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 LIST_HEAD(dmx_muxs);
  43
  44
  45 static int dmx_register_demux(struct dmx_demux *demux)
  46 {
  47         demux->users = 0;
  48         list_add(&demux->reg_list, &dmx_muxs);
  49         return 0;
  50 }
  51
  52 static int dmx_unregister_demux(struct dmx_demux* demux)
  53 {
  54         struct list_head *pos, *n, *head=&dmx_muxs;
  55
  56         list_for_each_safe (pos, n, head) {
  57                 if (DMX_DIR_ENTRY(pos) == demux) {
  58                         if (demux->users>0)
  59                                 return -EINVAL;
  60                         list_del(pos);
  61                         return 0;
  62                 }
  63         }
  64
  65         return -ENODEV;
  66 }
  67
  68
  69 /******************************************************************************
  70  * static inlined helper functions
  71  ******************************************************************************/
  72
  73
  74 static inline u16 section_length(const u8 *buf)
  75 {
  76         return 3+((buf[1]&0x0f)<<8)+buf[2];
  77 }
  78
  79
  80 static inline u16 ts_pid(const u8 *buf)
  81 {
  82         return ((buf[1]&0x1f)<<8)+buf[2];
  83 }
  84
  85
  86 static inline u8 payload(const u8 *tsp)
  87 {
  88         if (!(tsp[3] & 0x10)) // no payload?
  89                 return 0;
  90         if (tsp[3] & 0x20) {  // adaptation field?
  91                 if (tsp[4] > 183)    // corrupted data?
  92                         return 0;
  93                 else
  94                         return 184-1-tsp[4];
  95         }
  96         return 184;
  97 }
  98
  99
 100 static u32 dvb_dmx_crc32 (struct dvb_demux_feed *f, const u8 *src, size_t len)
 101 {
 102         return (f->feed.sec.crc_val = crc32_be (f->feed.sec.crc_val, src, len));
 103 }
 104
 105
 106 static void dvb_dmx_memcopy (struct dvb_demux_feed *f, u8 *d, const u8 *s, size_t len)
 107 {
 108         memcpy (d, s, len);
 109 }
 110
 111
 112 /******************************************************************************
 113  * Software filter functions
 114  ******************************************************************************/
 115
 116 static inline int dvb_dmx_swfilter_payload (struct dvb_demux_feed *feed, const u8 *buf)
 117 {
 118         int count = payload(buf);
 119         int p;
 120         //int ccok;
 121         //u8 cc;
 122
 123         if (count == 0)
 124                 return -1;
 125
 126         p = 188-count;
 127
 128         /*
 129         cc=buf[3]&0x0f;
 130         ccok=((dvbdmxfeed->cc+1)&0x0f)==cc ? 1 : 0;
 131         dvbdmxfeed->cc=cc;
 132         if (!ccok)
 133                 printk("missed packet!\n");
 134         */
 135
 136         if (buf[1] & 0x40)  // PUSI ?
 137                 feed->peslen = 0xfffa;
 138
 139         feed->peslen += count;
 140
 141         return feed->cb.ts (&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
 142 }
 143
 144
 145 static int dvb_dmx_swfilter_sectionfilter (struct dvb_demux_feed *feed,
 146                                     struct dvb_demux_filter *f)
 147 {
 148         u8 neq = 0;
 149         int i;
 150
 151         for (i=0; i<DVB_DEMUX_MASK_MAX; i++) {
 152                 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 153
 154                 if (f->maskandmode[i] & xor)
 155                         return 0;
 156
 157                 neq |= f->maskandnotmode[i] & xor;
 158         }
 159
 160         if (f->doneq && !neq)
 161                 return 0;
 162
 163         return feed->cb.sec (feed->feed.sec.secbuf, feed->feed.sec.seclen,
 164                              NULL, 0, &f->filter, DMX_OK);
 165 }
 166
 167
 168 static inline int dvb_dmx_swfilter_section_feed (struct dvb_demux_feed *feed)
 169 {
 170         struct dvb_demux *demux = feed->demux;
 171         struct dvb_demux_filter *f = feed->filter;
 172         struct dmx_section_feed *sec = &feed->feed.sec;
 173         int section_syntax_indicator;
 174
 175         if (!sec->is_filtering)
 176                 return 0;
 177
 178         if (!f)
 179                 return 0;
 180
 181         if (sec->check_crc) {
 182                 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 183                 if (section_syntax_indicator &&
 184                     demux->check_crc32(feed, sec->secbuf, sec->seclen))
 185                         return -1;
 186         }
 187
 188         do {
 189                 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 190                         return -1;
 191         } while ((f = f->next) && sec->is_filtering);
 192
 193         sec->seclen = 0;
 194
 195         return 0;
 196 }
 197
 198
 199 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 200 {
 201         struct dmx_section_feed *sec = &feed->feed.sec;
 202
 203 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 204         if(sec->secbufp < sec->tsfeedp)
 205         {
 206                 int i, n = sec->tsfeedp - sec->secbufp;
 207
 208                 /* section padding is done with 0xff bytes entirely.
