1 /*-
2 * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
3 * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
4 * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifdef HAVE_KERNEL_OPTION_HEADERS
30 #include "opt_snd.h"
31 #endif
32
33 #include <dev/sound/pcm/sound.h>
34
35 #include "feeder_if.h"
36
37 #define SND_USE_FXDIV
38 #define SND_DECLARE_FXDIV
39 #include "snd_fxdiv_gen.h"
40
41 SND_DECLARE_FILE("$FreeBSD: releng/11.2/sys/dev/sound/pcm/buffer.c 331722 2018-03-29 02:50:57Z eadler $");
42
43 struct snd_dbuf *
44 sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel)
45 {
46 struct snd_dbuf *b;
47
48 b = malloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
49 snprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
50 b->dev = dev;
51 b->channel = channel;
52
53 return b;
54 }
55
56 void
57 sndbuf_destroy(struct snd_dbuf *b)
58 {
59 sndbuf_free(b);
60 free(b, M_DEVBUF);
61 }
62
63 bus_addr_t
64 sndbuf_getbufaddr(struct snd_dbuf *buf)
65 {
66 return (buf->buf_addr);
67 }
68
69 static void
70 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
71 {
72 struct snd_dbuf *b = (struct snd_dbuf *)arg;
73
74 if (snd_verbose > 3) {
75 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
76 (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
77 printf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
78 }
79 if (error == 0)
80 b->buf_addr = segs[0].ds_addr;
81 else
82 b->buf_addr = 0;
83 }
84
85 /*
86 * Allocate memory for DMA buffer. If the device does not use DMA transfers,
87 * the driver can call malloc(9) and sndbuf_setup() itself.
88 */
89
90 int
91 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags,
92 unsigned int size)
93 {
94 int ret;
95
96 b->dmatag = dmatag;
97 b->dmaflags = dmaflags | BUS_DMA_NOWAIT | BUS_DMA_COHERENT;
98 b->maxsize = size;
99 b->bufsize = b->maxsize;
100 b->buf_addr = 0;
101 b->flags |= SNDBUF_F_MANAGED;
102 if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, b->dmaflags,
103 &b->dmamap)) {
104 sndbuf_free(b);
105 return (ENOMEM);
106 }
107 if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
108 sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
109 sndbuf_free(b);
110 return (ENOMEM);
111 }
112
113 ret = sndbuf_resize(b, 2, b->maxsize / 2);
114 if (ret != 0)
115 sndbuf_free(b);
116
117 return (ret);
118 }
119
120 int
121 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
122 {
123 b->flags &= ~SNDBUF_F_MANAGED;
124 if (buf)
125 b->flags |= SNDBUF_F_MANAGED;
126 b->buf = buf;
127 b->maxsize = size;
128 b->bufsize = b->maxsize;
129 return sndbuf_resize(b, 2, b->maxsize / 2);
130 }
131
132 void
133 sndbuf_free(struct snd_dbuf *b)
134 {
135 if (b->tmpbuf)
136 free(b->tmpbuf, M_DEVBUF);
137
138 if (b->shadbuf)
139 free(b->shadbuf, M_DEVBUF);
140
141 if (b->buf) {
142 if (b->flags & SNDBUF_F_MANAGED) {
143 if (b->buf_addr)
144 bus_dmamap_unload(b->dmatag, b->dmamap);
145 if (b->dmatag)
146 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
147 } else
148 free(b->buf, M_DEVBUF);
149 }
150
151 b->tmpbuf = NULL;
152 b->shadbuf = NULL;
153 b->buf = NULL;
154 b->sl = 0;
155 b->dmatag = NULL;
156 b->dmamap = NULL;
157 }
158
159 #define SNDBUF_CACHE_SHIFT 5
160
161 int
162 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
163 {
164 unsigned int bufsize, allocsize;
165 u_int8_t *tmpbuf;
166
167 CHN_LOCK(b->channel);
168 if (b->maxsize == 0)
169 goto out;
170 if (blkcnt == 0)
171 blkcnt = b->blkcnt;
172 if (blksz == 0)
173 blksz = b->blksz;
174 if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz) > b->maxsize) {
175 CHN_UNLOCK(b->channel);
176 return EINVAL;
177 }
