linux/drivers/media/dvb-core/dvb_demux.c
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   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 */
  19
  20#define pr_fmt(fmt) "dvb_demux: " fmt
  21
  22#include <linux/sched/signal.h>
  23#include <linux/spinlock.h>
  24#include <linux/slab.h>
  25#include <linux/vmalloc.h>
  26#include <linux/module.h>
  27#include <linux/poll.h>
  28#include <linux/string.h>
  29#include <linux/crc32.h>
  30#include <linux/uaccess.h>
  31#include <asm/div64.h>
  32
  33#include <media/dvb_demux.h>
  34
  35static int dvb_demux_tscheck;
  36module_param(dvb_demux_tscheck, int, 0644);
  37MODULE_PARM_DESC(dvb_demux_tscheck,
  38                "enable transport stream continuity and TEI check");
  39
  40static int dvb_demux_speedcheck;
  41module_param(dvb_demux_speedcheck, int, 0644);
  42MODULE_PARM_DESC(dvb_demux_speedcheck,
  43                "enable transport stream speed check");
  44
  45static int dvb_demux_feed_err_pkts = 1;
  46module_param(dvb_demux_feed_err_pkts, int, 0644);
  47MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
  48                 "when set to 0, drop packets with the TEI bit set (1 by default)");
  49
  50#define dprintk(fmt, arg...) \
  51        printk(KERN_DEBUG pr_fmt("%s: " fmt),  __func__, ##arg)
  52
  53#define dprintk_tscheck(x...) do {                      \
  54        if (dvb_demux_tscheck && printk_ratelimit())    \
  55                dprintk(x);                             \
  56} while (0)
  57
  58#ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
  59#  define dprintk_sect_loss(x...) dprintk(x)
  60#else
  61#  define dprintk_sect_loss(x...)
  62#endif
  63
  64#define set_buf_flags(__feed, __flag)                   \
  65        do {                                            \
  66                (__feed)->buffer_flags |= (__flag);     \
  67        } while (0)
  68
  69/******************************************************************************
  70 * static inlined helper functions
  71 ******************************************************************************/
  72
  73static inline u16 section_length(const u8 *buf)
  74{
  75        return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
  76}
  77
  78static inline u16 ts_pid(const u8 *buf)
  79{
  80        return ((buf[1] & 0x1f) << 8) + buf[2];
  81}
  82
  83static inline u8 payload(const u8 *tsp)
  84{
  85        if (!(tsp[3] & 0x10))   // no payload?
  86                return 0;
  87
  88        if (tsp[3] & 0x20) {    // adaptation field?
  89                if (tsp[4] > 183)       // corrupted data?
  90                        return 0;
  91                else
  92                        return 184 - 1 - tsp[4];
  93        }
  94
  95        return 184;
  96}
  97
  98static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
  99{
 100        return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
 101}
 102
 103static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
 104                            size_t len)
 105{
 106        memcpy(d, s, len);
 107}
 108
 109/******************************************************************************
 110 * Software filter functions
 111 ******************************************************************************/
 112
 113static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
 114                                           const u8 *buf)
 115{
 116        int count = payload(buf);
 117        int p;
 118        int ccok;
 119        u8 cc;
 120
 121        if (count == 0)
 122                return -1;
 123
 124        p = 188 - count;
 125
 126        cc = buf[3] & 0x0f;
 127        ccok = ((feed->cc + 1) & 0x0f) == cc;
 128        feed->cc = cc;
 129        if (!ccok) {
 130                set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 131                dprintk_sect_loss("missed packet: %d instead of %d!\n",
 132                                  cc, (feed->cc + 1) & 0x0f);
 133        }
 134
 135        if (buf[1] & 0x40)      // PUSI ?
 136                feed->peslen = 0xfffa;
 137
 138        feed->peslen += count;
 139
 140        return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts,
 141                           &feed->buffer_flags);
 142}
 143
 144static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 145                                          struct dvb_demux_filter *f)
 146{
 147        u8 neq = 0;
 148        int i;
 149
 150        for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 151                u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 152
 153                if (f->maskandmode[i] & xor)
 154                        return 0;
 155
 156                neq |= f->maskandnotmode[i] & xor;
 157        }
 158
 159        if (f->doneq && !neq)
 160                return 0;
 161
 162        return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 163                            NULL, 0, &f->filter, &feed->buffer_flags);
 164}
 165
 166static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 167{
 168        struct dvb_demux *demux = feed->demux;
 169        struct dvb_demux_filter *f = feed->filter;
 170        struct dmx_section_feed *sec = &feed->feed.sec;
 171        int section_syntax_indicator;
 172
 173        if (!sec->is_filtering)
 174                return 0;
 175
 176        if (!f)
 177                return 0;
 178
 179        if (sec->check_crc) {
 180                section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 181                if (section_syntax_indicator &&
 182                    demux->check_crc32(feed, sec->secbuf, sec->seclen)) {
 183                        set_buf_flags(feed, DMX_BUFFER_FLAG_HAD_CRC32_DISCARD);
 184                        return -1;
 185                }
 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
 198static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 199{
 200        struct dmx_section_feed *sec = &feed->feed.sec;
 201
 202        if (sec->secbufp < sec->tsfeedp) {
 203                int n = sec->tsfeedp - sec->secbufp;
 204
 205                /*
 206                 * Section padding is done with 0xff bytes entirely.