 209                 ** due to speed reasons, we won't check all of them
 210                 ** but just first and last
 211                 */
 212                 if(sec->secbuf[0] != 0xff || sec->secbuf[n-1] != 0xff)
 213                 {
 214                         printk("dvb_demux.c section ts padding loss: %d/%d\n",
 215                                n, sec->tsfeedp);
 216                         printk("dvb_demux.c pad data:");
 217                         for(i = 0; i < n; i++)
 218                                 printk(" %02x", sec->secbuf[i]);
 219                         printk("\n");
 220                 }
 221         }
 222 #endif
 223
 224         sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 225         sec->secbuf = sec->secbuf_base;
 226 }
 227
 228 /*
 229 ** Losless Section Demux 1.4.1 by Emard
 230 ** Valsecchi Patrick:
 231 **  - middle of section A  (no PUSI)
 232 **  - end of section A and start of section B
 233 **    (with PUSI pointing to the start of the second section)
 234 **
 235 **  In this case, without feed->pusi_seen you'll receive a garbage section
 236 **  consisting of the end of section A. Basically because tsfeedp
 237 **  is incemented and the use=0 condition is not raised
 238 **  when the second packet arrives.
 239 **
 240 ** Fix:
 241 ** when demux is started, let feed->pusi_seen = 0 to
 242 ** prevent initial feeding of garbage from the end of
 243 ** previous section. When you for the first time see PUSI=1
 244 ** then set feed->pusi_seen = 1
 245 */
 246 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed, const u8 *buf, u8 len)
 247 {
 248         struct dvb_demux *demux = feed->demux;
 249         struct dmx_section_feed *sec = &feed->feed.sec;
 250         u16 limit, seclen, n;
 251
 252         if(sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 253                 return 0;
 254
 255         if(sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE)
 256         {
 257 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 258                 printk("dvb_demux.c section buffer full loss: %d/%d\n",
 259                        sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE, DMX_MAX_SECFEED_SIZE);
 260 #endif
 261                 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 262         }
 263
 264         if(len <= 0)
 265                 return 0;
 266
 267         demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 268         sec->tsfeedp += len;
 269
 270         /* -----------------------------------------------------
 271         ** Dump all the sections we can find in the data (Emard)
 272         */
 273
 274         limit = sec->tsfeedp;
 275         if(limit > DMX_MAX_SECFEED_SIZE)
 276                 return -1; /* internal error should never happen */
 277
 278         /* to be sure always set secbuf */
 279         sec->secbuf = sec->secbuf_base + sec->secbufp;
 280
 281         for(n = 0; sec->secbufp + 2 < limit; n++)
 282         {
 283                 seclen = section_length(sec->secbuf);
 284                 if(seclen <= 0 || seclen > DMX_MAX_SECFEED_SIZE
 285                    || seclen + sec->secbufp > limit)
 286                         return 0;
 287                 sec->seclen = seclen;
 288                 sec->crc_val = ~0;
 289                 /* dump [secbuf .. secbuf+seclen) */
 290                 if(feed->pusi_seen)
 291                         dvb_dmx_swfilter_section_feed(feed);
 292 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 293                 else
 294                         printk("dvb_demux.c pusi not seen, discarding section data\n");
 295 #endif
 296                 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 297                 sec->secbuf += seclen; /* redundand but saves pointer arithmetic */
 298         }
 299
 300         return 0;
 301 }
 302
 303
 304 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, const u8 *buf)
 305 {
 306         u8 p, count;
 307         int ccok, dc_i = 0;
 308         u8 cc;
 309
 310         count = payload(buf);
 311
 312         if (count == 0)  /* count == 0 if no payload or out of range */
 313                 return -1;
 314
 315         p = 188 - count; /* payload start */
 316
 317         cc = buf[3] & 0x0f;
 318         ccok = ((feed->cc + 1) & 0x0f) == cc;
 319         feed->cc = cc;
 320
 321         if (buf[3] & 0x20) {
 322                 /* adaption field present, check for discontinuity_indicator */
 323                 if ((buf[4] > 0) && (buf[5] & 0x80))
 324                         dc_i = 1;
 325         }
 326
 327         if (!ccok || dc_i) {
 328 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 329                 printk("dvb_demux.c discontinuity detected %d bytes lost\n", count);
 330                 /* those bytes under sume circumstances will again be reported
 331                 ** in the following dvb_dmx_swfilter_section_new
 332                 */
 333 #endif
 334                 /* Discontinuity detected. Reset pusi_seen = 0 to
 335                 ** stop feeding of suspicious data until next PUSI=1 arrives
 336                 */
 337                 feed->pusi_seen = 0;
 338                 dvb_dmx_swfilter_section_new(feed);
 339                 return 0;
 340         }
 341
 342         if (buf[1] & 0x40) {
