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[pohmelfs.git] / drivers / media / dvb / dvb-core / dvb_demux.c
blobfaa3671b649e1dd54214abf5f7bce1c4044c2bac
1 /*
2 * dvb_demux.c - DVB kernel demux API
3 *
4 * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de>
5 * & Marcus Metzler <marcus@convergence.de>
6 * for convergence integrated media GmbH
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 2.1
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 */
23
24 #include <linux/sched.h>
25 #include <linux/spinlock.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/module.h>
29 #include <linux/poll.h>
30 #include <linux/string.h>
31 #include <linux/crc32.h>
32 #include <asm/uaccess.h>
33 #include <asm/div64.h>
34
35 #include "dvb_demux.h"
36
37 #define NOBUFS
38 /*
39 ** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog
40 */
41 // #define DVB_DEMUX_SECTION_LOSS_LOG
42
43 static int dvb_demux_tscheck;
44 module_param(dvb_demux_tscheck, int, 0644);
45 MODULE_PARM_DESC(dvb_demux_tscheck,
46 "enable transport stream continuity and TEI check");
47
48 static int dvb_demux_speedcheck;
49 module_param(dvb_demux_speedcheck, int, 0644);
50 MODULE_PARM_DESC(dvb_demux_speedcheck,
51 "enable transport stream speed check");
52
53 #define dprintk_tscheck(x...) do { \
54 if (dvb_demux_tscheck && printk_ratelimit()) \
55 printk(x); \
56 } while (0)
57
58 /******************************************************************************
59 * static inlined helper functions
60 ******************************************************************************/
61
62 static inline u16 section_length(const u8 *buf)
63 {
64 return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
65 }
66
67 static inline u16 ts_pid(const u8 *buf)
68 {
69 return ((buf[1] & 0x1f) << 8) + buf[2];
70 }
71
72 static inline u8 payload(const u8 *tsp)
73 {
74 if (!(tsp[3] & 0x10)) // no payload?
75 return 0;
76
77 if (tsp[3] & 0x20) { // adaptation field?
78 if (tsp[4] > 183) // corrupted data?
79 return 0;
80 else
81 return 184 - 1 - tsp[4];
82 }
83
84 return 184;
85 }
86
87 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
88 {
89 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
90 }
91
92 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
93 size_t len)
94 {
95 memcpy(d, s, len);
96 }
97
98 /******************************************************************************
99 * Software filter functions
100 ******************************************************************************/
101
102 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
103 const u8 *buf)
104 {
105 int count = payload(buf);
106 int p;
107 //int ccok;
108 //u8 cc;
109
110 if (count == 0)
111 return -1;
112
113 p = 188 - count;
114
115 /*
116 cc = buf[3] & 0x0f;
117 ccok = ((feed->cc + 1) & 0x0f) == cc;
118 feed->cc = cc;
119 if (!ccok)
120 printk("missed packet!\n");
121 */
122
123 if (buf[1] & 0x40) // PUSI ?
124 feed->peslen = 0xfffa;
125
126 feed->peslen += count;
127
128 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
129 }
130
131 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
132 struct dvb_demux_filter *f)
133 {
134 u8 neq = 0;
135 int i;
136
137 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
138 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
139
140 if (f->maskandmode[i] & xor)
141 return 0;
142
143 neq |= f->maskandnotmode[i] & xor;
144 }
145
146 if (f->doneq && !neq)
147 return 0;
148
149 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
150 NULL, 0, &f->filter, DMX_OK);
151 }
152
153 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
154 {
155 struct dvb_demux *demux = feed->demux;
156 struct dvb_demux_filter *f = feed->filter;
157 struct dmx_section_feed *sec = &feed->feed.sec;
158 int section_syntax_indicator;
159
160 if (!sec->is_filtering)
161 return 0;
162
163 if (!f)
164 return 0;
165
166 if (sec->check_crc) {
167 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
168 if (section_syntax_indicator &&
169 demux->check_crc32(feed, sec->secbuf, sec->seclen))
170 return -1;
171 }
172
173 do {
174 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
175 return -1;
176 } while ((f = f->next) && sec->is_filtering);
177
178 sec->seclen = 0;
179
180 return 0;
181 }
182
183 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
184 {
185 struct dmx_section_feed *sec = &feed->feed.sec;
186
187 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
188 if (sec->secbufp < sec->tsfeedp) {
189 int i, n = sec->tsfeedp - sec->secbufp;
190
191 /*
192 * Section padding is done with 0xff bytes entirely.
193 * Due to speed reasons, we won't check all of them
194 * but just first and last.
