1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
5 * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
6 * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifdef HAVE_KERNEL_OPTION_HEADERS
32 #include "opt_snd.h"
33 #endif
34
35 #include <dev/sound/pcm/sound.h>
36
37 #include "feeder_if.h"
38
39 #define SND_USE_FXDIV
40 #define SND_DECLARE_FXDIV
41 #include "snd_fxdiv_gen.h"
42
43 SND_DECLARE_FILE("$FreeBSD$");
44
45 struct snd_dbuf *
46 sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel)
47 {
48 struct snd_dbuf *b;
49
50 b = malloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
51 snprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
52 b->dev = dev;
53 b->channel = channel;
54
55 return b;
56 }
57
58 void
59 sndbuf_destroy(struct snd_dbuf *b)
60 {
61 sndbuf_free(b);
62 free(b, M_DEVBUF);
63 }
64
65 bus_addr_t
66 sndbuf_getbufaddr(struct snd_dbuf *buf)
67 {
68 return (buf->buf_addr);
69 }
70
71 static void
72 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
73 {
74 struct snd_dbuf *b = (struct snd_dbuf *)arg;
75
76 if (snd_verbose > 3) {
77 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
78 (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
79 printf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
80 }
81 if (error == 0)
82 b->buf_addr = segs[0].ds_addr;
83 else
84 b->buf_addr = 0;
85 }
86
87 /*
88 * Allocate memory for DMA buffer. If the device does not use DMA transfers,
89 * the driver can call malloc(9) and sndbuf_setup() itself.
90 */
91
92 int
93 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags,
94 unsigned int size)
95 {
96 int ret;
97
98 b->dmatag = dmatag;
99 b->dmaflags = dmaflags | BUS_DMA_NOWAIT | BUS_DMA_COHERENT;
100 b->maxsize = size;
101 b->bufsize = b->maxsize;
102 b->buf_addr = 0;
103 b->flags |= SNDBUF_F_MANAGED;
104 if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, b->dmaflags,
105 &b->dmamap)) {
106 sndbuf_free(b);
107 return (ENOMEM);
108 }
109 if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
110 sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
111 sndbuf_free(b);
112 return (ENOMEM);
113 }
114
115 ret = sndbuf_resize(b, 2, b->maxsize / 2);
116 if (ret != 0)
117 sndbuf_free(b);
118
119 return (ret);
120 }
121
122 int
123 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
124 {
125 b->flags &= ~SNDBUF_F_MANAGED;
126 if (buf)
127 b->flags |= SNDBUF_F_MANAGED;
128 b->buf = buf;
129 b->maxsize = size;
130 b->bufsize = b->maxsize;
131 return sndbuf_resize(b, 2, b->maxsize / 2);
132 }
133
134 void
135 sndbuf_free(struct snd_dbuf *b)
136 {
137 if (b->tmpbuf)
138 free(b->tmpbuf, M_DEVBUF);
139
140 if (b->shadbuf)
141 free(b->shadbuf, M_DEVBUF);
142
143 if (b->buf) {
144 if (b->flags & SNDBUF_F_MANAGED) {
145 if (b->buf_addr)
146 bus_dmamap_unload(b->dmatag, b->dmamap);
147 if (b->dmatag)
148 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
149 } else
150 free(b->buf, M_DEVBUF);
151 }
152
153 b->tmpbuf = NULL;
154 b->shadbuf = NULL;
155 b->buf = NULL;
156 b->sl = 0;
157 b->dmatag = NULL;
158 b->dmamap = NULL;
159 }
160
161 #define SNDBUF_CACHE_SHIFT 5
162
163 int
164 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
165 {
166 unsigned int bufsize, allocsize;
167 u_int8_t *tmpbuf;
168
169 CHN_LOCK(b->channel);
170 if (b->maxsize == 0)
171 goto out;
172 if (blkcnt == 0)
173 blkcnt = b->blkcnt;
174 if (blksz == 0)
175 blksz = b->blksz;
176 if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz) > b->maxsize) {
177 CHN_UNLOCK(b->channel);
178 return EINVAL;
179 }
180 if (blkcnt == b->blkcnt && blksz == b->blksz)
181 goto out;