 207                 * Due to speed reasons, we won't check all of them
 208                 * but just first and last.
 209                 */
 210                if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 211                        set_buf_flags(feed,
 212                                      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 213                        dprintk_sect_loss("section ts padding loss: %d/%d\n",
 214                                          n, sec->tsfeedp);
 215                        dprintk_sect_loss("pad data: %*ph\n", n, sec->secbuf);
 216                }
 217        }
 218
 219        sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 220        sec->secbuf = sec->secbuf_base;
 221}
 222
 223/*
 224 * Losless Section Demux 1.4.1 by Emard
 225 * Valsecchi Patrick:
 226 *  - middle of section A  (no PUSI)
 227 *  - end of section A and start of section B
 228 *    (with PUSI pointing to the start of the second section)
 229 *
 230 *  In this case, without feed->pusi_seen you'll receive a garbage section
 231 *  consisting of the end of section A. Basically because tsfeedp
 232 *  is incemented and the use=0 condition is not raised
 233 *  when the second packet arrives.
 234 *
 235 * Fix:
 236 * when demux is started, let feed->pusi_seen = false to
 237 * prevent initial feeding of garbage from the end of
 238 * previous section. When you for the first time see PUSI=1
 239 * then set feed->pusi_seen = true
 240 */
 241static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
 242                                              const u8 *buf, u8 len)
 243{
 244        struct dvb_demux *demux = feed->demux;
 245        struct dmx_section_feed *sec = &feed->feed.sec;
 246        u16 limit, seclen, n;
 247
 248        if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 249                return 0;
 250
 251        if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 252                set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 253                dprintk_sect_loss("section buffer full loss: %d/%d\n",
 254                                  sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 255                                  DMX_MAX_SECFEED_SIZE);
 256                len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 257        }
 258
 259        if (len <= 0)
 260                return 0;
 261
 262        demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 263        sec->tsfeedp += len;
 264
 265        /*
 266         * Dump all the sections we can find in the data (Emard)
 267         */
 268        limit = sec->tsfeedp;
 269        if (limit > DMX_MAX_SECFEED_SIZE)
 270                return -1;      /* internal error should never happen */
 271
 272        /* to be sure always set secbuf */
 273        sec->secbuf = sec->secbuf_base + sec->secbufp;
 274
 275        for (n = 0; sec->secbufp + 2 < limit; n++) {
 276                seclen = section_length(sec->secbuf);
 277                if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 278                    || seclen + sec->secbufp > limit)
 279                        return 0;
 280                sec->seclen = seclen;
 281                sec->crc_val = ~0;
 282                /* dump [secbuf .. secbuf+seclen) */
 283                if (feed->pusi_seen) {
 284                        dvb_dmx_swfilter_section_feed(feed);
 285                } else {
 286                        set_buf_flags(feed,
 287                                      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 288                        dprintk_sect_loss("pusi not seen, discarding section data\n");
 289                }
 290                sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 291                sec->secbuf += seclen;  /* redundant but saves pointer arithmetic */
 292        }
 293
 294        return 0;
 295}
 296
 297static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 298                                           const u8 *buf)
 299{
 300        u8 p, count;
 301        int ccok, dc_i = 0;
 302        u8 cc;
 303
 304        count = payload(buf);
 305
 306        if (count == 0)         /* count == 0 if no payload or out of range */
 307                return -1;
 308
 309        p = 188 - count;        /* payload start */
 310
 311        cc = buf[3] & 0x0f;
 312        ccok = ((feed->cc + 1) & 0x0f) == cc;
 313        feed->cc = cc;
 314
 315        if (buf[3] & 0x20) {
 316                /* adaption field present, check for discontinuity_indicator */
 317                if ((buf[4] > 0) && (buf[5] & 0x80))
 318                        dc_i = 1;
 319        }
 320
 321        if (!ccok || dc_i) {
 322                if (dc_i) {
 323                        set_buf_flags(feed,
 324                                      DMX_BUFFER_FLAG_DISCONTINUITY_INDICATOR);
 325                        dprintk_sect_loss("%d frame with disconnect indicator\n",
 326                                cc);
 327                } else {
 328                        set_buf_flags(feed,
 329                                      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 330                        dprintk_sect_loss("discontinuity: %d instead of %d. %d bytes lost\n",
 331                                cc, (feed->cc + 1) & 0x0f, count + 4);
 332                }
 333                /*
 334                 * those bytes under some circumstances will again be reported
 335                 * in the following dvb_dmx_swfilter_section_new
 336                 */
 337
 338                /*
 339                 * Discontinuity detected. Reset pusi_seen to
 340                 * stop feeding of suspicious data until next PUSI=1 arrives
 341                 *
 342                 * FIXME: does it make sense if the MPEG-TS is the one
 343                 *      reporting discontinuity?