 343                 // PUSI=1 (is set), section boundary is here
 344                 if (count > 1 && buf[p] < count) {
 345                         const u8 *before = buf+p+1;
 346                         u8 before_len = buf[p];
 347                         const u8 *after = before+before_len;
 348                         u8 after_len = count-1-before_len;
 349
 350                         dvb_dmx_swfilter_section_copy_dump(feed, before, before_len);
 351                         /* before start of new section, set pusi_seen = 1 */
 352                         feed->pusi_seen = 1;
 353                         dvb_dmx_swfilter_section_new(feed);
 354                         dvb_dmx_swfilter_section_copy_dump(feed, after, after_len);
 355                 }
 356 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
 357                 else
 358                         if (count > 0)
 359                                 printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
 360 #endif
 361         } else {
 362                 // PUSI=0 (is not set), no section boundary
 363                 const u8 *entire = buf+p;
 364                 u8 entire_len = count;
 365
 366                 dvb_dmx_swfilter_section_copy_dump(feed, entire, entire_len);
 367         }
 368         return 0;
 369 }
 370
 371
 372 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed, const u8 *buf)
 373 {
 374         switch(feed->type) {
 375         case DMX_TYPE_TS:
 376                 if (!feed->feed.ts.is_filtering)
 377                         break;
 378                 if (feed->ts_type & TS_PACKET) {
 379                         if (feed->ts_type & TS_PAYLOAD_ONLY)
 380                                 dvb_dmx_swfilter_payload(feed, buf);
 381                         else
 382                                 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
 383                 }
 384                 if (feed->ts_type & TS_DECODER)
 385                         if (feed->demux->write_to_decoder)
 386                                 feed->demux->write_to_decoder(feed, buf, 188);
 387                 break;
 388
 389         case DMX_TYPE_SEC:
 390                 if (!feed->feed.sec.is_filtering)
 391                         break;
 392                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 393                         feed->feed.sec.seclen = feed->feed.sec.secbufp=0;
 394                 break;
 395
 396         default:
 397                 break;
 398         }
 399 }
 400
 401 #define DVR_FEED(f)                                                     \
 402         (((f)->type == DMX_TYPE_TS) &&                                  \
 403         ((f)->feed.ts.is_filtering) &&                                  \
 404         (((f)->ts_type & (TS_PACKET|TS_PAYLOAD_ONLY)) == TS_PACKET))
 405
 406 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 407 {
 408         struct dvb_demux_feed *feed;
 409         struct list_head *pos, *head=&demux->feed_list;
 410         u16 pid = ts_pid(buf);
 411         int dvr_done = 0;
 412
 413         list_for_each(pos, head) {
 414                 feed = list_entry(pos, struct dvb_demux_feed, list_head);
 415
 416                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 417                         continue;
 418
 419                 /* copy each packet only once to the dvr device, even
 420                  * if a PID is in multiple filters (e.g. video + PCR) */
 421                 if ((DVR_FEED(feed)) && (dvr_done++))
 422                         continue;
 423
 424                 if (feed->pid == pid) {
 425                         dvb_dmx_swfilter_packet_type(feed, buf);
 426                         if (DVR_FEED(feed))
 427                                 continue;
 428                 }
 429
 430                 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, size_t count)
 436 {
 437         spin_lock(&demux->lock);
 438
 439         while (count--) {
 440                 if(buf[0] == 0x47) {
 441                         dvb_dmx_swfilter_packet(demux, buf);
 442                 }
 443                 buf += 188;
 444         }
 445
 446         spin_unlock(&demux->lock);
 447 }
 448 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 449
 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 ((i = demux->tsbufp)) {
 458                 if (count < (j=188-i)) {
 459                         memcpy(&demux->tsbuf[i], buf, count);
 460                         demux->tsbufp += count;
 461                         goto bailout;
 462                 }
 463                 memcpy(&demux->tsbuf[i], buf, j);
 464                 if (demux->tsbuf[0] == 0x47)
 465                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 466                 demux->tsbufp = 0;
 467                 p += j;
 468         }
 469
 470         while (p < count) {
 471                 if (buf[p] == 0x47) {
 472                         if (count-p >= 188) {
 473                                 dvb_dmx_swfilter_packet(demux, buf+p);
 474                                 p += 188;
 475                         } else {
 476                                 i = count-p;
 477                                 memcpy(demux->tsbuf, buf+p, i);
 478                                 demux->tsbufp=i;
 479                                 goto bailout;