182
183 bufsize = blkcnt * blksz;
184
185 if (bufsize > b->allocsize ||
186 bufsize < (b->allocsize >> SNDBUF_CACHE_SHIFT)) {
187 allocsize = round_page(bufsize);
188 CHN_UNLOCK(b->channel);
189 tmpbuf = malloc(allocsize, M_DEVBUF, M_WAITOK);
190 CHN_LOCK(b->channel);
191 if (snd_verbose > 3)
192 printf("%s(): b=%p %p -> %p [%d -> %d : %d]\n",
193 __func__, b, b->tmpbuf, tmpbuf,
194 b->allocsize, allocsize, bufsize);
195 if (b->tmpbuf != NULL)
196 free(b->tmpbuf, M_DEVBUF);
197 b->tmpbuf = tmpbuf;
198 b->allocsize = allocsize;
199 } else if (snd_verbose > 3)
200 printf("%s(): b=%p %d [%d] NOCHANGE\n",
201 __func__, b, b->allocsize, b->bufsize);
202
203 b->blkcnt = blkcnt;
204 b->blksz = blksz;
205 b->bufsize = bufsize;
206
207 sndbuf_reset(b);
208 out:
209 CHN_UNLOCK(b->channel);
210 return 0;
211 }
212
213 int
214 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
215 {
216 unsigned int bufsize, allocsize;
217 u_int8_t *buf, *tmpbuf, *shadbuf;
218
219 if (blkcnt < 2 || blksz < 16)
220 return EINVAL;
221
222 bufsize = blksz * blkcnt;
223
224 if (bufsize > b->allocsize ||
225 bufsize < (b->allocsize >> SNDBUF_CACHE_SHIFT)) {
226 allocsize = round_page(bufsize);
227 CHN_UNLOCK(b->channel);
228 buf = malloc(allocsize, M_DEVBUF, M_WAITOK);
229 tmpbuf = malloc(allocsize, M_DEVBUF, M_WAITOK);
230 shadbuf = malloc(allocsize, M_DEVBUF, M_WAITOK);
231 CHN_LOCK(b->channel);
232 if (b->buf != NULL)
233 free(b->buf, M_DEVBUF);
234 b->buf = buf;
235 if (b->tmpbuf != NULL)
236 free(b->tmpbuf, M_DEVBUF);
237 b->tmpbuf = tmpbuf;
238 if (b->shadbuf != NULL)
239 free(b->shadbuf, M_DEVBUF);
240 b->shadbuf = shadbuf;
241 if (snd_verbose > 3)
242 printf("%s(): b=%p %d -> %d [%d]\n",
243 __func__, b, b->allocsize, allocsize, bufsize);
244 b->allocsize = allocsize;
245 } else if (snd_verbose > 3)
246 printf("%s(): b=%p %d [%d] NOCHANGE\n",
247 __func__, b, b->allocsize, b->bufsize);
248
249 b->blkcnt = blkcnt;
250 b->blksz = blksz;
251 b->bufsize = bufsize;
252 b->maxsize = bufsize;
253 b->sl = bufsize;
254
255 sndbuf_reset(b);
256
257 return 0;
258 }
259
260 /**
261 * @brief Zero out space in buffer free area
262 *
263 * This function clears a chunk of @c length bytes in the buffer free area
264 * (i.e., where the next write will be placed).
265 *
266 * @param b buffer context
267 * @param length number of bytes to blank
268 */
269 void
270 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
271 {
272 int i;
273 u_char data, *p;
274
275 if (length == 0)
276 return;
277 if (length > b->bufsize)
278 length = b->bufsize;
279
280 data = sndbuf_zerodata(b->fmt);
281
282 i = sndbuf_getfreeptr(b);
283 p = sndbuf_getbuf(b);
284 while (length > 0) {
285 p[i] = data;
286 length--;
287 i++;
288 if (i >= b->bufsize)
289 i = 0;
290 }
291 }
292
293 /**
294 * @brief Zap buffer contents, resetting "ready area" fields
295 *
296 * @param b buffer context
297 */
298 void
299 sndbuf_fillsilence(struct snd_dbuf *b)
300 {
301 if (b->bufsize > 0)
302 memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
303 b->rp = 0;
304 b->rl = b->bufsize;
305 }
306
307 void
308 sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl)
309 {
310 if (b->bufsize > 0)
311 memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
312 b->rp = 0;
313 b->rl = min(b->bufsize, rl);
314 }
315
316 /**
317 * @brief Reset buffer w/o flushing statistics
318 *
319 * This function just zeroes out buffer contents and sets the "ready length"
320 * to zero. This was originally to facilitate minimal playback interruption
321 * (i.e., dropped samples) in SNDCTL_DSP_SILENCE/SKIP ioctls.
