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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / media / dvb-core / dvb_demux.c
blob3485655fa08297c1ea6d75e73e40c3b1797e676d
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 static int dvb_demux_feed_err_pkts = 1;
54 module_param(dvb_demux_feed_err_pkts, int, 0644);
55 MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
56 "when set to 0, drop packets with the TEI bit set (1 by default)");
57
58 #define dprintk_tscheck(x...) do { \
59 if (dvb_demux_tscheck && printk_ratelimit()) \
60 printk(x); \
61 } while (0)
62
63 /******************************************************************************
64 * static inlined helper functions
65 ******************************************************************************/
66
67 static inline u16 section_length(const u8 *buf)
68 {
69 return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
70 }
71
72 static inline u16 ts_pid(const u8 *buf)
73 {
74 return ((buf[1] & 0x1f) << 8) + buf[2];
75 }
76
77 static inline u8 payload(const u8 *tsp)
78 {
79 if (!(tsp[3] & 0x10)) // no payload?
80 return 0;
81
82 if (tsp[3] & 0x20) { // adaptation field?
83 if (tsp[4] > 183) // corrupted data?
84 return 0;
85 else
86 return 184 - 1 - tsp[4];
87 }
88
89 return 184;
90 }
91
92 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
93 {
94 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
95 }
96
97 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
98 size_t len)
99 {
100 memcpy(d, s, len);
101 }
102
103 /******************************************************************************
104 * Software filter functions
105 ******************************************************************************/
106
107 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
108 const u8 *buf)
109 {
110 int count = payload(buf);
111 int p;
112 //int ccok;
113 //u8 cc;
114
115 if (count == 0)
116 return -1;
117
118 p = 188 - count;
119
120 /*
121 cc = buf[3] & 0x0f;
122 ccok = ((feed->cc + 1) & 0x0f) == cc;
123 feed->cc = cc;
124 if (!ccok)
125 printk("missed packet!\n");
126 */
127
128 if (buf[1] & 0x40) // PUSI ?
129 feed->peslen = 0xfffa;
130
131 feed->peslen += count;
132
133 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
134 }
135
136 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
137 struct dvb_demux_filter *f)
138 {
139 u8 neq = 0;
140 int i;
141
142 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
143 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
144
145 if (f->maskandmode[i] & xor)
146 return 0;
147
148 neq |= f->maskandnotmode[i] & xor;
149 }
150
151 if (f->doneq && !neq)
152 return 0;
153
154 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
155 NULL, 0, &f->filter, DMX_OK);
156 }
157
158 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
159 {
160 struct dvb_demux *demux = feed->demux;
161 struct dvb_demux_filter *f = feed->filter;
162 struct dmx_section_feed *sec = &feed->feed.sec;
163 int section_syntax_indicator;
164
165 if (!sec->is_filtering)
166 return 0;
167
168 if (!f)
169 return 0;
170
171 if (sec->check_crc) {
172 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
173 if (section_syntax_indicator &&
174 demux->check_crc32(feed, sec->secbuf, sec->seclen))
175 return -1;
176 }
177
178 do {
179 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
180 return -1;
181 } while ((f = f->next) && sec->is_filtering);
182
183 sec->seclen = 0;
184
185 return 0;
186 }
187
188 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
189 {
190 struct dmx_section_feed *sec = &feed->feed.sec;
191
192 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
193 if (sec->secbufp < sec->tsfeedp) {
194 int i, n = sec->tsfeedp - sec->secbufp;
195
196 /*
197 * Section padding is done with 0xff bytes entirely.
198 * Due to speed reasons, we won't check all of them
199 * but just first and last.
200 */
201 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
202 printk("dvb_demux.c section ts padding loss: %d/%d\n",
203 n, sec->tsfeedp);
204 printk("dvb_demux.c pad data:");
205 for (i = 0; i < n; i++)
206 printk(" %02x", sec->secbuf[i]);
207 printk("\n");
208 }
209 }
210 #endif
211
212 sec->tsfeedp = sec->secbufp = sec->seclen = 0;
213 sec->secbuf = sec->secbuf_base;
214 }
215
216 /*
217 * Losless Section Demux 1.4.1 by Emard
218 * Valsecchi Patrick:
219 * - middle of section A (no PUSI)
220 * - end of section A and start of section B
221 * (with PUSI pointing to the start of the second section)
222 *
223 * In this case, without feed->pusi_seen you'll receive a garbage section
224 * consisting of the end of section A. Basically because tsfeedp
225 * is incemented and the use=0 condition is not raised
226 * when the second packet arrives.
