1 /*-
2 * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/dev/sound/pcm/buffer.c,v 1.25.2.3 2007/04/26 08:21:43 ariff Exp $
27 */
28
29 #include <dev/sound/pcm/sound.h>
30
31 #include "feeder_if.h"
32
33 SND_DECLARE_FILE("$DragonFly: src/sys/dev/sound/pcm/buffer.c,v 1.11 2008/01/06 16:55:51 swildner Exp $");
34
35 /*
36 * XXX
37 *
38 * sndbuf_kqtask is a taskqueue callback routine, called from
39 * taskqueue_swi, which runs under the MP lock.
40 *
41 * The only purpose is to be able to KNOTE() from a sound
42 * interrupt, which is running without MP lock held and thus
43 * can't call KNOTE() directly.
44 */
45 static void
46 sndbuf_kqtask(void *context, int pending)
47 {
48 struct snd_dbuf *b = context;
49 struct kqinfo *ki = sndbuf_getkq(b);
50
51 KNOTE(&ki->ki_note, 0);
52 }
53
54 struct snd_dbuf *
55 sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel)
56 {
57 struct snd_dbuf *b;
58
59 b = kmalloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
60 ksnprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
61 b->dev = dev;
62 b->channel = channel;
63 TASK_INIT(&b->kqtask, 0, sndbuf_kqtask, b);
64
65 return b;
66 }
67
68 void
69 sndbuf_destroy(struct snd_dbuf *b)
70 {
71 sndbuf_free(b);
72 kfree(b, M_DEVBUF);
73 }
74
75 bus_addr_t
76 sndbuf_getbufaddr(struct snd_dbuf *buf)
77 {
78 return (buf->buf_addr);
79 }
80
81 static void
82 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
83 {
84 struct snd_dbuf *b = (struct snd_dbuf *)arg;
85
86 if (bootverbose) {
87 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
88 (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
89 kprintf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
90 }
91 if (error == 0)
92 b->buf_addr = segs[0].ds_addr;
93 else
94 b->buf_addr = 0;
95 }
96
97 /*
98 * Allocate memory for DMA buffer. If the device does not use DMA transfers,
99 * the driver can call kmalloc(9) and sndbuf_setup() itself.
100 */
101
102 int
103 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
104 {
105 int ret;
106
107 b->dmatag = dmatag;
108 b->maxsize = size;
109 b->bufsize = b->maxsize;
110 b->buf_addr = 0;
111 b->flags |= SNDBUF_F_MANAGED;
112 if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT,
113 &b->dmamap)) {
114 sndbuf_free(b);
115 return (ENOMEM);
116 }
117 if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
118 sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
119 sndbuf_free(b);
120 return (ENOMEM);
121 }
122
123 ret = sndbuf_resize(b, 2, b->maxsize / 2);
124 if (ret != 0)
125 sndbuf_free(b);
126
127 return (ret);
128 }
129
130 int
131 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
132 {
133 b->flags &= ~SNDBUF_F_MANAGED;
134 if (buf)
135 b->flags |= SNDBUF_F_MANAGED;
136 b->buf = buf;
137 b->maxsize = size;
138 b->bufsize = b->maxsize;
139 return sndbuf_resize(b, 2, b->maxsize / 2);
140 }
141
142 void
143 sndbuf_free(struct snd_dbuf *b)
144 {
145 if (b->tmpbuf)
146 kfree(b->tmpbuf, M_DEVBUF);
147 if (b->buf) {
148 if (b->flags & SNDBUF_F_MANAGED) {
149 if (b->dmamap)
150 bus_dmamap_unload(b->dmatag, b->dmamap);
151 if (b->dmatag)
152 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
153 } else
154 kfree(b->buf, M_DEVBUF);
155 }
156
157 b->tmpbuf = NULL;
158 b->buf = NULL;
159 b->dmatag = NULL;
160 b->dmamap = NULL;
161 }
162
163 int
164 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
165 {
166 u_int8_t *tmpbuf, *f2;
167
168 chn_lock(b->channel);
169 if (b->maxsize == 0)
170 goto out;
171 if (blkcnt == 0)
172 blkcnt = b->blkcnt;
173 if (blksz == 0)
174 blksz = b->blksz;
175 if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) {
176 chn_unlock(b->channel);
177 return EINVAL;
178 }
179 if (blkcnt == b->blkcnt && blksz == b->blksz)
180 goto out;
181
182 chn_unlock(b->channel);
183 tmpbuf = kmalloc(blkcnt * blksz, M_DEVBUF, M_WAITOK);
184 chn_lock(b->channel);
185 b->blkcnt = blkcnt;
186 b->blksz = blksz;
187 b->bufsize = blkcnt * blksz;
188 f2 = b->tmpbuf;
189 b->tmpbuf = tmpbuf;
190 sndbuf_reset(b);
191 chn_unlock(b->channel);
192 if (f2 != NULL)
193 kfree(f2, M_DEVBUF);
194 return 0;
195 out:
196 chn_unlock(b->channel);
197 return 0;
198 }
199
200 int
201 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
202 {