195 */
196 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
197 printk("dvb_demux.c section ts padding loss: %d/%d\n",
198 n, sec->tsfeedp);
199 printk("dvb_demux.c pad data:");
200 for (i = 0; i < n; i++)
201 printk(" %02x", sec->secbuf[i]);
202 printk("\n");
203 }
204 }
205 #endif
206
207 sec->tsfeedp = sec->secbufp = sec->seclen = 0;
208 sec->secbuf = sec->secbuf_base;
209 }
210
211 /*
212 * Losless Section Demux 1.4.1 by Emard
213 * Valsecchi Patrick:
214 * - middle of section A (no PUSI)
215 * - end of section A and start of section B
216 * (with PUSI pointing to the start of the second section)
217 *
218 * In this case, without feed->pusi_seen you'll receive a garbage section
219 * consisting of the end of section A. Basically because tsfeedp
220 * is incemented and the use=0 condition is not raised
221 * when the second packet arrives.
222 *
223 * Fix:
224 * when demux is started, let feed->pusi_seen = 0 to
225 * prevent initial feeding of garbage from the end of
226 * previous section. When you for the first time see PUSI=1
227 * then set feed->pusi_seen = 1
228 */
229 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
230 const u8 *buf, u8 len)
231 {
232 struct dvb_demux *demux = feed->demux;
233 struct dmx_section_feed *sec = &feed->feed.sec;
234 u16 limit, seclen, n;
235
236 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
237 return 0;
238
239 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
240 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
241 printk("dvb_demux.c section buffer full loss: %d/%d\n",
242 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
243 DMX_MAX_SECFEED_SIZE);
244 #endif
245 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
246 }
247
248 if (len <= 0)
249 return 0;
250
251 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
252 sec->tsfeedp += len;
253
254 /*
255 * Dump all the sections we can find in the data (Emard)
256 */
257 limit = sec->tsfeedp;
258 if (limit > DMX_MAX_SECFEED_SIZE)
259 return -1; /* internal error should never happen */
260
261 /* to be sure always set secbuf */
262 sec->secbuf = sec->secbuf_base + sec->secbufp;
263
264 for (n = 0; sec->secbufp + 2 < limit; n++) {
265 seclen = section_length(sec->secbuf);
266 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
267 || seclen + sec->secbufp > limit)
268 return 0;
269 sec->seclen = seclen;
270 sec->crc_val = ~0;
271 /* dump [secbuf .. secbuf+seclen) */
272 if (feed->pusi_seen)
273 dvb_dmx_swfilter_section_feed(feed);
274 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
275 else
276 printk("dvb_demux.c pusi not seen, discarding section data\n");
277 #endif
278 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
279 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */
280 }
281
282 return 0;
283 }
284
285 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
286 const u8 *buf)
287 {
288 u8 p, count;
289 int ccok, dc_i = 0;
290 u8 cc;
291
292 count = payload(buf);
293
294 if (count == 0) /* count == 0 if no payload or out of range */
295 return -1;
296
297 p = 188 - count; /* payload start */
298
299 cc = buf[3] & 0x0f;
300 ccok = ((feed->cc + 1) & 0x0f) == cc;
301 feed->cc = cc;
302
303 if (buf[3] & 0x20) {
304 /* adaption field present, check for discontinuity_indicator */
305 if ((buf[4] > 0) && (buf[5] & 0x80))
306 dc_i = 1;
307 }
308
309 if (!ccok || dc_i) {
310 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
311 printk("dvb_demux.c discontinuity detected %d bytes lost\n",
312 count);
313 /*
314 * those bytes under sume circumstances will again be reported
315 * in the following dvb_dmx_swfilter_section_new
316 */
317 #endif
318 /*
319 * Discontinuity detected. Reset pusi_seen = 0 to
320 * stop feeding of suspicious data until next PUSI=1 arrives
321 */
322 feed->pusi_seen = 0;
323 dvb_dmx_swfilter_section_new(feed);
324 }
325
326 if (buf[1] & 0x40) {
327 /* PUSI=1 (is set), section boundary is here */
328 if (count > 1 && buf[p] < count) {
329 const u8 *before = &buf[p + 1];
330 u8 before_len = buf[p];
331 const u8 *after = &before[before_len];
332 u8 after_len = count - 1 - before_len;
333
334 dvb_dmx_swfilter_section_copy_dump(feed, before,