 344                 */
 345
 346                feed->pusi_seen = false;
 347                dvb_dmx_swfilter_section_new(feed);
 348        }
 349
 350        if (buf[1] & 0x40) {
 351                /* PUSI=1 (is set), section boundary is here */
 352                if (count > 1 && buf[p] < count) {
 353                        const u8 *before = &buf[p + 1];
 354                        u8 before_len = buf[p];
 355                        const u8 *after = &before[before_len];
 356                        u8 after_len = count - 1 - before_len;
 357
 358                        dvb_dmx_swfilter_section_copy_dump(feed, before,
 359                                                           before_len);
 360                        /* before start of new section, set pusi_seen */
 361                        feed->pusi_seen = true;
 362                        dvb_dmx_swfilter_section_new(feed);
 363                        dvb_dmx_swfilter_section_copy_dump(feed, after,
 364                                                           after_len);
 365                } else if (count > 0) {
 366                        set_buf_flags(feed,
 367                                      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 368                        dprintk_sect_loss("PUSI=1 but %d bytes lost\n", count);
 369                }
 370        } else {
 371                /* PUSI=0 (is not set), no section boundary */
 372                dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 373        }
 374
 375        return 0;
 376}
 377
 378static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 379                                                const u8 *buf)
 380{
 381        switch (feed->type) {
 382        case DMX_TYPE_TS:
 383                if (!feed->feed.ts.is_filtering)
 384                        break;
 385                if (feed->ts_type & TS_PACKET) {
 386                        if (feed->ts_type & TS_PAYLOAD_ONLY)
 387                                dvb_dmx_swfilter_payload(feed, buf);
 388                        else
 389                                feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
 390                                            &feed->buffer_flags);
 391                }
 392                /* Used only on full-featured devices */
 393                if (feed->ts_type & TS_DECODER)
 394                        if (feed->demux->write_to_decoder)
 395                                feed->demux->write_to_decoder(feed, buf, 188);
 396                break;
 397
 398        case DMX_TYPE_SEC:
 399                if (!feed->feed.sec.is_filtering)
 400                        break;
 401                if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 402                        feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 403                break;
 404
 405        default:
 406                break;
 407        }
 408}
 409
 410#define DVR_FEED(f)                                                     \
 411        (((f)->type == DMX_TYPE_TS) &&                                  \
 412        ((f)->feed.ts.is_filtering) &&                                  \
 413        (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 414
 415static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 416{
 417        struct dvb_demux_feed *feed;
 418        u16 pid = ts_pid(buf);
 419        int dvr_done = 0;
 420
 421        if (dvb_demux_speedcheck) {
 422                ktime_t cur_time;
 423                u64 speed_bytes, speed_timedelta;
 424
 425                demux->speed_pkts_cnt++;
 426
 427                /* show speed every SPEED_PKTS_INTERVAL packets */
 428                if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 429                        cur_time = ktime_get();
 430
 431                        if (ktime_to_ns(demux->speed_last_time) != 0) {
 432                                speed_bytes = (u64)demux->speed_pkts_cnt
 433                                        * 188 * 8;
 434                                /* convert to 1024 basis */
 435                                speed_bytes = 1000 * div64_u64(speed_bytes,
 436                                                1024);
 437                                speed_timedelta = ktime_ms_delta(cur_time,
 438                                                        demux->speed_last_time);
 439                                if (speed_timedelta)
 440                                        dprintk("TS speed %llu Kbits/sec \n",
 441                                                div64_u64(speed_bytes,
 442                                                          speed_timedelta));
 443                        }
 444
 445                        demux->speed_last_time = cur_time;
 446                        demux->speed_pkts_cnt = 0;
 447                }
 448        }
 449
 450        if (buf[1] & 0x80) {
 451                list_for_each_entry(feed, &demux->feed_list, list_head) {
 452                        if ((feed->pid != pid) && (feed->pid != 0x2000))
 453                                continue;
 454                        set_buf_flags(feed, DMX_BUFFER_FLAG_TEI);
 455                }
 456                dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",
 457                                pid, buf[1]);
 458                /* data in this packet can't be trusted - drop it unless
 459                 * module option dvb_demux_feed_err_pkts is set */
 460                if (!dvb_demux_feed_err_pkts)
 461                        return;
 462        } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 463                if (demux->cnt_storage && dvb_demux_tscheck) {
 464                        /* check pkt counter */
 465                        if (pid < MAX_PID) {
 466                                if (buf[3] & 0x10)
 467                                        demux->cnt_storage[pid] =