227 *
228 * Fix:
229 * when demux is started, let feed->pusi_seen = 0 to
230 * prevent initial feeding of garbage from the end of
231 * previous section. When you for the first time see PUSI=1
232 * then set feed->pusi_seen = 1
233 */
234 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
235 const u8 *buf, u8 len)
236 {
237 struct dvb_demux *demux = feed->demux;
238 struct dmx_section_feed *sec = &feed->feed.sec;
239 u16 limit, seclen, n;
240
241 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
242 return 0;
243
244 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
245 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
246 printk("dvb_demux.c section buffer full loss: %d/%d\n",
247 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
248 DMX_MAX_SECFEED_SIZE);
249 #endif
250 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
251 }
252
253 if (len <= 0)
254 return 0;
255
256 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
257 sec->tsfeedp += len;
258
259 /*
260 * Dump all the sections we can find in the data (Emard)
261 */
262 limit = sec->tsfeedp;
263 if (limit > DMX_MAX_SECFEED_SIZE)
264 return -1; /* internal error should never happen */
265
266 /* to be sure always set secbuf */
267 sec->secbuf = sec->secbuf_base + sec->secbufp;
268
269 for (n = 0; sec->secbufp + 2 < limit; n++) {
270 seclen = section_length(sec->secbuf);
271 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
272 || seclen + sec->secbufp > limit)
273 return 0;
274 sec->seclen = seclen;
275 sec->crc_val = ~0;
276 /* dump [secbuf .. secbuf+seclen) */
277 if (feed->pusi_seen)
278 dvb_dmx_swfilter_section_feed(feed);
279 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
280 else
281 printk("dvb_demux.c pusi not seen, discarding section data\n");
282 #endif
283 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
284 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */
285 }
286
287 return 0;
288 }
289
290 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
291 const u8 *buf)
292 {
293 u8 p, count;
294 int ccok, dc_i = 0;
295 u8 cc;
296
297 count = payload(buf);
298
299 if (count == 0) /* count == 0 if no payload or out of range */
300 return -1;
301
302 p = 188 - count; /* payload start */
303
304 cc = buf[3] & 0x0f;
305 ccok = ((feed->cc + 1) & 0x0f) == cc;
306 feed->cc = cc;
307
308 if (buf[3] & 0x20) {
309 /* adaption field present, check for discontinuity_indicator */
310 if ((buf[4] > 0) && (buf[5] & 0x80))
311 dc_i = 1;
312 }
313
314 if (!ccok || dc_i) {
315 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
316 printk("dvb_demux.c discontinuity detected %d bytes lost\n",
317 count);
318 /*
319 * those bytes under sume circumstances will again be reported
320 * in the following dvb_dmx_swfilter_section_new
321 */
322 #endif
323 /*
324 * Discontinuity detected. Reset pusi_seen = 0 to
325 * stop feeding of suspicious data until next PUSI=1 arrives
326 */
327 feed->pusi_seen = 0;
328 dvb_dmx_swfilter_section_new(feed);
329 }
330
331 if (buf[1] & 0x40) {
332 /* PUSI=1 (is set), section boundary is here */
333 if (count > 1 && buf[p] < count) {
334 const u8 *before = &buf[p + 1];
335 u8 before_len = buf[p];
336 const u8 *after = &before[before_len];
337 u8 after_len = count - 1 - before_len;
338
339 dvb_dmx_swfilter_section_copy_dump(feed, before,
340 before_len);
341 /* before start of new section, set pusi_seen = 1 */
342 feed->pusi_seen = 1;
343 dvb_dmx_swfilter_section_new(feed);
344 dvb_dmx_swfilter_section_copy_dump(feed, after,
345 after_len);
346 }
347 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
348 else if (count > 0)
349 printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
350 #endif
351 } else {
352 /* PUSI=0 (is not set), no section boundary */
353 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
354 }
355
356 return 0;
357 }
358
359 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
360 const u8 *buf)
361 {
362 switch (feed->type) {
363 case DMX_TYPE_TS:
364 if (!feed->feed.ts.is_filtering)
365 break;
366 if (feed->ts_type & TS_PACKET) {
367 if (feed->ts_type & TS_PAYLOAD_ONLY)
