buffer.c revision 111183
1/* 2 * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk> 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 27#include <dev/sound/pcm/sound.h> 28 29#include "feeder_if.h" 30 31SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pcm/buffer.c 111183 2003-02-20 17:31:12Z cognet $"); 32 33struct snd_dbuf * 34sndbuf_create(device_t dev, char *drv, char *desc) 35{ 36 struct snd_dbuf *b; 37 38 b = malloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO); 39 snprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc); 40 b->dev = dev; 41 42 return b; 43} 44 45void 46sndbuf_destroy(struct snd_dbuf *b) 47{ 48 free(b, M_DEVBUF); 49} 50 51bus_addr_t 52sndbuf_getbufaddr(struct snd_dbuf *buf) 53{ 54 return (buf->buf_addr); 55} 56 57static void 58sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error) 59{ 60 struct snd_dbuf *b = (struct snd_dbuf *)arg; 61 62 if (bootverbose) { 63 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ", (unsigned long)segs->ds_addr, 64 (unsigned long)segs->ds_len); 65 printf("%p -> %lx\n", b->buf, (unsigned long)vtophys(b->buf)); 66 } 67 b->buf_addr = segs->ds_addr; 68} 69 70/* 71 * Allocate memory for DMA buffer. If the device does not use DMA transfers, 72 * the driver can call malloc(9) and sndbuf_setup() itself. 73 */ 74 75int 76sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size) 77{ 78 b->dmatag = dmatag; 79 b->maxsize = size; 80 b->bufsize = b->maxsize; 81 if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT, &b->dmamap)) 82 return ENOSPC; 83 if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize, sndbuf_setmap, b, 0)) 84 return ENOSPC; 85 return sndbuf_resize(b, 2, b->maxsize / 2); 86} 87 88int 89sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size) 90{ 91 b->buf = buf; 92 b->maxsize = size; 93 b->bufsize = b->maxsize; 94 return sndbuf_resize(b, 2, b->maxsize / 2); 95} 96 97void 98sndbuf_free(struct snd_dbuf *b) 99{ 100 if (b->tmpbuf) 101 free(b->tmpbuf, M_DEVBUF); 102 b->tmpbuf = NULL; 103 104 if (b->dmamap) 105 bus_dmamap_unload(b->dmatag, b->dmamap); 106 107 if (b->dmamap && b->buf) 108 bus_dmamem_free(b->dmatag, b->buf, b->dmamap); 109 b->dmamap = NULL; 110 b->buf = NULL; 111} 112 113int 114sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz) 115{ 116 if (b->maxsize == 0) 117 return 0; 118 if (blkcnt == 0) 119 blkcnt = b->blkcnt; 120 if (blksz == 0) 121 blksz = b->blksz; 122 if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) 123 return EINVAL; 124 if (blkcnt == b->blkcnt && blksz == b->blksz) 125 return 0; 126 b->blkcnt = blkcnt; 127 b->blksz = blksz; 128 b->bufsize = blkcnt * blksz; 129 if (b->tmpbuf) 130 free(b->tmpbuf, M_DEVBUF); 131 b->tmpbuf = malloc(b->bufsize, M_DEVBUF, M_NOWAIT); 132 sndbuf_reset(b); 133 return 0; 134} 135 136int 137sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz) 138{ 139 u_int8_t *buf, *tmpbuf, *f1, *f2; 140 unsigned int bufsize; 141 142 if (blkcnt < 2 || blksz < 16) 143 return EINVAL; 144 145 bufsize = blksz * blkcnt; 146 147 148 buf = malloc(bufsize, M_DEVBUF, M_NOWAIT); 149 if (buf == NULL) 150 return ENOMEM; 151 152 tmpbuf = malloc(bufsize, M_DEVBUF, M_NOWAIT); 153 if (tmpbuf == NULL) { 154 free(buf, M_DEVBUF); 155 return ENOMEM; 156 } 157 158 b->blkcnt = blkcnt; 159 b->blksz = blksz; 160 b->bufsize = bufsize; 161 b->maxsize = bufsize; 162 f1 = b->buf; 163 f2 = b->tmpbuf; 164 b->buf = buf; 165 b->tmpbuf = tmpbuf; 166 167 if (f1) 168 free(f1, M_DEVBUF); 169 if (f2) 170 free(f2, M_DEVBUF); 171 172 sndbuf_reset(b); 173 return 0; 174} 175 176void 177sndbuf_clear(struct snd_dbuf *b, unsigned int length) 178{ 179 int i; 180 u_char data, *p; 181 182 if (length == 0) 183 return; 184 if (length > b->bufsize) 185 length = b->bufsize; 186 187 if (b->fmt & AFMT_SIGNED) 188 data = 0x00; 189 else 190 data = 0x80; 191 192 i = sndbuf_getfreeptr(b); 193 p = sndbuf_getbuf(b); 194 while (length > 