 468                                                (demux->cnt_storage[pid] + 1) & 0xf;
 469
 470                                if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
 471                                        list_for_each_entry(feed, &demux->feed_list, list_head) {
 472                                                if ((feed->pid != pid) && (feed->pid != 0x2000))
 473                                                        continue;
 474                                                set_buf_flags(feed,
 475                                                              DMX_BUFFER_PKT_COUNTER_MISMATCH);
 476                                        }
 477
 478                                        dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
 479                                                        pid, demux->cnt_storage[pid],
 480                                                        buf[3] & 0xf);
 481                                        demux->cnt_storage[pid] = buf[3] & 0xf;
 482                                }
 483                        }
 484                        /* end check */
 485                }
 486
 487        list_for_each_entry(feed, &demux->feed_list, list_head) {
 488                if ((feed->pid != pid) && (feed->pid != 0x2000))
 489                        continue;
 490
 491                /* copy each packet only once to the dvr device, even
 492                 * if a PID is in multiple filters (e.g. video + PCR) */
 493                if ((DVR_FEED(feed)) && (dvr_done++))
 494                        continue;
 495
 496                if (feed->pid == pid)
 497                        dvb_dmx_swfilter_packet_type(feed, buf);
 498                else if (feed->pid == 0x2000)
 499                        feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
 500                                    &feed->buffer_flags);
 501        }
 502}
 503
 504void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 505                              size_t count)
 506{
 507        unsigned long flags;
 508
 509        spin_lock_irqsave(&demux->lock, flags);
 510
 511        while (count--) {
 512                if (buf[0] == 0x47)
 513                        dvb_dmx_swfilter_packet(demux, buf);
 514                buf += 188;
 515        }
 516
 517        spin_unlock_irqrestore(&demux->lock, flags);
 518}
 519
 520EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 521
 522static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 523                                   const int pktsize)
 524{
 525        int start = pos, lost;
 526
 527        while (pos < count) {
 528                if (buf[pos] == 0x47 ||
 529                    (pktsize == 204 && buf[pos] == 0xB8))
 530                        break;
 531                pos++;
 532        }
 533
 534        lost = pos - start;
 535        if (lost) {
 536                /* This garbage is part of a valid packet? */
 537                int backtrack = pos - pktsize;
 538                if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 539                    (pktsize == 204 && buf[backtrack] == 0xB8)))
 540                        return backtrack;
 541        }
 542
 543        return pos;
 544}
 545
 546/* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 547static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 548                size_t count, const int pktsize)
 549{
 550        int p = 0, i, j;
 551        const u8 *q;
 552        unsigned long flags;
 553
 554        spin_lock_irqsave(&demux->lock, flags);
 555
 556        if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 557                i = demux->tsbufp;
 558                j = pktsize - i;
 559                if (count < j) {
 560                        memcpy(&demux->tsbuf[i], buf, count);
 561                        demux->tsbufp += count;
 562                        goto bailout;
 563                }
 564                memcpy(&demux->tsbuf[i], buf, j);
 565                if (demux->tsbuf[0] == 0x47) /* double check */
 566                        dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 567                demux->tsbufp = 0;
 568                p += j;
 569        }
 570
 571        while (1) {
 572                p = find_next_packet(buf, p, count, pktsize);
 573                if (p >= count)
 574                        break;
 575                if (count - p < pktsize)
 576                        break;
 577
 578                q = &buf[p];
 579
 580                if (pktsize == 204 && (*q == 0xB8)) {
 581                        memcpy(demux->tsbuf, q, 188);
 582                        demux->tsbuf[0] = 0x47;
 583                        q = demux->tsbuf;
 584                }
 585                dvb_dmx_swfilter_packet(demux, q);
 586                p += pktsize;
 587        }
 588
 589        i = count - p;
 590        if (i) {
 591                memcpy(demux->tsbuf, &buf[p], i);
 592                demux->tsbufp = i;
 593                if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 594                        demux->tsbuf[0] = 0x47;
 595        }
 596
 597bailout:
 598        spin_unlock_irqrestore(&demux->lock, flags);
 599}
 600
 601void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 602{
 603        _dvb_dmx_swfilter(demux, buf, count, 188);
 604}
 605EXPORT_SYMBOL(dvb_dmx_swfilter);
 606
 607void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 608{
 609        _dvb_dmx_swfilter(demux, buf, count, 204);
 610}
 611EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 612
 613void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 614{
 615        unsigned long flags;
 616
 617        spin_lock_irqsave(&demux->lock, flags);
 618
 619        demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts,
 620                           &demux->feed->buffer_flags);
 621