 480                         }
 481                 } else
 482                         p++;
 483         }
 484
 485 bailout:
 486         spin_unlock(&demux->lock);
 487 }
 488 EXPORT_SYMBOL(dvb_dmx_swfilter);
 489
 490 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 491 {
 492         int p = 0,i, j;
 493         u8 tmppack[188];
 494         spin_lock(&demux->lock);
 495
 496         if ((i = demux->tsbufp)) {
 497                 if (count < (j=204-i)) {
 498                         memcpy(&demux->tsbuf[i], buf, count);
 499                         demux->tsbufp += count;
 500                         goto bailout;
 501                 }
 502                 memcpy(&demux->tsbuf[i], buf, j);
 503                 if ((demux->tsbuf[0] == 0x47)|(demux->tsbuf[0]==0xB8))  {
 504                         memcpy(tmppack, demux->tsbuf, 188);
 505                         if (tmppack[0] == 0xB8) tmppack[0] = 0x47;
 506                         dvb_dmx_swfilter_packet(demux, tmppack);
 507                 }
 508                 demux->tsbufp = 0;
 509                 p += j;
 510         }
 511
 512         while (p < count) {
 513                 if ((buf[p] == 0x47)|(buf[p] == 0xB8)) {
 514                         if (count-p >= 204) {
 515                                 memcpy(tmppack, buf+p, 188);
 516                                 if (tmppack[0] == 0xB8) tmppack[0] = 0x47;
 517                                 dvb_dmx_swfilter_packet(demux, tmppack);
 518                                 p += 204;
 519                         } else {
 520                                 i = count-p;
 521                                 memcpy(demux->tsbuf, buf+p, i);
 522                                 demux->tsbufp=i;
 523                                 goto bailout;
 524                         }
 525                 } else {
 526                         p++;
 527                 }
 528         }
 529
 530 bailout:
 531         spin_unlock(&demux->lock);
 532 }
 533 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 534
 535
 536 static struct dvb_demux_filter * dvb_dmx_filter_alloc(struct dvb_demux *demux)
 537 {
 538         int i;
 539
 540         for (i=0; i<demux->filternum; i++)
 541                 if (demux->filter[i].state == DMX_STATE_FREE)
 542                         break;
 543
 544         if (i == demux->filternum)
 545                 return NULL;
 546
 547         demux->filter[i].state = DMX_STATE_ALLOCATED;
 548
 549         return &demux->filter[i];
 550 }
 551
 552 static struct dvb_demux_feed * dvb_dmx_feed_alloc(struct dvb_demux *demux)
 553 {
 554         int i;
 555
 556         for (i=0; i<demux->feednum; i++)
 557                 if (demux->feed[i].state == DMX_STATE_FREE)
 558                         break;
 559
 560         if (i == demux->feednum)
 561                 return NULL;
 562
 563         demux->feed[i].state = DMX_STATE_ALLOCATED;
 564
 565         return &demux->feed[i];
 566 }
 567
 568 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 569 {
 570         struct dvb_demux_feed *entry;
 571
 572         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 573                 if (entry == feed)
 574                         return 1;
 575
 576         return 0;
 577 }
 578
 579 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 580 {
 581         spin_lock_irq(&feed->demux->lock);
 582         if (dvb_demux_feed_find(feed)) {
 583                 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
 584                                 __FUNCTION__, feed->type, feed->state, feed->pid);
 585                 goto out;
 586         }
 587
 588         list_add(&feed->list_head, &feed->demux->feed_list);
 589 out:
 590         spin_unlock_irq(&feed->demux->lock);
 591 }
 592
 593 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 594 {
 595         spin_lock_irq(&feed->demux->lock);
 596         if (!(dvb_demux_feed_find(feed))) {
 597                 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
 598                                 __FUNCTION__, feed->type, feed->state, feed->pid);
 599                 goto out;
 600         }
 601
 602         list_del(&feed->list_head);
 603 out:
 604         spin_unlock_irq(&feed->demux->lock);
 605 }
 606
 607 static int dmx_ts_feed_set (struct dmx_ts_feed* ts_feed, u16 pid, int ts_type,
 608                      enum dmx_ts_pes pes_type, size_t callback_length,
 609                      size_t circular_buffer_size, int descramble,
 610                      struct timespec timeout)
 611 {
 612         struct dvb_demux_feed *feed = (struct dvb_demux_feed *) ts_feed;
 613         struct dvb_demux *demux = feed->demux;
 614
 615         if (pid > DMX_MAX_PID)
 616                 return -EINVAL;
 617
 618         if (down_interruptible (&demux->mutex))
 619                 return -ERESTARTSYS;
 620
 621         if (ts_type & TS_DECODER) {
 622                 if (pes_type >= DMX_TS_PES_OTHER) {
 623                         up(&demux->mutex);
 624                         return -EINVAL;
 625                 }
 626
 627                 if (demux->pesfilter[pes_type] &&
 628                     demux->pesfilter[pes_type] != feed) {
 629                         up(&demux->mutex);
 630                         return -EINVAL;
 631                 }
 632
