sys/dev/sound/pcm/channel.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
   5  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
   6  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
   7  * Portions Copyright (c) Luigi Rizzo <luigi@FreeBSD.org> - 1997-99
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include "opt_isa.h"
  33
  34 #ifdef HAVE_KERNEL_OPTION_HEADERS
  35 #include "opt_snd.h"
  36 #endif
  37
  38 #include <dev/sound/pcm/sound.h>
  39 #include <dev/sound/pcm/vchan.h>
  40
  41 #include "feeder_if.h"
  42
  43 SND_DECLARE_FILE("$FreeBSD$");
  44
  45 int report_soft_formats = 1;
  46 SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_formats, CTLFLAG_RW,
  47         &report_soft_formats, 0, "report software-emulated formats");
  48
  49 int report_soft_matrix = 1;
  50 SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_matrix, CTLFLAG_RW,
  51         &report_soft_matrix, 0, "report software-emulated channel matrixing");
  52
  53 int chn_latency = CHN_LATENCY_DEFAULT;
  54
  55 static int
  56 sysctl_hw_snd_latency(SYSCTL_HANDLER_ARGS)
  57 {
  58         int err, val;
  59
  60         val = chn_latency;
  61         err = sysctl_handle_int(oidp, &val, 0, req);
  62         if (err != 0 || req->newptr == NULL)
  63                 return err;
  64         if (val < CHN_LATENCY_MIN || val > CHN_LATENCY_MAX)
  65                 err = EINVAL;
  66         else
  67                 chn_latency = val;
  68
  69         return err;
  70 }
  71 SYSCTL_PROC(_hw_snd, OID_AUTO, latency,
  72     CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, 0, sizeof(int),
  73     sysctl_hw_snd_latency, "I",
  74     "buffering latency (0=low ... 10=high)");
  75
  76 int chn_latency_profile = CHN_LATENCY_PROFILE_DEFAULT;
  77
  78 static int
  79 sysctl_hw_snd_latency_profile(SYSCTL_HANDLER_ARGS)
  80 {
  81         int err, val;
  82
  83         val = chn_latency_profile;
  84         err = sysctl_handle_int(oidp, &val, 0, req);
  85         if (err != 0 || req->newptr == NULL)
  86                 return err;
  87         if (val < CHN_LATENCY_PROFILE_MIN || val > CHN_LATENCY_PROFILE_MAX)
  88                 err = EINVAL;
  89         else
  90                 chn_latency_profile = val;
  91
  92         return err;
  93 }
  94 SYSCTL_PROC(_hw_snd, OID_AUTO, latency_profile,
  95     CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, 0, sizeof(int),
  96     sysctl_hw_snd_latency_profile, "I",
  97     "buffering latency profile (0=aggressive 1=safe)");
  98
  99 static int chn_timeout = CHN_TIMEOUT;
 100
 101 static int
 102 sysctl_hw_snd_timeout(SYSCTL_HANDLER_ARGS)
 103 {
 104         int err, val;
 105
 106         val = chn_timeout;
 107         err = sysctl_handle_int(oidp, &val, 0, req);
 108         if (err != 0 || req->newptr == NULL)
 109                 return err;
 110         if (val < CHN_TIMEOUT_MIN || val > CHN_TIMEOUT_MAX)
 111                 err = EINVAL;
 112         else
 113                 chn_timeout = val;
 114
 115         return err;
 116 }
 117 SYSCTL_PROC(_hw_snd, OID_AUTO, timeout,
 118     CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, 0, sizeof(int),
 119     sysctl_hw_snd_timeout, "I",
 120     "interrupt timeout (1 - 10) seconds");
 121
 122 static int chn_vpc_autoreset = 1;
 123 SYSCTL_INT(_hw_snd, OID_AUTO, vpc_autoreset, CTLFLAG_RWTUN,
 124         &chn_vpc_autoreset, 0, "automatically reset channels volume to 0db");
 125
 126 static int chn_vol_0db_pcm = SND_VOL_0DB_PCM;
 127
 128 static void
 129 chn_vpc_proc(int reset, int db)
 130 {
 131         struct snddev_info *d;
 132         struct pcm_channel *c;
 133         int i;
 134
 135         for (i = 0; pcm_devclass != NULL &&
 136             i < devclass_get_maxunit(pcm_devclass); i++) {
 137                 d = devclass_get_softc(pcm_devclass, i);
 138                 if (!PCM_REGISTERED(d))
 139                         continue;
 140                 PCM_LOCK(d);
 141                 PCM_WAIT(d);
 142                 PCM_ACQUIRE(d);
 143                 CHN_FOREACH(c, d, channels.pcm) {
 144                         CHN_LOCK(c);
 145                         CHN_SETVOLUME(c, SND_VOL_C_PCM, SND_CHN_T_VOL_0DB, db);
 146                         if (reset != 0)
 147                                 chn_vpc_reset(c, SND_VOL_C_PCM, 1);
 148                         CHN_UNLOCK(c);
 149                 }
 150                 PCM_RELEASE(d);
 151                 PCM_UNLOCK(d);
 152         }
 153 }
 154
 155 static int
 156 sysctl_hw_snd_vpc_0db(SYSCTL_HANDLER_ARGS)
 157 {
 158         int err, val;
 159
 160         val = chn_vol_0db_pcm;
 161         err = sysctl_handle_int(oidp, &val, 0, req);
 162         if (err != 0 || req->newptr == NULL)
 163                 return (err);
 164         if (val < SND_VOL_0DB_MIN || val > SND_VOL_0DB_MAX)
 165                 return (EINVAL);
 166
 167         chn_vol_0db_pcm = val;
 168         chn_vpc_proc(0, val);
 169
 170         return (0);
 171 }
 172 SYSCTL_PROC(_hw_snd, OID_AUTO, vpc_0db,
 173     CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, 0, sizeof(int),
 174     sysctl_hw_snd_vpc_0db, "I",
 175     "0db relative level");
 176
 177 static int
 178 sysctl_hw_snd_vpc_reset(SYSCTL_HANDLER_ARGS)
 179 {
 180         int err, val;
 181
 182         val = 0;
 183         err = sysctl_handle_int(oidp, &val, 0, req);
 184         if (err != 0 || req->newptr == NULL || val == 0)
 185                 return (err);
 186
 187         chn_vol_0db_pcm = SND_VOL_0DB_PCM;
 188         chn_vpc_proc(1, SND_VOL_0DB_PCM);
 189
 190         return (0);
 191 }
 192 SYSCTL_PROC(_hw_snd, OID_AUTO, vpc_reset,
 193     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, sizeof(int),
 194     sysctl_hw_snd_vpc_reset, "I",
 195     "reset volume on all channels");
 196
 197 static int chn_usefrags = 0;
 198 static int chn_syncdelay = -1;
 199
 200 SYSCTL_INT(_hw_snd, OID_AUTO, usefrags, CTLFLAG_RWTUN,
 201         &chn_usefrags, 0, "prefer setfragments() over setblocksize()");
 202 SYSCTL_INT(_hw_snd, OID_AUTO, syncdelay, CTLFLAG_RWTUN,
 203         &chn_syncdelay, 0,
 204         "append (0-1000) millisecond trailing buffer delay on each sync");
 205
 206 /**
 207  * @brief Channel sync group lock
 208  *
 209  * Clients should acquire this lock @b without holding any channel locks
 210  * before touching syncgroups or the main syncgroup list.
