         return 0;
 841 }
 842
 843 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 844                                 u16 pid, size_t circular_buffer_size,
 845                                 int check_crc)
 846 {
 847         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 848         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 849
 850         if (pid > 0x1fff)
 851                 return -EINVAL;
 852
 853         if (mutex_lock_interruptible(&dvbdmx->mutex))
 854                 return -ERESTARTSYS;
 855
 856         dvb_demux_feed_add(dvbdmxfeed);
 857
 858         dvbdmxfeed->pid = pid;
 859         dvbdmxfeed->buffer_size = circular_buffer_size;
 860         dvbdmxfeed->feed.sec.check_crc = check_crc;
 861
 862 #ifdef NOBUFS
 863         dvbdmxfeed->buffer = NULL;
 864 #else
 865         dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
 866         if (!dvbdmxfeed->buffer) {
 867                 mutex_unlock(&dvbdmx->mutex);
 868                 return -ENOMEM;
 869         }
 870 #endif
 871
 872         dvbdmxfeed->state = DMX_STATE_READY;
 873         mutex_unlock(&dvbdmx->mutex);
 874         return 0;
 875 }
 876
 877 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 878 {
 879         int i;
 880         struct dvb_demux_filter *f;
 881         struct dmx_section_filter *sf;
 882         u8 mask, mode, doneq;
 883
 884         if (!(f = dvbdmxfeed->filter))
 885                 return;
 886         do {
 887                 sf = &f->filter;
 888                 doneq = 0;
 889                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 890                         mode = sf->filter_mode[i];
 891                         mask = sf->filter_mask[i];
 892                         f->maskandmode[i] = mask & mode;
 893                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 894                 }
 895                 f->doneq = doneq ? 1 : 0;
 896         } while ((f = f->next));
 897 }
 898
 899 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 900 {
 901         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 902         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 903         int ret;
 904
 905         if (mutex_lock_interruptible(&dvbdmx->mutex))
 906                 return -ERESTARTSYS;
 907
 908         if (feed->is_filtering) {
 909                 mutex_unlock(&dvbdmx->mutex);
 910                 return -EBUSY;
 911         }
 912
 913         if (!dvbdmxfeed->filter) {
 914                 mutex_unlock(&dvbdmx->mutex);
 915                 return -EINVAL;
 916         }
 917
 918         dvbdmxfeed->feed.sec.tsfeedp = 0;
 919         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 920         dvbdmxfeed->feed.sec.secbufp = 0;
 921         dvbdmxfeed->feed.sec.seclen = 0;
 922
 923         if (!dvbdmx->start_feed) {
 924                 mutex_unlock(&dvbdmx->mutex);
 925                 return -ENODEV;
 926         }
 927
 928         prepare_secfilters(dvbdmxfeed);
 929
 930         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 931                 mutex_unlock(&dvbdmx->mutex);
 932                 return ret;
 933         }
 934
 935         spin_lock_irq(&dvbdmx->lock);
 936         feed->is_filtering = 1;
 937         dvbdmxfeed->state = DMX_STATE_GO;
 938         spin_unlock_irq(&dvbdmx->lock);
 939
 940         mutex_unlock(&dvbdmx->mutex);
 941         return 0;
 942 }
 943
 944 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 945 {
 946         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 947         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 948         int ret;
 949
 950         mutex_lock(&dvbdmx->mutex);
 951
 952         if (!dvbdmx->stop_feed) {
 953                 mutex_unlock(&dvbdmx->mutex);
 954                 return -ENODEV;
 955         }
 956
 957         ret = dvbdmx->stop_feed(dvbdmxfeed);
 958
 959         spin_lock_irq(&dvbdmx->lock);
 960         dvbdmxfeed->state = DMX_STATE_READY;
 961         feed->is_filtering = 0;
 962         spin_unlock_irq(&dvbdmx->lock);
 963
 964         mutex_unlock(&dvbdmx->mutex);
 965         return ret;
 966 }
 967
 968 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
 969                                            struct dmx_section_filter *filter)
 970 {
 971         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
 972         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 973         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 974
 975         mutex_lock(&dvbdmx->mutex);
 976
 977         if (dvbdmxfilter->feed != dvbdmxfeed) {
 978                 mutex_unlock(&dvbdmx->mutex);
 979                 return -EINVAL;
 980         }
 981
 982         if (feed->is_filtering)
 983                 feed->stop_filtering(feed);
 984
 985         spin_lock_irq(&dvbdmx->lock);