335 before_len);
336 /* before start of new section, set pusi_seen = 1 */
337 feed->pusi_seen = 1;
338 dvb_dmx_swfilter_section_new(feed);
339 dvb_dmx_swfilter_section_copy_dump(feed, after,
340 after_len);
341 }
342 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
343 else if (count > 0)
344 printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
345 #endif
346 } else {
347 /* PUSI=0 (is not set), no section boundary */
348 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
349 }
350
351 return 0;
352 }
353
354 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
355 const u8 *buf)
356 {
357 switch (feed->type) {
358 case DMX_TYPE_TS:
359 if (!feed->feed.ts.is_filtering)
360 break;
361 if (feed->ts_type & TS_PACKET) {
362 if (feed->ts_type & TS_PAYLOAD_ONLY)
363 dvb_dmx_swfilter_payload(feed, buf);
364 else
365 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
366 DMX_OK);
367 }
368 if (feed->ts_type & TS_DECODER)
369 if (feed->demux->write_to_decoder)
370 feed->demux->write_to_decoder(feed, buf, 188);
371 break;
372
373 case DMX_TYPE_SEC:
374 if (!feed->feed.sec.is_filtering)
375 break;
376 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
377 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
378 break;
379
380 default:
381 break;
382 }
383 }
384
385 #define DVR_FEED(f) \
386 (((f)->type == DMX_TYPE_TS) && \
387 ((f)->feed.ts.is_filtering) && \
388 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
389
390 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
391 {
392 struct dvb_demux_feed *feed;
393 u16 pid = ts_pid(buf);
394 int dvr_done = 0;
395
396 if (dvb_demux_speedcheck) {
397 struct timespec cur_time, delta_time;
398 u64 speed_bytes, speed_timedelta;
399
400 demux->speed_pkts_cnt++;
401
402 /* show speed every SPEED_PKTS_INTERVAL packets */
403 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
404 cur_time = current_kernel_time();
405
406 if (demux->speed_last_time.tv_sec != 0 &&
407 demux->speed_last_time.tv_nsec != 0) {
408 delta_time = timespec_sub(cur_time,
409 demux->speed_last_time);
410 speed_bytes = (u64)demux->speed_pkts_cnt
411 * 188 * 8;
412 /* convert to 1024 basis */
413 speed_bytes = 1000 * div64_u64(speed_bytes,
414 1024);
415 speed_timedelta =
416 (u64)timespec_to_ns(&delta_time);
417 speed_timedelta = div64_u64(speed_timedelta,
418 1000000); /* nsec -> usec */
419 printk(KERN_INFO "TS speed %llu Kbits/sec \n",
420 div64_u64(speed_bytes,
421 speed_timedelta));
422 };
423
424 demux->speed_last_time = cur_time;
425 demux->speed_pkts_cnt = 0;
426 };
427 };
428
429 if (demux->cnt_storage && dvb_demux_tscheck) {
430 /* check pkt counter */
431 if (pid < MAX_PID) {
432 if (buf[1] & 0x80)
433 dprintk_tscheck("TEI detected. "
434 "PID=0x%x data1=0x%x\n",
435 pid, buf[1]);
436
437 if ((buf[3] & 0xf) != demux->cnt_storage[pid])
438 dprintk_tscheck("TS packet counter mismatch. "
439 "PID=0x%x expected 0x%x "
440 "got 0x%x\n",
441 pid, demux->cnt_storage[pid],
442 buf[3] & 0xf);
443
444 demux->cnt_storage[pid] = ((buf[3] & 0xf) + 1)&0xf;
445 };
446 /* end check */
447 };
448
449 list_for_each_entry(feed, &demux->feed_list, list_head) {
450 if ((feed->pid != pid) && (feed->pid != 0x2000))
451 continue;
452
453 /* copy each packet only once to the dvr device, even
454 * if a PID is in multiple filters (e.g. video + PCR) */
455 if ((DVR_FEED(feed)) && (dvr_done++))
456 continue;
457
458 if (feed->pid == pid)
459 dvb_dmx_swfilter_packet_type(feed, buf);
460 else if (feed->pid == 0x2000)
461 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
462 }
463 }
464
465 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
466 size_t count)
467 {
468 spin_lock(&demux->lock);
469
470 while (count--) {
471 if (buf[0] == 0x47)
472 dvb_dmx_swfilter_packet(demux, buf);
473 buf += 188;
474 }
475
476 spin_unlock(&demux->lock);
477 }
478
479 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
480
481 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
482 const int pktsize)
483 {
484 int start = pos, lost;
485
486 while (pos < count) {
487 if (buf[pos] == 0x47 ||
488 (pktsize == 204 && buf[pos] == 0xB8))
489 break;
490 pos++;