 211  */
 212 struct mtx snd_pcm_syncgroups_mtx;
 213 MTX_SYSINIT(pcm_syncgroup, &snd_pcm_syncgroups_mtx, "PCM channel sync group lock", MTX_DEF);
 214 /**
 215  * @brief syncgroups' master list
 216  *
 217  * Each time a channel syncgroup is created, it's added to this list.  This
 218  * list should only be accessed with @sa snd_pcm_syncgroups_mtx held.
 219  *
 220  * See SNDCTL_DSP_SYNCGROUP for more information.
 221  */
 222 struct pcm_synclist snd_pcm_syncgroups = SLIST_HEAD_INITIALIZER(snd_pcm_syncgroups);
 223
 224 static void
 225 chn_lockinit(struct pcm_channel *c, int dir)
 226 {
 227         switch (dir) {
 228         case PCMDIR_PLAY:
 229                 c->lock = snd_mtxcreate(c->name, "pcm play channel");
 230                 cv_init(&c->intr_cv, "pcmwr");
 231                 break;
 232         case PCMDIR_PLAY_VIRTUAL:
 233                 c->lock = snd_mtxcreate(c->name, "pcm virtual play channel");
 234                 cv_init(&c->intr_cv, "pcmwrv");
 235                 break;
 236         case PCMDIR_REC:
 237                 c->lock = snd_mtxcreate(c->name, "pcm record channel");
 238                 cv_init(&c->intr_cv, "pcmrd");
 239                 break;
 240         case PCMDIR_REC_VIRTUAL:
 241                 c->lock = snd_mtxcreate(c->name, "pcm virtual record channel");
 242                 cv_init(&c->intr_cv, "pcmrdv");
 243                 break;
 244         default:
 245                 panic("%s(): Invalid direction=%d", __func__, dir);
 246                 break;
 247         }
 248
 249         cv_init(&c->cv, "pcmchn");
 250 }
 251
 252 static void
 253 chn_lockdestroy(struct pcm_channel *c)
 254 {
 255         CHN_LOCKASSERT(c);
 256
 257         CHN_BROADCAST(&c->cv);
 258         CHN_BROADCAST(&c->intr_cv);
 259
 260         cv_destroy(&c->cv);
 261         cv_destroy(&c->intr_cv);
 262
 263         snd_mtxfree(c->lock);
 264 }
 265
 266 /**
 267  * @brief Determine channel is ready for I/O
 268  *
 269  * @retval 1 = ready for I/O
 270  * @retval 0 = not ready for I/O
 271  */
 272 static int
 273 chn_polltrigger(struct pcm_channel *c)
 274 {
 275         struct snd_dbuf *bs = c->bufsoft;
 276         u_int delta;
 277
 278         CHN_LOCKASSERT(c);
 279
 280         if (c->flags & CHN_F_MMAP) {
 281                 if (sndbuf_getprevtotal(bs) < c->lw)
 282                         delta = c->lw;
 283                 else
 284                         delta = sndbuf_gettotal(bs) - sndbuf_getprevtotal(bs);
 285         } else {
 286                 if (c->direction == PCMDIR_PLAY)
 287                         delta = sndbuf_getfree(bs);
 288                 else
 289                         delta = sndbuf_getready(bs);
 290         }
 291
 292         return ((delta < c->lw) ? 0 : 1);
 293 }
 294
 295 static void
 296 chn_pollreset(struct pcm_channel *c)
 297 {
 298
 299         CHN_LOCKASSERT(c);
 300         sndbuf_updateprevtotal(c->bufsoft);
 301 }
 302
 303 static void
 304 chn_wakeup(struct pcm_channel *c)
 305 {
 306         struct snd_dbuf *bs;
 307         struct pcm_channel *ch;
 308
 309         CHN_LOCKASSERT(c);
 310
 311         bs = c->bufsoft;
 312
 313         if (CHN_EMPTY(c, children.busy)) {
 314                 if (SEL_WAITING(sndbuf_getsel(bs)) && chn_polltrigger(c))
 315                         selwakeuppri(sndbuf_getsel(bs), PRIBIO);
 316                 if (c->flags & CHN_F_SLEEPING) {
 317                         /*
 318                          * Ok, I can just panic it right here since it is
 319                          * quite obvious that we never allow multiple waiters
 320                          * from userland. I'm too generous...
 321                          */
 322                         CHN_BROADCAST(&c->intr_cv);
 323                 }
 324         } else {
 325                 CHN_FOREACH(ch, c, children.busy) {
 326                         CHN_LOCK(ch);
 327                         chn_wakeup(ch);
 328                         CHN_UNLOCK(ch);
 329                 }
 330         }
 331 }
 332
 333 static int
 334 chn_sleep(struct pcm_channel *c, int timeout)
 335 {
 336         int ret;
 337
 338         CHN_LOCKASSERT(c);
 339
 340         if (c->flags & CHN_F_DEAD)
 341                 return (EINVAL);
 342
 343         c->flags |= CHN_F_SLEEPING;
 344         ret = cv_timedwait_sig(&c->intr_cv, c->lock, timeout);
 345         c->flags &= ~CHN_F_SLEEPING;
 346
 347         return ((c->flags & CHN_F_DEAD) ? EINVAL : ret);
 348 }
 349
 350 /*
 351  * chn_dmaupdate() tracks the status of a dma transfer,
 352  * updating pointers.
