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 #include "snd_fxdiv_gen.h"
39
40 SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pcm/buffer.c 267762 2014-06-23 03:45:39Z kan $");
41
42 struct snd_dbuf *
sndbuf_create(device_t dev,char * drv,char * desc,struct pcm_channel * channel)43 sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel)
44 {
45 struct snd_dbuf *b;
46
47 b = kmalloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
48 ksnprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
49 b->dev = dev;
50 b->channel = channel;
51
52 return b;
53 }
54
55 void
sndbuf_destroy(struct snd_dbuf * b)56 sndbuf_destroy(struct snd_dbuf *b)
57 {
58 sndbuf_free(b);
59 kfree(b, M_DEVBUF);
60 }
61
62 bus_addr_t
sndbuf_getbufaddr(struct snd_dbuf * buf)63 sndbuf_getbufaddr(struct snd_dbuf *buf)
64 {
65 return (buf->buf_addr);
66 }
67
68 static void
sndbuf_setmap(void * arg,bus_dma_segment_t * segs,int nseg,int error)69 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
70 {
71 struct snd_dbuf *b = (struct snd_dbuf *)arg;
72
73 if (snd_verbose > 3) {
74 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
75 (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
76 kprintf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
77 }
78 if (error == 0)
79 b->buf_addr = segs[0].ds_addr;
80 else
81 b->buf_addr = 0;
82 }
83
84 /*
85 * Allocate memory for DMA buffer. If the device does not use DMA transfers,
86 * the driver can call malloc(9) and sndbuf_setup() itself.
87 */
88
89 int
sndbuf_alloc(struct snd_dbuf * b,bus_dma_tag_t dmatag,int dmaflags,unsigned int size)90 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags,
91 unsigned int size)
92 {
93 int ret;
94
95 b->dmatag = dmatag;
96 b->dmaflags = dmaflags | BUS_DMA_NOWAIT | BUS_DMA_COHERENT;
97 b->maxsize = size;
98 b->bufsize = b->maxsize;
99 b->buf_addr = 0;
100 b->flags |= SNDBUF_F_MANAGED;
101 if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, b->dmaflags,
102 &b->dmamap)) {
103 sndbuf_free(b);
104 return (ENOMEM);
105 }
106 if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
107 sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
108 sndbuf_free(b);
109 return (ENOMEM);
110 }
111
112 ret = sndbuf_resize(b, 2, b->maxsize / 2);
113 if (ret != 0)
114 sndbuf_free(b);
115
116 return (ret);
117 }
118
119 int
sndbuf_setup(struct snd_dbuf * b,void * buf,unsigned int size)120 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
121 {
122 b->flags &= ~SNDBUF_F_MANAGED;
123 if (buf)
124 b->flags |= SNDBUF_F_MANAGED;
125 b->buf = buf;
126 b->maxsize = size;
127 b->bufsize = b->maxsize;
128 return sndbuf_resize(b, 2, b->maxsize / 2);
129 }
130
131 void
sndbuf_free(struct snd_dbuf * b)132 sndbuf_free(struct snd_dbuf *b)
133 {
134 if (b->tmpbuf)
135 kfree(b->tmpbuf, M_DEVBUF);
136
137 if (b->shadbuf)
138 kfree(b->shadbuf, M_DEVBUF);
139
140 if (b->buf) {
141 if (b->flags & SNDBUF_F_MANAGED) {
142 if (b->buf_addr)
143 bus_dmamap_unload(b->dmatag, b->dmamap);
144 if (b->dmatag)
145 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
146 } else
147 kfree(b->buf, M_DEVBUF);
