buffer.c revision 139749
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 139749 2005-01-06 01:43:34Z imp $"); 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; ", 65 (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len); 66 printf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr); 67 } 68 if (error == 0) 69 b->buf_addr = segs[0].ds_addr; 70 else 71 b->buf_addr = 0; 72} 73 74/* 75 * Allocate memory for DMA buffer. If the device does not use DMA transfers, 76 * the driver can call malloc(9) and sndbuf_setup() itself. 77 */ 78 79int 80sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size) 81{ 82 int ret; 83 84 b->dmatag = dmatag; 85 b->maxsize = size; 86 b->bufsize = b->maxsize; 87 b->buf_addr = 0; 88 if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT, 89 &b->dmamap)) 90 return (ENOMEM); 91 if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize, 92 sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) { 93 bus_dmamem_free(b->dmatag, b->buf, b->dmamap); 94 b->dmamap = NULL; 95 return (ENOMEM); 96 } 97 98 ret = sndbuf_resize(b, 2, b->maxsize / 2); 99 if (ret != 0) 100 sndbuf_free(b); 101 return (ret); 102} 103 104int 105sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size) 106{ 107 b->buf = buf; 108 b->maxsize = size; 109 b->bufsize = b->maxsize; 110 return sndbuf_resize(b, 2, b->maxsize / 2); 111} 112 113void 114sndbuf_free(struct snd_dbuf *b) 115{ 116 if (b->tmpbuf) 117 free(b->tmpbuf, M_DEVBUF); 118 b->tmpbuf = NULL; 119 120 if (b->dmamap) 121 bus_dmamap_unload(b->dmatag, b->dmamap); 122 123 if (b->dmamap && b->buf) 124 bus_dmamem_free(b->dmatag, b->buf, b->dmamap); 125 b->dmamap = NULL; 126 b->buf = NULL; 127} 128 129int 130sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz) 131{ 132 u_int8_t *tmpbuf, *f2; 133 134 chn_lock(b->channel); 135 if (b->maxsize == 0) 136 goto out; 137 if (blkcnt == 0) 138 blkcnt = b->blkcnt; 139 if (blksz == 0) 140 blksz = b->blksz; 141 if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) { 142 chn_unlock(b->channel); 143 return EINVAL; 144 } 145 if (blkcnt == b->blkcnt && blksz == b->blksz) 146 goto out; 147 148 chn_unlock(b->channel); 149 tmpbuf = malloc(blkcnt * blksz, M_DEVBUF, M_NOWAIT); 150 if (tmpbuf == NULL) 151 return ENOMEM; 152 chn_lock(b->channel); 153 b->blkcnt = blkcnt; 154 b->blksz = blksz; 155 b->bufsize = blkcnt * blksz; 156 f2 = b->tmpbuf; 157 b->tmpbuf = tmpbuf; 158 sndbuf_reset(b); 159 chn_unlock(b->channel); 160 free(f2, M_DEVBUF); 161 return 0; 162out: 163 chn_unlock(b->channel); 164 return 0; 165} 166 167int 168sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz) 169{ 170 u_int8_t *buf, *tmpbuf, *f1, *f2; 171 unsigned int bufsize; 172 int ret; 173 174 if (blkcnt < 2 || blksz < 16) 175 return EINVAL; 176 177 bufsize = blksz * blkcnt; 178 179 chn_unlock(b->channel); 180 buf = malloc(bufsize, M_DEVBUF, M_WAITOK); 181 if (buf == NULL) { 182 ret = ENOMEM; 183 goto out; 184 } 185 186 tmpbuf = malloc(bufsize, M_DEVBUF, M_WAITOK); 187 if (tmpbuf == NULL) { 188 free(buf, M_DEVBUF); 189 ret = ENOMEM; 190 goto out; 191 } 192 chn_lock(b->channel); 193 194 b->blkcnt = blkcnt; 195 b->blksz = blksz; 196 b->bufsize = bufsize; 197 b->maxsize = bufsize; 198 f1 = b->buf; 199 f2 = b->tmpbuf; 200 b->buf = buf; 201 b->tmpbuf = tmpbuf; 202 203 sndbuf_reset(b); 204 205 chn_unlock(b->channel); 206 if (f1) 207 free(f1, M_DEVBUF); 208 if (f2) 209 free(f2, M_DEVBUF); 210 211 ret = 0; 212out: 213 chn_lock(b->channel); 214 return ret; 215} 216 217void 218sndbuf_clear(struct snd_dbuf *b, unsigned int length) 219{ 220 int i; 221 u_char data, *p; 222 223 if (length == 0) 224 return; 225 if (length > b->bufsize) 