 633                 demux->pesfilter[pes_type] = feed;
 634                 demux->pids[pes_type] = pid;
 635         }
 636
 637         dvb_demux_feed_add(feed);
 638
 639         feed->pid = pid;
 640         feed->buffer_size = circular_buffer_size;
 641         feed->descramble = descramble;
 642         feed->timeout = timeout;
 643         feed->cb_length = callback_length;
 644         feed->ts_type = ts_type;
 645         feed->pes_type = pes_type;
 646
 647         if (feed->descramble) {
 648                 up(&demux->mutex);
 649                 return -ENOSYS;
 650         }
 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                         up(&demux->mutex);
 659                         return -ENOMEM;
 660                 }
 661 #endif
 662         }
 663
 664         feed->state = DMX_STATE_READY;
 665         up(&demux->mutex);
 666
 667         return 0;
 668 }
 669
 670
 671 static int dmx_ts_feed_start_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         if (down_interruptible (&demux->mutex))
 678                 return -ERESTARTSYS;
 679
 680         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 681                 up(&demux->mutex);
 682                 return -EINVAL;
 683         }
 684
 685         if (!demux->start_feed) {
 686                 up(&demux->mutex);
 687                 return -ENODEV;
 688         }
 689
 690         if ((ret = demux->start_feed(feed)) < 0) {
 691                 up(&demux->mutex);
 692                 return ret;
 693         }
 694
 695         spin_lock_irq(&demux->lock);
 696         ts_feed->is_filtering = 1;
 697         feed->state = DMX_STATE_GO;
 698         spin_unlock_irq(&demux->lock);
 699         up(&demux->mutex);
 700
 701         return 0;
 702 }
 703
 704 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed* ts_feed)
 705 {
 706         struct dvb_demux_feed *feed = (struct dvb_demux_feed *) ts_feed;
 707         struct dvb_demux *demux = feed->demux;
 708         int ret;
 709
 710         if (down_interruptible (&demux->mutex))
 711                 return -ERESTARTSYS;
 712
 713         if (feed->state < DMX_STATE_GO) {
 714                 up(&demux->mutex);
 715                 return -EINVAL;
 716         }
 717
 718         if (!demux->stop_feed) {
 719                 up(&demux->mutex);
 720                 return -ENODEV;
 721         }
 722
 723         ret = demux->stop_feed(feed);
 724
 725         spin_lock_irq(&demux->lock);
 726         ts_feed->is_filtering = 0;
 727         feed->state = DMX_STATE_ALLOCATED;
 728         spin_unlock_irq(&demux->lock);
 729         up(&demux->mutex);
 730
 731         return ret;
 732 }
 733
 734 static int dvbdmx_allocate_ts_feed (struct dmx_demux *dmx, struct dmx_ts_feed **ts_feed,
 735                              dmx_ts_cb callback)
 736 {
 737         struct dvb_demux *demux = (struct dvb_demux *) dmx;
 738         struct dvb_demux_feed *feed;
 739
 740         if (down_interruptible (&demux->mutex))
 741                 return -ERESTARTSYS;
 742
 743         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 744                 up(&demux->mutex);
 745                 return -EBUSY;
 746         }
 747
 748         feed->type = DMX_TYPE_TS;
 749         feed->cb.ts = callback;
 750         feed->demux = demux;
 751         feed->pid = 0xffff;
 752         feed->peslen = 0xfffa;
 753         feed->buffer = NULL;
 754
 755         (*ts_feed) = &feed->feed.ts;
 756         (*ts_feed)->parent = dmx;
 757         (*ts_feed)->priv = NULL;
 758         (*ts_feed)->is_filtering = 0;
 759         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 760         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 761         (*ts_feed)->set = dmx_ts_feed_set;
 762
 763
 764         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 765                 feed->state = DMX_STATE_FREE;
 766                 up(&demux->mutex);
 767                 return -EBUSY;
 768         }
 769
 770         feed->filter->type = DMX_TYPE_TS;
 771         feed->filter->feed = feed;
 772         feed->filter->state = DMX_STATE_READY;
 773
 774         up(&demux->mutex);
 775
 776         return 0;
 777 }
 778
 779 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, struct dmx_ts_feed *ts_feed)
 780 {
 781         struct dvb_demux *demux = (struct dvb_demux *) dmx;
 782         struct dvb_demux_feed *feed = (struct dvb_demux_feed *) ts_feed;
 783
 784         if (down_interruptible (&demux->mutex))
 785                 return -ERESTARTSYS;
 786
 787         if (feed->state == DMX_STATE_FREE) {
 788                 up(&demux->mutex);
 789                 return -EINVAL;
 790         }
 791
 792 #ifndef NOBUFS
 793         vfree(feed->buffer);
 794         feed->buffer=0;
 795 #endif
 796
 797         feed->state = DMX_STATE_FREE;
 798         feed->filter->state = DMX_STATE_FREE;
 799
 800         dvb_demux_feed_del(feed);
 801
 802         feed->pid = 0xffff;
 803
 804         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_TS_PES_OTHER)
 805                 demux->pesfilter[feed->pes_type] = NULL;
 806
 807         up(&demux->mutex);
 808         return 0;
 809 }
 810
 811
 812 /******************************************************************************
 813  * dmx_section_feed API calls