148 }
149
150 b->tmpbuf = NULL;
151 b->shadbuf = NULL;
152 b->buf = NULL;
153 b->sl = 0;
154 b->dmatag = NULL;
155 b->dmamap = NULL;
156 }
157
158 #define SNDBUF_CACHE_SHIFT 5
159
160 int
sndbuf_resize(struct snd_dbuf * b,unsigned int blkcnt,unsigned int blksz)161 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
162 {
163 unsigned int bufsize, allocsize;
164 u_int8_t *tmpbuf;
165
166 CHN_LOCK(b->channel);
167 if (b->maxsize == 0)
168 goto out;
169 if (blkcnt == 0)
170 blkcnt = b->blkcnt;
171 if (blksz == 0)
172 blksz = b->blksz;
173 if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz) > b->maxsize) {
174 CHN_UNLOCK(b->channel);
175 return EINVAL;
176 }
177 if (blkcnt == b->blkcnt && blksz == b->blksz)
178 goto out;
179
180 bufsize = blkcnt * blksz;
181
182 if (bufsize > b->allocsize ||
183 bufsize < (b->allocsize >> SNDBUF_CACHE_SHIFT)) {
184 allocsize = round_page(bufsize);
185 CHN_UNLOCK(b->channel);
186 tmpbuf = kmalloc(allocsize, M_DEVBUF, M_WAITOK);
187 CHN_LOCK(b->channel);
188 if (snd_verbose > 3)
189 kprintf("%s(): b=%p %p -> %p [%d -> %d : %d]\n",
190 __func__, b, b->tmpbuf, tmpbuf,
191 b->allocsize, allocsize, bufsize);
192 if (b->tmpbuf != NULL)
193 kfree(b->tmpbuf, M_DEVBUF);
194 b->tmpbuf = tmpbuf;
195 b->allocsize = allocsize;
196 } else if (snd_verbose > 3)
197 kprintf("%s(): b=%p %d [%d] NOCHANGE\n",
198 __func__, b, b->allocsize, b->bufsize);
199
200 b->blkcnt = blkcnt;
201 b->blksz = blksz;
202 b->bufsize = bufsize;
203
204 sndbuf_reset(b);
205 out:
206 CHN_UNLOCK(b->channel);
207 return 0;
208 }
209
210 int
sndbuf_remalloc(struct snd_dbuf * b,unsigned int blkcnt,unsigned int blksz)211 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
212 {
213 unsigned int bufsize, allocsize;
214 u_int8_t *buf, *tmpbuf, *shadbuf;
215
216 if (blkcnt < 2 || blksz < 16)
217 return EINVAL;
218
219 bufsize = blksz * blkcnt;
220
221 if (bufsize > b->allocsize ||
222 bufsize < (b->allocsize >> SNDBUF_CACHE_SHIFT)) {
223 allocsize = round_page(bufsize);
224 CHN_UNLOCK(b->channel);
225 buf = kmalloc(allocsize, M_DEVBUF, M_WAITOK);
226 tmpbuf = kmalloc(allocsize, M_DEVBUF, M_WAITOK);
227 shadbuf = kmalloc(allocsize, M_DEVBUF, M_WAITOK);
228 CHN_LOCK(b->channel);
229 if (b->buf != NULL)
230 kfree(b->buf, M_DEVBUF);
231 b->buf = buf;
232 if (b->tmpbuf != NULL)
233 kfree(b->tmpbuf, M_DEVBUF);
234 b->tmpbuf = tmpbuf;
235 if (b->shadbuf != NULL)
236 kfree(b->shadbuf, M_DEVBUF);
237 b->shadbuf = shadbuf;
238 if (snd_verbose > 3)
239 kprintf("%s(): b=%p %d -> %d [%d]\n",
240 __func__, b, b->allocsize, allocsize, bufsize);
241 b->allocsize = allocsize;
242 } else if (snd_verbose > 3)
243 kprintf("%s(): b=%p %d [%d] NOCHANGE\n",
244 __func__, b, b->allocsize, b->bufsize);
245
246 b->blkcnt = blkcnt;
247 b->blksz = blksz;
248 b->bufsize = bufsize;
249 b->maxsize = bufsize;
250 b->sl = bufsize;
251
252 sndbuf_reset(b);
253
254 return 0;
255 }
256
257 /**
258 * @brief Zero out space in buffer free area
259 *
260 * This function clears a chunk of @c length bytes in the buffer free area
261 * (i.e., where the next write will be placed).
