buffer.c revision 128730
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 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 128730 2004-04-29 02:51:59Z green $"); 32 33struct snd_dbuf * 34sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel) 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 b->channel = channel; 42 43 return b; 44} 45 46void 47sndbuf_destroy(struct snd_dbuf *b) 48{ 49 free(b, M_DEVBUF); 50} 51 52bus_addr_t 53sndbuf_getbufaddr(struct snd_dbuf *buf) 54{ 55 return (buf->buf_addr); 56} 57 58static void 59sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error) 60{ 61 struct snd_dbuf *b = (struct snd_dbuf *)arg; 62 63 if (bootverbose) { 64 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ", (unsigned long)segs->ds_addr, 65 (unsigned long)segs->ds_len); 66 printf("%p -> %lx\n", b->buf, (unsigned long)vtophys(b->buf)); 67 } 68 b->buf_addr = segs->ds_addr; 69} 70 71/* 72 * Allocate memory for DMA buffer. If the device does not use DMA transfers, 73 * the driver can call malloc(9) and sndbuf_setup() itself. 74 */ 75 76int 77sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size) 78{ 79 b->dmatag = dmatag; 80 b->maxsize = size; 81 b->bufsize = b->maxsize; 82 if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT, &b->dmamap)) 83 return ENOSPC; 84 if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize, sndbuf_setmap, b, 0)) 85 return ENOSPC; 86 return sndbuf_resize(b, 2, b->maxsize / 2); 87} 88 89int 90sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size) 91{ 92 b->buf = buf; 93 b->maxsize = size; 94 b->bufsize = b->maxsize; 95 return sndbuf_resize(b, 2, b->maxsize / 2); 96} 97 98void 99sndbuf_free(struct snd_dbuf *b) 100{ 101 if (b->tmpbuf) 102 free(b->tmpbuf, M_DEVBUF); 103 b->tmpbuf = NULL; 104 105 if (b->dmamap) 106 bus_dmamap_unload(b->dmatag, b->dmamap); 107 108 if (b->dmamap && b->buf) 109 bus_dmamem_free(b->dmatag, b->buf, b->dmamap); 110 b->dmamap = NULL; 111 b->buf = NULL; 112} 113 114int 115sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz) 116{ 117 u_int8_t *tmpbuf, *f2; 118 119 chn_lock(b->channel); 120 if (b->maxsize == 0) 121 goto out; 122 if (blkcnt == 0) 123 blkcnt = b->blkcnt; 124 if (blksz == 0) 125 blksz = b->blksz; 126 if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) { 127 chn_unlock(b->channel); 128 return EINVAL; 129 } 130 if (blkcnt == b->blkcnt && blksz == b->blksz) 131 goto out; 132 133 chn_unlock(b->channel); 134 tmpbuf = malloc(blkcnt * blksz, M_DEVBUF, M_NOWAIT); 135 if (tmpbuf == NULL) 136 return ENOMEM; 137 chn_lock(b->channel); 138 b->blkcnt = blkcnt; 139 b->blksz = blksz; 140 b->bufsize = blkcnt * blksz; 141 f2 = b->tmpbuf; 142 b->tmpbuf = tmpbuf; 143 sndbuf_reset(b); 144 chn_unlock(b->channel); 145 free(f2, M_DEVBUF); 146 return 0; 147out: 148 chn_unlock(b->channel); 149 return 0; 150} 151 152int 153sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz) 154{ 155 u_int8_t *buf, *tmpbuf, *f1, *f2; 156 unsigned int bufsize; 157 int ret; 158 159 if (blkcnt < 2 || blksz < 16) 160 return EINVAL; 161 162 bufsize = blksz * blkcnt; 163 164 chn_unlock(b->channel); 165 buf = malloc(bufsize, M_DEVBUF, M_WAITOK); 166 if (buf == NULL) { 167 ret = ENOMEM; 168 goto out; 169 } 170 171 tmpbuf = malloc(bufsize, M_DEVBUF, M_WAITOK); 172 if (tmpbuf == NULL) { 173 free(buf, M_DEVBUF); 174 ret = ENOMEM; 175 goto out; 176 } 177 chn_lock(b->channel); 178 179 b->blkcnt = blkcnt; 180 b->blksz = blksz; 181 b->bufsize = bufsize; 182 b->maxsize = bufsize; 183 f1 = b->buf; 184 f2 = b->tmpbuf; 185 b->buf = buf; 186 b->tmpbuf = tmpbuf; 187 188 sndbuf_reset(b); 189 190 chn_unlock(b->channel); 191 if (f1) 192 free(f1, M_DEVBUF); 193 if (f2) 194 free(f2, M_DEVBUF); 195 196 ret = 0; 197out: 198 chn_lock(b->channel); 