203 u_int8_t *buf, *tmpbuf, *f1, *f2;
204 unsigned int bufsize;
205 int ret;
206
207 if (blkcnt < 2 || blksz < 16)
208 return EINVAL;
209
210 bufsize = blksz * blkcnt;
211
212 chn_unlock(b->channel);
213 buf = kmalloc(bufsize, M_DEVBUF, M_WAITOK);
214 tmpbuf = kmalloc(bufsize, M_DEVBUF, M_WAITOK);
215 chn_lock(b->channel);
216
217 b->blkcnt = blkcnt;
218 b->blksz = blksz;
219 b->bufsize = bufsize;
220 b->maxsize = bufsize;
221 f1 = b->buf;
222 f2 = b->tmpbuf;
223 b->buf = buf;
224 b->tmpbuf = tmpbuf;
225
226 sndbuf_reset(b);
227
228 chn_unlock(b->channel);
229 if (f1)
230 kfree(f1, M_DEVBUF);
231 if (f2)
232 kfree(f2, M_DEVBUF);
233
234 ret = 0;
235 chn_lock(b->channel);
236 return ret;
237 }
238
239 void
240 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
241 {
242 int i;
243 u_char data, *p;
244
245 if (length == 0)
246 return;
247 if (length > b->bufsize)
248 length = b->bufsize;
249
250 if (b->fmt & AFMT_SIGNED)
251 data = 0x00;
252 else
253 data = 0x80;
254
255 i = sndbuf_getfreeptr(b);
256 p = sndbuf_getbuf(b);
257 while (length > 0) {
258 p[i] = data;
259 length--;
260 i++;
261 if (i >= b->bufsize)
262 i = 0;
263 }
264 }
265
266 void
267 sndbuf_fillsilence(struct snd_dbuf *b)
268 {
269 int i;
270 u_char data, *p;
271
272 if (b->fmt & AFMT_SIGNED)
273 data = 0x00;
274 else
275 data = 0x80;
276
277 i = 0;
278 p = sndbuf_getbuf(b);
279 while (i < b->bufsize)
280 p[i++] = data;
281 b->rp = 0;
282 b->rl = b->bufsize;
283 }
284
285 void
286 sndbuf_reset(struct snd_dbuf *b)
287 {
288 b->hp = 0;
289 b->rp = 0;
290 b->rl = 0;
291 b->dl = 0;
292 b->prev_total = 0;
293 b->total = 0;
294 b->xrun = 0;
295 if (b->buf && b->bufsize > 0)
296 sndbuf_clear(b, b->bufsize);
297 }
298
299 u_int32_t
300 sndbuf_getfmt(struct snd_dbuf *b)
301 {
302 return b->fmt;
303 }
304
305 int
306 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
307 {
308 b->fmt = fmt;
309 b->bps = 1;
310 b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0;
311 if (b->fmt & AFMT_16BIT)
312 b->bps <<= 1;
313 else if (b->fmt & AFMT_24BIT)
314 b->bps *= 3;
315 else if (b->fmt & AFMT_32BIT)
316 b->bps <<= 2;
317 return 0;
318 }
319
320 unsigned int
321 sndbuf_getspd(struct snd_dbuf *b)
322 {
323 return b->spd;
324 }
325
326 void
327 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
328 {
329 b->spd = spd;
330 }
331
332 unsigned int
333 sndbuf_getalign(struct snd_dbuf *b)
334 {
335 static int align[] = {0, 1, 1, 2, 2, 2, 2, 3};
336
337 return align[b->bps - 1];
338 }
339
340 unsigned int
341 sndbuf_getblkcnt(struct snd_dbuf *b)
342 {
343 return b->blkcnt;
344 }
345
346 void
347 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
348 {
349 b->blkcnt = blkcnt;
350 }
351
352 unsigned int
353 sndbuf_getblksz(struct snd_dbuf *b)
354 {
355 return b->blksz;
356 }
357
358 void
359 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
360 {
361 b->blksz = blksz;
362 }
363
364 unsigned int
365 sndbuf_getbps(struct snd_dbuf *b)
366 {
367 return b->bps;
368 }
369
370 void *
371 sndbuf_getbuf(struct snd_dbuf *b)
372 {
373 return b->buf;
374 }
375
376 void *
377 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
378 {
379 KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
380
381 return b->buf + ofs;
382 }
383
384 unsigned int
385 sndbuf_getsize(struct snd_dbuf *b)
386 {
387 return b->bufsize;
388 }
389
390 unsigned int
391 sndbuf_getmaxsize(struct snd_dbuf *b)
392 {
393 return b->maxsize;
394 }
395
396 unsigned int
397 sndbuf_runsz(struct snd_dbuf *b)
398 {
399 return b->dl;
400 }
401
402 void
403 sndbuf_setrun(struct snd_dbuf *b, int go)
404 {
405 b->dl = go? b->blksz : 0;
406 }
407
408 struct kqinfo *
409 sndbuf_getkq(struct snd_dbuf *b)
410 {
411 return &b->kq;
412 }
413
414 /************************************************************/
415 unsigned int
416 sndbuf_getxrun(struct snd_dbuf *b)
417 {
418 SNDBUF_LOCKASSERT(b);
419
420 return b->xrun;
421 }
422
423 void
424 sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt)
425 {
426 SNDBUF_LOCKASSERT(b);
427
428 b->xrun = cnt;
429 }
430
431 unsigned int
432 sndbuf_gethwptr(struct snd_dbuf *b)
433 {
434 SNDBUF_LOCKASSERT(b);
435
436 return b->hp;
437 }
438
439 void
440 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
441 {