0) { 195 p[i] = data; 196 length--; 197 i++; 198 if (i >= b->bufsize) 199 i = 0; 200 } 201} 202 203void 204sndbuf_fillsilence(struct snd_dbuf *b) 205{ 206 int i; 207 u_char data, *p; 208 209 if (b->fmt & AFMT_SIGNED) 210 data = 0x00; 211 else 212 data = 0x80; 213 214 i = 0; 215 p = sndbuf_getbuf(b); 216 while (i < b->bufsize) 217 p[i++] = data; 218 b->rp = 0; 219 b->rl = b->bufsize; 220} 221 222void 223sndbuf_reset(struct snd_dbuf *b) 224{ 225 b->hp = 0; 226 b->rp = 0; 227 b->rl = 0; 228 b->dl = 0; 229 b->prev_total = 0; 230 b->total = 0; 231 b->xrun = 0; 232 if (b->buf && b->bufsize > 0) 233 sndbuf_clear(b, b->bufsize); 234} 235 236u_int32_t 237sndbuf_getfmt(struct snd_dbuf *b) 238{ 239 return b->fmt; 240} 241 242int 243sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt) 244{ 245 b->fmt = fmt; 246 b->bps = 1; 247 b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0; 248 b->bps <<= (b->fmt & AFMT_16BIT)? 1 : 0; 249 b->bps <<= (b->fmt & AFMT_32BIT)? 2 : 0; 250 return 0; 251} 252 253unsigned int 254sndbuf_getspd(struct snd_dbuf *b) 255{ 256 return b->spd; 257} 258 259void 260sndbuf_setspd(struct snd_dbuf *b, unsigned int spd) 261{ 262 b->spd = spd; 263} 264 265unsigned int 266sndbuf_getalign(struct snd_dbuf *b) 267{ 268 static int align[] = {0, 1, 1, 2, 2, 2, 2, 3}; 269 270 return align[b->bps - 1]; 271} 272 273unsigned int 274sndbuf_getblkcnt(struct snd_dbuf *b) 275{ 276 return b->blkcnt; 277} 278 279void 280sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt) 281{ 282 b->blkcnt = blkcnt; 283} 284 285unsigned int 286sndbuf_getblksz(struct snd_dbuf *b) 287{ 288 return b->blksz; 289} 290 291void 292sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz) 293{ 294 b->blksz = blksz; 295} 296 297unsigned int 298sndbuf_getbps(struct snd_dbuf *b) 299{ 300 return b->bps; 301} 302 303void * 304sndbuf_getbuf(struct snd_dbuf *b) 305{ 306 return b->buf; 307} 308 309void * 310sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs) 311{ 312 KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs)); 313 314 return b->buf + ofs; 315} 316 317unsigned int 318sndbuf_getsize(struct snd_dbuf *b) 319{ 320 return b->bufsize; 321} 322 323unsigned int 324sndbuf_getmaxsize(struct snd_dbuf *b) 325{ 326 return b->maxsize; 327} 328 329unsigned int 330sndbuf_runsz(struct snd_dbuf *b) 331{ 332 return b->dl; 333} 334 335void 336sndbuf_setrun(struct snd_dbuf *b, int go) 337{ 338 b->dl = go? b->blksz : 0; 339} 340 341struct selinfo * 342sndbuf_getsel(struct snd_dbuf *b) 343{ 344 return &b->sel; 345} 346 347/************************************************************/ 348unsigned int 349sndbuf_getxrun(struct snd_dbuf *b) 350{ 351 SNDBUF_LOCKASSERT(b); 352 353 return b->xrun; 354} 355 356void 357sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt) 358{ 359 SNDBUF_LOCKASSERT(b); 360 361 b->xrun = cnt; 362} 363 364unsigned int 365sndbuf_gethwptr(struct snd_dbuf *b) 366{ 367 SNDBUF_LOCKASSERT(b); 368 369 return b->hp; 370} 371 372void 373sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr) 374{ 375 SNDBUF_LOCKASSERT(b); 376 377 b->hp = ptr; 378} 379 380unsigned int 381sndbuf_getready(struct snd_dbuf *b) 382{ 383 SNDBUF_LOCKASSERT(b); 384 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 385 386 return b->rl; 387} 388 389unsigned int 390sndbuf_getreadyptr(struct snd_dbuf *b) 391{ 392 SNDBUF_LOCKASSERT(b); 393 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp)); 394 395 return b->rp; 396} 397 398unsigned int 399sndbuf_getfree(struct snd_dbuf *b) 400{ 401 SNDBUF_LOCKASSERT(b); 402 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 403 404 return b->bufsize - b->rl; 405} 406 407unsigned int 408sndbuf_getfreeptr(struct snd_dbuf *b) 409{ 410 SNDBUF_LOCKASSERT(b); 411 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp)); 412 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 413 414 return (b->rp + b->rl) % b->bufsize; 415} 416 