226 length = b->bufsize; 227 228 if (b->fmt & AFMT_SIGNED) 229 data = 0x00; 230 else 231 data = 0x80; 232 233 i = sndbuf_getfreeptr(b); 234 p = sndbuf_getbuf(b); 235 while (length > 0) { 236 p[i] = data; 237 length--; 238 i++; 239 if (i >= b->bufsize) 240 i = 0; 241 } 242} 243 244void 245sndbuf_fillsilence(struct snd_dbuf *b) 246{ 247 int i; 248 u_char data, *p; 249 250 if (b->fmt & AFMT_SIGNED) 251 data = 0x00; 252 else 253 data = 0x80; 254 255 i = 0; 256 p = sndbuf_getbuf(b); 257 while (i < b->bufsize) 258 p[i++] = data; 259 b->rp = 0; 260 b->rl = b->bufsize; 261} 262 263void 264sndbuf_reset(struct snd_dbuf *b) 265{ 266 b->hp = 0; 267 b->rp = 0; 268 b->rl = 0; 269 b->dl = 0; 270 b->prev_total = 0; 271 b->total = 0; 272 b->xrun = 0; 273 if (b->buf && b->bufsize > 0) 274 sndbuf_clear(b, b->bufsize); 275} 276 277u_int32_t 278sndbuf_getfmt(struct snd_dbuf *b) 279{ 280 return b->fmt; 281} 282 283int 284sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt) 285{ 286 b->fmt = fmt; 287 b->bps = 1; 288 b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0; 289 b->bps <<= (b->fmt & AFMT_16BIT)? 1 : 0; 290 b->bps <<= (b->fmt & AFMT_32BIT)? 2 : 0; 291 return 0; 292} 293 294unsigned int 295sndbuf_getspd(struct snd_dbuf *b) 296{ 297 return b->spd; 298} 299 300void 301sndbuf_setspd(struct snd_dbuf *b, unsigned int spd) 302{ 303 b->spd = spd; 304} 305 306unsigned int 307sndbuf_getalign(struct snd_dbuf *b) 308{ 309 static int align[] = {0, 1, 1, 2, 2, 2, 2, 3}; 310 311 return align[b->bps - 1]; 312} 313 314unsigned int 315sndbuf_getblkcnt(struct snd_dbuf *b) 316{ 317 return b->blkcnt; 318} 319 320void 321sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt) 322{ 323 b->blkcnt = blkcnt; 324} 325 326unsigned int 327sndbuf_getblksz(struct snd_dbuf *b) 328{ 329 return b->blksz; 330} 331 332void 333sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz) 334{ 335 b->blksz = blksz; 336} 337 338unsigned int 339sndbuf_getbps(struct snd_dbuf *b) 340{ 341 return b->bps; 342} 343 344void * 345sndbuf_getbuf(struct snd_dbuf *b) 346{ 347 return b->buf; 348} 349 350void * 351sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs) 352{ 353 KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs)); 354 355 return b->buf + ofs; 356} 357 358unsigned int 359sndbuf_getsize(struct snd_dbuf *b) 360{ 361 return b->bufsize; 362} 363 364unsigned int 365sndbuf_getmaxsize(struct snd_dbuf *b) 366{ 367 return b->maxsize; 368} 369 370unsigned int 371sndbuf_runsz(struct snd_dbuf *b) 372{ 373 return b->dl; 374} 375 376void 377sndbuf_setrun(struct snd_dbuf *b, int go) 378{ 379 b->dl = go? b->blksz : 0; 380} 381 382struct selinfo * 383sndbuf_getsel(struct snd_dbuf *b) 384{ 385 return &b->sel; 386} 387 388/************************************************************/ 389unsigned int 390sndbuf_getxrun(struct snd_dbuf *b) 391{ 392 SNDBUF_LOCKASSERT(b); 393 394 return b->xrun; 395} 396 397void 398sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt) 399{ 400 SNDBUF_LOCKASSERT(b); 401 402 b->xrun = cnt; 403} 404 405unsigned int 406sndbuf_gethwptr(struct snd_dbuf *b) 407{ 408 SNDBUF_LOCKASSERT(b); 409 410 return b->hp; 411} 412 413void 414sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr) 415{ 416 SNDBUF_LOCKASSERT(b); 417 418 b->hp = ptr; 419} 420 421unsigned int 422sndbuf_getready(struct snd_dbuf *b) 423{ 424 SNDBUF_LOCKASSERT(b); 425 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 426 427 return b->rl; 428} 429 430unsigned int 431sndbuf_getreadyptr(struct snd_dbuf *b) 432{ 433 SNDBUF_LOCKASSERT(b); 434 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp)); 435 436 return b->rp; 437} 438 439unsigned int 