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Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[cris-mirror.git] / drivers / media / dvb / dvb-core / dvb_demux.c
blob4a88a3e4db2b5d4a7e510523a375abf90a95d647
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 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
482 {
483 int p = 0, i, j;
484
485 spin_lock(&demux->lock);
486
487 if (demux->tsbufp) {
488 i = demux->tsbufp;
489 j = 188 - i;
490 if (count < j) {
491 memcpy(&demux->tsbuf[i], buf, count);
492 demux->tsbufp += count;
493 goto bailout;
494 }
495 memcpy(&demux->tsbuf[i], buf, j);
496 if (demux->tsbuf[0] == 0x47)
497 dvb_dmx_swfilter_packet(demux, demux->tsbuf);
498 demux->tsbufp = 0;
499 p += j;
500 }
501
502 while (p < count) {
503 if (buf[p] == 0x47) {
504 if (count - p >= 188) {
505 dvb_dmx_swfilter_packet(demux, &buf[p]);
506 p += 188;
507 } else {
508 i = count - p;
509 memcpy(demux->tsbuf, &buf[p], i);
510 demux->tsbufp = i;
511 goto bailout;
512 }
513 } else
514 p++;
515 }
516
517 bailout:
518 spin_unlock(&demux->lock);
519 }
520
521 EXPORT_SYMBOL(dvb_dmx_swfilter);
522
523 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
524 {
525 int p = 0, i, j;
526 u8 tmppack[188];
527
528 spin_lock(&demux->lock);
529
530 if (demux->tsbufp) {
531 i = demux->tsbufp;
532 j = 204 - i;
533 if (count < j) {
534 memcpy(&demux->tsbuf[i], buf, count);
535 demux->tsbufp += count;
536 goto bailout;
537 }
538 memcpy(&demux->tsbuf[i], buf, j);
539 if ((demux->tsbuf[0] == 0x47) || (demux->tsbuf[0] == 0xB8)) {
540 memcpy(tmppack, demux->tsbuf, 188);
541 if (tmppack[0] == 0xB8)
542 tmppack[0] = 0x47;
543 dvb_dmx_swfilter_packet(demux, tmppack);
544 }
545 demux->tsbufp = 0;
546 p += j;
547 }
548
549 while (p < count) {
550 if ((buf[p] == 0x47) || (buf[p] == 0xB8)) {
551 if (count - p >= 204) {
552 memcpy(tmppack, &buf[p], 188);
553 if (tmppack[0] == 0xB8)
554 tmppack[0] = 0x47;
555 dvb_dmx_swfilter_packet(demux, tmppack);
556 p += 204;
557 } else {
558 i = count - p;
559 memcpy(demux->tsbuf, &buf[p], i);
560 demux->tsbufp = i;
561 goto bailout;
562 }
563 } else {
564 p++;
565 }
566 }
567
568 bailout:
569 spin_unlock(&demux->lock);
570 }
571
572 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
573
574 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
575 {
576 int i;
577
578 for (i = 0; i < demux->filternum; i++)
579 if (demux->filter[i].state == DMX_STATE_FREE)
580 break;
581
582 if (i == demux->filternum)
583 return NULL;
584
585 demux->filter[i].state = DMX_STATE_ALLOCATED;
586
587 return &demux->filter[i];
588 }
589
590 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
591 {
592 int i;
593
594 for (i = 0; i < demux->feednum; i++)
595 if (demux->feed[i].state == DMX_STATE_FREE)
596 break;
597
598 if (i == demux->feednum)
599 return NULL;
600
601 demux->feed[i].state = DMX_STATE_ALLOCATED;
602
603 return &demux->feed[i];
604 }
605
606 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
607 {
608 struct dvb_demux_feed *entry;
609
610 list_for_each_entry(entry, &feed->demux->feed_list, list_head)
611 if (entry == feed)
612 return 1;
613
614 return 0;
615 }
616
617 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
618 {
619 spin_lock_irq(&feed->demux->lock);
620 if (dvb_demux_feed_find(feed)) {
621 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
622 __func__, feed->type, feed->state, feed->pid);
623 goto out;
624 }
625
626 list_add(&feed->list_head, &feed->demux->feed_list);
627 out:
628 spin_unlock_irq(&feed->demux->lock);
629 }
630