 622        spin_unlock_irqrestore(&demux->lock, flags);
 623}
 624EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 625
 626static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 627{
 628        int i;
 629
 630        for (i = 0; i < demux->filternum; i++)
 631                if (demux->filter[i].state == DMX_STATE_FREE)
 632                        break;
 633
 634        if (i == demux->filternum)
 635                return NULL;
 636
 637        demux->filter[i].state = DMX_STATE_ALLOCATED;
 638
 639        return &demux->filter[i];
 640}
 641
 642static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 643{
 644        int i;
 645
 646        for (i = 0; i < demux->feednum; i++)
 647                if (demux->feed[i].state == DMX_STATE_FREE)
 648                        break;
 649
 650        if (i == demux->feednum)
 651                return NULL;
 652
 653        demux->feed[i].state = DMX_STATE_ALLOCATED;
 654
 655        return &demux->feed[i];
 656}
 657
 658static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 659{
 660        struct dvb_demux_feed *entry;
 661
 662        list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 663                if (entry == feed)
 664                        return 1;
 665
 666        return 0;
 667}
 668
 669static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 670{
 671        spin_lock_irq(&feed->demux->lock);
 672        if (dvb_demux_feed_find(feed)) {
 673                pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",
 674                       __func__, feed->type, feed->state, feed->pid);
 675                goto out;
 676        }
 677
 678        list_add(&feed->list_head, &feed->demux->feed_list);
 679out:
 680        spin_unlock_irq(&feed->demux->lock);
 681}
 682
 683static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 684{
 685        spin_lock_irq(&feed->demux->lock);
 686        if (!(dvb_demux_feed_find(feed))) {
 687                pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",
 688                       __func__, feed->type, feed->state, feed->pid);
 689                goto out;
 690        }
 691
 692        list_del(&feed->list_head);
 693out:
 694        spin_unlock_irq(&feed->demux->lock);
 695}
 696
 697static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 698                           enum dmx_ts_pes pes_type, ktime_t timeout)
 699{
 700        struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 701        struct dvb_demux *demux = feed->demux;
 702
 703        if (pid > DMX_MAX_PID)
 704                return -EINVAL;
 705
 706        if (mutex_lock_interruptible(&demux->mutex))
 707                return -ERESTARTSYS;
 708
 709        if (ts_type & TS_DECODER) {
 710                if (pes_type >= DMX_PES_OTHER) {
 711                        mutex_unlock(&demux->mutex);
 712                        return -EINVAL;
 713                }
 714
 715                if (demux->pesfilter[pes_type] &&
 716                    demux->pesfilter[pes_type] != feed) {
 717                        mutex_unlock(&demux->mutex);
 718                        return -EINVAL;
 719                }
 720
 721                demux->pesfilter[pes_type] = feed;
 722                demux->pids[pes_type] = pid;
 723        }
 724
 725        dvb_demux_feed_add(feed);
 726
 727        feed->pid = pid;
 728        feed->timeout = timeout;
 729        feed->ts_type = ts_type;
 730        feed->pes_type = pes_type;
 731
 732        feed->state = DMX_STATE_READY;
 733        mutex_unlock(&demux->mutex);
 734
 735        return 0;
 736}
 737
 738static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 739{
 740        struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 741        struct dvb_demux *demux = feed->demux;
 742        int ret;
 743
 744        if (mutex_lock_interruptible(&demux->mutex))
 745                return -ERESTARTSYS;
 746
 747        if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 748                mutex_unlock(&demux->mutex);
 749                return -EINVAL;
 750        }
 751
 752        if (!demux->start_feed) {
 753                mutex_unlock(&demux->mutex);
 754                return -ENODEV;
 755        }
 756
 757        if ((ret = demux->start_feed(feed)) < 0) {
 758                mutex_unlock(&demux->mutex);
 759                return ret;
 760        }
 761
 762        spin_lock_irq(&demux->lock);
 763        ts_feed->is_filtering = 1;
 764        feed->state = DMX_STATE_GO;
 765        spin_unlock_irq(&demux->lock);
 766        mutex_unlock(&demux->mutex);
 767
 768        return 0;
 769}
 770
 771static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 772{
 773        struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 774        struct dvb_demux *demux = feed->demux;
 775        int ret;
 776
 777        mutex_lock(&demux->mutex);
 778
 779        if (feed->state < DMX_STATE_GO) {
 780                mutex_unlock(&demux->mutex);
 781                return -EINVAL;
 782        }
 783
 784        if (!demux->stop_feed) {
 785                mutex_unlock(&demux->mutex);
 786                return -ENODEV;
 787        }
 788
 789        ret = demux->stop_feed(feed);
 790
 791        spin_lock_irq(&demux->lock);
 792        ts_feed->is_filtering = 0;
 793        feed->state = DMX_STATE_ALLOCATED;
 794        spin_unlock_irq(&demux->lock);
 795        mutex_unlock(&demux->mutex);
 796
 797        return ret;
 798}
 799
 800static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 801                                   struct dmx_ts_feed **ts_feed,
 802                                   dmx_ts_cb callback)
 803{
 804        struct dvb_demux *demux = (struct dvb_demux *)dmx;
 805        struct dvb_demux_feed *feed;
 806
 807        if (mutex_lock_interruptible(&demux->mutex))
 808                return -ERESTARTSYS;
 809
 810        if (!(feed = dvb_dmx_feed_alloc(demux))) {