322 *
323 * @param b buffer context
324 */
325 void
326 sndbuf_softreset(struct snd_dbuf *b)
327 {
328 b->rl = 0;
329 if (b->buf && b->bufsize > 0)
330 sndbuf_clear(b, b->bufsize);
331 }
332
333 void
334 sndbuf_reset(struct snd_dbuf *b)
335 {
336 b->hp = 0;
337 b->rp = 0;
338 b->rl = 0;
339 b->dl = 0;
340 b->prev_total = 0;
341 b->total = 0;
342 b->xrun = 0;
343 if (b->buf && b->bufsize > 0)
344 sndbuf_clear(b, b->bufsize);
345 sndbuf_clearshadow(b);
346 }
347
348 u_int32_t
349 sndbuf_getfmt(struct snd_dbuf *b)
350 {
351 return b->fmt;
352 }
353
354 int
355 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
356 {
357 b->fmt = fmt;
358 b->bps = AFMT_BPS(b->fmt);
359 b->align = AFMT_ALIGN(b->fmt);
360 #if 0
361 b->bps = AFMT_CHANNEL(b->fmt);
362 if (b->fmt & AFMT_16BIT)
363 b->bps <<= 1;
364 else if (b->fmt & AFMT_24BIT)
365 b->bps *= 3;
366 else if (b->fmt & AFMT_32BIT)
367 b->bps <<= 2;
368 #endif
369 return 0;
370 }
371
372 unsigned int
373 sndbuf_getspd(struct snd_dbuf *b)
374 {
375 return b->spd;
376 }
377
378 void
379 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
380 {
381 b->spd = spd;
382 }
383
384 unsigned int
385 sndbuf_getalign(struct snd_dbuf *b)
386 {
387 return (b->align);
388 }
389
390 unsigned int
391 sndbuf_getblkcnt(struct snd_dbuf *b)
392 {
393 return b->blkcnt;
394 }
395
396 void
397 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
398 {
399 b->blkcnt = blkcnt;
400 }
401
402 unsigned int
403 sndbuf_getblksz(struct snd_dbuf *b)
404 {
405 return b->blksz;
406 }
407
408 void
409 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
410 {
411 b->blksz = blksz;
412 }
413
414 unsigned int
415 sndbuf_getbps(struct snd_dbuf *b)
416 {
417 return b->bps;
418 }
419
420 void *
421 sndbuf_getbuf(struct snd_dbuf *b)
422 {
423 return b->buf;
424 }
425
426 void *
427 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
428 {
429 KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
430
431 return b->buf + ofs;
432 }
433
434 unsigned int
435 sndbuf_getsize(struct snd_dbuf *b)
436 {
437 return b->bufsize;
438 }
439
440 unsigned int
441 sndbuf_getmaxsize(struct snd_dbuf *b)
442 {
443 return b->maxsize;
444 }
445
446 unsigned int
447 sndbuf_getallocsize(struct snd_dbuf *b)
448 {
449 return b->allocsize;
450 }
451
452 unsigned int
453 sndbuf_runsz(struct snd_dbuf *b)
454 {
455 return b->dl;
456 }
457
458 void
459 sndbuf_setrun(struct snd_dbuf *b, int go)
460 {
461 b->dl = go? b->blksz : 0;
462 }
463
464 struct selinfo *
465 sndbuf_getsel(struct snd_dbuf *b)
466 {
467 return &b->sel;
468 }
469
470 /************************************************************/
471 unsigned int
472 sndbuf_getxrun(struct snd_dbuf *b)
473 {
474 SNDBUF_LOCKASSERT(b);
475
476 return b->xrun;
477 }
478
479 void
480 sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun)
481 {
482 SNDBUF_LOCKASSERT(b);
483
484 b->xrun = xrun;
485 }
486
487 unsigned int
488 sndbuf_gethwptr(struct snd_dbuf *b)
489 {
490 SNDBUF_LOCKASSERT(b);
491
492 return b->hp;
493 }
494
495 void
496 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
497 {
498 SNDBUF_LOCKASSERT(b);
499
500 b->hp = ptr;
501 }
502
503 unsigned int
504 sndbuf_getready(struct snd_dbuf *b)
505 {
506 SNDBUF_LOCKASSERT(b);
507 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
508
509 return b->rl;