631 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
632 {
633 spin_lock_irq(&feed->demux->lock);
634 if (!(dvb_demux_feed_find(feed))) {
635 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
636 __func__, feed->type, feed->state, feed->pid);
637 goto out;
638 }
639
640 list_del(&feed->list_head);
641 out:
642 spin_unlock_irq(&feed->demux->lock);
643 }
644
645 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
646 enum dmx_ts_pes pes_type,
647 size_t circular_buffer_size, struct timespec timeout)
648 {
649 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
650 struct dvb_demux *demux = feed->demux;
651
652 if (pid > DMX_MAX_PID)
653 return -EINVAL;
654
655 if (mutex_lock_interruptible(&demux->mutex))
656 return -ERESTARTSYS;
657
658 if (ts_type & TS_DECODER) {
659 if (pes_type >= DMX_TS_PES_OTHER) {
660 mutex_unlock(&demux->mutex);
661 return -EINVAL;
662 }
663
664 if (demux->pesfilter[pes_type] &&
665 demux->pesfilter[pes_type] != feed) {
666 mutex_unlock(&demux->mutex);
667 return -EINVAL;
668 }
669
670 demux->pesfilter[pes_type] = feed;
671 demux->pids[pes_type] = pid;
672 }
673
674 dvb_demux_feed_add(feed);
675
676 feed->pid = pid;
677 feed->buffer_size = circular_buffer_size;
678 feed->timeout = timeout;
679 feed->ts_type = ts_type;
680 feed->pes_type = pes_type;
681
682 if (feed->buffer_size) {
683 #ifdef NOBUFS
684 feed->buffer = NULL;
685 #else
686 feed->buffer = vmalloc(feed->buffer_size);
687 if (!feed->buffer) {
688 mutex_unlock(&demux->mutex);
689 return -ENOMEM;
690 }
691 #endif
692 }
693
694 feed->state = DMX_STATE_READY;
695 mutex_unlock(&demux->mutex);
696
697 return 0;
698 }
699
700 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
701 {
702 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
703 struct dvb_demux *demux = feed->demux;
704 int ret;
705
706 if (mutex_lock_interruptible(&demux->mutex))
707 return -ERESTARTSYS;
708
709 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
710 mutex_unlock(&demux->mutex);
711 return -EINVAL;
712 }
713
714 if (!demux->start_feed) {
715 mutex_unlock(&demux->mutex);
716 return -ENODEV;
717 }
718
719 if ((ret = demux->start_feed(feed)) < 0) {
720 mutex_unlock(&demux->mutex);
721 return ret;
722 }
723
724 spin_lock_irq(&demux->lock);
725 ts_feed->is_filtering = 1;
726 feed->state = DMX_STATE_GO;
727 spin_unlock_irq(&demux->lock);
728 mutex_unlock(&demux->mutex);
729
730 return 0;
731 }
732
733 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
734 {
735 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
736 struct dvb_demux *demux = feed->demux;
737 int ret;
738
739 mutex_lock(&demux->mutex);
740
741 if (feed->state < DMX_STATE_GO) {
742 mutex_unlock(&demux->mutex);
743 return -EINVAL;
744 }
745
746 if (!demux->stop_feed) {
747 mutex_unlock(&demux->mutex);
748 return -ENODEV;
749 }
750
751 ret = demux->stop_feed(feed);
752
753 spin_lock_irq(&demux->lock);
754 ts_feed->is_filtering = 0;
755 feed->state = DMX_STATE_ALLOCATED;
756 spin_unlock_irq(&demux->lock);
757 mutex_unlock(&demux->mutex);
758
759 return ret;
760 }
761
762 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
763 struct dmx_ts_feed **ts_feed,
764 dmx_ts_cb callback)
765 {
766 struct dvb_demux *demux = (struct dvb_demux *)dmx;
767 struct dvb_demux_feed *feed;
768
769 if (mutex_lock_interruptible(&demux->mutex))
770 return -ERESTARTSYS;
771
772 if (!(feed = dvb_dmx_feed_alloc(demux))) {
773 mutex_unlock(&demux->mutex);
774 return -EBUSY;
775 }
776
777 feed->type = DMX_TYPE_TS;
778 feed->cb.ts = callback;
779 feed->demux = demux;