 814  ******************************************************************************/
 815
 816 static int dmx_section_feed_allocate_filter(struct dmx_section_feed* feed,
 817                                      struct dmx_section_filter** filter)
 818 {
 819         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
 820         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 821         struct dvb_demux_filter *dvbdmxfilter;
 822
 823         if (down_interruptible (&dvbdemux->mutex))
 824                 return -ERESTARTSYS;
 825
 826         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 827         if (!dvbdmxfilter) {
 828                 up(&dvbdemux->mutex);
 829                 return -EBUSY;
 830         }
 831
 832         spin_lock_irq(&dvbdemux->lock);
 833         *filter = &dvbdmxfilter->filter;
 834         (*filter)->parent = feed;
 835         (*filter)->priv = NULL;
 836         dvbdmxfilter->feed = dvbdmxfeed;
 837         dvbdmxfilter->type = DMX_TYPE_SEC;
 838         dvbdmxfilter->state = DMX_STATE_READY;
 839         dvbdmxfilter->next = dvbdmxfeed->filter;
 840         dvbdmxfeed->filter = dvbdmxfilter;
 841         spin_unlock_irq(&dvbdemux->lock);
 842
 843         up(&dvbdemux->mutex);
 844         return 0;
 845 }
 846
 847
 848 static int dmx_section_feed_set(struct dmx_section_feed* feed,
 849                          u16 pid, size_t circular_buffer_size,
 850                          int descramble, int check_crc)
 851 {
 852         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
 853         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 854
 855         if (pid > 0x1fff)
 856                 return -EINVAL;
 857
 858         if (down_interruptible (&dvbdmx->mutex))
 859                 return -ERESTARTSYS;
 860
 861         dvb_demux_feed_add(dvbdmxfeed);
 862
 863         dvbdmxfeed->pid = pid;
 864         dvbdmxfeed->buffer_size = circular_buffer_size;
 865         dvbdmxfeed->descramble = descramble;
 866         if (dvbdmxfeed->descramble) {
 867                 up(&dvbdmx->mutex);
 868                 return -ENOSYS;
 869         }
 870
 871         dvbdmxfeed->feed.sec.check_crc = check_crc;
 872
 873 #ifdef NOBUFS
 874         dvbdmxfeed->buffer = NULL;
 875 #else
 876         dvbdmxfeed->buffer=vmalloc(dvbdmxfeed->buffer_size);
 877         if (!dvbdmxfeed->buffer) {
 878                 up(&dvbdmx->mutex);
 879                 return -ENOMEM;
 880         }
 881 #endif
 882
 883         dvbdmxfeed->state = DMX_STATE_READY;
 884         up(&dvbdmx->mutex);
 885         return 0;
 886 }
 887
 888
 889 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 890 {
 891         int i;
 892         struct dvb_demux_filter *f;
 893         struct dmx_section_filter *sf;
 894         u8 mask, mode, doneq;
 895
 896         if (!(f=dvbdmxfeed->filter))
 897                 return;
 898         do {
 899                 sf = &f->filter;
 900                 doneq = 0;
 901                 for (i=0; i<DVB_DEMUX_MASK_MAX; i++) {
 902                         mode = sf->filter_mode[i];
 903                         mask = sf->filter_mask[i];
 904                         f->maskandmode[i] = mask & mode;
 905                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 906                 }
 907                 f->doneq = doneq ? 1 : 0;
 908         } while ((f = f->next));
 909 }
 910
 911
 912 static int dmx_section_feed_start_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         if (down_interruptible (&dvbdmx->mutex))
 919                 return -ERESTARTSYS;
 920
 921         if (feed->is_filtering) {
 922                 up(&dvbdmx->mutex);
 923                 return -EBUSY;
 924         }
 925
 926         if (!dvbdmxfeed->filter) {
 927                 up(&dvbdmx->mutex);
 928                 return -EINVAL;
 929         }
 930
 931         dvbdmxfeed->feed.sec.tsfeedp = 0;
 932         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 933         dvbdmxfeed->feed.sec.secbufp = 0;
 934         dvbdmxfeed->feed.sec.seclen = 0;
 935
 936         if (!dvbdmx->start_feed) {
 937                 up(&dvbdmx->mutex);
 938                 return -ENODEV;
 939         }
 940
 941         prepare_secfilters(dvbdmxfeed);
 942
 943         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 944                 up(&dvbdmx->mutex);
 945                 return ret;
 946         }
 947
 948         spin_lock_irq(&dvbdmx->lock);
 949         feed->is_filtering = 1;
 950         dvbdmxfeed->state = DMX_STATE_GO;
 951         spin_unlock_irq(&dvbdmx->lock);
 952
 953         up(&dvbdmx->mutex);
 954         return 0;
 955 }
 956
 957
 958 static int dmx_section_feed_stop_filtering(struct dmx_section_feed* feed)
 959 {
 960         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
 961         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 962         int ret;
 963
 964         if (down_interruptible (&dvbdmx->mutex))
 965                 return -ERESTARTSYS;
 966
 967         if (!dvbdmx->stop_feed) {
 968                 up(&dvbdmx->mutex);
 969                 return -ENODEV;
 970         }
 971
 972         ret = dvbdmx->stop_feed(dvbdmxfeed);
 973
 974         spin_lock_irq(&dvbdmx->lock);
 975         dvbdmxfeed->state = DMX_STATE_READY;
 976         feed->is_filtering = 0;