 353  */
 354
 355 static unsigned int
 356 chn_dmaupdate(struct pcm_channel *c)
 357 {
 358         struct snd_dbuf *b = c->bufhard;
 359         unsigned int delta, old, hwptr, amt;
 360
 361         KASSERT(sndbuf_getsize(b) > 0, ("bufsize == 0"));
 362         CHN_LOCKASSERT(c);
 363
 364         old = sndbuf_gethwptr(b);
 365         hwptr = chn_getptr(c);
 366         delta = (sndbuf_getsize(b) + hwptr - old) % sndbuf_getsize(b);
 367         sndbuf_sethwptr(b, hwptr);
 368
 369         if (c->direction == PCMDIR_PLAY) {
 370                 amt = min(delta, sndbuf_getready(b));
 371                 amt -= amt % sndbuf_getalign(b);
 372                 if (amt > 0)
 373                         sndbuf_dispose(b, NULL, amt);
 374         } else {
 375                 amt = min(delta, sndbuf_getfree(b));
 376                 amt -= amt % sndbuf_getalign(b);
 377                 if (amt > 0)
 378                        sndbuf_acquire(b, NULL, amt);
 379         }
 380         if (snd_verbose > 3 && CHN_STARTED(c) && delta == 0) {
 381                 device_printf(c->dev, "WARNING: %s DMA completion "
 382                         "too fast/slow ! hwptr=%u, old=%u "
 383                         "delta=%u amt=%u ready=%u free=%u\n",
 384                         CHN_DIRSTR(c), hwptr, old, delta, amt,
 385                         sndbuf_getready(b), sndbuf_getfree(b));
 386         }
 387
 388         return delta;
 389 }
 390
 391 static void
 392 chn_wrfeed(struct pcm_channel *c)
 393 {
 394         struct snd_dbuf *b = c->bufhard;
 395         struct snd_dbuf *bs = c->bufsoft;
 396         unsigned int amt, want, wasfree;
 397
 398         CHN_LOCKASSERT(c);
 399
 400         if ((c->flags & CHN_F_MMAP) && !(c->flags & CHN_F_CLOSING))
 401                 sndbuf_acquire(bs, NULL, sndbuf_getfree(bs));
 402
 403         wasfree = sndbuf_getfree(b);
 404         want = min(sndbuf_getsize(b),
 405             imax(0, sndbuf_xbytes(sndbuf_getsize(bs), bs, b) -
 406              sndbuf_getready(b)));
 407         amt = min(wasfree, want);
 408         if (amt > 0)
 409                 sndbuf_feed(bs, b, c, c->feeder, amt);
 410
 411         /*
 412          * Possible xruns. There should be no empty space left in buffer.
 413          */
 414         if (sndbuf_getready(b) < want)
 415                 c->xruns++;
 416
 417         if (sndbuf_getfree(b) < wasfree)
 418                 chn_wakeup(c);
 419 }
 420
 421 #if 0
 422 static void
 423 chn_wrupdate(struct pcm_channel *c)
 424 {
 425
 426         CHN_LOCKASSERT(c);
 427         KASSERT(c->direction == PCMDIR_PLAY, ("%s(): bad channel", __func__));
 428
 429         if ((c->flags & (CHN_F_MMAP | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
 430                 return;
 431         chn_dmaupdate(c);
 432         chn_wrfeed(c);
 433         /* tell the driver we've updated the primary buffer */
 434         chn_trigger(c, PCMTRIG_EMLDMAWR);
 435 }
 436 #endif
 437
 438 static void
 439 chn_wrintr(struct pcm_channel *c)
 440 {
 441
 442         CHN_LOCKASSERT(c);
 443         /* update pointers in primary buffer */
 444         chn_dmaupdate(c);
 445         /* ...and feed from secondary to primary */
 446         chn_wrfeed(c);
 447         /* tell the driver we've updated the primary buffer */
 448         chn_trigger(c, PCMTRIG_EMLDMAWR);
 449 }
 450
 451 /*
 452  * user write routine - uiomove data into secondary buffer, trigger if necessary
 453  * if blocking, sleep, rinse and repeat.
 454  *
 455  * called externally, so must handle locking
 456  */
 457
 458 int
 459 chn_write(struct pcm_channel *c, struct uio *buf)
 460 {
 461         struct snd_dbuf *bs = c->bufsoft;
 462         void *off;
 463         int ret, timeout, sz, t, p;
 464
 465         CHN_LOCKASSERT(c);
 466
 467         ret = 0;
 468         timeout = chn_timeout * hz;
 469
 470         while (ret == 0 && buf->uio_resid > 0) {
 471                 sz = min(buf->uio_resid, sndbuf_getfree(bs));
 472                 if (sz > 0) {
 473                         /*
 474                          * The following assumes that the free space in
 475                          * the buffer can never be less around the
 476                          * unlock-uiomove-lock sequence.
 477                          */
 478                         while (ret == 0 && sz > 0) {
 479                                 p = sndbuf_getfreeptr(bs);
 480                                 t = min(sz, sndbuf_getsize(bs) - p);
 481                                 off = sndbuf_getbufofs(bs, p);
 482                                 CHN_UNLOCK(c);
 483                                 ret = uiomove(off, t, buf);
 484                                 CHN_LOCK(c);
 485                                 sz -= t;
 486                                 sndbuf_acquire(bs, NULL, t);
 487                         }
 488                         ret = 0;
 489                         if (CHN_STOPPED(c) && !(c->flags & CHN_F_NOTRIGGER)) {
 490                                 ret = chn_start(c, 0);
 491                                 if (ret != 0)
 492                                         c->flags |= CHN_F_DEAD;
 493                         }
 494                 } else if (c->flags & (CHN_F_NBIO | CHN_F_NOTRIGGER)) {
 495                         /**
 496                          * @todo Evaluate whether EAGAIN is truly desirable.
 497                          *       4Front drivers behave like this, but I'm
 498                          *       not sure if it at all violates the "write
 499                          *       should be allowed to block" model.
 500                          *
 501                          *       The idea is that, while set with CHN_F_NOTRIGGER,
 502                          *       a channel isn't playing, *but* without this we
 503                          *       end up with "interrupt timeout / channel dead".
 504                          */
 505                         ret = EAGAIN;
 506                 } else {
 507                         ret = chn_sleep(c, timeout);
 508                         if (ret == EAGAIN) {
 509                                 ret = EINVAL;
 510                                 c->flags |= CHN_F_DEAD;
 511                                 device_printf(c->dev, "%s(): %s: "
 512                                     "play interrupt timeout, channel dead\n",
 513                                     __func__, c->name);
 514                         } else if (ret == ERESTART || ret == EINTR)
 515                                 c->flags |= CHN_F_ABORTING;
 516                 }
 517         }
 518
 519         return (ret);
 520 }
 521
 522 /*
 523  * Feed new data from the read buffer. Can be called in the bottom half.
 524  */
 525 static void
 526 chn_rdfeed(struct pcm_channel *c)
 527 {
 528         struct snd_dbuf *b = c->bufhard;
 529         struct snd_dbuf *bs = c->bufsoft;
 530         unsigned int amt;
 531
 532         CHN_LOCKASSERT(c);
 533
 534         if (c->flags & CHN_F_MMAP)
 535                 sndbuf_dispose(bs, NULL, sndbuf_getready(bs));
 536
 537         amt = sndbuf_getfree(bs);
 538         if (amt > 0)
 539                 sndbuf_feed(b, bs, c, c->feeder, amt);
 540
 541         amt = sndbuf_getready(b);
 542         if (amt > 0) {
 543                 c->xruns++;
 544                 sndbuf_dispose(b, NULL, amt);
 545         }
 546
 547         if (sndbuf_getready(bs) > 0)
 548                 chn_wakeup(c);
 549 }
 550
 551 #if 0
 552 static void
 553 chn_rdupdate(struct pcm_channel *c)
 554 {
 555
 556         CHN_LOCKASSERT(c);
 557         KASSERT(c->direction == PCMDIR_REC, ("chn_rdupdate on bad channel"));
 558
 559         if ((c->flags & (CHN_F_MMAP | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
 560                 return;
 561         chn_trigger(c, PCMTRIG_EMLDMARD);
 562         chn_dmaupdate(c);
 563         chn_rdfeed(c);
 564 }
 565 #endif
 566
 567 /* read interrupt routine. Must be called with interrupts blocked. */
 568 static void
 569 chn_rdintr(struct pcm_channel *c)
 570 {
 571
 572         CHN_LOCKASSERT(c);
 573         /* tell the driver to update the primary buffer if non-dma */
 574         chn_trigger(c, PCMTRIG_EMLDMARD);
 575         /* update pointers in primary buffer */
 576         chn_dmaupdate(c);
 577         /* ...and feed from primary to secondary */
 578         chn_rdfeed(c);
 579 }
 580
 581 /*
 582  * user read routine - trigger if necessary, uiomove data from secondary buffer
 583  * if blocking, sleep, rinse and repeat.