 811                mutex_unlock(&demux->mutex);
 812                return -EBUSY;
 813        }
 814
 815        feed->type = DMX_TYPE_TS;
 816        feed->cb.ts = callback;
 817        feed->demux = demux;
 818        feed->pid = 0xffff;
 819        feed->peslen = 0xfffa;
 820        feed->buffer_flags = 0;
 821
 822        (*ts_feed) = &feed->feed.ts;
 823        (*ts_feed)->parent = dmx;
 824        (*ts_feed)->priv = NULL;
 825        (*ts_feed)->is_filtering = 0;
 826        (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 827        (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 828        (*ts_feed)->set = dmx_ts_feed_set;
 829
 830        if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 831                feed->state = DMX_STATE_FREE;
 832                mutex_unlock(&demux->mutex);
 833                return -EBUSY;
 834        }
 835
 836        feed->filter->type = DMX_TYPE_TS;
 837        feed->filter->feed = feed;
 838        feed->filter->state = DMX_STATE_READY;
 839
 840        mutex_unlock(&demux->mutex);
 841
 842        return 0;
 843}
 844
 845static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 846                                  struct dmx_ts_feed *ts_feed)
 847{
 848        struct dvb_demux *demux = (struct dvb_demux *)dmx;
 849        struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 850
 851        mutex_lock(&demux->mutex);
 852
 853        if (feed->state == DMX_STATE_FREE) {
 854                mutex_unlock(&demux->mutex);
 855                return -EINVAL;
 856        }
 857
 858        feed->state = DMX_STATE_FREE;
 859        feed->filter->state = DMX_STATE_FREE;
 860
 861        dvb_demux_feed_del(feed);
 862
 863        feed->pid = 0xffff;
 864
 865        if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
 866                demux->pesfilter[feed->pes_type] = NULL;
 867
 868        mutex_unlock(&demux->mutex);
 869        return 0;
 870}
 871
 872/******************************************************************************
 873 * dmx_section_feed API calls
 874 ******************************************************************************/
 875
 876static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 877                                            struct dmx_section_filter **filter)
 878{
 879        struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 880        struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 881        struct dvb_demux_filter *dvbdmxfilter;
 882
 883        if (mutex_lock_interruptible(&dvbdemux->mutex))
 884                return -ERESTARTSYS;
 885
 886        dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 887        if (!dvbdmxfilter) {
 888                mutex_unlock(&dvbdemux->mutex);
 889                return -EBUSY;
 890        }
 891
 892        spin_lock_irq(&dvbdemux->lock);
 893        *filter = &dvbdmxfilter->filter;
 894        (*filter)->parent = feed;
 895        (*filter)->priv = NULL;
 896        dvbdmxfilter->feed = dvbdmxfeed;
 897        dvbdmxfilter->type = DMX_TYPE_SEC;
 898        dvbdmxfilter->state = DMX_STATE_READY;
 899        dvbdmxfilter->next = dvbdmxfeed->filter;
 900        dvbdmxfeed->filter = dvbdmxfilter;
 901        spin_unlock_irq(&dvbdemux->lock);
 902
 903        mutex_unlock(&dvbdemux->mutex);
 904        return 0;
 905}
 906
 907static int dmx_section_feed_set(struct dmx_section_feed *feed,
 908                                u16 pid, int check_crc)
 909{
 910        struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 911        struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 912
 913        if (pid > 0x1fff)
 914                return -EINVAL;
 915
 916        if (mutex_lock_interruptible(&dvbdmx->mutex))
 917                return -ERESTARTSYS;
 918
 919        dvb_demux_feed_add(dvbdmxfeed);
 920
 921        dvbdmxfeed->pid = pid;
 922        dvbdmxfeed->feed.sec.check_crc = check_crc;
 923
 924        dvbdmxfeed->state = DMX_STATE_READY;
 925        mutex_unlock(&dvbdmx->mutex);
 926        return 0;
 927}
 928
 929static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 930{
 931        int i;
 932        struct dvb_demux_filter *f;
 933        struct dmx_section_filter *sf;
 934        u8 mask, mode, doneq;
 935
 936        if (!(f = dvbdmxfeed->filter))
 937                return;
 938        do {
 939                sf = &f->filter;
 940                doneq = false;
 941                for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 942                        mode = sf->filter_mode[i];
 943                        mask = sf->filter_mask[i];
 944                        f->maskandmode[i] = mask & mode;
 945                        doneq |= f->maskandnotmode[i] = mask & ~mode;
 946                }
 947                f->doneq = doneq ? true : false;
 948        } while ((f = f->next));
 949}
 950
 951static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 952{
 953        struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 954        struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 955        int ret;
 956
 957        if (mutex_lock_interruptible(&dvbdmx->mutex))
 958                return -ERESTARTSYS;
 959
 960        if (feed->is_filtering) {
 961                mutex_unlock(&dvbdmx->mutex);
 962                return -EBUSY;
 963        }
 964
 965        if (!dvbdmxfeed->filter) {
 966                mutex_unlock(&dvbdmx->mutex);
 967                return -EINVAL;
 968        }
 969
 970        dvbdmxfeed->feed.sec.tsfeedp = 0;
 971        dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 972        dvbdmxfeed->feed.sec.secbufp = 0;
 973        dvbdmxfeed->feed.sec.seclen = 0;
 974        dvbdmxfeed->pusi_seen = false;
 975
 976        if (!dvbdmx->start_feed) {
 977                mutex_unlock(&dvbdmx->mutex);
 978                return -ENODEV;
 979        }
 980