780 feed->pid = 0xffff;
781 feed->peslen = 0xfffa;
782 feed->buffer = NULL;
783
784 (*ts_feed) = &feed->feed.ts;
785 (*ts_feed)->parent = dmx;
786 (*ts_feed)->priv = NULL;
787 (*ts_feed)->is_filtering = 0;
788 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
789 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
790 (*ts_feed)->set = dmx_ts_feed_set;
791
792 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
793 feed->state = DMX_STATE_FREE;
794 mutex_unlock(&demux->mutex);
795 return -EBUSY;
796 }
797
798 feed->filter->type = DMX_TYPE_TS;
799 feed->filter->feed = feed;
800 feed->filter->state = DMX_STATE_READY;
801
802 mutex_unlock(&demux->mutex);
803
804 return 0;
805 }
806
807 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
808 struct dmx_ts_feed *ts_feed)
809 {
810 struct dvb_demux *demux = (struct dvb_demux *)dmx;
811 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
812
813 mutex_lock(&demux->mutex);
814
815 if (feed->state == DMX_STATE_FREE) {
816 mutex_unlock(&demux->mutex);
817 return -EINVAL;
818 }
819 #ifndef NOBUFS
820 vfree(feed->buffer);
821 feed->buffer = NULL;
822 #endif
823
824 feed->state = DMX_STATE_FREE;
825 feed->filter->state = DMX_STATE_FREE;
826
827 dvb_demux_feed_del(feed);
828
829 feed->pid = 0xffff;
830
831 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_TS_PES_OTHER)
832 demux->pesfilter[feed->pes_type] = NULL;
833
834 mutex_unlock(&demux->mutex);
835 return 0;
836 }
837
838 /******************************************************************************
839 * dmx_section_feed API calls
840 ******************************************************************************/
841
842 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
843 struct dmx_section_filter **filter)
844 {
845 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
846 struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
847 struct dvb_demux_filter *dvbdmxfilter;
848
849 if (mutex_lock_interruptible(&dvbdemux->mutex))
850 return -ERESTARTSYS;
851
852 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
853 if (!dvbdmxfilter) {
854 mutex_unlock(&dvbdemux->mutex);
855 return -EBUSY;
856 }
857
858 spin_lock_irq(&dvbdemux->lock);
859 *filter = &dvbdmxfilter->filter;
860 (*filter)->parent = feed;
861 (*filter)->priv = NULL;
862 dvbdmxfilter->feed = dvbdmxfeed;
863 dvbdmxfilter->type = DMX_TYPE_SEC;
864 dvbdmxfilter->state = DMX_STATE_READY;
865 dvbdmxfilter->next = dvbdmxfeed->filter;
866 dvbdmxfeed->filter = dvbdmxfilter;
867 spin_unlock_irq(&dvbdemux->lock);
868
869 mutex_unlock(&dvbdemux->mutex);
870 return 0;
871 }
872
873 static int dmx_section_feed_set(struct dmx_section_feed *feed,
874 u16 pid, size_t circular_buffer_size,
875 int check_crc)
876 {
877 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
878 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
879
880 if (pid > 0x1fff)
881 return -EINVAL;
882
883 if (mutex_lock_interruptible(&dvbdmx->mutex))
884 return -ERESTARTSYS;
885
886 dvb_demux_feed_add(dvbdmxfeed);
887
888 dvbdmxfeed->pid = pid;
889 dvbdmxfeed->buffer_size = circular_buffer_size;
890 dvbdmxfeed->feed.sec.check_crc = check_crc;
891
892 #ifdef NOBUFS
893 dvbdmxfeed->buffer = NULL;
894 #else
895 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
896 if (!dvbdmxfeed->buffer) {
897 mutex_unlock(&dvbdmx->mutex);
898 return -ENOMEM;
899 }
900 #endif
901
902 dvbdmxfeed->state = DMX_STATE_READY;
903 mutex_unlock(&dvbdmx->mutex);
904 return 0;
905 }
906
907 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