262 *
263 * @param b buffer context
264 * @param length number of bytes to blank
265 */
266 void
sndbuf_clear(struct snd_dbuf * b,unsigned int length)267 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
268 {
269 int i;
270 u_char data, *p;
271
272 if (length == 0)
273 return;
274 if (length > b->bufsize)
275 length = b->bufsize;
276
277 data = sndbuf_zerodata(b->fmt);
278
279 i = sndbuf_getfreeptr(b);
280 p = sndbuf_getbuf(b);
281 while (length > 0) {
282 p[i] = data;
283 length--;
284 i++;
285 if (i >= b->bufsize)
286 i = 0;
287 }
288 }
289
290 /**
291 * @brief Zap buffer contents, resetting "ready area" fields
292 *
293 * @param b buffer context
294 */
295 void
sndbuf_fillsilence(struct snd_dbuf * b)296 sndbuf_fillsilence(struct snd_dbuf *b)
297 {
298 if (b->bufsize > 0)
299 memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
300 b->rp = 0;
301 b->rl = b->bufsize;
302 }
303
304 void
sndbuf_fillsilence_rl(struct snd_dbuf * b,u_int rl)305 sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl)
306 {
307 if (b->bufsize > 0)
308 memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
309 b->rp = 0;
310 b->rl = min(b->bufsize, rl);
311 }
312
313 /**
314 * @brief Reset buffer w/o flushing statistics
315 *
316 * This function just zeroes out buffer contents and sets the "ready length"
317 * to zero. This was originally to facilitate minimal playback interruption
318 * (i.e., dropped samples) in SNDCTL_DSP_SILENCE/SKIP ioctls.
319 *
320 * @param b buffer context
321 */
322 void
sndbuf_softreset(struct snd_dbuf * b)323 sndbuf_softreset(struct snd_dbuf *b)
324 {
325 b->rl = 0;
326 if (b->buf && b->bufsize > 0)
327 sndbuf_clear(b, b->bufsize);
328 }
329
330 void
sndbuf_reset(struct snd_dbuf * b)331 sndbuf_reset(struct snd_dbuf *b)
332 {
333 b->hp = 0;
334 b->rp = 0;
335 b->rl = 0;
336 b->dl = 0;
337 b->prev_total = 0;
338 b->total = 0;
339 b->xrun = 0;
340 if (b->buf && b->bufsize > 0)
341 sndbuf_clear(b, b->bufsize);
342 sndbuf_clearshadow(b);
343 }
344
345 u_int32_t
sndbuf_getfmt(struct snd_dbuf * b)346 sndbuf_getfmt(struct snd_dbuf *b)
347 {
348 return b->fmt;
349 }
350
351 int
sndbuf_setfmt(struct snd_dbuf * b,u_int32_t fmt)352 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
353 {
354 b->fmt = fmt;
355 b->bps = AFMT_BPS(b->fmt);
356 b->align = AFMT_ALIGN(b->fmt);
357 #if 0
358 b->bps = AFMT_CHANNEL(b->fmt);
359 if (b->fmt & AFMT_16BIT)
360 b->bps <<= 1;
361 else if (b->fmt & AFMT_24BIT)
362 b->bps *= 3;
363 else if (b->fmt & AFMT_32BIT)
364 b->bps <<= 2;
365 #endif
366 return 0;
367 }
368
369 unsigned int
sndbuf_getspd(struct snd_dbuf * b)370 sndbuf_getspd(struct snd_dbuf *b)
371 {
372 return b->spd;
373 }
374
375 void
sndbuf_setspd(struct snd_dbuf * b,unsigned int spd)376 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
377 {
378 b->spd = spd;
379 }
380
381 unsigned int
sndbuf_getalign(struct snd_dbuf * b)382 sndbuf_getalign(struct snd_dbuf *b)
383 {
384 return (b->align);
385 }
386
387 unsigned int
sndbuf_getblkcnt(struct snd_dbuf * b)388 sndbuf_getblkcnt(struct snd_dbuf *b)
389 {
390 return b->blkcnt;
391 }
392
393 void
sndbuf_setblkcnt(struct snd_dbuf * b,unsigned int blkcnt)394 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