442 SNDBUF_LOCKASSERT(b);
443
444 b->hp = ptr;
445 }
446
447 unsigned int
448 sndbuf_getready(struct snd_dbuf *b)
449 {
450 SNDBUF_LOCKASSERT(b);
451 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
452
453 return b->rl;
454 }
455
456 unsigned int
457 sndbuf_getreadyptr(struct snd_dbuf *b)
458 {
459 SNDBUF_LOCKASSERT(b);
460 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
461
462 return b->rp;
463 }
464
465 unsigned int
466 sndbuf_getfree(struct snd_dbuf *b)
467 {
468 SNDBUF_LOCKASSERT(b);
469 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
470
471 return b->bufsize - b->rl;
472 }
473
474 unsigned int
475 sndbuf_getfreeptr(struct snd_dbuf *b)
476 {
477 SNDBUF_LOCKASSERT(b);
478 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
479 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
480
481 return (b->rp + b->rl) % b->bufsize;
482 }
483
484 unsigned int
485 sndbuf_getblocks(struct snd_dbuf *b)
486 {
487 SNDBUF_LOCKASSERT(b);
488
489 return b->total / b->blksz;
490 }
491
492 unsigned int
493 sndbuf_getprevblocks(struct snd_dbuf *b)
494 {
495 SNDBUF_LOCKASSERT(b);
496
497 return b->prev_total / b->blksz;
498 }
499
500 unsigned int
501 sndbuf_gettotal(struct snd_dbuf *b)
502 {
503 SNDBUF_LOCKASSERT(b);
504
505 return b->total;
506 }
507
508 void
509 sndbuf_updateprevtotal(struct snd_dbuf *b)
510 {
511 SNDBUF_LOCKASSERT(b);
512
513 b->prev_total = b->total;
514 }
515
516 /************************************************************/
517
518 int
519 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
520 {
521 int l;
522
523 KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > kfree %d", __func__, count, sndbuf_getfree(b)));
524 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
525 b->total += count;
526 if (from != NULL) {
527 while (count > 0) {
528 l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
529 bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
530 from += l;
531 b->rl += l;
532 count -= l;
533 }
534 } else
535 b->rl += count;
536 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
537
538 return 0;
539 }
540
541 int
542 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
543 {
544 int l;
545
546 KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
547 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
548 if (to != NULL) {
549 while (count > 0) {
550 l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
551 bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
552 to += l;
553 b->rl -= l;
554 b->rp = (b->rp + l) % b->bufsize;
555 count -= l;
556 }
557 } else {
558 b->rl -= count;
559 b->rp = (b->rp + count) % b->bufsize;
560 }
561 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
562
563 return 0;
564 }
565
566 /* count is number of bytes we want added to destination buffer */
567 int
568 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
569 {
570 KASSERT(count > 0, ("can't feed 0 bytes"));
571
572 if (sndbuf_getfree(to) < count)
573 return EINVAL;
574
575 count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from);
576 if (count)
577 sndbuf_acquire(to, to->tmpbuf, count);
578 /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */
579
580 return 0;
581 }
582
583 /************************************************************/
584
585 void
586 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
587 {
588 kprintf("%s: [", s);
589 if (what & 0x01)
590 kprintf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
591 if (what & 0x02)
592 kprintf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
593 if (what & 0x04)
594 kprintf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun);
595 if (what & 0x08)
596 kprintf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
597 if (what & 0x10)
598 kprintf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
599 kprintf(" ]\n");
600 }
601
602 /************************************************************/
603 u_int32_t
604 sndbuf_getflags(struct snd_dbuf *b)
605 {
606 return b->flags;
607 }
608
609 void
610 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
611 {
612 b->flags &= ~flags;
613 if (on)
614 b->flags |= flags;
615 }
Cache object: a3ff19cf20a17eedcf23214c31317b51
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