491 }
492
493 lost = pos - start;
494 if (lost) {
495 /* This garbage is part of a valid packet? */
496 int backtrack = pos - pktsize;
497 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
498 (pktsize == 204 && buf[backtrack] == 0xB8)))
499 return backtrack;
500 }
501
502 return pos;
503 }
504
505 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
506 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
507 size_t count, const int pktsize)
508 {
509 int p = 0, i, j;
510 const u8 *q;
511
512 spin_lock(&demux->lock);
513
514 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
515 i = demux->tsbufp;
516 j = pktsize - i;
517 if (count < j) {
518 memcpy(&demux->tsbuf[i], buf, count);
519 demux->tsbufp += count;
520 goto bailout;
521 }
522 memcpy(&demux->tsbuf[i], buf, j);
523 if (demux->tsbuf[0] == 0x47) /* double check */
524 dvb_dmx_swfilter_packet(demux, demux->tsbuf);
525 demux->tsbufp = 0;
526 p += j;
527 }
528
529 while (1) {
530 p = find_next_packet(buf, p, count, pktsize);
531 if (p >= count)
532 break;
533 if (count - p < pktsize)
534 break;
535
536 q = &buf[p];
537
538 if (pktsize == 204 && (*q == 0xB8)) {
539 memcpy(demux->tsbuf, q, 188);
540 demux->tsbuf[0] = 0x47;
541 q = demux->tsbuf;
542 }
543 dvb_dmx_swfilter_packet(demux, q);
544 p += pktsize;
545 }
546
547 i = count - p;
548 if (i) {
549 memcpy(demux->tsbuf, &buf[p], i);
550 demux->tsbufp = i;
551 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
552 demux->tsbuf[0] = 0x47;
553 }
554
555 bailout:
556 spin_unlock(&demux->lock);
557 }
558
559 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
560 {
561 _dvb_dmx_swfilter(demux, buf, count, 188);
562 }
563 EXPORT_SYMBOL(dvb_dmx_swfilter);
564
565 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
566 {
567 _dvb_dmx_swfilter(demux, buf, count, 204);
568 }
569 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
570
571 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
572 {
573 int i;
574
575 for (i = 0; i < demux->filternum; i++)
576 if (demux->filter[i].state == DMX_STATE_FREE)
577 break;
578
579 if (i == demux->filternum)
580 return NULL;
581
582 demux->filter[i].state = DMX_STATE_ALLOCATED;
583
584 return &demux->filter[i];
585 }
586
587 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
588 {
589 int i;
590
591 for (i = 0; i < demux->feednum; i++)
592 if (demux->feed[i].state == DMX_STATE_FREE)
593 break;
594
595 if (i == demux->feednum)
596 return NULL;
597
598 demux->feed[i].state = DMX_STATE_ALLOCATED;
599
600 return &demux->feed[i];
601 }
602
603 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
604 {
605 struct dvb_demux_feed *entry;
606
607 list_for_each_entry(entry, &feed->demux->feed_list, list_head)
608 if (entry == feed)
609 return 1;
610
611 return 0;
612 }
613
614 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
615 {
616 spin_lock_irq(&feed->demux->lock);
617 if (dvb_demux_feed_find(feed)) {
618 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
619 __func__, feed->type, feed->state, feed->pid);
620 goto out;
621 }
622
623 list_add(&feed->list_head, &feed->demux->feed_list);
624 out:
625 spin_unlock_irq(&feed->demux->lock);
626 }
627
628 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
629 {
630 spin_lock_irq(&feed->demux->lock);
631 if (!(dvb_demux_feed_find(feed))) {
632 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
633 __func__, feed->type, feed->state, feed->pid);
634 goto out;
635 }
636
637 list_del(&feed->list_head);
638 out:
639 spin_unlock_irq(&feed->demux->lock);
640 }
641
642 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
643 enum dmx_ts_pes pes_type,
644 size_t circular_buffer_size, struct timespec timeout)
645 {
646 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
647 struct dvb_demux *demux = feed->demux;
648
649 if (pid > DMX_MAX_PID)
650 return -EINVAL;
651
652 if (mutex_lock_interruptible(&demux->mutex))
653 return -ERESTARTSYS;
654
655 if (ts_type & TS_DECODER) {
656 if (pes_type >= DMX_TS_PES_OTHER) {
657 mutex_unlock(&demux->mutex);
658 return -EINVAL;
659 }
660
661 if (demux->pesfilter[pes_type] &&
662 demux->pesfilter[pes_type] != feed) {
663 mutex_unlock(&demux->mutex);