 977         spin_unlock_irq(&dvbdmx->lock);
 978
 979         up(&dvbdmx->mutex);
 980         return ret;
 981 }
 982
 983
 984 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
 985                                 struct dmx_section_filter* filter)
 986 {
 987         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *) filter, *f;
 988         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
 989         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 990
 991         if (down_interruptible (&dvbdmx->mutex))
 992                 return -ERESTARTSYS;
 993
 994         if (dvbdmxfilter->feed != dvbdmxfeed) {
 995                 up(&dvbdmx->mutex);
 996                 return -EINVAL;
 997         }
 998
 999         if (feed->is_filtering)
1000                 feed->stop_filtering(feed);
1001
1002         spin_lock_irq(&dvbdmx->lock);
1003         f = dvbdmxfeed->filter;
1004
1005         if (f == dvbdmxfilter) {
1006                 dvbdmxfeed->filter = dvbdmxfilter->next;
1007         } else {
1008                 while(f->next != dvbdmxfilter)
1009                         f = f->next;
1010                 f->next = f->next->next;
1011         }
1012
1013         dvbdmxfilter->state = DMX_STATE_FREE;
1014         spin_unlock_irq(&dvbdmx->lock);
1015         up(&dvbdmx->mutex);
1016         return 0;
1017 }
1018
1019 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1020                                         struct dmx_section_feed **feed,
1021                                         dmx_section_cb callback)
1022 {
1023         struct dvb_demux *dvbdmx = (struct dvb_demux *) demux;
1024         struct dvb_demux_feed *dvbdmxfeed;
1025
1026         if (down_interruptible (&dvbdmx->mutex))
1027                 return -ERESTARTSYS;
1028
1029         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1030                 up(&dvbdmx->mutex);
1031                 return -EBUSY;
1032         }
1033
1034         dvbdmxfeed->type = DMX_TYPE_SEC;
1035         dvbdmxfeed->cb.sec = callback;
1036         dvbdmxfeed->demux = dvbdmx;
1037         dvbdmxfeed->pid = 0xffff;
1038         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1039         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1040         dvbdmxfeed->feed.sec.tsfeedp = 0;
1041         dvbdmxfeed->filter = NULL;
1042         dvbdmxfeed->buffer = NULL;
1043
1044         (*feed)=&dvbdmxfeed->feed.sec;
1045         (*feed)->is_filtering = 0;
1046         (*feed)->parent = demux;
1047         (*feed)->priv = NULL;
1048
1049         (*feed)->set = dmx_section_feed_set;
1050         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1051         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1052         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1053         (*feed)->release_filter = dmx_section_feed_release_filter;
1054
1055         up(&dvbdmx->mutex);
1056         return 0;
1057 }
1058
1059 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1060                                        struct dmx_section_feed *feed)
1061 {
1062         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
1063         struct dvb_demux *dvbdmx = (struct dvb_demux *) demux;
1064
1065         if (down_interruptible (&dvbdmx->mutex))
1066                 return -ERESTARTSYS;
1067
1068         if (dvbdmxfeed->state==DMX_STATE_FREE) {
1069                 up(&dvbdmx->mutex);
1070                 return -EINVAL;
1071         }
1072 #ifndef NOBUFS
1073         vfree(dvbdmxfeed->buffer);
1074         dvbdmxfeed->buffer=0;
1075 #endif
1076         dvbdmxfeed->state=DMX_STATE_FREE;
1077
1078         dvb_demux_feed_del(dvbdmxfeed);
1079
1080         dvbdmxfeed->pid = 0xffff;
1081
1082         up(&dvbdmx->mutex);
1083         return 0;
1084 }
1085
1086
1087 /******************************************************************************
1088  * dvb_demux kernel data API calls
1089  ******************************************************************************/
1090
1091 static int dvbdmx_open(struct dmx_demux *demux)
1092 {
1093         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1094
1095         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1096                 return -EUSERS;
1097
1098         dvbdemux->users++;
1099         return 0;
1100 }
1101
1102
1103 static int dvbdmx_close(struct dmx_demux *demux)
1104 {
1105         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1106
1107         if (dvbdemux->users == 0)
1108                 return -ENODEV;
1109
1110         dvbdemux->users--;
1111         //FIXME: release any unneeded resources if users==0
1112         return 0;
1113 }
1114
1115
1116 static int dvbdmx_write(struct dmx_demux *demux, const char *buf, size_t count)
1117 {
1118         struct dvb_demux *dvbdemux=(struct dvb_demux *) demux;
1119
1120         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1121                 return -EINVAL;
1122
1123         if (down_interruptible (&dvbdemux->mutex))
1124                 return -ERESTARTSYS;
1125         dvb_dmx_swfilter(dvbdemux, buf, count);
1126         up(&dvbdemux->mutex);
1127
1128         if (signal_pending(current))
1129                 return -EINTR;
1130         return count;
1131 }
1132
1133
1134 static int dvbdmx_add_frontend(struct dmx_demux *demux, struct dmx_frontend *frontend)
1135 {