 986         f = dvbdmxfeed->filter;
 987
 988         if (f == dvbdmxfilter) {
 989                 dvbdmxfeed->filter = dvbdmxfilter->next;
 990         } else {
 991                 while (f->next != dvbdmxfilter)
 992                         f = f->next;
 993                 f->next = f->next->next;
 994         }
 995
 996         dvbdmxfilter->state = DMX_STATE_FREE;
 997         spin_unlock_irq(&dvbdmx->lock);
 998         mutex_unlock(&dvbdmx->mutex);
 999         return 0;
1000 }
1001
1002 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1003                                         struct dmx_section_feed **feed,
1004                                         dmx_section_cb callback)
1005 {
1006         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1007         struct dvb_demux_feed *dvbdmxfeed;
1008
1009         if (mutex_lock_interruptible(&dvbdmx->mutex))
1010                 return -ERESTARTSYS;
1011
1012         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1013                 mutex_unlock(&dvbdmx->mutex);
1014                 return -EBUSY;
1015         }
1016
1017         dvbdmxfeed->type = DMX_TYPE_SEC;
1018         dvbdmxfeed->cb.sec = callback;
1019         dvbdmxfeed->demux = dvbdmx;
1020         dvbdmxfeed->pid = 0xffff;
1021         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1022         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1023         dvbdmxfeed->feed.sec.tsfeedp = 0;
1024         dvbdmxfeed->filter = NULL;
1025         dvbdmxfeed->buffer = NULL;
1026
1027         (*feed) = &dvbdmxfeed->feed.sec;
1028         (*feed)->is_filtering = 0;
1029         (*feed)->parent = demux;
1030         (*feed)->priv = NULL;
1031
1032         (*feed)->set = dmx_section_feed_set;
1033         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1034         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1035         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1036         (*feed)->release_filter = dmx_section_feed_release_filter;
1037
1038         mutex_unlock(&dvbdmx->mutex);
1039         return 0;
1040 }
1041
1042 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1043                                        struct dmx_section_feed *feed)
1044 {
1045         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1046         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1047
1048         mutex_lock(&dvbdmx->mutex);
1049
1050         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1051                 mutex_unlock(&dvbdmx->mutex);
1052                 return -EINVAL;
1053         }
1054 #ifndef NOBUFS
1055         vfree(dvbdmxfeed->buffer);
1056         dvbdmxfeed->buffer = NULL;
1057 #endif
1058         dvbdmxfeed->state = DMX_STATE_FREE;
1059
1060         dvb_demux_feed_del(dvbdmxfeed);
1061
1062         dvbdmxfeed->pid = 0xffff;
1063
1064         mutex_unlock(&dvbdmx->mutex);
1065         return 0;
1066 }
1067
1068 /******************************************************************************
1069  * dvb_demux kernel data API calls
1070  ******************************************************************************/
1071
1072 static int dvbdmx_open(struct dmx_demux *demux)
1073 {
1074         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1075
1076         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1077                 return -EUSERS;
1078
1079         dvbdemux->users++;
1080         return 0;
1081 }
1082
1083 static int dvbdmx_close(struct dmx_demux *demux)
1084 {
1085         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1086
1087         if (dvbdemux->users == 0)
1088                 return -ENODEV;
1089
1090         dvbdemux->users--;
1091         //FIXME: release any unneeded resources if users==0
1092         return 0;
1093 }
1094
1095 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1096 {
1097         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1098         void *p;
1099
1100         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1101                 return -EINVAL;
1102
1103         p = kmalloc(count, GFP_USER);
1104         if (!p)
1105                 return -ENOMEM;
1106         if (copy_from_user(p, buf, count)) {
1107                 kfree(p);
1108                 return -EFAULT;
1109         }
1110         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1111                 kfree(p);
1112                 return -ERESTARTSYS;
1113         }
1114         dvb_dmx_swfilter(dvbdemux, p, count);
1115         kfree(p);
1116         mutex_unlock(&dvbdemux->mutex);
1117
1118         if (signal_pending(current))
1119                 return -EINTR;
1120         return count;
1121 }
1122
1123 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1124                                struct dmx_frontend *frontend)
1125 {