368 dvb_dmx_swfilter_payload(feed, buf);
369 else
370 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
371 DMX_OK);
372 }
373 if (feed->ts_type & TS_DECODER)
374 if (feed->demux->write_to_decoder)
375 feed->demux->write_to_decoder(feed, buf, 188);
376 break;
377
378 case DMX_TYPE_SEC:
379 if (!feed->feed.sec.is_filtering)
380 break;
381 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
382 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
383 break;
384
385 default:
386 break;
387 }
388 }
389
390 #define DVR_FEED(f) \
391 (((f)->type == DMX_TYPE_TS) && \
392 ((f)->feed.ts.is_filtering) && \
393 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
394
395 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
396 {
397 struct dvb_demux_feed *feed;
398 u16 pid = ts_pid(buf);
399 int dvr_done = 0;
400
401 if (dvb_demux_speedcheck) {
402 struct timespec cur_time, delta_time;
403 u64 speed_bytes, speed_timedelta;
404
405 demux->speed_pkts_cnt++;
406
407 /* show speed every SPEED_PKTS_INTERVAL packets */
408 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
409 cur_time = current_kernel_time();
410
411 if (demux->speed_last_time.tv_sec != 0 &&
412 demux->speed_last_time.tv_nsec != 0) {
413 delta_time = timespec_sub(cur_time,
414 demux->speed_last_time);
415 speed_bytes = (u64)demux->speed_pkts_cnt
416 * 188 * 8;
417 /* convert to 1024 basis */
418 speed_bytes = 1000 * div64_u64(speed_bytes,
419 1024);
420 speed_timedelta =
421 (u64)timespec_to_ns(&delta_time);
422 speed_timedelta = div64_u64(speed_timedelta,
423 1000000); /* nsec -> usec */
424 printk(KERN_INFO "TS speed %llu Kbits/sec \n",
425 div64_u64(speed_bytes,
426 speed_timedelta));
427 }
428
429 demux->speed_last_time = cur_time;
430 demux->speed_pkts_cnt = 0;
431 }
432 }
433
434 if (buf[1] & 0x80) {
435 dprintk_tscheck("TEI detected. "
436 "PID=0x%x data1=0x%x\n",
437 pid, buf[1]);
438 /* data in this packet cant be trusted - drop it unless
439 * module option dvb_demux_feed_err_pkts is set */
440 if (!dvb_demux_feed_err_pkts)
441 return;
442 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
443 if (demux->cnt_storage && dvb_demux_tscheck) {
444 /* check pkt counter */
445 if (pid < MAX_PID) {
446 if (buf[3] & 0x10)
447 demux->cnt_storage[pid] =
448 (demux->cnt_storage[pid] + 1) & 0xf;
449
450 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
451 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
452 pid, demux->cnt_storage[pid],
453 buf[3] & 0xf);
454 demux->cnt_storage[pid] = buf[3] & 0xf;
455 }
456 }
457 /* end check */
458 }
459
460 list_for_each_entry(feed, &demux->feed_list, list_head) {
461 if ((feed->pid != pid) && (feed->pid != 0x2000))
462 continue;
463
464 /* copy each packet only once to the dvr device, even
465 * if a PID is in multiple filters (e.g. video + PCR) */
466 if ((DVR_FEED(feed)) && (dvr_done++))
467 continue;
468
469 if (feed->pid == pid)
470 dvb_dmx_swfilter_packet_type(feed, buf);
471 else if (feed->pid == 0x2000)
472 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
473 }
474 }
475
476 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
477 size_t count)
478 {
479 spin_lock(&demux->lock);
480
481 while (count--) {
482 if (buf[0] == 0x47)
483 dvb_dmx_swfilter_packet(demux, buf);
484 buf += 188;
485 }
486
487 spin_unlock(&demux->lock);
488 }
489
490 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
491
492 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
493 const int pktsize)
494 {
495 int start = pos, lost;
496
497 while (pos < count) {
498 if (buf[pos] == 0x47 ||
499 (pktsize == 204 && buf[pos] == 0xB8))
500 break;
501 pos++;
502 }
503
504 lost = pos - start;
505 if (lost) {
506 /* This garbage is part of a valid packet? */
507 int backtrack = pos - pktsize;
508 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
509 (pktsize == 204 && buf[backtrack] == 0xB8)))
510 return backtrack;
511 }
512
513 return pos;
514 }
515
516 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
517 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
518 size_t count, const int pktsize)
519 {
520 int p = 0, i, j;
521 const u8 *q;
522