1136         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1137         struct list_head *head = &dvbdemux->frontend_list;
1138
1139         list_add(&(frontend->connectivity_list), head);
1140
1141         return 0;
1142 }
1143
1144
1145 static int dvbdmx_remove_frontend(struct dmx_demux *demux, struct dmx_frontend *frontend)
1146 {
1147         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1148         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1149
1150         list_for_each_safe (pos, n, head) {
1151                 if (DMX_FE_ENTRY(pos) == frontend) {
1152                         list_del(pos);
1153                         return 0;
1154                 }
1155         }
1156
1157         return -ENODEV;
1158 }
1159
1160
1161 static struct list_head * dvbdmx_get_frontends(struct dmx_demux *demux)
1162 {
1163         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1164
1165         if (list_empty(&dvbdemux->frontend_list))
1166                 return NULL;
1167         return &dvbdemux->frontend_list;
1168 }
1169
1170
1171 static int dvbdmx_connect_frontend(struct dmx_demux *demux, struct dmx_frontend *frontend)
1172 {
1173         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1174
1175         if (demux->frontend)
1176                 return -EINVAL;
1177
1178         if (down_interruptible (&dvbdemux->mutex))
1179                 return -ERESTARTSYS;
1180
1181         demux->frontend = frontend;
1182         up(&dvbdemux->mutex);
1183         return 0;
1184 }
1185
1186
1187 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1188 {
1189         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1190
1191         if (down_interruptible (&dvbdemux->mutex))
1192                 return -ERESTARTSYS;
1193
1194         demux->frontend = NULL;
1195         up(&dvbdemux->mutex);
1196         return 0;
1197 }
1198
1199
1200 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 *pids)
1201 {
1202         struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
1203
1204         memcpy(pids, dvbdemux->pids, 5*sizeof(u16));
1205         return 0;
1206 }
1207
1208
1209 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1210 {
1211         int i, err;
1212         struct dmx_demux *dmx = &dvbdemux->dmx;
1213
1214         dvbdemux->users = 0;
1215         dvbdemux->filter = vmalloc(dvbdemux->filternum*sizeof(struct dvb_demux_filter));
1216
1217         if (!dvbdemux->filter)
1218                 return -ENOMEM;
1219
1220         dvbdemux->feed = vmalloc(dvbdemux->feednum*sizeof(struct dvb_demux_feed));
1221         if (!dvbdemux->feed) {
1222                 vfree(dvbdemux->filter);
1223                 return -ENOMEM;
1224         }
1225         for (i=0; i<dvbdemux->filternum; i++) {
1226                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1227                 dvbdemux->filter[i].index = i;
1228         }
1229         for (i=0; i<dvbdemux->feednum; i++) {
1230                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1231                 dvbdemux->feed[i].index = i;
1232         }
1233         dvbdemux->frontend_list.next=
1234           dvbdemux->frontend_list.prev=
1235             &dvbdemux->frontend_list;
1236         for (i=0; i<DMX_TS_PES_OTHER; i++) {
1237                 dvbdemux->pesfilter[i] = NULL;
1238                 dvbdemux->pids[i] = 0xffff;
1239         }
1240
1241         INIT_LIST_HEAD(&dvbdemux->feed_list);
1242
1243         dvbdemux->playing = 0;
1244         dvbdemux->recording = 0;
1245         dvbdemux->tsbufp = 0;
1246
1247         if (!dvbdemux->check_crc32)
1248                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1249
1250          if (!dvbdemux->memcopy)
1251                  dvbdemux->memcopy = dvb_dmx_memcopy;
1252
1253         dmx->frontend = NULL;
1254         dmx->reg_list.prev = dmx->reg_list.next = &dmx->reg_list;
1255         dmx->priv = (void *) dvbdemux;
1256         dmx->open = dvbdmx_open;
1257         dmx->close = dvbdmx_close;
1258         dmx->write = dvbdmx_write;
1259         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1260         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1261         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1262         dmx->release_section_feed = dvbdmx_release_section_feed;
1263
1264         dmx->descramble_mac_address = NULL;
1265         dmx->descramble_section_payload = NULL;
1266
1267         dmx->add_frontend = dvbdmx_add_frontend;
1268         dmx->remove_frontend = dvbdmx_remove_frontend;
1269         dmx->get_frontends = dvbdmx_get_frontends;
1270         dmx->connect_frontend = dvbdmx_connect_frontend;
1271         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1272         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1273
1274         sema_init(&dvbdemux->mutex, 1);
1275         spin_lock_init(&dvbdemux->lock);
1276
1277         if ((err = dmx_register_demux(dmx)) < 0)
1278                 return err;
1279
1280         return 0;
1281 }
1282 EXPORT_SYMBOL(dvb_dmx_init);
1283
1284
1285 int dvb_dmx_release(struct dvb_demux *dvbdemux)
1286 {
1287         struct dmx_demux *dmx = &dvbdemux->dmx;
1288
1289         dmx_unregister_demux(dmx);
1290         vfree(dvbdemux->filter);
1291         vfree(dvbdemux->feed);
1292         return 0;
1293 }
1294 EXPORT_SYMBOL(dvb_dmx_release);