510 }
511
512 unsigned int
513 sndbuf_getreadyptr(struct snd_dbuf *b)
514 {
515 SNDBUF_LOCKASSERT(b);
516 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
517
518 return b->rp;
519 }
520
521 unsigned int
522 sndbuf_getfree(struct snd_dbuf *b)
523 {
524 SNDBUF_LOCKASSERT(b);
525 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
526
527 return b->bufsize - b->rl;
528 }
529
530 unsigned int
531 sndbuf_getfreeptr(struct snd_dbuf *b)
532 {
533 SNDBUF_LOCKASSERT(b);
534 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
535 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
536
537 return (b->rp + b->rl) % b->bufsize;
538 }
539
540 u_int64_t
541 sndbuf_getblocks(struct snd_dbuf *b)
542 {
543 SNDBUF_LOCKASSERT(b);
544
545 return b->total / b->blksz;
546 }
547
548 u_int64_t
549 sndbuf_getprevblocks(struct snd_dbuf *b)
550 {
551 SNDBUF_LOCKASSERT(b);
552
553 return b->prev_total / b->blksz;
554 }
555
556 u_int64_t
557 sndbuf_gettotal(struct snd_dbuf *b)
558 {
559 SNDBUF_LOCKASSERT(b);
560
561 return b->total;
562 }
563
564 u_int64_t
565 sndbuf_getprevtotal(struct snd_dbuf *b)
566 {
567 SNDBUF_LOCKASSERT(b);
568
569 return b->prev_total;
570 }
571
572 void
573 sndbuf_updateprevtotal(struct snd_dbuf *b)
574 {
575 SNDBUF_LOCKASSERT(b);
576
577 b->prev_total = b->total;
578 }
579
580 unsigned int
581 sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to)
582 {
583 if (from == NULL || to == NULL || v == 0)
584 return 0;
585
586 return snd_xbytes(v, sndbuf_getalign(from) * sndbuf_getspd(from),
587 sndbuf_getalign(to) * sndbuf_getspd(to));
588 }
589
590 u_int8_t
591 sndbuf_zerodata(u_int32_t fmt)
592 {
593 if (fmt & (AFMT_SIGNED | AFMT_PASSTHROUGH))
594 return (0x00);
595 else if (fmt & AFMT_MU_LAW)
596 return (0x7f);
597 else if (fmt & AFMT_A_LAW)
598 return (0x55);
599 return (0x80);
600 }
601
602 /************************************************************/
603
604 /**
605 * @brief Acquire buffer space to extend ready area
606 *
607 * This function extends the ready area length by @c count bytes, and may
608 * optionally copy samples from another location stored in @c from. The
609 * counter @c snd_dbuf::total is also incremented by @c count bytes.
610 *
611 * @param b audio buffer
612 * @param from sample source (optional)
613 * @param count number of bytes to acquire
614 *
615 * @retval 0 Unconditional
616 */
617 int
618 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
619 {
620 int l;
621
622 KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b)));
623 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
624 b->total += count;
625 if (from != NULL) {
626 while (count > 0) {
627 l = min(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
628 bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
629 from += l;
630 b->rl += l;
631 count -= l;
632 }
633 } else
634 b->rl += count;
635 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
636
637 return 0;
638 }
639
640 /**
641 * @brief Dispose samples from channel buffer, increasing size of ready area
642 *
643 * This function discards samples from the supplied buffer by advancing the
644 * ready area start pointer and decrementing the ready area length. If
645 * @c to is not NULL, then the discard samples will be copied to the location
646 * it points to.