523 spin_lock(&demux->lock);
524
525 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
526 i = demux->tsbufp;
527 j = pktsize - i;
528 if (count < j) {
529 memcpy(&demux->tsbuf[i], buf, count);
530 demux->tsbufp += count;
531 goto bailout;
532 }
533 memcpy(&demux->tsbuf[i], buf, j);
534 if (demux->tsbuf[0] == 0x47) /* double check */
535 dvb_dmx_swfilter_packet(demux, demux->tsbuf);
536 demux->tsbufp = 0;
537 p += j;
538 }
539
540 while (1) {
541 p = find_next_packet(buf, p, count, pktsize);
542 if (p >= count)
543 break;
544 if (count - p < pktsize)
545 break;
546
547 q = &buf[p];
548
549 if (pktsize == 204 && (*q == 0xB8)) {
550 memcpy(demux->tsbuf, q, 188);
551 demux->tsbuf[0] = 0x47;
552 q = demux->tsbuf;
553 }
554 dvb_dmx_swfilter_packet(demux, q);
555 p += pktsize;
556 }
557
558 i = count - p;
559 if (i) {
560 memcpy(demux->tsbuf, &buf[p], i);
561 demux->tsbufp = i;
562 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
563 demux->tsbuf[0] = 0x47;
564 }
565
566 bailout:
567 spin_unlock(&demux->lock);
568 }
569
570 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
571 {
572 _dvb_dmx_swfilter(demux, buf, count, 188);
573 }
574 EXPORT_SYMBOL(dvb_dmx_swfilter);
575
576 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
577 {
578 _dvb_dmx_swfilter(demux, buf, count, 204);
579 }
580 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
581
582 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
583 {
584 spin_lock(&demux->lock);
585
586 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, DMX_OK);
587
588 spin_unlock(&demux->lock);
589 }
590 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
591
592 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
593 {
594 int i;
595
596 for (i = 0; i < demux->filternum; i++)
597 if (demux->filter[i].state == DMX_STATE_FREE)
598 break;
599
600 if (i == demux->filternum)
601 return NULL;
602
603 demux->filter[i].state = DMX_STATE_ALLOCATED;
604
605 return &demux->filter[i];
606 }
607
608 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
609 {
610 int i;
611
612 for (i = 0; i < demux->feednum; i++)
613 if (demux->feed[i].state == DMX_STATE_FREE)
614 break;
615
616 if (i == demux->feednum)
617 return NULL;
618
619 demux->feed[i].state = DMX_STATE_ALLOCATED;
620
621 return &demux->feed[i];
622 }
623
624 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
625 {
626 struct dvb_demux_feed *entry;
627
628 list_for_each_entry(entry, &feed->demux->feed_list, list_head)
629 if (entry == feed)
630 return 1;
631
632 return 0;
633 }
634
635 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
636 {
637 spin_lock_irq(&feed->demux->lock);
638 if (dvb_demux_feed_find(feed)) {
639 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
640 __func__, feed->type, feed->state, feed->pid);
641 goto out;
642 }
643
644 list_add(&feed->list_head, &feed->demux->feed_list);
645 out:
646 spin_unlock_irq(&feed->demux->lock);
647 }
648
649 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
650 {
651 spin_lock_irq(&feed->demux->lock);
652 if (!(dvb_demux_feed_find(feed))) {
653 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
654 __func__, feed->type, feed->state, feed->pid);
655 goto out;
656 }
657
658 list_del(&feed->list_head);
659 out:
660 spin_unlock_irq(&feed->demux->lock);
661 }
662
663 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
664 enum dmx_ts_pes pes_type,
665 size_t circular_buffer_size, struct timespec timeout)
666 {
667 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
668 struct dvb_demux *demux = feed->demux;
669
670 if (pid > DMX_MAX_PID)
671 return -EINVAL;
672
673 if (mutex_lock_interruptible(&demux->mutex))
674 return -ERESTARTSYS;
675
676 if (ts_type & TS_DECODER) {
677 if (pes_type >= DMX_PES_OTHER) {
678 mutex_unlock(&demux->mutex);
679 return -EINVAL;
680 }
681
682 if (demux->pesfilter[pes_type] &&
683 demux->pesfilter[pes_type] != feed) {
684 mutex_unlock(&demux->mutex);
685 return -EINVAL;
686 }
687
688 demux->pesfilter[pes_type] = feed;
689 demux->pids[pes_type] = pid;
690 }
691
692 dvb_demux_feed_add(feed);
693
694 feed->pid = pid;
695 feed->buffer_size = circular_buffer_size;