664 return -EINVAL;
665 }
666
667 demux->pesfilter[pes_type] = feed;
668 demux->pids[pes_type] = pid;
669 }
670
671 dvb_demux_feed_add(feed);
672
673 feed->pid = pid;
674 feed->buffer_size = circular_buffer_size;
675 feed->timeout = timeout;
676 feed->ts_type = ts_type;
677 feed->pes_type = pes_type;
678
679 if (feed->buffer_size) {
680 #ifdef NOBUFS
681 feed->buffer = NULL;
682 #else
683 feed->buffer = vmalloc(feed->buffer_size);
684 if (!feed->buffer) {
685 mutex_unlock(&demux->mutex);
686 return -ENOMEM;
687 }
688 #endif
689 }
690
691 feed->state = DMX_STATE_READY;
692 mutex_unlock(&demux->mutex);
693
694 return 0;
695 }
696
697 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
698 {
699 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
700 struct dvb_demux *demux = feed->demux;
701 int ret;
702
703 if (mutex_lock_interruptible(&demux->mutex))
704 return -ERESTARTSYS;
705
706 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
707 mutex_unlock(&demux->mutex);
708 return -EINVAL;
709 }
710
711 if (!demux->start_feed) {
712 mutex_unlock(&demux->mutex);
713 return -ENODEV;
714 }
715
716 if ((ret = demux->start_feed(feed)) < 0) {
717 mutex_unlock(&demux->mutex);
718 return ret;
719 }
720
721 spin_lock_irq(&demux->lock);
722 ts_feed->is_filtering = 1;
723 feed->state = DMX_STATE_GO;
724 spin_unlock_irq(&demux->lock);
725 mutex_unlock(&demux->mutex);
726
727 return 0;
728 }
729
730 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
731 {
732 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
733 struct dvb_demux *demux = feed->demux;
734 int ret;
735
736 mutex_lock(&demux->mutex);
737
738 if (feed->state < DMX_STATE_GO) {
739 mutex_unlock(&demux->mutex);
740 return -EINVAL;
741 }
742
743 if (!demux->stop_feed) {
744 mutex_unlock(&demux->mutex);
745 return -ENODEV;
746 }
747
748 ret = demux->stop_feed(feed);
749
750 spin_lock_irq(&demux->lock);
751 ts_feed->is_filtering = 0;
752 feed->state = DMX_STATE_ALLOCATED;
753 spin_unlock_irq(&demux->lock);
754 mutex_unlock(&demux->mutex);
755
756 return ret;
757 }
758
759 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
760 struct dmx_ts_feed **ts_feed,
761 dmx_ts_cb callback)
762 {
763 struct dvb_demux *demux = (struct dvb_demux *)dmx;
764 struct dvb_demux_feed *feed;
765
766 if (mutex_lock_interruptible(&demux->mutex))
767 return -ERESTARTSYS;
768
769 if (!(feed = dvb_dmx_feed_alloc(demux))) {
770 mutex_unlock(&demux->mutex);
771 return -EBUSY;
772 }
773
774 feed->type = DMX_TYPE_TS;
775 feed->cb.ts = callback;
776 feed->demux = demux;
777 feed->pid = 0xffff;
778 feed->peslen = 0xfffa;
779 feed->buffer = NULL;
780
781 (*ts_feed) = &feed->feed.ts;
782 (*ts_feed)->parent = dmx;
783 (*ts_feed)->priv = NULL;
784 (*ts_feed)->is_filtering = 0;
785 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
786 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
787 (*ts_feed)->set = dmx_ts_feed_set;
788
789 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
790 feed->state = DMX_STATE_FREE;
791 mutex_unlock(&demux->mutex);
792 return -EBUSY;
793 }
794
795 feed->filter->type = DMX_TYPE_TS;
796 feed->filter->feed = feed;
797 feed->filter->state = DMX_STATE_READY;
798
799 mutex_unlock(&demux->mutex);
800
801 return 0;
802 }
803
804 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
805 struct dmx_ts_feed *ts_feed)
806 {
807 struct dvb_demux *demux = (struct dvb_demux *)dmx;
808 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
809
810 mutex_lock(&demux->mutex);
811
812 if (feed->state == DMX_STATE_FREE) {
813 mutex_unlock(&demux->mutex);
814 return -EINVAL;
815 }
816 #ifndef NOBUFS
817 vfree(feed->buffer);
818 feed->buffer = NULL;
819 #endif
820
821 feed->state = DMX_STATE_FREE;
822 feed->filter->state = DMX_STATE_FREE;
823
824 dvb_demux_feed_del(feed);
825
826 feed->pid = 0xffff;
827
828 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_TS_PES_OTHER)
829 demux->pesfilter[feed->pes_type] = NULL;
830
831 mutex_unlock(&demux->mutex);
832 return 0;
833 }
834
835 /******************************************************************************
836 * dmx_section_feed API calls
837 ******************************************************************************/