199 return ret; 200} 201 202void 203sndbuf_clear(struct snd_dbuf *b, unsigned int length) 204{ 205 int i; 206 u_char data, *p; 207 208 if (length == 0) 209 return; 210 if (length > b->bufsize) 211 length = b->bufsize; 212 213 if (b->fmt & AFMT_SIGNED) 214 data = 0x00; 215 else 216 data = 0x80; 217 218 i = sndbuf_getfreeptr(b); 219 p = sndbuf_getbuf(b); 220 while (length > 0) { 221 p[i] = data; 222 length--; 223 i++; 224 if (i >= b->bufsize) 225 i = 0; 226 } 227} 228 229void 230sndbuf_fillsilence(struct snd_dbuf *b) 231{ 232 int i; 233 u_char data, *p; 234 235 if (b->fmt & AFMT_SIGNED) 236 data = 0x00; 237 else 238 data = 0x80; 239 240 i = 0; 241 p = sndbuf_getbuf(b); 242 while (i < b->bufsize) 243 p[i++] = data; 244 b->rp = 0; 245 b->rl = b->bufsize; 246} 247 248void 249sndbuf_reset(struct snd_dbuf *b) 250{ 251 b->hp = 0; 252 b->rp = 0; 253 b->rl = 0; 254 b->dl = 0; 255 b->prev_total = 0; 256 b->total = 0; 257 b->xrun = 0; 258 if (b->buf && b->bufsize > 0) 259 sndbuf_clear(b, b->bufsize); 260} 261 262u_int32_t 263sndbuf_getfmt(struct snd_dbuf *b) 264{ 265 return b->fmt; 266} 267 268int 269sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt) 270{ 271 b->fmt = fmt; 272 b->bps = 1; 273 b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0; 274 b->bps <<= (b->fmt & AFMT_16BIT)? 1 : 0; 275 b->bps <<= (b->fmt & AFMT_32BIT)? 2 : 0; 276 return 0; 277} 278 279unsigned int 280sndbuf_getspd(struct snd_dbuf *b) 281{ 282 return b->spd; 283} 284 285void 286sndbuf_setspd(struct snd_dbuf *b, unsigned int spd) 287{ 288 b->spd = spd; 289} 290 291unsigned int 292sndbuf_getalign(struct snd_dbuf *b) 293{ 294 static int align[] = {0, 1, 1, 2, 2, 2, 2, 3}; 295 296 return align[b->bps - 1]; 297} 298 299unsigned int 300sndbuf_getblkcnt(struct snd_dbuf *b) 301{ 302 return b->blkcnt; 303} 304 305void 306sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt) 307{ 308 b->blkcnt = blkcnt; 309} 310 311unsigned int 312sndbuf_getblksz(struct snd_dbuf *b) 313{ 314 return b->blksz; 315} 316 317void 318sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz) 319{ 320 b->blksz = blksz; 321} 322 323unsigned int 324sndbuf_getbps(struct snd_dbuf *b) 325{ 326 return b->bps; 327} 328 329void * 330sndbuf_getbuf(struct snd_dbuf *b) 331{ 332 return b->buf; 333} 334 335void * 336sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs) 337{ 338 KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs)); 339 340 return b->buf + ofs; 341} 342 343unsigned int 344sndbuf_getsize(struct snd_dbuf *b) 345{ 346 return b->bufsize; 347} 348 349unsigned int 350sndbuf_getmaxsize(struct snd_dbuf *b) 351{ 352 return b->maxsize; 353} 354 355unsigned int 356sndbuf_runsz(struct snd_dbuf *b) 357{ 358 return b->dl; 359} 360 361void 362sndbuf_setrun(struct snd_dbuf *b, int go) 363{ 364 b->dl = go? b->blksz : 0; 365} 366 367struct selinfo * 368sndbuf_getsel(struct snd_dbuf *b) 369{ 370 return &b->sel; 371} 372 373/************************************************************/ 374unsigned int 375sndbuf_getxrun(struct snd_dbuf *b) 376{ 377 SNDBUF_LOCKASSERT(b); 378 379 return b->xrun; 380} 381 382void 383sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt) 384{ 385 SNDBUF_LOCKASSERT(b); 386 387 b->xrun = cnt; 388} 389 390unsigned int 391sndbuf_gethwptr(struct snd_dbuf *b) 392{ 393 SNDBUF_LOCKASSERT(b); 394 395 return b->hp; 396} 397 398void 399sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr) 400{ 401 SNDBUF_LOCKASSERT(b); 402 403 b->hp = ptr; 404} 405 406unsigned int 407sndbuf_getready(struct snd_dbuf *b) 408{ 409 SNDBUF_LOCKASSERT(b); 410 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 411 412 return b->rl; 413} 414 415unsigned int 416sndbuf_getreadyptr(struct snd_dbuf *b) 417{ 418 SNDBUF_LOCKASSERT(b); 419 