696 feed->timeout = timeout;
697 feed->ts_type = ts_type;
698 feed->pes_type = pes_type;
699
700 if (feed->buffer_size) {
701 #ifdef NOBUFS
702 feed->buffer = NULL;
703 #else
704 feed->buffer = vmalloc(feed->buffer_size);
705 if (!feed->buffer) {
706 mutex_unlock(&demux->mutex);
707 return -ENOMEM;
708 }
709 #endif
710 }
711
712 feed->state = DMX_STATE_READY;
713 mutex_unlock(&demux->mutex);
714
715 return 0;
716 }
717
718 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
719 {
720 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
721 struct dvb_demux *demux = feed->demux;
722 int ret;
723
724 if (mutex_lock_interruptible(&demux->mutex))
725 return -ERESTARTSYS;
726
727 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
728 mutex_unlock(&demux->mutex);
729 return -EINVAL;
730 }
731
732 if (!demux->start_feed) {
733 mutex_unlock(&demux->mutex);
734 return -ENODEV;
735 }
736
737 if ((ret = demux->start_feed(feed)) < 0) {
738 mutex_unlock(&demux->mutex);
739 return ret;
740 }
741
742 spin_lock_irq(&demux->lock);
743 ts_feed->is_filtering = 1;
744 feed->state = DMX_STATE_GO;
745 spin_unlock_irq(&demux->lock);
746 mutex_unlock(&demux->mutex);
747
748 return 0;
749 }
750
751 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
752 {
753 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
754 struct dvb_demux *demux = feed->demux;
755 int ret;
756
757 mutex_lock(&demux->mutex);
758
759 if (feed->state < DMX_STATE_GO) {
760 mutex_unlock(&demux->mutex);
761 return -EINVAL;
762 }
763
764 if (!demux->stop_feed) {
765 mutex_unlock(&demux->mutex);
766 return -ENODEV;
767 }
768
769 ret = demux->stop_feed(feed);
770
771 spin_lock_irq(&demux->lock);
772 ts_feed->is_filtering = 0;
773 feed->state = DMX_STATE_ALLOCATED;
774 spin_unlock_irq(&demux->lock);
775 mutex_unlock(&demux->mutex);
776
777 return ret;
778 }
779
780 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
781 struct dmx_ts_feed **ts_feed,
782 dmx_ts_cb callback)
783 {
784 struct dvb_demux *demux = (struct dvb_demux *)dmx;
785 struct dvb_demux_feed *feed;
786
787 if (mutex_lock_interruptible(&demux->mutex))
788 return -ERESTARTSYS;
789
790 if (!(feed = dvb_dmx_feed_alloc(demux))) {
791 mutex_unlock(&demux->mutex);
792 return -EBUSY;
793 }
794
795 feed->type = DMX_TYPE_TS;
796 feed->cb.ts = callback;
797 feed->demux = demux;
798 feed->pid = 0xffff;
799 feed->peslen = 0xfffa;
800 feed->buffer = NULL;
801
802 (*ts_feed) = &feed->feed.ts;
803 (*ts_feed)->parent = dmx;
804 (*ts_feed)->priv = NULL;
805 (*ts_feed)->is_filtering = 0;
806 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
807 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
808 (*ts_feed)->set = dmx_ts_feed_set;
809
810 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
811 feed->state = DMX_STATE_FREE;
812 mutex_unlock(&demux->mutex);
813 return -EBUSY;
814 }
815
816 feed->filter->type = DMX_TYPE_TS;
817 feed->filter->feed = feed;
818 feed->filter->state = DMX_STATE_READY;
819
820 mutex_unlock(&demux->mutex);
821
822 return 0;
823 }
824
825 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
826 struct dmx_ts_feed *ts_feed)
827 {
828 struct dvb_demux *demux = (struct dvb_demux *)dmx;
829 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
830
831 mutex_lock(&demux->mutex);
832
833 if (feed->state == DMX_STATE_FREE) {
834 mutex_unlock(&demux->mutex);
835 return -EINVAL;
836 }
837 #ifndef NOBUFS
838 vfree(feed->buffer);
839 feed->buffer = NULL;
840 #endif
841
842 feed->state = DMX_STATE_FREE;
843 feed->filter->state = DMX_STATE_FREE;
844
845 dvb_demux_feed_del(feed);
846
847 feed->pid = 0xffff;
848
849 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
850 demux->pesfilter[feed->pes_type] = NULL;
851
852 mutex_unlock(&demux->mutex);
853 return 0;
854 }
855
856 /******************************************************************************
857 * dmx_section_feed API calls
858 ******************************************************************************/
859
860 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
861 struct dmx_section_filter **filter)
862 {
863 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