647 *
648 * @param b PCM channel sound buffer
649 * @param to destination buffer (optional)
650 * @param count number of bytes to discard
651 *
652 * @returns 0 unconditionally
653 */
654 int
655 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
656 {
657 int l;
658
659 KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
660 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
661 if (to != NULL) {
662 while (count > 0) {
663 l = min(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
664 bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
665 to += l;
666 b->rl -= l;
667 b->rp = (b->rp + l) % b->bufsize;
668 count -= l;
669 }
670 } else {
671 b->rl -= count;
672 b->rp = (b->rp + count) % b->bufsize;
673 }
674 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
675
676 return 0;
677 }
678
679 #ifdef SND_DIAGNOSTIC
680 static uint32_t snd_feeder_maxfeed = 0;
681 SYSCTL_UINT(_hw_snd, OID_AUTO, feeder_maxfeed, CTLFLAG_RD,
682 &snd_feeder_maxfeed, 0, "maximum feeder count request");
683
684 static uint32_t snd_feeder_maxcycle = 0;
685 SYSCTL_UINT(_hw_snd, OID_AUTO, feeder_maxcycle, CTLFLAG_RD,
686 &snd_feeder_maxcycle, 0, "maximum feeder cycle");
687 #endif
688
689 /* count is number of bytes we want added to destination buffer */
690 int
691 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
692 {
693 unsigned int cnt, maxfeed;
694 #ifdef SND_DIAGNOSTIC
695 unsigned int cycle;
696
697 if (count > snd_feeder_maxfeed)
698 snd_feeder_maxfeed = count;
699
700 cycle = 0;
701 #endif
702
703 KASSERT(count > 0, ("can't feed 0 bytes"));
704
705 if (sndbuf_getfree(to) < count)
706 return (EINVAL);
707
708 maxfeed = SND_FXROUND(SND_FXDIV_MAX, sndbuf_getalign(to));
709
710 do {
711 cnt = FEEDER_FEED(feeder, channel, to->tmpbuf,
712 min(count, maxfeed), from);
713 if (cnt == 0)
714 break;
715 sndbuf_acquire(to, to->tmpbuf, cnt);
716 count -= cnt;
717 #ifdef SND_DIAGNOSTIC
718 cycle++;
719 #endif
720 } while (count != 0);
721
722 #ifdef SND_DIAGNOSTIC
723 if (cycle > snd_feeder_maxcycle)
724 snd_feeder_maxcycle = cycle;
725 #endif
726
727 return (0);
728 }
729
730 /************************************************************/
731
732 void
733 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
734 {
735 printf("%s: [", s);
736 if (what & 0x01)
737 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
738 if (what & 0x02)
739 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
740 if (what & 0x04)
741 printf(" total: %ju, prev_total: %ju, xrun: %d", (uintmax_t)b->total, (uintmax_t)b->prev_total, b->xrun);
742 if (what & 0x08)
743 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
744 if (what & 0x10)
745 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
746 printf(" ]\n");
747 }
748
749 /************************************************************/
750 u_int32_t
751 sndbuf_getflags(struct snd_dbuf *b)
752 {
753 return b->flags;
754 }
755
756 void
757 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
758 {
759 b->flags &= ~flags;
760 if (on)
761 b->flags |= flags;
762 }
763
764 /**
765 * @brief Clear the shadow buffer by filling with samples equal to zero.
766 *
767 * @param b buffer to clear
768 */
769 void
770 sndbuf_clearshadow(struct snd_dbuf *b)
771 {
772 KASSERT(b != NULL, ("b is a null pointer"));
773 KASSERT(b->sl >= 0, ("illegal shadow length"));
774
775 if ((b->shadbuf != NULL) && (b->sl > 0))
776 memset(b->shadbuf, sndbuf_zerodata(b->fmt), b->sl);
777 }
778
779 #ifdef OSSV4_EXPERIMENT
780 /**
781 * @brief Return peak value from samples in buffer ready area.
782 *
783 * Peak ranges from 0-32767. If channel is monaural, most significant 16
784 * bits will be zero. For now, only expects to work with 1-2 channel
785 * buffers.
786 *
787 * @note Currently only operates with linear PCM formats.
788 *
789 * @param b buffer to analyze
790 * @param lpeak pointer to store left peak value
791 * @param rpeak pointer to store right peak value
792 */
793 void
794 sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp)
795 {
796 u_int32_t lpeak, rpeak;
797
798 lpeak = 0;
799 rpeak = 0;
800
801 /**
802 * @todo fill this in later
803 */
804 }
805 #endif
Cache object: 2cd5f5235a148b57a6021db26f1d429a
|