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp)); 420 421 return b->rp; 422} 423 424unsigned int 425sndbuf_getfree(struct snd_dbuf *b) 426{ 427 SNDBUF_LOCKASSERT(b); 428 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 429 430 return b->bufsize - b->rl; 431} 432 433unsigned int 434sndbuf_getfreeptr(struct snd_dbuf *b) 435{ 436 SNDBUF_LOCKASSERT(b); 437 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp)); 438 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 439 440 return (b->rp + b->rl) % b->bufsize; 441} 442 443unsigned int 444sndbuf_getblocks(struct snd_dbuf *b) 445{ 446 SNDBUF_LOCKASSERT(b); 447 448 return b->total / b->blksz; 449} 450 451unsigned int 452sndbuf_getprevblocks(struct snd_dbuf *b) 453{ 454 SNDBUF_LOCKASSERT(b); 455 456 return b->prev_total / b->blksz; 457} 458 459unsigned int 460sndbuf_gettotal(struct snd_dbuf *b) 461{ 462 SNDBUF_LOCKASSERT(b); 463 464 return b->total; 465} 466 467void 468sndbuf_updateprevtotal(struct snd_dbuf *b) 469{ 470 SNDBUF_LOCKASSERT(b); 471 472 b->prev_total = b->total; 473} 474 475/************************************************************/ 476 477int 478sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count) 479{ 480 int l; 481 482 KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b))); 483 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 484 b->total += count; 485 if (from != NULL) { 486 while (count > 0) { 487 l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b)); 488 bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l); 489 from += l; 490 b->rl += l; 491 count -= l; 492 } 493 } else 494 b->rl += count; 495 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count)); 496 497 return 0; 498} 499 500int 501sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count) 502{ 503 int l; 504 505 KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b))); 506 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 507 if (to != NULL) { 508 while (count > 0) { 509 l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b)); 510 bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l); 511 to += l; 512 b->rl -= l; 513 b->rp = (b->rp + l) % b->bufsize; 514 count -= l; 515 } 516 } else { 517 b->rl -= count; 518 b->rp = (b->rp + count) % b->bufsize; 519 } 520 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count)); 521 522 return 0; 523} 524 525/* count is number of bytes we want added to destination buffer */ 526int 527sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count) 528{ 529 KASSERT(count > 0, ("can't feed 0 bytes")); 530 531 if (sndbuf_getfree(to) < count) 532 return EINVAL; 533 534 count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from); 535 if (count) 536 sndbuf_acquire(to, to->tmpbuf, count); 537 /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */ 538 539 return 0; 540} 541 542/************************************************************/ 543 544void 545sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what) 546{ 547 printf("%s: [", s); 548 if (what & 0x01) 549 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize); 550 if (what & 0x02) 551 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp); 552 if (what & 0x04) 553 printf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun); 554 if (what & 0x08) 555 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd); 556 if (what & 0x10) 557 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags); 558 printf(" ]\n"); 559} 560 561/************************************************************/ 562u_int32_t 563sndbuf_getflags(struct snd_dbuf *b) 564{ 565 return b->flags; 566} 567 568void 569sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on) 570{ 571 b->flags &= ~flags; 572 if (on) 573 b->flags |= flags; 574} 575 576