908 {
909 int i;
910 struct dvb_demux_filter *f;
911 struct dmx_section_filter *sf;
912 u8 mask, mode, doneq;
913
914 if (!(f = dvbdmxfeed->filter))
915 return;
916 do {
917 sf = &f->filter;
918 doneq = 0;
919 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
920 mode = sf->filter_mode[i];
921 mask = sf->filter_mask[i];
922 f->maskandmode[i] = mask & mode;
923 doneq |= f->maskandnotmode[i] = mask & ~mode;
924 }
925 f->doneq = doneq ? 1 : 0;
926 } while ((f = f->next));
927 }
928
929 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
930 {
931 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
932 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
933 int ret;
934
935 if (mutex_lock_interruptible(&dvbdmx->mutex))
936 return -ERESTARTSYS;
937
938 if (feed->is_filtering) {
939 mutex_unlock(&dvbdmx->mutex);
940 return -EBUSY;
941 }
942
943 if (!dvbdmxfeed->filter) {
944 mutex_unlock(&dvbdmx->mutex);
945 return -EINVAL;
946 }
947
948 dvbdmxfeed->feed.sec.tsfeedp = 0;
949 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
950 dvbdmxfeed->feed.sec.secbufp = 0;
951 dvbdmxfeed->feed.sec.seclen = 0;
952
953 if (!dvbdmx->start_feed) {
954 mutex_unlock(&dvbdmx->mutex);
955 return -ENODEV;
956 }
957
958 prepare_secfilters(dvbdmxfeed);
959
960 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
961 mutex_unlock(&dvbdmx->mutex);
962 return ret;
963 }
964
965 spin_lock_irq(&dvbdmx->lock);
966 feed->is_filtering = 1;
967 dvbdmxfeed->state = DMX_STATE_GO;
968 spin_unlock_irq(&dvbdmx->lock);
969
970 mutex_unlock(&dvbdmx->mutex);
971 return 0;
972 }
973
974 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
975 {
976 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
977 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
978 int ret;
979
980 mutex_lock(&dvbdmx->mutex);
981
982 if (!dvbdmx->stop_feed) {
983 mutex_unlock(&dvbdmx->mutex);
984 return -ENODEV;
985 }
986
987 ret = dvbdmx->stop_feed(dvbdmxfeed);
988
989 spin_lock_irq(&dvbdmx->lock);
990 dvbdmxfeed->state = DMX_STATE_READY;
991 feed->is_filtering = 0;
992 spin_unlock_irq(&dvbdmx->lock);
993
994 mutex_unlock(&dvbdmx->mutex);
995 return ret;
996 }
997
998 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
999 struct dmx_section_filter *filter)
1000 {
1001 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
1002 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1003 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1004
1005 mutex_lock(&dvbdmx->mutex);
1006
1007 if (dvbdmxfilter->feed != dvbdmxfeed) {
1008 mutex_unlock(&dvbdmx->mutex);
1009 return -EINVAL;
1010 }
1011
1012 if (feed->is_filtering)
1013 feed->stop_filtering(feed);
1014
1015 spin_lock_irq(&dvbdmx->lock);
1016 f = dvbdmxfeed->filter;
1017
1018 if (f == dvbdmxfilter) {
1019 dvbdmxfeed->filter = dvbdmxfilter->next;
1020 } else {
1021 while (f->next != dvbdmxfilter)
1022 f = f->next;
1023 f->next = f->next->next;
1024 }
1025
1026 dvbdmxfilter->state = DMX_STATE_FREE;
1027 spin_unlock_irq(&dvbdmx->lock);
1028 mutex_unlock(&dvbdmx->mutex);
1029 return 0;
1030 }
1031
1032 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1033 struct dmx_section_feed **feed,
1034 dmx_section_cb callback)
1035 {
1036 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1037 struct dvb_demux_feed *dvbdmxfeed;
1038
1039 if (mutex_lock_interruptible(&dvbdmx->mutex))
1040 return -ERESTARTSYS;
1041
1042 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1043 mutex_unlock(&dvbdmx->mutex);
1044 return -EBUSY;
1045 }
1046
1047 dvbdmxfeed->type = DMX_TYPE_SEC;