1126         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1127         struct list_head *head = &dvbdemux->frontend_list;
1128
1129         list_add(&(frontend->connectivity_list), head);
1130
1131         return 0;
1132 }
1133
1134 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1135                                   struct dmx_frontend *frontend)
1136 {
1137         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1138         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1139
1140         list_for_each_safe(pos, n, head) {
1141                 if (DMX_FE_ENTRY(pos) == frontend) {
1142                         list_del(pos);
1143                         return 0;
1144                 }
1145         }
1146
1147         return -ENODEV;
1148 }
1149
1150 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1151 {
1152         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1153
1154         if (list_empty(&dvbdemux->frontend_list))
1155                 return NULL;
1156
1157         return &dvbdemux->frontend_list;
1158 }
1159
1160 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1161                                    struct dmx_frontend *frontend)
1162 {
1163         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1164
1165         if (demux->frontend)
1166                 return -EINVAL;
1167
1168         mutex_lock(&dvbdemux->mutex);
1169
1170         demux->frontend = frontend;
1171         mutex_unlock(&dvbdemux->mutex);
1172         return 0;
1173 }
1174
1175 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1176 {
1177         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1178
1179         mutex_lock(&dvbdemux->mutex);
1180
1181         demux->frontend = NULL;
1182         mutex_unlock(&dvbdemux->mutex);
1183         return 0;
1184 }
1185
1186 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1187 {
1188         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1189
1190         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1191         return 0;
1192 }
1193
1194 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1195 {
1196         int i;
1197         struct dmx_demux *dmx = &dvbdemux->dmx;
1198
1199         dvbdemux->cnt_storage = NULL;
1200         dvbdemux->users = 0;
1201         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1202
1203         if (!dvbdemux->filter)
1204                 return -ENOMEM;
1205
1206         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1207         if (!dvbdemux->feed) {
1208                 vfree(dvbdemux->filter);
1209                 return -ENOMEM;
1210         }
1211         for (i = 0; i < dvbdemux->filternum; i++) {
1212                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1213                 dvbdemux->filter[i].index = i;
1214         }
1215         for (i = 0; i < dvbdemux->feednum; i++) {
1216                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1217                 dvbdemux->feed[i].index = i;
1218         }
1219
1220         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1221
1222         for (i = 0; i < DMX_TS_PES_OTHER; i++) {
1223                 dvbdemux->pesfilter[i] = NULL;
1224                 dvbdemux->pids[i] = 0xffff;
1225         }
1226
1227         INIT_LIST_HEAD(&dvbdemux->feed_list);
1228
1229         dvbdemux->playing = 0;
1230         dvbdemux->recording = 0;
1231         dvbdemux->tsbufp = 0;
1232
1233         if (!dvbdemux->check_crc32)
1234                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1235
1236         if (!dvbdemux->memcopy)
1237                 dvbdemux->memcopy = dvb_dmx_memcopy;
1238
1239         dmx->frontend = NULL;
1240         dmx->priv = dvbdemux;
1241         dmx->open = dvbdmx_open;
1242         dmx->close = dvbdmx_close;
1243         dmx->write = dvbdmx_write;
1244         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1245         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1246         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1247         dmx->release_section_feed = dvbdmx_release_section_feed;
1248
1249         dmx->add_frontend = dvbdmx_add_frontend;
1250         dmx->remove_frontend = dvbdmx_remove_frontend;
1251         dmx->get_frontends = dvbdmx_get_frontends;
1252         dmx->connect_frontend = dvbdmx_connect_frontend;
1253         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1254         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1255
1256         mutex_init(&dvbdemux->mutex);
1257         spin_lock_init(&dvbdemux->lock);
1258
1259         return 0;
1260 }
1261
1262 EXPORT_SYMBOL(dvb_dmx_init);
1263
1264 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1265 {
1266         vfree(dvbdemux->cnt_storage);
1267         vfree(dvbdemux->filter);
1268         vfree(dvbdemux->feed);
1269 }
1270
1271 EXPORT_SYMBOL(dvb_dmx_release);