864 struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
865 struct dvb_demux_filter *dvbdmxfilter;
866
867 if (mutex_lock_interruptible(&dvbdemux->mutex))
868 return -ERESTARTSYS;
869
870 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
871 if (!dvbdmxfilter) {
872 mutex_unlock(&dvbdemux->mutex);
873 return -EBUSY;
874 }
875
876 spin_lock_irq(&dvbdemux->lock);
877 *filter = &dvbdmxfilter->filter;
878 (*filter)->parent = feed;
879 (*filter)->priv = NULL;
880 dvbdmxfilter->feed = dvbdmxfeed;
881 dvbdmxfilter->type = DMX_TYPE_SEC;
882 dvbdmxfilter->state = DMX_STATE_READY;
883 dvbdmxfilter->next = dvbdmxfeed->filter;
884 dvbdmxfeed->filter = dvbdmxfilter;
885 spin_unlock_irq(&dvbdemux->lock);
886
887 mutex_unlock(&dvbdemux->mutex);
888 return 0;
889 }
890
891 static int dmx_section_feed_set(struct dmx_section_feed *feed,
892 u16 pid, size_t circular_buffer_size,
893 int check_crc)
894 {
895 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
896 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
897
898 if (pid > 0x1fff)
899 return -EINVAL;
900
901 if (mutex_lock_interruptible(&dvbdmx->mutex))
902 return -ERESTARTSYS;
903
904 dvb_demux_feed_add(dvbdmxfeed);
905
906 dvbdmxfeed->pid = pid;
907 dvbdmxfeed->buffer_size = circular_buffer_size;
908 dvbdmxfeed->feed.sec.check_crc = check_crc;
909
910 #ifdef NOBUFS
911 dvbdmxfeed->buffer = NULL;
912 #else
913 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
914 if (!dvbdmxfeed->buffer) {
915 mutex_unlock(&dvbdmx->mutex);
916 return -ENOMEM;
917 }
918 #endif
919
920 dvbdmxfeed->state = DMX_STATE_READY;
921 mutex_unlock(&dvbdmx->mutex);
922 return 0;
923 }
924
925 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
926 {
927 int i;
928 struct dvb_demux_filter *f;
929 struct dmx_section_filter *sf;
930 u8 mask, mode, doneq;
931
932 if (!(f = dvbdmxfeed->filter))
933 return;
934 do {
935 sf = &f->filter;
936 doneq = 0;
937 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
938 mode = sf->filter_mode[i];
939 mask = sf->filter_mask[i];
940 f->maskandmode[i] = mask & mode;
941 doneq |= f->maskandnotmode[i] = mask & ~mode;
942 }
943 f->doneq = doneq ? 1 : 0;
944 } while ((f = f->next));
945 }
946
947 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
948 {
949 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
950 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
951 int ret;
952
953 if (mutex_lock_interruptible(&dvbdmx->mutex))
954 return -ERESTARTSYS;
955
956 if (feed->is_filtering) {
957 mutex_unlock(&dvbdmx->mutex);
958 return -EBUSY;
959 }
960
961 if (!dvbdmxfeed->filter) {
962 mutex_unlock(&dvbdmx->mutex);
963 return -EINVAL;
964 }
965
966 dvbdmxfeed->feed.sec.tsfeedp = 0;
967 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
968 dvbdmxfeed->feed.sec.secbufp = 0;
969 dvbdmxfeed->feed.sec.seclen = 0;
970
971 if (!dvbdmx->start_feed) {
972 mutex_unlock(&dvbdmx->mutex);
973 return -ENODEV;
974 }
975
976 prepare_secfilters(dvbdmxfeed);
977
978 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
979 mutex_unlock(&dvbdmx->mutex);
980 return ret;
981 }
982
983 spin_lock_irq(&dvbdmx->lock);
984 feed->is_filtering = 1;
985 dvbdmxfeed->state = DMX_STATE_GO;
986 spin_unlock_irq(&dvbdmx->lock);
987
988 mutex_unlock(&dvbdmx->mutex);
989 return 0;
990 }
991
992 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
993 {
994 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
995 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
996 int ret;
997
998 mutex_lock(&dvbdmx->mutex);
999
1000 if (!dvbdmx->stop_feed) {
1001 mutex_unlock(&dvbdmx->mutex);
1002 return -ENODEV;
1003 }
1004
1005 ret = dvbdmx->stop_feed(dvbdmxfeed);
1006
1007 spin_lock_irq(&dvbdmx->lock);
1008 dvbdmxfeed->state = DMX_STATE_READY;
1009 feed->is_filtering = 0;
1010 spin_unlock_irq(&dvbdmx->lock);
1011
1012 mutex_unlock(&dvbdmx->mutex);
1013 return ret;
1014 }
1015
1016 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
1017 struct dmx_section_filter *filter)
1018 {
1019 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