1048 dvbdmxfeed->cb.sec = callback;
1049 dvbdmxfeed->demux = dvbdmx;
1050 dvbdmxfeed->pid = 0xffff;
1051 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1052 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1053 dvbdmxfeed->feed.sec.tsfeedp = 0;
1054 dvbdmxfeed->filter = NULL;
1055 dvbdmxfeed->buffer = NULL;
1056
1057 (*feed) = &dvbdmxfeed->feed.sec;
1058 (*feed)->is_filtering = 0;
1059 (*feed)->parent = demux;
1060 (*feed)->priv = NULL;
1061
1062 (*feed)->set = dmx_section_feed_set;
1063 (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1064 (*feed)->start_filtering = dmx_section_feed_start_filtering;
1065 (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1066 (*feed)->release_filter = dmx_section_feed_release_filter;
1067
1068 mutex_unlock(&dvbdmx->mutex);
1069 return 0;
1070 }
1071
1072 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1073 struct dmx_section_feed *feed)
1074 {
1075 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1076 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1077
1078 mutex_lock(&dvbdmx->mutex);
1079
1080 if (dvbdmxfeed->state == DMX_STATE_FREE) {
1081 mutex_unlock(&dvbdmx->mutex);
1082 return -EINVAL;
1083 }
1084 #ifndef NOBUFS
1085 vfree(dvbdmxfeed->buffer);
1086 dvbdmxfeed->buffer = NULL;
1087 #endif
1088 dvbdmxfeed->state = DMX_STATE_FREE;
1089
1090 dvb_demux_feed_del(dvbdmxfeed);
1091
1092 dvbdmxfeed->pid = 0xffff;
1093
1094 mutex_unlock(&dvbdmx->mutex);
1095 return 0;
1096 }
1097
1098 /******************************************************************************
1099 * dvb_demux kernel data API calls
1100 ******************************************************************************/
1101
1102 static int dvbdmx_open(struct dmx_demux *demux)
1103 {
1104 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1105
1106 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1107 return -EUSERS;
1108
1109 dvbdemux->users++;
1110 return 0;
1111 }
1112
1113 static int dvbdmx_close(struct dmx_demux *demux)
1114 {
1115 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1116
1117 if (dvbdemux->users == 0)
1118 return -ENODEV;
1119
1120 dvbdemux->users--;
1121 //FIXME: release any unneeded resources if users==0
1122 return 0;
1123 }
1124
1125 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1126 {
1127 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1128 void *p;
1129
1130 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1131 return -EINVAL;
1132
1133 p = memdup_user(buf, count);
1134 if (IS_ERR(p))
1135 return PTR_ERR(p);
1136 if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1137 kfree(p);
1138 return -ERESTARTSYS;
1139 }
1140 dvb_dmx_swfilter(dvbdemux, p, count);
1141 kfree(p);
1142 mutex_unlock(&dvbdemux->mutex);
1143
1144 if (signal_pending(current))
1145 return -EINTR;
1146 return count;
1147 }
1148
1149 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1150 struct dmx_frontend *frontend)
1151 {
1152 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1153 struct list_head *head = &dvbdemux->frontend_list;
1154
1155 list_add(&(frontend->connectivity_list), head);
1156
1157 return 0;
1158 }
1159
1160 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1161 struct dmx_frontend *frontend)
1162 {
1163 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1164 struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1165
1166 list_for_each_safe(pos, n, head) {
1167 if (DMX_FE_ENTRY(pos) == frontend) {
1168 list_del(pos);
1169 return 0;
1170 }
1171 }
1172
1173 return -ENODEV;
1174 }
1175