395 {
396 b->blkcnt = blkcnt;
397 }
398
399 unsigned int
sndbuf_getblksz(struct snd_dbuf * b)400 sndbuf_getblksz(struct snd_dbuf *b)
401 {
402 return b->blksz;
403 }
404
405 void
sndbuf_setblksz(struct snd_dbuf * b,unsigned int blksz)406 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
407 {
408 b->blksz = blksz;
409 }
410
411 unsigned int
sndbuf_getbps(struct snd_dbuf * b)412 sndbuf_getbps(struct snd_dbuf *b)
413 {
414 return b->bps;
415 }
416
417 void *
sndbuf_getbuf(struct snd_dbuf * b)418 sndbuf_getbuf(struct snd_dbuf *b)
419 {
420 return b->buf;
421 }
422
423 void *
sndbuf_getbufofs(struct snd_dbuf * b,unsigned int ofs)424 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
425 {
426 KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
427
428 return b->buf + ofs;
429 }
430
431 unsigned int
sndbuf_getsize(struct snd_dbuf * b)432 sndbuf_getsize(struct snd_dbuf *b)
433 {
434 return b->bufsize;
435 }
436
437 unsigned int
sndbuf_getmaxsize(struct snd_dbuf * b)438 sndbuf_getmaxsize(struct snd_dbuf *b)
439 {
440 return b->maxsize;
441 }
442
443 unsigned int
sndbuf_getallocsize(struct snd_dbuf * b)444 sndbuf_getallocsize(struct snd_dbuf *b)
445 {
446 return b->allocsize;
447 }
448
449 unsigned int
sndbuf_runsz(struct snd_dbuf * b)450 sndbuf_runsz(struct snd_dbuf *b)
451 {
452 return b->dl;
453 }
454
455 void
sndbuf_setrun(struct snd_dbuf * b,int go)456 sndbuf_setrun(struct snd_dbuf *b, int go)
457 {
458 b->dl = go? b->blksz : 0;
459 }
460
461 struct kqinfo *
sndbuf_getkq(struct snd_dbuf * b)462 sndbuf_getkq(struct snd_dbuf *b)
463 {
464 return &b->kq;
465 }
466
467 /************************************************************/
468 unsigned int
sndbuf_getxrun(struct snd_dbuf * b)469 sndbuf_getxrun(struct snd_dbuf *b)
470 {
471 SNDBUF_LOCKASSERT(b);
472
473 return b->xrun;
474 }
475
476 void
sndbuf_setxrun(struct snd_dbuf * b,unsigned int xrun)477 sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun)
478 {
479 SNDBUF_LOCKASSERT(b);
480
481 b->xrun = xrun;
482 }
483
484 unsigned int
sndbuf_gethwptr(struct snd_dbuf * b)485 sndbuf_gethwptr(struct snd_dbuf *b)
486 {
487 SNDBUF_LOCKASSERT(b);
488
489 return b->hp;
490 }
491
492 void
sndbuf_sethwptr(struct snd_dbuf * b,unsigned int ptr)493 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
494 {
495 SNDBUF_LOCKASSERT(b);
496
497 b->hp = ptr;
498 }
499
500 unsigned int
sndbuf_getready(struct snd_dbuf * b)501 sndbuf_getready(struct snd_dbuf *b)
502 {
503 SNDBUF_LOCKASSERT(b);
504 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
505
506 return b->rl;
507 }
508
509 unsigned int
sndbuf_getreadyptr(struct snd_dbuf * b)510 sndbuf_getreadyptr(struct snd_dbuf *b)
511 {
512 SNDBUF_LOCKASSERT(b);
513 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
514
515 return b->rp;
516 }
517
518 unsigned int
sndbuf_getfree(struct snd_dbuf * b)519 sndbuf_getfree(struct snd_dbuf *b)
520 {
521 SNDBUF_LOCKASSERT(b);
522 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
523
524 return b->bufsize - b->rl;
525 }
526
527 unsigned int
sndbuf_getfreeptr(struct snd_dbuf * b)528 sndbuf_getfreeptr(struct snd_dbuf *b)
529 {
530 SNDBUF_LOCKASSERT(b);