838
839 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
840 struct dmx_section_filter **filter)
841 {
842 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
843 struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
844 struct dvb_demux_filter *dvbdmxfilter;
845
846 if (mutex_lock_interruptible(&dvbdemux->mutex))
847 return -ERESTARTSYS;
848
849 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
850 if (!dvbdmxfilter) {
851 mutex_unlock(&dvbdemux->mutex);
852 return -EBUSY;
853 }
854
855 spin_lock_irq(&dvbdemux->lock);
856 *filter = &dvbdmxfilter->filter;
857 (*filter)->parent = feed;
858 (*filter)->priv = NULL;
859 dvbdmxfilter->feed = dvbdmxfeed;
860 dvbdmxfilter->type = DMX_TYPE_SEC;
861 dvbdmxfilter->state = DMX_STATE_READY;
862 dvbdmxfilter->next = dvbdmxfeed->filter;
863 dvbdmxfeed->filter = dvbdmxfilter;
864 spin_unlock_irq(&dvbdemux->lock);
865
866 mutex_unlock(&dvbdemux->mutex);
867 return 0;
868 }
869
870 static int dmx_section_feed_set(struct dmx_section_feed *feed,
871 u16 pid, size_t circular_buffer_size,
872 int check_crc)
873 {
874 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
875 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
876
877 if (pid > 0x1fff)
878 return -EINVAL;
879
880 if (mutex_lock_interruptible(&dvbdmx->mutex))
881 return -ERESTARTSYS;
882
883 dvb_demux_feed_add(dvbdmxfeed);
884
885 dvbdmxfeed->pid = pid;
886 dvbdmxfeed->buffer_size = circular_buffer_size;
887 dvbdmxfeed->feed.sec.check_crc = check_crc;
888
889 #ifdef NOBUFS
890 dvbdmxfeed->buffer = NULL;
891 #else
892 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
893 if (!dvbdmxfeed->buffer) {
894 mutex_unlock(&dvbdmx->mutex);
895 return -ENOMEM;
896 }
897 #endif
898
899 dvbdmxfeed->state = DMX_STATE_READY;
900 mutex_unlock(&dvbdmx->mutex);
901 return 0;
902 }
903
904 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
905 {
906 int i;
907 struct dvb_demux_filter *f;
908 struct dmx_section_filter *sf;
909 u8 mask, mode, doneq;
910
911 if (!(f = dvbdmxfeed->filter))
912 return;
913 do {
914 sf = &f->filter;
915 doneq = 0;
916 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
917 mode = sf->filter_mode[i];
918 mask = sf->filter_mask[i];
919 f->maskandmode[i] = mask & mode;
920 doneq |= f->maskandnotmode[i] = mask & ~mode;
921 }
922 f->doneq = doneq ? 1 : 0;
923 } while ((f = f->next));
924 }
925
926 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
927 {
928 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
929 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
930 int ret;
931
932 if (mutex_lock_interruptible(&dvbdmx->mutex))
933 return -ERESTARTSYS;
934
935 if (feed->is_filtering) {
936 mutex_unlock(&dvbdmx->mutex);
937 return -EBUSY;
938 }
939
940 if (!dvbdmxfeed->filter) {
941 mutex_unlock(&dvbdmx->mutex);
942 return -EINVAL;
943 }
944
945 dvbdmxfeed->feed.sec.tsfeedp = 0;
946 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
947 dvbdmxfeed->feed.sec.secbufp = 0;
948 dvbdmxfeed->feed.sec.seclen = 0;
949
950 if (!dvbdmx->start_feed) {
951 mutex_unlock(&dvbdmx->mutex);
952 return -ENODEV;
953 }
954
955 prepare_secfilters(dvbdmxfeed);
956
957 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
958 mutex_unlock(&dvbdmx->mutex);
959 return ret;
960 }
961
962 spin_lock_irq(&dvbdmx->lock);
963 feed->is_filtering = 1;
964 dvbdmxfeed->state = DMX_STATE_GO;
965 spin_unlock_irq(&dvbdmx->lock);
966
967 mutex_unlock(&dvbdmx->mutex);
968 return 0;
969 }
970
971 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
972 {
973 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
974 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
975 int ret;
976
977 mutex_lock(&dvbdmx->mutex);
978
979 if (!dvbdmx->stop_feed) {
980 mutex_unlock(&dvbdmx->mutex);
981 return -ENODEV;
982 }
983
984 ret = dvbdmx->stop_feed(dvbdmxfeed);
985
986 spin_lock_irq(&dvbdmx->lock);
987 dvbdmxfeed->state = DMX_STATE_READY;
988 feed->is_filtering = 0;
989 spin_unlock_irq(&dvbdmx->lock);
990
991 mutex_unlock(&dvbdmx->mutex);
992 return ret;
993 }
994
995 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
996 struct dmx_section_filter *filter)