 981        prepare_secfilters(dvbdmxfeed);
 982
 983        if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 984                mutex_unlock(&dvbdmx->mutex);
 985                return ret;
 986        }
 987
 988        spin_lock_irq(&dvbdmx->lock);
 989        feed->is_filtering = 1;
 990        dvbdmxfeed->state = DMX_STATE_GO;
 991        spin_unlock_irq(&dvbdmx->lock);
 992
 993        mutex_unlock(&dvbdmx->mutex);
 994        return 0;
 995}
 996
 997static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 998{
 999        struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1000        struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1001        int ret;
1002
1003        mutex_lock(&dvbdmx->mutex);
1004
1005        if (!dvbdmx->stop_feed) {
1006                mutex_unlock(&dvbdmx->mutex);
1007                return -ENODEV;
1008        }
1009
1010        ret = dvbdmx->stop_feed(dvbdmxfeed);
1011
1012        spin_lock_irq(&dvbdmx->lock);
1013        dvbdmxfeed->state = DMX_STATE_READY;
1014        feed->is_filtering = 0;
1015        spin_unlock_irq(&dvbdmx->lock);
1016
1017        mutex_unlock(&dvbdmx->mutex);
1018        return ret;
1019}
1020
1021static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
1022                                           struct dmx_section_filter *filter)
1023{
1024        struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
1025        struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1026        struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1027
1028        mutex_lock(&dvbdmx->mutex);
1029
1030        if (dvbdmxfilter->feed != dvbdmxfeed) {
1031                mutex_unlock(&dvbdmx->mutex);
1032                return -EINVAL;
1033        }
1034
1035        if (feed->is_filtering) {
1036                /* release dvbdmx->mutex as far as it is
1037                   acquired by stop_filtering() itself */
1038                mutex_unlock(&dvbdmx->mutex);
1039                feed->stop_filtering(feed);
1040                mutex_lock(&dvbdmx->mutex);
1041        }
1042
1043        spin_lock_irq(&dvbdmx->lock);
1044        f = dvbdmxfeed->filter;
1045
1046        if (f == dvbdmxfilter) {
1047                dvbdmxfeed->filter = dvbdmxfilter->next;
1048        } else {
1049                while (f->next != dvbdmxfilter)
1050                        f = f->next;
1051                f->next = f->next->next;
1052        }
1053
1054        dvbdmxfilter->state = DMX_STATE_FREE;
1055        spin_unlock_irq(&dvbdmx->lock);
1056        mutex_unlock(&dvbdmx->mutex);
1057        return 0;
1058}
1059
1060static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1061                                        struct dmx_section_feed **feed,
1062                                        dmx_section_cb callback)
1063{
1064        struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1065        struct dvb_demux_feed *dvbdmxfeed;
1066
1067        if (mutex_lock_interruptible(&dvbdmx->mutex))
1068                return -ERESTARTSYS;
1069
1070        if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1071                mutex_unlock(&dvbdmx->mutex);
1072                return -EBUSY;
1073        }
1074
1075        dvbdmxfeed->type = DMX_TYPE_SEC;
1076        dvbdmxfeed->cb.sec = callback;
1077        dvbdmxfeed->demux = dvbdmx;
1078        dvbdmxfeed->pid = 0xffff;
1079        dvbdmxfeed->buffer_flags = 0;
1080        dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1081        dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1082        dvbdmxfeed->feed.sec.tsfeedp = 0;
1083        dvbdmxfeed->filter = NULL;
1084
1085        (*feed) = &dvbdmxfeed->feed.sec;
1086        (*feed)->is_filtering = 0;
1087        (*feed)->parent = demux;
1088        (*feed)->priv = NULL;
1089
1090        (*feed)->set = dmx_section_feed_set;
1091        (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1092        (*feed)->start_filtering = dmx_section_feed_start_filtering;
1093        (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1094        (*feed)->release_filter = dmx_section_feed_release_filter;
1095
1096        mutex_unlock(&dvbdmx->mutex);
1097        return 0;
1098}
1099
1100static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1101                                       struct dmx_section_feed *feed)
1102{
1103        struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1104        struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1105
1106        mutex_lock(&dvbdmx->mutex);
1107
1108        if (dvbdmxfeed->state == DMX_STATE_FREE) {
1109                mutex_unlock(&dvbdmx->mutex);
1110                return -EINVAL;
1111        }
1112        dvbdmxfeed->state = DMX_STATE_FREE;
1113
1114        dvb_demux_feed_del(dvbdmxfeed);
1115
1116        dvbdmxfeed->pid = 0xffff;
1117
1118        mutex_unlock(&dvbdmx->mutex);
1119        return 0;
1120}
1121
1122/******************************************************************************
1123 * dvb_demux kernel data API calls
1124 ******************************************************************************/
1125
1126static int dvbdmx_open(struct dmx_demux *demux)
1127{
1128        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1129
1130        if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1131                return -EUSERS;
1132
1133        dvbdemux->users++;
1134        return 0;
1135}
1136
1137static int dvbdmx_close(struct dmx_demux *demux)
1138{
1139        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1140
1141        if (dvbdemux->users == 0)
1142                return -ENODEV;
1143
1144        dvbdemux->users--;
1145        //FIXME: release any unneeded resources if users==0
1146        return 0;
1147}
1148
1149static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1150{
1151        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1152        void *p;
1153