178 if (blkcnt == b->blkcnt && blksz == b->blksz)
179 goto out;
180
181 bufsize = blkcnt * blksz;
182
183 if (bufsize > b->allocsize ||
184 bufsize < (b->allocsize >> SNDBUF_CACHE_SHIFT)) {
185 allocsize = round_page(bufsize);
186 CHN_UNLOCK(b->channel);
187 tmpbuf = malloc(allocsize, M_DEVBUF, M_WAITOK);
188 CHN_LOCK(b->channel);
189 if (snd_verbose > 3)
190 printf("%s(): b=%p %p -> %p [%d -> %d : %d]\n",
191 __func__, b, b->tmpbuf, tmpbuf,
192 b->allocsize, allocsize, bufsize);
193 if (b->tmpbuf != NULL)
194 free(b->tmpbuf, M_DEVBUF);
195 b->tmpbuf = tmpbuf;
196 b->allocsize = allocsize;
197 } else if (snd_verbose > 3)
198 printf("%s(): b=%p %d [%d] NOCHANGE\n",
199 __func__, b, b->allocsize, b->bufsize);
200
201 b->blkcnt = blkcnt;
202 b->blksz = blksz;
203 b->bufsize = bufsize;
204
205 sndbuf_reset(b);
206 out:
207 CHN_UNLOCK(b->channel);
208 return 0;
209 }
210
211 int
212 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
213 {
214 unsigned int bufsize, allocsize;
215 u_int8_t *buf, *tmpbuf, *shadbuf;
216
217 if (blkcnt < 2 || blksz < 16)
218 return EINVAL;
219
220 bufsize = blksz * blkcnt;
221
222 if (bufsize > b->allocsize ||
223 bufsize < (b->allocsize >> SNDBUF_CACHE_SHIFT)) {
224 allocsize = round_page(bufsize);
225 CHN_UNLOCK(b->channel);
226 buf = malloc(allocsize, M_DEVBUF, M_WAITOK);
227 tmpbuf = malloc(allocsize, M_DEVBUF, M_WAITOK);
228 shadbuf = malloc(allocsize, M_DEVBUF, M_WAITOK);
229 CHN_LOCK(b->channel);
230 if (b->buf != NULL)
231 free(b->buf, M_DEVBUF);
232 b->buf = buf;
233 if (b->tmpbuf != NULL)
234 free(b->tmpbuf, M_DEVBUF);
235 b->tmpbuf = tmpbuf;
236 if (b->shadbuf != NULL)
237 free(b->shadbuf, M_DEVBUF);
238 b->shadbuf = shadbuf;
239 if (snd_verbose > 3)
240 printf("%s(): b=%p %d -> %d [%d]\n",
241 __func__, b, b->allocsize, allocsize, bufsize);
242 b->allocsize = allocsize;
243 } else if (snd_verbose > 3)
244 printf("%s(): b=%p %d [%d] NOCHANGE\n",
245 __func__, b, b->allocsize, b->bufsize);
246
247 b->blkcnt = blkcnt;
248 b->blksz = blksz;
249 b->bufsize = bufsize;
250 b->maxsize = bufsize;
251 b->sl = bufsize;
252
253 sndbuf_reset(b);
254
255 return 0;
256 }
257
258 /**
259 * @brief Zero out space in buffer free area
260 *
261 * This function clears a chunk of @c length bytes in the buffer free area
262 * (i.e., where the next write will be placed).
263 *
264 * @param b buffer context
265 * @param length number of bytes to blank
266 */
267 void
268 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
269 {
270 int i;
271 u_char data, *p;
272
273 if (length == 0)
274 return;
275 if (length > b->bufsize)
276 length = b->bufsize;
277
278 data = sndbuf_zerodata(b->fmt);
279
280 i = sndbuf_getfreeptr(b);
281 p = sndbuf_getbuf(b);
282 while (length > 0) {
283 p[i] = data;
284 length--;
285 i++;
286 if (i >= b->bufsize)
287 i = 0;
288 }
289 }
290
291 /**
292 * @brief Zap buffer contents, resetting "ready area" fields
293 *
294 * @param b buffer context
295 */
296 void
297 sndbuf_fillsilence(struct snd_dbuf *b)
298 {
299 if (b->bufsize > 0)
300 memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
301 b->rp = 0;
302 b->rl = b->bufsize;
303 }
304
305 void
306 sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl)
307 {
308 if (b->bufsize > 0)
309 memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
310 b->rp = 0;
311 b->rl = min(b->bufsize, rl);
312 }
313
314 /**
315 * @brief Reset buffer w/o flushing statistics
316 *
317 * This function just zeroes out buffer contents and sets the "ready length"
318 * to zero. This was originally to facilitate minimal playback interruption
319 * (i.e., dropped samples) in SNDCTL_DSP_SILENCE/SKIP ioctls.