997 {
998 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
999 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1000 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1001
1002 mutex_lock(&dvbdmx->mutex);
1003
1004 if (dvbdmxfilter->feed != dvbdmxfeed) {
1005 mutex_unlock(&dvbdmx->mutex);
1006 return -EINVAL;
1007 }
1008
1009 if (feed->is_filtering)
1010 feed->stop_filtering(feed);
1011
1012 spin_lock_irq(&dvbdmx->lock);
1013 f = dvbdmxfeed->filter;
1014
1015 if (f == dvbdmxfilter) {
1016 dvbdmxfeed->filter = dvbdmxfilter->next;
1017 } else {
1018 while (f->next != dvbdmxfilter)
1019 f = f->next;
1020 f->next = f->next->next;
1021 }
1022
1023 dvbdmxfilter->state = DMX_STATE_FREE;
1024 spin_unlock_irq(&dvbdmx->lock);
1025 mutex_unlock(&dvbdmx->mutex);
1026 return 0;
1027 }
1028
1029 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1030 struct dmx_section_feed **feed,
1031 dmx_section_cb callback)
1032 {
1033 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1034 struct dvb_demux_feed *dvbdmxfeed;
1035
1036 if (mutex_lock_interruptible(&dvbdmx->mutex))
1037 return -ERESTARTSYS;
1038
1039 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1040 mutex_unlock(&dvbdmx->mutex);
1041 return -EBUSY;
1042 }
1043
1044 dvbdmxfeed->type = DMX_TYPE_SEC;
1045 dvbdmxfeed->cb.sec = callback;
1046 dvbdmxfeed->demux = dvbdmx;
1047 dvbdmxfeed->pid = 0xffff;
1048 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1049 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1050 dvbdmxfeed->feed.sec.tsfeedp = 0;
1051 dvbdmxfeed->filter = NULL;
1052 dvbdmxfeed->buffer = NULL;
1053
1054 (*feed) = &dvbdmxfeed->feed.sec;
1055 (*feed)->is_filtering = 0;
1056 (*feed)->parent = demux;
1057 (*feed)->priv = NULL;
1058
1059 (*feed)->set = dmx_section_feed_set;
1060 (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1061 (*feed)->start_filtering = dmx_section_feed_start_filtering;
1062 (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1063 (*feed)->release_filter = dmx_section_feed_release_filter;
1064
1065 mutex_unlock(&dvbdmx->mutex);
1066 return 0;
1067 }
1068
1069 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1070 struct dmx_section_feed *feed)
1071 {
1072 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1073 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1074
1075 mutex_lock(&dvbdmx->mutex);
1076
1077 if (dvbdmxfeed->state == DMX_STATE_FREE) {
1078 mutex_unlock(&dvbdmx->mutex);
1079 return -EINVAL;
1080 }
1081 #ifndef NOBUFS
1082 vfree(dvbdmxfeed->buffer);
1083 dvbdmxfeed->buffer = NULL;
1084 #endif
1085 dvbdmxfeed->state = DMX_STATE_FREE;
1086
1087 dvb_demux_feed_del(dvbdmxfeed);
1088
1089 dvbdmxfeed->pid = 0xffff;
1090
1091 mutex_unlock(&dvbdmx->mutex);
1092 return 0;
1093 }
1094
1095 /******************************************************************************
1096 * dvb_demux kernel data API calls
1097 ******************************************************************************/
1098
1099 static int dvbdmx_open(struct dmx_demux *demux)
1100 {
1101 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1102
1103 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1104 return -EUSERS;
1105
1106 dvbdemux->users++;
1107 return 0;
1108 }
1109
1110 static int dvbdmx_close(struct dmx_demux *demux)
1111 {
1112 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1113
1114 if (dvbdemux->users == 0)
1115 return -ENODEV;
1116
1117 dvbdemux->users--;
1118 //FIXME: release any unneeded resources if users==0
1119 return 0;
1120 }
1121
1122 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1123 {
1124 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1125 void *p;
1126
1127 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1128 return -EINVAL;
1129
1130 p = memdup_user(buf, count);
1131 if (IS_ERR(p))
1132 return PTR_ERR(p);
1133 if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1134 kfree(p);
1135 return -ERESTARTSYS;
1136 }
1137 dvb_dmx_swfilter(dvbdemux, p, count);
1138 kfree(p);
1139 mutex_unlock(&dvbdemux->mutex);
1140
1141 if (signal_pending(current))
1142 return -EINTR;
1143 return count;
1144 }
1145
1146 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1147 struct dmx_frontend *frontend)