 584  *
 585  * called externally, so must handle locking
 586  */
 587
 588 int
 589 chn_read(struct pcm_channel *c, struct uio *buf)
 590 {
 591         struct snd_dbuf *bs = c->bufsoft;
 592         void *off;
 593         int ret, timeout, sz, t, p;
 594
 595         CHN_LOCKASSERT(c);
 596
 597         if (CHN_STOPPED(c) && !(c->flags & CHN_F_NOTRIGGER)) {
 598                 ret = chn_start(c, 0);
 599                 if (ret != 0) {
 600                         c->flags |= CHN_F_DEAD;
 601                         return (ret);
 602                 }
 603         }
 604
 605         ret = 0;
 606         timeout = chn_timeout * hz;
 607
 608         while (ret == 0 && buf->uio_resid > 0) {
 609                 sz = min(buf->uio_resid, sndbuf_getready(bs));
 610                 if (sz > 0) {
 611                         /*
 612                          * The following assumes that the free space in
 613                          * the buffer can never be less around the
 614                          * unlock-uiomove-lock sequence.
 615                          */
 616                         while (ret == 0 && sz > 0) {
 617                                 p = sndbuf_getreadyptr(bs);
 618                                 t = min(sz, sndbuf_getsize(bs) - p);
 619                                 off = sndbuf_getbufofs(bs, p);
 620                                 CHN_UNLOCK(c);
 621                                 ret = uiomove(off, t, buf);
 622                                 CHN_LOCK(c);
 623                                 sz -= t;
 624                                 sndbuf_dispose(bs, NULL, t);
 625                         }
 626                         ret = 0;
 627                 } else if (c->flags & (CHN_F_NBIO | CHN_F_NOTRIGGER))
 628                         ret = EAGAIN;
 629                 else {
 630                         ret = chn_sleep(c, timeout);
 631                         if (ret == EAGAIN) {
 632                                 ret = EINVAL;
 633                                 c->flags |= CHN_F_DEAD;
 634                                 device_printf(c->dev, "%s(): %s: "
 635                                     "record interrupt timeout, channel dead\n",
 636                                     __func__, c->name);
 637                         } else if (ret == ERESTART || ret == EINTR)
 638                                 c->flags |= CHN_F_ABORTING;
 639                 }
 640         }
 641
 642         return (ret);
 643 }
 644
 645 void
 646 chn_intr_locked(struct pcm_channel *c)
 647 {
 648
 649         CHN_LOCKASSERT(c);
 650
 651         c->interrupts++;
 652
 653         if (c->direction == PCMDIR_PLAY)
 654                 chn_wrintr(c);
 655         else
 656                 chn_rdintr(c);
 657 }
 658
 659 void
 660 chn_intr(struct pcm_channel *c)
 661 {
 662
 663         if (CHN_LOCKOWNED(c)) {
 664                 chn_intr_locked(c);
 665                 return;
 666         }
 667
 668         CHN_LOCK(c);
 669         chn_intr_locked(c);
 670         CHN_UNLOCK(c);
 671 }
 672
 673 u_int32_t
 674 chn_start(struct pcm_channel *c, int force)
 675 {
 676         u_int32_t i, j;
 677         struct snd_dbuf *b = c->bufhard;
 678         struct snd_dbuf *bs = c->bufsoft;
 679         int err;
 680
 681         CHN_LOCKASSERT(c);
 682         /* if we're running, or if we're prevented from triggering, bail */
 683         if (CHN_STARTED(c) || ((c->flags & CHN_F_NOTRIGGER) && !force))
 684                 return (EINVAL);
 685
 686         err = 0;
 687
 688         if (force) {
 689                 i = 1;
 690                 j = 0;
 691         } else {
 692                 if (c->direction == PCMDIR_REC) {
 693                         i = sndbuf_getfree(bs);
 694                         j = (i > 0) ? 1 : sndbuf_getready(b);
 695                 } else {
 696                         if (sndbuf_getfree(bs) == 0) {
 697                                 i = 1;
 698                                 j = 0;
 699                         } else {
 700                                 struct snd_dbuf *pb;
 701
 702                                 pb = CHN_BUF_PARENT(c, b);
 703                                 i = sndbuf_xbytes(sndbuf_getready(bs), bs, pb);
 704                                 j = sndbuf_getalign(pb);
 705                         }
 706                 }
 707                 if (snd_verbose > 3 && CHN_EMPTY(c, children))
 708                         device_printf(c->dev, "%s(): %s (%s) threshold "
 709                             "i=%d j=%d\n", __func__, CHN_DIRSTR(c),
 710                             (c->flags & CHN_F_VIRTUAL) ? "virtual" :
 711                             "hardware", i, j);
 712         }
 713
 714         if (i >= j) {
 715                 c->flags |= CHN_F_TRIGGERED;
 716                 sndbuf_setrun(b, 1);
 717                 if (c->flags & CHN_F_CLOSING)
 718                         c->feedcount = 2;
 719                 else {
 720                         c->feedcount = 0;
 721                         c->interrupts = 0;
 722                         c->xruns = 0;
 723                 }
 724                 if (c->parentchannel == NULL) {
 725                         if (c->direction == PCMDIR_PLAY)
 726                                 sndbuf_fillsilence_rl(b,
 727                                     sndbuf_xbytes(sndbuf_getsize(bs), bs, b));
 728                         if (snd_verbose > 3)
 729                                 device_printf(c->dev,
 730                                     "%s(): %s starting! (%s/%s) "
 731                                     "(ready=%d force=%d i=%d j=%d "
 732                                     "intrtimeout=%u latency=%dms)\n",
 733                                     __func__,
 734                                     (c->flags & CHN_F_HAS_VCHAN) ?