1020 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1021 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1022
1023 mutex_lock(&dvbdmx->mutex);
1024
1025 if (dvbdmxfilter->feed != dvbdmxfeed) {
1026 mutex_unlock(&dvbdmx->mutex);
1027 return -EINVAL;
1028 }
1029
1030 if (feed->is_filtering)
1031 feed->stop_filtering(feed);
1032
1033 spin_lock_irq(&dvbdmx->lock);
1034 f = dvbdmxfeed->filter;
1035
1036 if (f == dvbdmxfilter) {
1037 dvbdmxfeed->filter = dvbdmxfilter->next;
1038 } else {
1039 while (f->next != dvbdmxfilter)
1040 f = f->next;
1041 f->next = f->next->next;
1042 }
1043
1044 dvbdmxfilter->state = DMX_STATE_FREE;
1045 spin_unlock_irq(&dvbdmx->lock);
1046 mutex_unlock(&dvbdmx->mutex);
1047 return 0;
1048 }
1049
1050 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1051 struct dmx_section_feed **feed,
1052 dmx_section_cb callback)
1053 {
1054 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1055 struct dvb_demux_feed *dvbdmxfeed;
1056
1057 if (mutex_lock_interruptible(&dvbdmx->mutex))
1058 return -ERESTARTSYS;
1059
1060 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1061 mutex_unlock(&dvbdmx->mutex);
1062 return -EBUSY;
1063 }
1064
1065 dvbdmxfeed->type = DMX_TYPE_SEC;
1066 dvbdmxfeed->cb.sec = callback;
1067 dvbdmxfeed->demux = dvbdmx;
1068 dvbdmxfeed->pid = 0xffff;
1069 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1070 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1071 dvbdmxfeed->feed.sec.tsfeedp = 0;
1072 dvbdmxfeed->filter = NULL;
1073 dvbdmxfeed->buffer = NULL;
1074
1075 (*feed) = &dvbdmxfeed->feed.sec;
1076 (*feed)->is_filtering = 0;
1077 (*feed)->parent = demux;
1078 (*feed)->priv = NULL;
1079
1080 (*feed)->set = dmx_section_feed_set;
1081 (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1082 (*feed)->start_filtering = dmx_section_feed_start_filtering;
1083 (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1084 (*feed)->release_filter = dmx_section_feed_release_filter;
1085
1086 mutex_unlock(&dvbdmx->mutex);
1087 return 0;
1088 }
1089
1090 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1091 struct dmx_section_feed *feed)
1092 {
1093 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1094 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1095
1096 mutex_lock(&dvbdmx->mutex);
1097
1098 if (dvbdmxfeed->state == DMX_STATE_FREE) {
1099 mutex_unlock(&dvbdmx->mutex);
1100 return -EINVAL;
1101 }
1102 #ifndef NOBUFS
1103 vfree(dvbdmxfeed->buffer);
1104 dvbdmxfeed->buffer = NULL;
1105 #endif
1106 dvbdmxfeed->state = DMX_STATE_FREE;
1107
1108 dvb_demux_feed_del(dvbdmxfeed);
1109
1110 dvbdmxfeed->pid = 0xffff;
1111
1112 mutex_unlock(&dvbdmx->mutex);
1113 return 0;
1114 }
1115
1116 /******************************************************************************
1117 * dvb_demux kernel data API calls
1118 ******************************************************************************/
1119
1120 static int dvbdmx_open(struct dmx_demux *demux)
1121 {
1122 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1123
1124 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1125 return -EUSERS;
1126
1127 dvbdemux->users++;
1128 return 0;
1129 }
1130
1131 static int dvbdmx_close(struct dmx_demux *demux)
1132 {
1133 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1134
1135 if (dvbdemux->users == 0)
1136 return -ENODEV;
1137
1138 dvbdemux->users--;
1139 //FIXME: release any unneeded resources if users==0
1140 return 0;
1141 }
1142
1143 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1144 {
1145 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1146 void *p;
1147
1148 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1149 return -EINVAL;
1150
1151 p = memdup_user(buf, count);
1152 if (IS_ERR(p))
1153 return PTR_ERR(p);
1154 if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1155 kfree(p);
1156 return -ERESTARTSYS;
1157 }
1158 dvb_dmx_swfilter(dvbdemux, p, count);
1159 kfree(p);
1160 mutex_unlock(&dvbdemux->mutex);
1161
1162 if (signal_pending(current))
1163 return -EINTR;
1164 return count;
1165 }
1166
1167 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1168 struct dmx_frontend *frontend)
1169 {