1154        if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1155                return -EINVAL;
1156
1157        p = memdup_user(buf, count);
1158        if (IS_ERR(p))
1159                return PTR_ERR(p);
1160        if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1161                kfree(p);
1162                return -ERESTARTSYS;
1163        }
1164        dvb_dmx_swfilter(dvbdemux, p, count);
1165        kfree(p);
1166        mutex_unlock(&dvbdemux->mutex);
1167
1168        if (signal_pending(current))
1169                return -EINTR;
1170        return count;
1171}
1172
1173static int dvbdmx_add_frontend(struct dmx_demux *demux,
1174                               struct dmx_frontend *frontend)
1175{
1176        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1177        struct list_head *head = &dvbdemux->frontend_list;
1178
1179        list_add(&(frontend->connectivity_list), head);
1180
1181        return 0;
1182}
1183
1184static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1185                                  struct dmx_frontend *frontend)
1186{
1187        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1188        struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1189
1190        list_for_each_safe(pos, n, head) {
1191                if (DMX_FE_ENTRY(pos) == frontend) {
1192                        list_del(pos);
1193                        return 0;
1194                }
1195        }
1196
1197        return -ENODEV;
1198}
1199
1200static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1201{
1202        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1203
1204        if (list_empty(&dvbdemux->frontend_list))
1205                return NULL;
1206
1207        return &dvbdemux->frontend_list;
1208}
1209
1210static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1211                                   struct dmx_frontend *frontend)
1212{
1213        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1214
1215        if (demux->frontend)
1216                return -EINVAL;
1217
1218        mutex_lock(&dvbdemux->mutex);
1219
1220        demux->frontend = frontend;
1221        mutex_unlock(&dvbdemux->mutex);
1222        return 0;
1223}
1224
1225static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1226{
1227        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1228
1229        mutex_lock(&dvbdemux->mutex);
1230
1231        demux->frontend = NULL;
1232        mutex_unlock(&dvbdemux->mutex);
1233        return 0;
1234}
1235
1236static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1237{
1238        struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1239
1240        memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1241        return 0;
1242}
1243
1244int dvb_dmx_init(struct dvb_demux *dvbdemux)
1245{
1246        int i;
1247        struct dmx_demux *dmx = &dvbdemux->dmx;
1248
1249        dvbdemux->cnt_storage = NULL;
1250        dvbdemux->users = 0;
1251        dvbdemux->filter = vmalloc(array_size(sizeof(struct dvb_demux_filter),
1252                                              dvbdemux->filternum));
1253
1254        if (!dvbdemux->filter)
1255                return -ENOMEM;
1256
1257        dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed),
1258                                            dvbdemux->feednum));
1259        if (!dvbdemux->feed) {
1260                vfree(dvbdemux->filter);
1261                dvbdemux->filter = NULL;
1262                return -ENOMEM;
1263        }
1264        for (i = 0; i < dvbdemux->filternum; i++) {
1265                dvbdemux->filter[i].state = DMX_STATE_FREE;
1266                dvbdemux->filter[i].index = i;
1267        }
1268        for (i = 0; i < dvbdemux->feednum; i++) {
1269                dvbdemux->feed[i].state = DMX_STATE_FREE;
1270                dvbdemux->feed[i].index = i;
1271        }
1272
1273        dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1274        if (!dvbdemux->cnt_storage)
1275                pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");
1276
1277        INIT_LIST_HEAD(&dvbdemux->frontend_list);
1278
1279        for (i = 0; i < DMX_PES_OTHER; i++) {
1280                dvbdemux->pesfilter[i] = NULL;
1281                dvbdemux->pids[i] = 0xffff;
1282        }
1283
1284        INIT_LIST_HEAD(&dvbdemux->feed_list);
1285
1286        dvbdemux->playing = 0;
1287        dvbdemux->recording = 0;
1288        dvbdemux->tsbufp = 0;
1289
1290        if (!dvbdemux->check_crc32)
1291                dvbdemux->check_crc32 = dvb_dmx_crc32;
1292
1293        if (!dvbdemux->memcopy)
1294                dvbdemux->memcopy = dvb_dmx_memcopy;
1295
1296        dmx->frontend = NULL;
1297        dmx->priv = dvbdemux;
1298        dmx->open = dvbdmx_open;
1299        dmx->close = dvbdmx_close;
1300        dmx->write = dvbdmx_write;
1301        dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1302        dmx->release_ts_feed = dvbdmx_release_ts_feed;
1303        dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1304        dmx->release_section_feed = dvbdmx_release_section_feed;
1305
1306        dmx->add_frontend = dvbdmx_add_frontend;
1307        dmx->remove_frontend = dvbdmx_remove_frontend;
1308        dmx->get_frontends = dvbdmx_get_frontends;
1309        dmx->connect_frontend = dvbdmx_connect_frontend;
1310        dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1311        dmx->get_pes_pids = dvbdmx_get_pes_pids;
1312
1313        mutex_init(&dvbdemux->mutex);
1314        spin_lock_init(&dvbdemux->lock);
1315
1316        return 0;
1317}
1318
1319EXPORT_SYMBOL(dvb_dmx_init);
1320
1321void dvb_dmx_release(struct dvb_demux *dvbdemux)
1322{
1323        vfree(dvbdemux->cnt_storage);
1324        vfree(dvbdemux->filter);
1325        vfree(dvbdemux->feed);
1326}
1327
1328EXPORT_SYMBOL(dvb_dmx_release);
1329
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