 735                                     "VCHAN PARENT" : "HW", CHN_DIRSTR(c),
 736                                     (c->flags & CHN_F_CLOSING) ? "closing" :
 737                                     "running",
 738                                     sndbuf_getready(b),
 739                                     force, i, j, c->timeout,
 740                                     (sndbuf_getsize(b) * 1000) /
 741                                     (sndbuf_getalign(b) * sndbuf_getspd(b)));
 742                 }
 743                 err = chn_trigger(c, PCMTRIG_START);
 744         }
 745
 746         return (err);
 747 }
 748
 749 void
 750 chn_resetbuf(struct pcm_channel *c)
 751 {
 752         struct snd_dbuf *b = c->bufhard;
 753         struct snd_dbuf *bs = c->bufsoft;
 754
 755         c->blocks = 0;
 756         sndbuf_reset(b);
 757         sndbuf_reset(bs);
 758 }
 759
 760 /*
 761  * chn_sync waits until the space in the given channel goes above
 762  * a threshold. The threshold is checked against fl or rl respectively.
 763  * Assume that the condition can become true, do not check here...
 764  */
 765 int
 766 chn_sync(struct pcm_channel *c, int threshold)
 767 {
 768         struct snd_dbuf *b, *bs;
 769         int ret, count, hcount, minflush, resid, residp, syncdelay, blksz;
 770         u_int32_t cflag;
 771
 772         CHN_LOCKASSERT(c);
 773
 774         if (c->direction != PCMDIR_PLAY)
 775                 return (EINVAL);
 776
 777         bs = c->bufsoft;
 778
 779         if ((c->flags & (CHN_F_DEAD | CHN_F_ABORTING)) ||
 780             (threshold < 1 && sndbuf_getready(bs) < 1))
 781                 return (0);
 782
 783         /* if we haven't yet started and nothing is buffered, else start*/
 784         if (CHN_STOPPED(c)) {
 785                 if (threshold > 0 || sndbuf_getready(bs) > 0) {
 786                         ret = chn_start(c, 1);
 787                         if (ret != 0)
 788                                 return (ret);
 789                 } else
 790                         return (0);
 791         }
 792
 793         b = CHN_BUF_PARENT(c, c->bufhard);
 794
 795         minflush = threshold + sndbuf_xbytes(sndbuf_getready(b), b, bs);
 796
 797         syncdelay = chn_syncdelay;
 798
 799         if (syncdelay < 0 && (threshold > 0 || sndbuf_getready(bs) > 0))
 800                 minflush += sndbuf_xbytes(sndbuf_getsize(b), b, bs);
 801
 802         /*
 803          * Append (0-1000) millisecond trailing buffer (if needed)
 804          * for slower / high latency hardwares (notably USB audio)
 805          * to avoid audible truncation.
 806          */
 807         if (syncdelay > 0)
 808                 minflush += (sndbuf_getalign(bs) * sndbuf_getspd(bs) *
 809                     ((syncdelay > 1000) ? 1000 : syncdelay)) / 1000;
 810
 811         minflush -= minflush % sndbuf_getalign(bs);
 812
 813         if (minflush > 0) {
 814                 threshold = min(minflush, sndbuf_getfree(bs));
 815                 sndbuf_clear(bs, threshold);
 816                 sndbuf_acquire(bs, NULL, threshold);
 817                 minflush -= threshold;
 818         }
 819
 820         resid = sndbuf_getready(bs);
 821         residp = resid;
 822         blksz = sndbuf_getblksz(b);
 823         if (blksz < 1) {
 824                 device_printf(c->dev,
 825                     "%s(): WARNING: blksz < 1 ! maxsize=%d [%d/%d/%d]\n",
 826                     __func__, sndbuf_getmaxsize(b), sndbuf_getsize(b),
 827                     sndbuf_getblksz(b), sndbuf_getblkcnt(b));
 828                 if (sndbuf_getblkcnt(b) > 0)
 829                         blksz = sndbuf_getsize(b) / sndbuf_getblkcnt(b);
 830                 if (blksz < 1)
 831                         blksz = 1;
 832         }
 833         count = sndbuf_xbytes(minflush + resid, bs, b) / blksz;
 834         hcount = count;
 835         ret = 0;
 836
 837         if (snd_verbose > 3)
 838                 device_printf(c->dev, "%s(): [begin] timeout=%d count=%d "
 839                     "minflush=%d resid=%d\n", __func__, c->timeout, count,
 840                     minflush, resid);
 841
 842         cflag = c->flags & CHN_F_CLOSING;
 843         c->flags |= CHN_F_CLOSING;
 844         while (count > 0 && (resid > 0 || minflush > 0)) {
 845                 ret = chn_sleep(c, c->timeout);
 846                 if (ret == ERESTART || ret == EINTR) {
 847                         c->flags |= CHN_F_ABORTING;
 848                         break;
 849                 } else if (ret == 0 || ret == EAGAIN) {
 850                         resid = sndbuf_getready(bs);
 851                         if (resid == residp) {
 852                                 --count;
 853                                 if (snd_verbose > 3)
 854                                         device_printf(c->dev,
 855                                             "%s(): [stalled] timeout=%d "
 856                                             "count=%d hcount=%d "
 857                                             "resid=%d minflush=%d\n",
 858                                             __func__, c->timeout, count,
 859                                             hcount, resid, minflush);
 860                         } else if (resid < residp && count < hcount) {
 861                                 ++count;
 862                                 if (snd_verbose > 3)
 863                                         device_printf(c->dev,
 864                                             "%s((): [resume] timeout=%d "
 865                                             "count=%d hcount=%d "
 866                                             "resid=%d minflush=%d\n",
 867                                             __func__, c->timeout, count,
 868                                             hcount, resid, minflush);
 869                         }
 870                         if (minflush > 0 && sndbuf_getfree(bs) > 0) {
 871                                 threshold = min(minflush,
 872                                     sndbuf_getfree(bs));
 873                                 sndbuf_clear(bs, threshold);
 874                                 sndbuf_acquire(bs, NULL, threshold);
 875                                 resid = sndbuf_getready(bs);
 876                                 minflush -= threshold;
 877                         }
 878                         residp = resid;
 879                 } else
 880                         break;
 881         }
 882         c->flags &= ~CHN_F_CLOSING;
 883         c->flags |= cflag;
 884
 885         if (snd_verbose > 3)
 886                 device_printf(c->dev,
 887                     "%s(): timeout=%d count=%d hcount=%d resid=%d residp=%d "
 888                     "minflush=%d ret=%d\n",
 889                     __func__, c->timeout, count, hcount, resid, residp,
 890                     minflush, ret);
 891
 892         return (0);
 893 }
 894
 895 /* called externally, handle locking */
 896 int
 897 chn_poll(struct pcm_channel *c, int ev, struct thread *td)
 898 {
 899         struct snd_dbuf *bs = c->bufsoft;
 900         int ret;
 901
 902         CHN_LOCKASSERT(c);
 903
 904         if (!(c->flags & (CHN_F_MMAP | CHN_F_TRIGGERED))) {
 905                 ret = chn_start(c, 1);
 906                 if (ret != 0)
 907                         return (0);
 908         }
 909
 910         ret = 0;
 911         if (chn_polltrigger(c)) {
 912                 chn_pollreset(c);
 913                 ret = ev;
 914         } else
 915                 selrecord(td, sndbuf_getsel(bs));
 916
 917         return (ret);
 918 }
 919
 920 /*
 921  * chn_abort terminates a running dma transfer.  it may sleep up to 200ms.