531 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
532 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
533
534 return (b->rp + b->rl) % b->bufsize;
535 }
536
537 u_int64_t
sndbuf_getblocks(struct snd_dbuf * b)538 sndbuf_getblocks(struct snd_dbuf *b)
539 {
540 SNDBUF_LOCKASSERT(b);
541
542 return b->total / b->blksz;
543 }
544
545 u_int64_t
sndbuf_getprevblocks(struct snd_dbuf * b)546 sndbuf_getprevblocks(struct snd_dbuf *b)
547 {
548 SNDBUF_LOCKASSERT(b);
549
550 return b->prev_total / b->blksz;
551 }
552
553 u_int64_t
sndbuf_gettotal(struct snd_dbuf * b)554 sndbuf_gettotal(struct snd_dbuf *b)
555 {
556 SNDBUF_LOCKASSERT(b);
557
558 return b->total;
559 }
560
561 u_int64_t
sndbuf_getprevtotal(struct snd_dbuf * b)562 sndbuf_getprevtotal(struct snd_dbuf *b)
563 {
564 SNDBUF_LOCKASSERT(b);
565
566 return b->prev_total;
567 }
568
569 void
sndbuf_updateprevtotal(struct snd_dbuf * b)570 sndbuf_updateprevtotal(struct snd_dbuf *b)
571 {
572 SNDBUF_LOCKASSERT(b);
573
574 b->prev_total = b->total;
575 }
576
577 unsigned int
sndbuf_xbytes(unsigned int v,struct snd_dbuf * from,struct snd_dbuf * to)578 sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to)
579 {
580 if (from == NULL || to == NULL || v == 0)
581 return 0;
582
583 return snd_xbytes(v, sndbuf_getalign(from) * sndbuf_getspd(from),
584 sndbuf_getalign(to) * sndbuf_getspd(to));
585 }
586
587 u_int8_t
sndbuf_zerodata(u_int32_t fmt)588 sndbuf_zerodata(u_int32_t fmt)
589 {
590 if (fmt & (AFMT_SIGNED | AFMT_PASSTHROUGH))
591 return (0x00);
592 else if (fmt & AFMT_MU_LAW)
593 return (0x7f);
594 else if (fmt & AFMT_A_LAW)
595 return (0x55);
596 return (0x80);
597 }
598
599 /************************************************************/
600
601 /**
602 * @brief Acquire buffer space to extend ready area
603 *
604 * This function extends the ready area length by @c count bytes, and may
605 * optionally copy samples from another location stored in @c from. The
606 * counter @c snd_dbuf::total is also incremented by @c count bytes.
607 *
608 * @param b audio buffer
609 * @param from sample source (optional)
610 * @param count number of bytes to acquire
611 *
612 * @retval 0 Unconditional
613 */
614 int
sndbuf_acquire(struct snd_dbuf * b,u_int8_t * from,unsigned int count)615 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
616 {
617 int l;
618
619 KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b)));
620 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
621 b->total += count;
622 if (from != NULL) {
623 while (count > 0) {
624 l = min(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
625 bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
626 from += l;
627 b->rl += l;
628 count -= l;
629 }
630 } else
631 b->rl += count;
632 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
633
634 return 0;
635 }
636
637 /**
638 * @brief Dispose samples from channel buffer, increasing size of ready area
639 *
640 * This function discards samples from the supplied buffer by advancing the
641 * ready area start pointer and decrementing the ready area length. If
642 * @c to is not NULL, then the discard samples will be copied to the location
643 * it points to.