1176 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1177 {
1178 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1179
1180 if (list_empty(&dvbdemux->frontend_list))
1181 return NULL;
1182
1183 return &dvbdemux->frontend_list;
1184 }
1185
1186 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1187 struct dmx_frontend *frontend)
1188 {
1189 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1190
1191 if (demux->frontend)
1192 return -EINVAL;
1193
1194 mutex_lock(&dvbdemux->mutex);
1195
1196 demux->frontend = frontend;
1197 mutex_unlock(&dvbdemux->mutex);
1198 return 0;
1199 }
1200
1201 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1202 {
1203 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1204
1205 mutex_lock(&dvbdemux->mutex);
1206
1207 demux->frontend = NULL;
1208 mutex_unlock(&dvbdemux->mutex);
1209 return 0;
1210 }
1211
1212 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1213 {
1214 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1215
1216 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1217 return 0;
1218 }
1219
1220 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1221 {
1222 int i;
1223 struct dmx_demux *dmx = &dvbdemux->dmx;
1224
1225 dvbdemux->cnt_storage = NULL;
1226 dvbdemux->users = 0;
1227 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1228
1229 if (!dvbdemux->filter)
1230 return -ENOMEM;
1231
1232 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1233 if (!dvbdemux->feed) {
1234 vfree(dvbdemux->filter);
1235 dvbdemux->filter = NULL;
1236 return -ENOMEM;
1237 }
1238 for (i = 0; i < dvbdemux->filternum; i++) {
1239 dvbdemux->filter[i].state = DMX_STATE_FREE;
1240 dvbdemux->filter[i].index = i;
1241 }
1242 for (i = 0; i < dvbdemux->feednum; i++) {
1243 dvbdemux->feed[i].state = DMX_STATE_FREE;
1244 dvbdemux->feed[i].index = i;
1245 }
1246
1247 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1248 if (!dvbdemux->cnt_storage)
1249 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
1250
1251 INIT_LIST_HEAD(&dvbdemux->frontend_list);
1252
1253 for (i = 0; i < DMX_TS_PES_OTHER; i++) {
1254 dvbdemux->pesfilter[i] = NULL;
1255 dvbdemux->pids[i] = 0xffff;
1256 }
1257
1258 INIT_LIST_HEAD(&dvbdemux->feed_list);
1259
1260 dvbdemux->playing = 0;
1261 dvbdemux->recording = 0;
1262 dvbdemux->tsbufp = 0;
1263
1264 if (!dvbdemux->check_crc32)
1265 dvbdemux->check_crc32 = dvb_dmx_crc32;
1266
1267 if (!dvbdemux->memcopy)
1268 dvbdemux->memcopy = dvb_dmx_memcopy;
1269
1270 dmx->frontend = NULL;
1271 dmx->priv = dvbdemux;
1272 dmx->open = dvbdmx_open;
1273 dmx->close = dvbdmx_close;
1274 dmx->write = dvbdmx_write;
1275 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1276 dmx->release_ts_feed = dvbdmx_release_ts_feed;
1277 dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1278 dmx->release_section_feed = dvbdmx_release_section_feed;
1279
1280 dmx->add_frontend = dvbdmx_add_frontend;
1281 dmx->remove_frontend = dvbdmx_remove_frontend;
1282 dmx->get_frontends = dvbdmx_get_frontends;
1283 dmx->connect_frontend = dvbdmx_connect_frontend;
1284 dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1285 dmx->get_pes_pids = dvbdmx_get_pes_pids;
1286
1287 mutex_init(&dvbdemux->mutex);
1288 spin_lock_init(&dvbdemux->lock);
1289
1290 return 0;
1291 }
1292
1293 EXPORT_SYMBOL(dvb_dmx_init);
1294
1295 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1296 {
1297 vfree(dvbdemux->cnt_storage);
1298 vfree(dvbdemux->filter);
1299 vfree(dvbdemux->feed);
1300 }
1301
1302 EXPORT_SYMBOL(dvb_dmx_release);
CRIS linux kernel tree