 922  * it returns the number of bytes that have not been transferred.
 923  *
 924  * called from: dsp_close, dsp_ioctl, with channel locked
 925  */
 926 int
 927 chn_abort(struct pcm_channel *c)
 928 {
 929         int missing = 0;
 930         struct snd_dbuf *b = c->bufhard;
 931         struct snd_dbuf *bs = c->bufsoft;
 932
 933         CHN_LOCKASSERT(c);
 934         if (CHN_STOPPED(c))
 935                 return 0;
 936         c->flags |= CHN_F_ABORTING;
 937
 938         c->flags &= ~CHN_F_TRIGGERED;
 939         /* kill the channel */
 940         chn_trigger(c, PCMTRIG_ABORT);
 941         sndbuf_setrun(b, 0);
 942         if (!(c->flags & CHN_F_VIRTUAL))
 943                 chn_dmaupdate(c);
 944         missing = sndbuf_getready(bs);
 945
 946         c->flags &= ~CHN_F_ABORTING;
 947         return missing;
 948 }
 949
 950 /*
 951  * this routine tries to flush the dma transfer. It is called
 952  * on a close of a playback channel.
 953  * first, if there is data in the buffer, but the dma has not yet
 954  * begun, we need to start it.
 955  * next, we wait for the play buffer to drain
 956  * finally, we stop the dma.
 957  *
 958  * called from: dsp_close, not valid for record channels.
 959  */
 960
 961 int
 962 chn_flush(struct pcm_channel *c)
 963 {
 964         struct snd_dbuf *b = c->bufhard;
 965
 966         CHN_LOCKASSERT(c);
 967         KASSERT(c->direction == PCMDIR_PLAY, ("chn_flush on bad channel"));
 968         DEB(printf("chn_flush: c->flags 0x%08x\n", c->flags));
 969
 970         c->flags |= CHN_F_CLOSING;
 971         chn_sync(c, 0);
 972         c->flags &= ~CHN_F_TRIGGERED;
 973         /* kill the channel */
 974         chn_trigger(c, PCMTRIG_ABORT);
 975         sndbuf_setrun(b, 0);
 976
 977         c->flags &= ~CHN_F_CLOSING;
 978         return 0;
 979 }
 980
 981 int
 982 snd_fmtvalid(uint32_t fmt, uint32_t *fmtlist)
 983 {
 984         int i;
 985
 986         for (i = 0; fmtlist[i] != 0; i++) {
 987                 if (fmt == fmtlist[i] ||
 988                     ((fmt & AFMT_PASSTHROUGH) &&
 989                     (AFMT_ENCODING(fmt) & fmtlist[i])))
 990                         return (1);
 991         }
 992
 993         return (0);
 994 }
 995
 996 static const struct {
 997         char *name, *alias1, *alias2;
 998         uint32_t afmt;
 999 } afmt_tab[] = {
1000         {  "alaw",  NULL, NULL, AFMT_A_LAW  },
1001         { "mulaw",  NULL, NULL, AFMT_MU_LAW },
1002         {    "u8",   "8", NULL, AFMT_U8     },
1003         {    "s8",  NULL, NULL, AFMT_S8     },
1004 #if BYTE_ORDER == LITTLE_ENDIAN
1005         { "s16le", "s16", "16", AFMT_S16_LE },
1006         { "s16be",  NULL, NULL, AFMT_S16_BE },
1007 #else
1008         { "s16le",  NULL, NULL, AFMT_S16_LE },
1009         { "s16be", "s16", "16", AFMT_S16_BE },
1010 #endif
1011         { "u16le",  NULL, NULL, AFMT_U16_LE },
1012         { "u16be",  NULL, NULL, AFMT_U16_BE },
1013         { "s24le",  NULL, NULL, AFMT_S24_LE },
1014         { "s24be",  NULL, NULL, AFMT_S24_BE },
1015         { "u24le",  NULL, NULL, AFMT_U24_LE },
1016         { "u24be",  NULL, NULL, AFMT_U24_BE },
1017 #if BYTE_ORDER == LITTLE_ENDIAN
1018         { "s32le", "s32", "32", AFMT_S32_LE },
1019         { "s32be",  NULL, NULL, AFMT_S32_BE },
1020 #else
1021         { "s32le",  NULL, NULL, AFMT_S32_LE },
1022         { "s32be", "s32", "32", AFMT_S32_BE },
1023 #endif
1024         { "u32le",  NULL, NULL, AFMT_U32_LE },
1025         { "u32be",  NULL, NULL, AFMT_U32_BE },
1026         {   "ac3",  NULL, NULL, AFMT_AC3    },
1027         {    NULL,  NULL, NULL, 0           }
1028 };
1029
1030 uint32_t
1031 snd_str2afmt(const char *req)
1032 {
1033         int ext;
1034         int ch;
1035         int i;
1036         char b1[8];
1037         char b2[8];
1038
1039         memset(b1, 0, sizeof(b1));
1040         memset(b2, 0, sizeof(b2));
1041
1042         i = sscanf(req, "%5[^:]:%6s", b1, b2);
1043
1044         if (i == 1) {
1045                 if (strlen(req) != strlen(b1))
1046                         return (0);
1047                 strlcpy(b2, "2.0", sizeof(b2));
1048         } else if (i == 2) {
1049                 if (strlen(req) != (strlen(b1) + 1 + strlen(b2)))
1050                         return (0);
1051         } else
1052                 return (0);
1053
1054         i = sscanf(b2, "%d.%d", &ch, &ext);
1055
1056         if (i == 0) {
1057                 if (strcasecmp(b2, "mono") == 0) {
1058                         ch = 1;
1059                         ext = 0;
1060                 } else if (strcasecmp(b2, "stereo") == 0) {
1061                         ch = 2;
1062                         ext = 0;
1063                 } else if (strcasecmp(b2, "quad") == 0) {
1064                         ch = 4;
1065                         ext = 0;
1066                 } else
1067                         return (0);
1068         } else if (i == 1) {
1069                 if (ch < 1 || ch > AFMT_CHANNEL_MAX)
1070                         return (0);
1071                 ext = 0;
1072         } else if (i == 2) {
1073                 if (ext < 0 || ext > AFMT_EXTCHANNEL_MAX)
1074                         return (0);
1075                 if (ch < 1 || (ch + ext) > AFMT_CHANNEL_MAX)
1076                         return (0);
1077         } else
1078                 return (0);
1079
1080         for (i = 0; afmt_tab[i].name != NULL; i++) {
1081                 if (strcasecmp(afmt_tab[i].name, b1) != 0) {
1082                         if (afmt_tab[i].alias1 == NULL)
1083                                 continue;
1084                         if (strcasecmp(afmt_tab[i].alias1, b1) != 0) {
1085                                 if (afmt_tab[i].alias2 == NULL)
1086                                         continue;
1087                                 if (strcasecmp(afmt_tab[i].alias2, b1) != 0)
1088                                         continue;
1089                         }
1090                 }
1091                 /* found a match */
1092                 return (SND_FORMAT(afmt_tab[i].afmt, ch + ext, ext));
1093         }
1094         /* not a valid format */
1095         return (0);
1096 }
1097
1098 uint32_t
1099 snd_afmt2str(uint32_t afmt, char *buf, size_t len)
1100 {
1101         uint32_t enc;
1102         uint32_t ext;
1103         uint32_t ch;
1104         int i;
1105
1106         if (buf == NULL || len < AFMTSTR_LEN)
1107                 return (0);
1108
1109         memset(buf, 0, len);
1110
1111         enc = AFMT_ENCODING(afmt);
1112         ch = AFMT_CHANNEL(afmt);
1113         ext = AFMT_EXTCHANNEL(afmt);
1114         /* check there is at least one channel */
1115         if (ch <= ext)
1116                 return (0);
1117         for (i = 0; afmt_tab[i].name != NULL; i++) {
1118                 if (enc != afmt_tab[i].afmt)
1119                         continue;
1120                 /* found a match */
1121                 snprintf(buf, len, "%s:%d.%d",
1122                     afmt_tab[i].name, ch - ext, ext);
1123                 return (SND_FORMAT(enc, ch, ext));
1124         }
1125         return (0);
1126 }
1127
1128 int
1129 chn_reset(struct pcm_channel *c, uint32_t fmt, uint32_t spd)
1130 {
1131         int r;
1132
1133         CHN_LOCKASSERT(c);
1134         c->feedcount = 0;
1135         c->flags &= CHN_F_RESET;
1136         c->interrupts = 0;
1137         c->timeout = 1;
1138         c->xruns = 0;
1139
1140         c->flags |= (pcm_getflags(c->dev) & SD_F_BITPERFECT) ?