644 *
645 * @param b PCM channel sound buffer
646 * @param to destination buffer (optional)
647 * @param count number of bytes to discard
648 *
649 * @returns 0 unconditionally
650 */
651 int
sndbuf_dispose(struct snd_dbuf * b,u_int8_t * to,unsigned int count)652 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
653 {
654 int l;
655
656 KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
657 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
658 if (to != NULL) {
659 while (count > 0) {
660 l = min(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
661 bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
662 to += l;
663 b->rl -= l;
664 b->rp = (b->rp + l) % b->bufsize;
665 count -= l;
666 }
667 } else {
668 b->rl -= count;
669 b->rp = (b->rp + count) % b->bufsize;
670 }
671 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
672
673 return 0;
674 }
675
676 #ifdef SND_DIAGNOSTIC
677 static uint32_t snd_feeder_maxfeed = 0;
678 SYSCTL_UINT(_hw_snd, OID_AUTO, feeder_maxfeed, CTLFLAG_RD,
679 &snd_feeder_maxfeed, 0, "maximum feeder count request");
680
681 static uint32_t snd_feeder_maxcycle = 0;
682 SYSCTL_UINT(_hw_snd, OID_AUTO, feeder_maxcycle, CTLFLAG_RD,
683 &snd_feeder_maxcycle, 0, "maximum feeder cycle");
684 #endif
685
686 /* count is number of bytes we want added to destination buffer */
687 int
sndbuf_feed(struct snd_dbuf * from,struct snd_dbuf * to,struct pcm_channel * channel,struct pcm_feeder * feeder,unsigned int count)688 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
689 {
690 unsigned int cnt, maxfeed;
691 #ifdef SND_DIAGNOSTIC
692 unsigned int cycle;
693
694 if (count > snd_feeder_maxfeed)
695 snd_feeder_maxfeed = count;
696
697 cycle = 0;
698 #endif
699
700 KASSERT(count > 0, ("can't feed 0 bytes"));
701
702 if (sndbuf_getfree(to) < count)
703 return (EINVAL);
704
705 maxfeed = SND_FXROUND(SND_FXDIV_MAX, sndbuf_getalign(to));
706
707 do {
708 cnt = FEEDER_FEED(feeder, channel, to->tmpbuf,
709 min(count, maxfeed), from);
710 if (cnt == 0)
711 break;
712 sndbuf_acquire(to, to->tmpbuf, cnt);
713 count -= cnt;
714 #ifdef SND_DIAGNOSTIC
715 cycle++;
716 #endif
717 } while (count != 0);
718
719 #ifdef SND_DIAGNOSTIC
720 if (cycle > snd_feeder_maxcycle)
721 snd_feeder_maxcycle = cycle;
722 #endif
723
724 return (0);
725 }
726
727 /************************************************************/
728
729 void
sndbuf_dump(struct snd_dbuf * b,char * s,u_int32_t what)730 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
731 {
732 kprintf("%s: [", s);
733 if (what & 0x01)
734 kprintf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
735 if (what & 0x02)
736 kprintf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
737 if (what & 0x04)
738 kprintf(" total: %ju, prev_total: %ju, xrun: %d", (uintmax_t)b->total, (uintmax_t)b->prev_total, b->xrun);
739 if (what & 0x08)
740 kprintf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
741 if (what & 0x10)
742 kprintf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
743 kprintf(" ]\n");
744 }
745
746 /************************************************************/
747 u_int32_t
sndbuf_getflags(struct snd_dbuf * b)748 sndbuf_getflags(struct snd_dbuf *b)
749 {
750 return b->flags;
751 }
752
753 void
sndbuf_setflags(struct snd_dbuf * b,u_int32_t flags,int on)754 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
755 {
756 b->flags &= ~flags;
757 if (on)
758 b->flags |= flags;
759 }
760
761 /**
762 * @brief Clear the shadow buffer by filling with samples equal to zero.
763 *
764 * @param b buffer to clear
765 */
766 void
sndbuf_clearshadow(struct snd_dbuf * b)767 sndbuf_clearshadow(struct snd_dbuf *b)
768 {
769 KASSERT(b != NULL, ("b is a null pointer"));
770 KASSERT(b->sl >= 0, ("illegal shadow length"));
771
772 if ((b->shadbuf != NULL) && (b->sl > 0))
773 memset(b->shadbuf, sndbuf_zerodata(b->fmt), b->sl);
774 }
775
776 #ifdef OSSV4_EXPERIMENT
777 /**
778 * @brief Return peak value from samples in buffer ready area.
779 *
780 * Peak ranges from 0-32767. If channel is monaural, most significant 16
781 * bits will be zero. For now, only expects to work with 1-2 channel
782 * buffers.
783 *
784 * @note Currently only operates with linear PCM formats.
785 *
786 * @param b buffer to analyze
787 * @param lpeak pointer to store left peak value
788 * @param rpeak pointer to store right peak value
789 */
790 void
sndbuf_getpeaks(struct snd_dbuf * b,int * lp,int * rp)791 sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp)
792 {
793 u_int32_t lpeak, rpeak;
794
795 lpeak = 0;
796 rpeak = 0;
797
798 /**
799 * @todo fill this in later
800 */
801 }
802 #endif
803