440sndbuf_getfree(struct snd_dbuf *b) 441{ 442 SNDBUF_LOCKASSERT(b); 443 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 444 445 return b->bufsize - b->rl; 446} 447 448unsigned int 449sndbuf_getfreeptr(struct snd_dbuf *b) 450{ 451 SNDBUF_LOCKASSERT(b); 452 KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp)); 453 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 454 455 return (b->rp + b->rl) % b->bufsize; 456} 457 458unsigned int 459sndbuf_getblocks(struct snd_dbuf *b) 460{ 461 SNDBUF_LOCKASSERT(b); 462 463 return b->total / b->blksz; 464} 465 466unsigned int 467sndbuf_getprevblocks(struct snd_dbuf *b) 468{ 469 SNDBUF_LOCKASSERT(b); 470 471 return b->prev_total / b->blksz; 472} 473 474unsigned int 475sndbuf_gettotal(struct snd_dbuf *b) 476{ 477 SNDBUF_LOCKASSERT(b); 478 479 return b->total; 480} 481 482void 483sndbuf_updateprevtotal(struct snd_dbuf *b) 484{ 485 SNDBUF_LOCKASSERT(b); 486 487 b->prev_total = b->total; 488} 489 490/************************************************************/ 491 492int 493sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count) 494{ 495 int l; 496 497 KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b))); 498 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 499 b->total += count; 500 if (from != NULL) { 501 while (count > 0) { 502 l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b)); 503 bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l); 504 from += l; 505 b->rl += l; 506 count -= l; 507 } 508 } else 509 b->rl += count; 510 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count)); 511 512 return 0; 513} 514 515int 516sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count) 517{ 518 int l; 519 520 KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b))); 521 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl)); 522 if (to != NULL) { 523 while (count > 0) { 524 l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b)); 525 bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l); 526 to += l; 527 b->rl -= l; 528 b->rp = (b->rp + l) % b->bufsize; 529 count -= l; 530 } 531 } else { 532 b->rl -= count; 533 b->rp = (b->rp + count) % b->bufsize; 534 } 535 KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count)); 536 537 return 0; 538} 539 540/* count is number of bytes we want added to destination buffer */ 541int 542sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count) 543{ 544 KASSERT(count > 0, ("can't feed 0 bytes")); 545 546 if (sndbuf_getfree(to) < count) 547 return EINVAL; 548 549 count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from); 550 if (count) 551 sndbuf_acquire(to, to->tmpbuf, count); 552 /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */ 553 554 return 0; 555} 556 557/************************************************************/ 558 559void 560sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what) 561{ 562 printf("%s: [", s); 563 if (what & 0x01) 564 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize); 565 if (what & 0x02) 566 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp); 567 if (what & 0x04) 568 printf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun); 569 if (what & 0x08) 570 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd); 571 if (what & 0x10) 572 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags); 573 printf(" ]\n"); 574} 575 576/************************************************************/ 577u_int32_t 578sndbuf_getflags(struct snd_dbuf *b) 579{ 580 return b->flags; 581} 582 583void 584sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on) 585{ 586 b->flags &= ~flags; 587 if (on) 588 b->flags |= flags; 589} 590 591