1141             CHN_F_BITPERFECT : 0;
1142
1143         r = CHANNEL_RESET(c->methods, c->devinfo);
1144         if (r == 0 && fmt != 0 && spd != 0) {
1145                 r = chn_setparam(c, fmt, spd);
1146                 fmt = 0;
1147                 spd = 0;
1148         }
1149         if (r == 0 && fmt != 0)
1150                 r = chn_setformat(c, fmt);
1151         if (r == 0 && spd != 0)
1152                 r = chn_setspeed(c, spd);
1153         if (r == 0)
1154                 r = chn_setlatency(c, chn_latency);
1155         if (r == 0) {
1156                 chn_resetbuf(c);
1157                 r = CHANNEL_RESETDONE(c->methods, c->devinfo);
1158         }
1159         return r;
1160 }
1161
1162 int
1163 chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction)
1164 {
1165         struct feeder_class *fc;
1166         struct snd_dbuf *b, *bs;
1167         int i, ret;
1168
1169         if (chn_timeout < CHN_TIMEOUT_MIN || chn_timeout > CHN_TIMEOUT_MAX)
1170                 chn_timeout = CHN_TIMEOUT;
1171
1172         chn_lockinit(c, dir);
1173
1174         b = NULL;
1175         bs = NULL;
1176         CHN_INIT(c, children);
1177         CHN_INIT(c, children.busy);
1178         c->devinfo = NULL;
1179         c->feeder = NULL;
1180         c->latency = -1;
1181         c->timeout = 1;
1182
1183         ret = ENOMEM;
1184         b = sndbuf_create(c->dev, c->name, "primary", c);
1185         if (b == NULL)
1186                 goto out;
1187         bs = sndbuf_create(c->dev, c->name, "secondary", c);
1188         if (bs == NULL)
1189                 goto out;
1190
1191         CHN_LOCK(c);
1192
1193         ret = EINVAL;
1194         fc = feeder_getclass(NULL);
1195         if (fc == NULL)
1196                 goto out;
1197         if (chn_addfeeder(c, fc, NULL))
1198                 goto out;
1199
1200         /*
1201          * XXX - sndbuf_setup() & sndbuf_resize() expect to be called
1202          *       with the channel unlocked because they are also called
1203          *       from driver methods that don't know about locking
1204          */
1205         CHN_UNLOCK(c);
1206         sndbuf_setup(bs, NULL, 0);
1207         CHN_LOCK(c);
1208         c->bufhard = b;
1209         c->bufsoft = bs;
1210         c->flags = 0;
1211         c->feederflags = 0;
1212         c->sm = NULL;
1213         c->format = SND_FORMAT(AFMT_U8, 1, 0);
1214         c->speed = DSP_DEFAULT_SPEED;
1215
1216         c->matrix = *feeder_matrix_id_map(SND_CHN_MATRIX_1_0);
1217         c->matrix.id = SND_CHN_MATRIX_PCMCHANNEL;
1218
1219         for (i = 0; i < SND_CHN_T_MAX; i++) {
1220                 c->volume[SND_VOL_C_MASTER][i] = SND_VOL_0DB_MASTER;
1221         }
1222
1223         c->volume[SND_VOL_C_MASTER][SND_CHN_T_VOL_0DB] = SND_VOL_0DB_MASTER;
1224         c->volume[SND_VOL_C_PCM][SND_CHN_T_VOL_0DB] = chn_vol_0db_pcm;
1225
1226         chn_vpc_reset(c, SND_VOL_C_PCM, 1);
1227
1228         ret = ENODEV;
1229         CHN_UNLOCK(c); /* XXX - Unlock for CHANNEL_INIT() malloc() call */
1230         c->devinfo = CHANNEL_INIT(c->methods, devinfo, b, c, direction);
1231         CHN_LOCK(c);
1232         if (c->devinfo == NULL)
1233                 goto out;
1234
1235         ret = ENOMEM;
1236         if ((sndbuf_getsize(b) == 0) && ((c->flags & CHN_F_VIRTUAL) == 0))
1237                 goto out;
1238
1239         ret = 0;
1240         c->direction = direction;
1241
1242         sndbuf_setfmt(b, c->format);
1243         sndbuf_setspd(b, c->speed);
1244         sndbuf_setfmt(bs, c->format);
1245         sndbuf_setspd(bs, c->speed);
1246
1247         /**
1248          * @todo Should this be moved somewhere else?  The primary buffer
1249          *       is allocated by the driver or via DMA map setup, and tmpbuf
1250          *       seems to only come into existence in sndbuf_resize().