320 *
321 * @param b buffer context
322 */
323 void
324 sndbuf_softreset(struct snd_dbuf *b)
325 {
326 b->rl = 0;
327 if (b->buf && b->bufsize > 0)
328 sndbuf_clear(b, b->bufsize);
329 }
330
331 void
332 sndbuf_reset(struct snd_dbuf *b)
333 {
334 b->hp = 0;
335 b->rp = 0;
336 b->rl = 0;
337 b->dl = 0;
338 b->prev_total = 0;
339 b->total = 0;
340 b->xrun = 0;
341 if (b->buf && b->bufsize > 0)
342 sndbuf_clear(b, b->bufsize);
343 sndbuf_clearshadow(b);
344 }
345
346 u_int32_t
347 sndbuf_getfmt(struct snd_dbuf *b)
348 {
349 return b->fmt;
350 }
351
352 int
353 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
354 {
355 b->fmt = fmt;
356 b->bps = AFMT_BPS(b->fmt);
357 b->align = AFMT_ALIGN(b->fmt);
358 #if 0
359 b->bps = AFMT_CHANNEL(b->fmt);
360 if (b->fmt & AFMT_16BIT)
361 b->bps <<= 1;
362 else if (b->fmt & AFMT_24BIT)
363 b->bps *= 3;
364 else if (b->fmt & AFMT_32BIT)
365 b->bps <<= 2;
366 #endif
367 return 0;
368 }
369
370 unsigned int
371 sndbuf_getspd(struct snd_dbuf *b)
372 {
373 return b->spd;
374 }
375
376 void
377 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
378 {
379 b->spd = spd;
380 }
381
382 unsigned int
383 sndbuf_getalign(struct snd_dbuf *b)
384 {
385 return (b->align);
386 }
387
388 unsigned int
389 sndbuf_getblkcnt(struct snd_dbuf *b)
390 {
391 return b->blkcnt;
392 }
393
394 void
395 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
396 {
397 b->blkcnt = blkcnt;
398 }
399
400 unsigned int
401 sndbuf_getblksz(struct snd_dbuf *b)
402 {
403 return b->blksz;
404 }
405
406 void
407 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
408 {
409 b->blksz = blksz;
410 }
411
412 unsigned int
413 sndbuf_getbps(struct snd_dbuf *b)
414 {
415 return b->bps;
416 }
417
418 void *
419 sndbuf_getbuf(struct snd_dbuf *b)
420 {
421 return b->buf;
422 }
423
424 void *
425 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
426 {
427 KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
428
429 return b->buf + ofs;
430 }
431
432 unsigned int
433 sndbuf_getsize(struct snd_dbuf *b)
434 {
435 return b->bufsize;
436 }
437
438 unsigned int
439 sndbuf_getmaxsize(struct snd_dbuf *b)
440 {
441 return b->maxsize;
442 }
443
444 unsigned int
445 sndbuf_getallocsize(struct snd_dbuf *b)
446 {
447 return b->allocsize;
448 }
449
450 unsigned int
451 sndbuf_runsz(struct snd_dbuf *b)
452 {
453 return b->dl;
454 }
455
456 void
457 sndbuf_setrun(struct snd_dbuf *b, int go)
458 {
459 b->dl = go? b->blksz : 0;
460 }
461
462 struct selinfo *
463 sndbuf_getsel(struct snd_dbuf *b)
464 {
465 return &b->sel;
466 }
467
468 /************************************************************/
469 unsigned int
470 sndbuf_getxrun(struct snd_dbuf *b)
471 {
472 SNDBUF_LOCKASSERT(b);
473
474 return b->xrun;
475 }
476
477 void
478 sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun)
479 {
480 SNDBUF_LOCKASSERT(b);
481
482 b->xrun = xrun;
483 }
484
485 unsigned int
486 sndbuf_gethwptr(struct snd_dbuf *b)
487 {
488 SNDBUF_LOCKASSERT(b);
489
490 return b->hp;
491 }
492
493 void
494 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
495 {
496 SNDBUF_LOCKASSERT(b);
497
498 b->hp = ptr;
499 }
500
501 unsigned int
502 sndbuf_getready(struct snd_dbuf *b)
503 {
504 SNDBUF_LOCKASSERT(b);
505 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
506
507 return b->rl;