1170 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1171 struct list_head *head = &dvbdemux->frontend_list;
1172
1173 list_add(&(frontend->connectivity_list), head);
1174
1175 return 0;
1176 }
1177
1178 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1179 struct dmx_frontend *frontend)
1180 {
1181 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1182 struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1183
1184 list_for_each_safe(pos, n, head) {
1185 if (DMX_FE_ENTRY(pos) == frontend) {
1186 list_del(pos);
1187 return 0;
1188 }
1189 }
1190
1191 return -ENODEV;
1192 }
1193
1194 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1195 {
1196 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1197
1198 if (list_empty(&dvbdemux->frontend_list))
1199 return NULL;
1200
1201 return &dvbdemux->frontend_list;
1202 }
1203
1204 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1205 struct dmx_frontend *frontend)
1206 {
1207 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1208
1209 if (demux->frontend)
1210 return -EINVAL;
1211
1212 mutex_lock(&dvbdemux->mutex);
1213
1214 demux->frontend = frontend;
1215 mutex_unlock(&dvbdemux->mutex);
1216 return 0;
1217 }
1218
1219 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1220 {
1221 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1222
1223 mutex_lock(&dvbdemux->mutex);
1224
1225 demux->frontend = NULL;
1226 mutex_unlock(&dvbdemux->mutex);
1227 return 0;
1228 }
1229
1230 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1231 {
1232 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1233
1234 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1235 return 0;
1236 }
1237
1238 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1239 {
1240 int i;
1241 struct dmx_demux *dmx = &dvbdemux->dmx;
1242
1243 dvbdemux->cnt_storage = NULL;
1244 dvbdemux->users = 0;
1245 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1246
1247 if (!dvbdemux->filter)
1248 return -ENOMEM;
1249
1250 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1251 if (!dvbdemux->feed) {
1252 vfree(dvbdemux->filter);
1253 dvbdemux->filter = NULL;
1254 return -ENOMEM;
1255 }
1256 for (i = 0; i < dvbdemux->filternum; i++) {
1257 dvbdemux->filter[i].state = DMX_STATE_FREE;
1258 dvbdemux->filter[i].index = i;
1259 }
1260 for (i = 0; i < dvbdemux->feednum; i++) {
1261 dvbdemux->feed[i].state = DMX_STATE_FREE;
1262 dvbdemux->feed[i].index = i;
1263 }
1264
1265 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1266 if (!dvbdemux->cnt_storage)
1267 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
1268
1269 INIT_LIST_HEAD(&dvbdemux->frontend_list);
1270
1271 for (i = 0; i < DMX_PES_OTHER; i++) {
1272 dvbdemux->pesfilter[i] = NULL;
1273 dvbdemux->pids[i] = 0xffff;
1274 }
1275
1276 INIT_LIST_HEAD(&dvbdemux->feed_list);
1277
1278 dvbdemux->playing = 0;
1279 dvbdemux->recording = 0;
1280 dvbdemux->tsbufp = 0;
1281
1282 if (!dvbdemux->check_crc32)
1283 dvbdemux->check_crc32 = dvb_dmx_crc32;
1284
1285 if (!dvbdemux->memcopy)
1286 dvbdemux->memcopy = dvb_dmx_memcopy;
1287
1288 dmx->frontend = NULL;
1289 dmx->priv = dvbdemux;
1290 dmx->open = dvbdmx_open;
1291 dmx->close = dvbdmx_close;
1292 dmx->write = dvbdmx_write;
1293 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1294 dmx->release_ts_feed = dvbdmx_release_ts_feed;
1295 dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1296 dmx->release_section_feed = dvbdmx_release_section_feed;
1297
1298 dmx->add_frontend = dvbdmx_add_frontend;
1299 dmx->remove_frontend = dvbdmx_remove_frontend;
1300 dmx->get_frontends = dvbdmx_get_frontends;
1301 dmx->connect_frontend = dvbdmx_connect_frontend;
1302 dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1303 dmx->get_pes_pids = dvbdmx_get_pes_pids;
1304
1305 mutex_init(&dvbdemux->mutex);
1306 spin_lock_init(&dvbdemux->lock);
1307
1308 return 0;
1309 }
1310
1311 EXPORT_SYMBOL(dvb_dmx_init);
1312
1313 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1314 {
1315 vfree(dvbdemux->cnt_storage);
1316 vfree(dvbdemux->filter);
1317 vfree(dvbdemux->feed);
1318 }
1319
1320 EXPORT_SYMBOL(dvb_dmx_release);
Linux with added FPC-III support