1148 {
1149 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1150 struct list_head *head = &dvbdemux->frontend_list;
1151
1152 list_add(&(frontend->connectivity_list), head);
1153
1154 return 0;
1155 }
1156
1157 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1158 struct dmx_frontend *frontend)
1159 {
1160 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1161 struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1162
1163 list_for_each_safe(pos, n, head) {
1164 if (DMX_FE_ENTRY(pos) == frontend) {
1165 list_del(pos);
1166 return 0;
1167 }
1168 }
1169
1170 return -ENODEV;
1171 }
1172
1173 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1174 {
1175 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1176
1177 if (list_empty(&dvbdemux->frontend_list))
1178 return NULL;
1179
1180 return &dvbdemux->frontend_list;
1181 }
1182
1183 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1184 struct dmx_frontend *frontend)
1185 {
1186 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1187
1188 if (demux->frontend)
1189 return -EINVAL;
1190
1191 mutex_lock(&dvbdemux->mutex);
1192
1193 demux->frontend = frontend;
1194 mutex_unlock(&dvbdemux->mutex);
1195 return 0;
1196 }
1197
1198 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1199 {
1200 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1201
1202 mutex_lock(&dvbdemux->mutex);
1203
1204 demux->frontend = NULL;
1205 mutex_unlock(&dvbdemux->mutex);
1206 return 0;
1207 }
1208
1209 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1210 {
1211 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1212
1213 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1214 return 0;
1215 }
1216
1217 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1218 {
1219 int i;
1220 struct dmx_demux *dmx = &dvbdemux->dmx;
1221
1222 dvbdemux->cnt_storage = NULL;
1223 dvbdemux->users = 0;
1224 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1225
1226 if (!dvbdemux->filter)
1227 return -ENOMEM;
1228
1229 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1230 if (!dvbdemux->feed) {
1231 vfree(dvbdemux->filter);
1232 dvbdemux->filter = NULL;
1233 return -ENOMEM;
1234 }
1235 for (i = 0; i < dvbdemux->filternum; i++) {
1236 dvbdemux->filter[i].state = DMX_STATE_FREE;
1237 dvbdemux->filter[i].index = i;
1238 }
1239 for (i = 0; i < dvbdemux->feednum; i++) {
1240 dvbdemux->feed[i].state = DMX_STATE_FREE;
1241 dvbdemux->feed[i].index = i;
1242 }
1243
1244 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1245 if (!dvbdemux->cnt_storage)
1246 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
1247
1248 INIT_LIST_HEAD(&dvbdemux->frontend_list);
1249
1250 for (i = 0; i < DMX_TS_PES_OTHER; i++) {
1251 dvbdemux->pesfilter[i] = NULL;
1252 dvbdemux->pids[i] = 0xffff;
1253 }
1254
1255 INIT_LIST_HEAD(&dvbdemux->feed_list);
1256
1257 dvbdemux->playing = 0;
1258 dvbdemux->recording = 0;
1259 dvbdemux->tsbufp = 0;
1260
1261 if (!dvbdemux->check_crc32)
1262 dvbdemux->check_crc32 = dvb_dmx_crc32;
1263
1264 if (!dvbdemux->memcopy)
1265 dvbdemux->memcopy = dvb_dmx_memcopy;
1266
1267 dmx->frontend = NULL;
1268 dmx->priv = dvbdemux;
1269 dmx->open = dvbdmx_open;
1270 dmx->close = dvbdmx_close;
1271 dmx->write = dvbdmx_write;
1272 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1273 dmx->release_ts_feed = dvbdmx_release_ts_feed;
1274 dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1275 dmx->release_section_feed = dvbdmx_release_section_feed;
1276
1277 dmx->add_frontend = dvbdmx_add_frontend;
1278 dmx->remove_frontend = dvbdmx_remove_frontend;
1279 dmx->get_frontends = dvbdmx_get_frontends;
1280 dmx->connect_frontend = dvbdmx_connect_frontend;
1281 dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1282 dmx->get_pes_pids = dvbdmx_get_pes_pids;
1283
1284 mutex_init(&dvbdemux->mutex);
1285 spin_lock_init(&dvbdemux->lock);
1286
1287 return 0;
1288 }
1289
1290 EXPORT_SYMBOL(dvb_dmx_init);
1291
1292 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1293 {
1294 vfree(dvbdemux->cnt_storage);
1295 vfree(dvbdemux->filter);
1296 vfree(dvbdemux->feed);
1297 }
1298
1299 EXPORT_SYMBOL(dvb_dmx_release);