508 }
509
510 unsigned int
511 sndbuf_getreadyptr(struct snd_dbuf *b)
512 {
513 SNDBUF_LOCKASSERT(b);
514 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
515
516 return b->rp;
517 }
518
519 unsigned int
520 sndbuf_getfree(struct snd_dbuf *b)
521 {
522 SNDBUF_LOCKASSERT(b);
523 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
524
525 return b->bufsize - b->rl;
526 }
527
528 unsigned int
529 sndbuf_getfreeptr(struct snd_dbuf *b)
530 {
531 SNDBUF_LOCKASSERT(b);
532 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
533 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
534
535 return (b->rp + b->rl) % b->bufsize;
536 }
537
538 u_int64_t
539 sndbuf_getblocks(struct snd_dbuf *b)
540 {
541 SNDBUF_LOCKASSERT(b);
542
543 return b->total / b->blksz;
544 }
545
546 u_int64_t
547 sndbuf_getprevblocks(struct snd_dbuf *b)
548 {
549 SNDBUF_LOCKASSERT(b);
550
551 return b->prev_total / b->blksz;
552 }
553
554 u_int64_t
555 sndbuf_gettotal(struct snd_dbuf *b)
556 {
557 SNDBUF_LOCKASSERT(b);
558
559 return b->total;
560 }
561
562 u_int64_t
563 sndbuf_getprevtotal(struct snd_dbuf *b)
564 {
565 SNDBUF_LOCKASSERT(b);
566
567 return b->prev_total;
568 }
569
570 void
571 sndbuf_updateprevtotal(struct snd_dbuf *b)
572 {
573 SNDBUF_LOCKASSERT(b);
574
575 b->prev_total = b->total;
576 }
577
578 unsigned int
579 sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to)
580 {
581 if (from == NULL || to == NULL || v == 0)
582 return 0;
583
584 return snd_xbytes(v, sndbuf_getalign(from) * sndbuf_getspd(from),
585 sndbuf_getalign(to) * sndbuf_getspd(to));
586 }
587
588 u_int8_t
589 sndbuf_zerodata(u_int32_t fmt)
590 {
591 if (fmt & (AFMT_SIGNED | AFMT_PASSTHROUGH))
592 return (0x00);
593 else if (fmt & AFMT_MU_LAW)
594 return (0x7f);
595 else if (fmt & AFMT_A_LAW)
596 return (0x55);
597 return (0x80);
598 }
599
600 /************************************************************/
601
602 /**
603 * @brief Acquire buffer space to extend ready area
604 *
605 * This function extends the ready area length by @c count bytes, and may
606 * optionally copy samples from another location stored in @c from. The
607 * counter @c snd_dbuf::total is also incremented by @c count bytes.
608 *
609 * @param b audio buffer
610 * @param from sample source (optional)
611 * @param count number of bytes to acquire
612 *
613 * @retval 0 Unconditional
614 */
615 int
616 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
617 {
618 int l;
619
620 KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b)));
621 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
622 b->total += count;
623 if (from != NULL) {
624 while (count > 0) {
625 l = min(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
626 bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
627 from += l;
628 b->rl += l;
629 count -= l;
630 }
631 } else
632 b->rl += count;
633 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
634
635 return 0;
636 }
637
638 /**
639 * @brief Dispose samples from channel buffer, increasing size of ready area
640 *
641 * This function discards samples from the supplied buffer by advancing the
642 * ready area start pointer and decrementing the ready area length. If
643 * @c to is not NULL, then the discard samples will be copied to the location
644 * it points to.