417unsigned int 418sndbuf_getblocks(struct snd_dbuf *b) 419{ 420 SNDBUF_LOCKASSERT(b); 421 422 return b->total / b->blksz; 423} 424 425unsigned int 426sndbuf_getprevblocks(struct snd_dbuf *b) 427{ 428 SNDBUF_LOCKASSERT(b); 429 430 return b->prev_total / b->blksz; 431} 432 433unsigned int 434sndbuf_gettotal(struct snd_dbuf *b) 435{ 436 SNDBUF_LOCKASSERT(b); 437 438 return b->total; 439} 440 441void 442sndbuf_updateprevtotal(struct snd_dbuf *b) 443{ 444 SNDBUF_LOCKASSERT(b); 445 446 b->prev_total = b->total; 447} 448 449/************************************************************/ 450 451int 452sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count) 453{ 454 int l; 455 456 KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b))); 457 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 458 b->total += count; 459 if (from != NULL) { 460 while (count > 0) { 461 l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b)); 462 bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l); 463 from += l; 464 b->rl += l; 465 count -= l; 466 } 467 } else 468 b->rl += count; 469 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count)); 470 471 return 0; 472} 473 474int 475sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count) 476{ 477 int l; 478 479 KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b))); 480 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 481 if (to != NULL) { 482 while (count > 0) { 483 l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b)); 484 bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l); 485 to += l; 486 b->rl -= l; 487 b->rp = (b->rp + l) % b->bufsize; 488 count -= l; 489 } 490 } else { 491 b->rl -= count; 492 b->rp = (b->rp + count) % b->bufsize; 493 } 494 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count)); 495 496 return 0; 497} 498 499int 500sndbuf_uiomove(struct snd_dbuf *b, struct uio *uio, unsigned int count) 501{ 502 int x, c, p, rd, err; 503 504 err = 0; 505 rd = (uio->uio_rw == UIO_READ)? 1 : 0; 506 if (count > uio->uio_resid) 507 return EINVAL; 508 509 if (count > (rd? sndbuf_getready(b) : sndbuf_getfree(b))) { 510 return EINVAL; 511 } 512 513 while (err == 0 && count > 0) { 514 p = rd? sndbuf_getreadyptr(b) : sndbuf_getfreeptr(b); 515 c = MIN(count, sndbuf_getsize(b) - p); 516 x = uio->uio_resid; 517 err = uiomove(sndbuf_getbufofs(b, p), c, uio); 518 x -= uio->uio_resid; 519 count -= x; 520 x = rd? sndbuf_dispose(b, NULL, x) : sndbuf_acquire(b, NULL, x); 521 } 522 523 return 0; 524} 525 526/* count is number of bytes we want added to destination buffer */ 527int 528sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count) 529{ 530 KASSERT(count > 0, ("can't feed 0 bytes")); 531 532 if (sndbuf_getfree(to) < count) 533 return EINVAL; 534 535 count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from); 536 if (count) 537 sndbuf_acquire(to, to->tmpbuf, count); 538 /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */ 539 540 return 0; 541} 542 543/************************************************************/ 544 545void 546sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what) 547{ 548 printf("%s: [", s); 549 if (what & 0x01) 550 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize); 551 if (what & 0x02) 552 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp); 553 if (what & 0x04) 554 printf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun); 555 if (what & 0x08) 556 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd); 557 if (what & 0x10) 558 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags); 559 printf(" ]\n"); 560} 561 562/************************************************************/ 563u_int32_t 564sndbuf_getflags(struct snd_dbuf *b) 565{ 566 return b->flags; 567} 568 569void 570sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on) 571{ 572 b->flags &= ~flags; 573 if (on) 574 b->flags |= flags; 575} 576 577