645 *
646 * @param b PCM channel sound buffer
647 * @param to destination buffer (optional)
648 * @param count number of bytes to discard
649 *
650 * @returns 0 unconditionally
651 */
652 int
653 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
654 {
655 int l;
656
657 KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
658 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
659 if (to != NULL) {
660 while (count > 0) {
661 l = min(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
662 bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
663 to += l;
664 b->rl -= l;
665 b->rp = (b->rp + l) % b->bufsize;
666 count -= l;
667 }
668 } else {
669 b->rl -= count;
670 b->rp = (b->rp + count) % b->bufsize;
671 }
672 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
673
674 return 0;
675 }
676
677 #ifdef SND_DIAGNOSTIC
678 static uint32_t snd_feeder_maxfeed = 0;
679 SYSCTL_UINT(_hw_snd, OID_AUTO, feeder_maxfeed, CTLFLAG_RD,
680 &snd_feeder_maxfeed, 0, "maximum feeder count request");
681
682 static uint32_t snd_feeder_maxcycle = 0;
683 SYSCTL_UINT(_hw_snd, OID_AUTO, feeder_maxcycle, CTLFLAG_RD,
684 &snd_feeder_maxcycle, 0, "maximum feeder cycle");
685 #endif
686
687 /* count is number of bytes we want added to destination buffer */
688 int
689 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
690 {
691 unsigned int cnt, maxfeed;
692 #ifdef SND_DIAGNOSTIC
693 unsigned int cycle;
694
695 if (count > snd_feeder_maxfeed)
696 snd_feeder_maxfeed = count;
697
698 cycle = 0;
699 #endif
700
701 KASSERT(count > 0, ("can't feed 0 bytes"));
702
703 if (sndbuf_getfree(to) < count)
704 return (EINVAL);
705
706 maxfeed = SND_FXROUND(SND_FXDIV_MAX, sndbuf_getalign(to));
707
708 do {
709 cnt = FEEDER_FEED(feeder, channel, to->tmpbuf,
710 min(count, maxfeed), from);
711 if (cnt == 0)
712 break;
713 sndbuf_acquire(to, to->tmpbuf, cnt);
714 count -= cnt;
715 #ifdef SND_DIAGNOSTIC
716 cycle++;
717 #endif
718 } while (count != 0);
719
720 #ifdef SND_DIAGNOSTIC
721 if (cycle > snd_feeder_maxcycle)
722 snd_feeder_maxcycle = cycle;
723 #endif
724
725 return (0);
726 }
727
728 /************************************************************/
729
730 void
731 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
732 {
733 printf("%s: [", s);
734 if (what & 0x01)
735 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
736 if (what & 0x02)
737 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
738 if (what & 0x04)
739 printf(" total: %ju, prev_total: %ju, xrun: %d", (uintmax_t)b->total, (uintmax_t)b->prev_total, b->xrun);
740 if (what & 0x08)
741 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
742 if (what & 0x10)
743 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
744 printf(" ]\n");
745 }
746
747 /************************************************************/
748 u_int32_t
749 sndbuf_getflags(struct snd_dbuf *b)
750 {
751 return b->flags;
752 }
753
754 void
755 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
756 {
757 b->flags &= ~flags;
758 if (on)
759 b->flags |= flags;
760 }
761
762 /**
763 * @brief Clear the shadow buffer by filling with samples equal to zero.
764 *
765 * @param b buffer to clear
766 */
767 void
768 sndbuf_clearshadow(struct snd_dbuf *b)
769 {
770 KASSERT(b != NULL, ("b is a null pointer"));
771 KASSERT(b->sl >= 0, ("illegal shadow length"));
772
773 if ((b->shadbuf != NULL) && (b->sl > 0))
774 memset(b->shadbuf, sndbuf_zerodata(b->fmt), b->sl);
775 }
776
777 #ifdef OSSV4_EXPERIMENT
778 /**
779 * @brief Return peak value from samples in buffer ready area.
780 *
781 * Peak ranges from 0-32767. If channel is monaural, most significant 16
782 * bits will be zero. For now, only expects to work with 1-2 channel
783 * buffers.
784 *
785 * @note Currently only operates with linear PCM formats.
786 *
787 * @param b buffer to analyze
788 * @param lpeak pointer to store left peak value
789 * @param rpeak pointer to store right peak value
790 */
791 void
792 sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp)
793 {
794 u_int32_t lpeak, rpeak;
795
796 lpeak = 0;
797 rpeak = 0;
798
799 /**
800 * @todo fill this in later
801 */
802 }
803 #endif
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