1251          */
1252         if (c->direction == PCMDIR_PLAY) {
1253                 bs->sl = sndbuf_getmaxsize(bs);
1254                 bs->shadbuf = malloc(bs->sl, M_DEVBUF, M_NOWAIT);
1255                 if (bs->shadbuf == NULL) {
1256                         ret = ENOMEM;
1257                         goto out;
1258                 }
1259         }
1260
1261 out:
1262         CHN_UNLOCK(c);
1263         if (ret) {
1264                 if (c->devinfo) {
1265                         if (CHANNEL_FREE(c->methods, c->devinfo))
1266                                 sndbuf_free(b);
1267                 }
1268                 if (bs)
1269                         sndbuf_destroy(bs);
1270                 if (b)
1271                         sndbuf_destroy(b);
1272                 CHN_LOCK(c);
1273                 c->flags |= CHN_F_DEAD;
1274                 chn_lockdestroy(c);
1275
1276                 return ret;
1277         }
1278
1279         return 0;
1280 }
1281
1282 int
1283 chn_kill(struct pcm_channel *c)
1284 {
1285         struct snd_dbuf *b = c->bufhard;
1286         struct snd_dbuf *bs = c->bufsoft;
1287
1288         if (CHN_STARTED(c)) {
1289                 CHN_LOCK(c);
1290                 chn_trigger(c, PCMTRIG_ABORT);
1291                 CHN_UNLOCK(c);
1292         }
1293         while (chn_removefeeder(c) == 0)
1294                 ;
1295         if (CHANNEL_FREE(c->methods, c->devinfo))
1296                 sndbuf_free(b);
1297         sndbuf_destroy(bs);
1298         sndbuf_destroy(b);
1299         CHN_LOCK(c);
1300         c->flags |= CHN_F_DEAD;
1301         chn_lockdestroy(c);
1302
1303         return (0);
1304 }
1305
1306 /* XXX Obsolete. Use *_matrix() variant instead. */
1307 int
1308 chn_setvolume(struct pcm_channel *c, int left, int right)
1309 {
1310         int ret;
1311
1312         ret = chn_setvolume_matrix(c, SND_VOL_C_MASTER, SND_CHN_T_FL, left);
1313         ret |= chn_setvolume_matrix(c, SND_VOL_C_MASTER, SND_CHN_T_FR,
1314             right) << 8;
1315
1316         return (ret);
1317 }
1318
1319 int
1320 chn_setvolume_multi(struct pcm_channel *c, int vc, int left, int right,
1321     int center)
1322 {
1323         int i, ret;
1324
1325         ret = 0;
1326
1327         for (i = 0; i < SND_CHN_T_MAX; i++) {
1328                 if ((1 << i) & SND_CHN_LEFT_MASK)
1329                         ret |= chn_setvolume_matrix(c, vc, i, left);
1330                 else if ((1 << i) & SND_CHN_RIGHT_MASK)
1331                         ret |= chn_setvolume_matrix(c, vc, i, right) << 8;
1332                 else
1333                         ret |= chn_setvolume_matrix(c, vc, i, center) << 16;
1334         }
1335
1336         return (ret);
1337 }
1338
1339 int
1340 chn_setvolume_matrix(struct pcm_channel *c, int vc, int vt, int val)
1341 {
1342         int i;
1343
1344         KASSERT(c != NULL && vc >= SND_VOL_C_MASTER && vc < SND_VOL_C_MAX &&
1345             (vc == SND_VOL_C_MASTER || (vc & 1)) &&
1346             (vt == SND_CHN_T_VOL_0DB || (vt >= SND_CHN_T_BEGIN &&
1347             vt <= SND_CHN_T_END)) && (vt != SND_CHN_T_VOL_0DB ||
1348             (val >= SND_VOL_0DB_MIN && val <= SND_VOL_0DB_MAX)),
1349             ("%s(): invalid volume matrix c=%p vc=%d vt=%d val=%d",
1350             __func__, c, vc, vt, val));
1351         CHN_LOCKASSERT(c);
1352
1353         if (val < 0)
1354                 val = 0;
1355         if (val > 100)
1356                 val = 100;
1357
1358         c->volume[vc][vt] = val;
1359
1360         /*
1361          * Do relative calculation here and store it into class + 1
1362          * to ease the job of feeder_volume.
1363          */
1364         if (vc == SND_VOL_C_MASTER) {
1365                 for (vc = SND_VOL_C_BEGIN; vc <= SND_VOL_C_END;
1366                     vc += SND_VOL_C_STEP)
1367                         c->volume[SND_VOL_C_VAL(vc)][vt] =
1368                             SND_VOL_CALC_VAL(c->volume, vc, vt);
1369         } else if (vc & 1) {
1370                 if (vt == SND_CHN_T_VOL_0DB)
1371                         for (i = SND_CHN_T_BEGIN; i <= SND_CHN_T_END;
1372                             i += SND_CHN_T_STEP) {
1373                                 c->volume[SND_VOL_C_VAL(vc)][i] =
1374                                     SND_VOL_CALC_VAL(c->volume, vc, i);
1375                         }
1376                 else
1377                         c->volume[SND_VOL_C_VAL(vc)][vt] =
1378                             SND_VOL_CALC_VAL(c->volume, vc, vt);
1379         }
1380
1381         return (val);
1382 }
1383
1384 int
1385 chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt)
1386 {
1387         KASSERT(c != NULL && vc >= SND_VOL_C_MASTER && vc < SND_VOL_C_MAX &&
1388             (vt == SND_CHN_T_VOL_0DB ||
1389             (vt >= SND_CHN_T_BEGIN && vt <= SND_CHN_T_END)),
1390             ("%s(): invalid volume matrix c=%p vc=%d vt=%d",
1391             __func__, c, vc, vt));
1392         CHN_LOCKASSERT(c);
1393
1394         return (c->volume[vc][vt]);
1395 }
1396
1397 struct pcmchan_matrix *
1398 chn_getmatrix(struct pcm_channel *c)
1399 {
1400
1401         KASSERT(c != NULL, ("%s(): NULL channel", __func__));
1402         CHN_LOCKASSERT(c);
1403
1404         if (!(c->format & AFMT_CONVERTIBLE))
1405                 return (NULL);
1406
1407         return (&c->matrix);
1408 }
1409
1410 int
1411 chn_setmatrix(struct pcm_channel *c, struct pcmchan_matrix *m)
1412 {
1413
1414         KASSERT(c != NULL && m != NULL,
1415             ("%s(): NULL channel or matrix", __func__));
1416         CHN_LOCKASSERT(c);
1417
1418         if (!(c->format & AFMT_CONVERTIBLE))
1419                 return (EINVAL);
1420
1421         c->matrix = *m;
1422         c->matrix.id = SND_CHN_MATRIX_PCMCHANNEL;
1423
1424         return (chn_setformat(c, SND_FORMAT(c->format, m->channels, m->ext)));
1425 }
1426
1427 /*
1428  * XXX chn_oss_* exists for the sake of compatibility.
1429  */
1430 int
1431 chn_oss_getorder(struct pcm_channel *c, unsigned long long *map)
1432 {
1433
1434         KASSERT(c != NULL && map != NULL,
1435             ("%s(): NULL channel or map", __func__));
1436         CHN_LOCKASSERT(c);
1437
1438         if (!(c->format & AFMT_CONVERTIBLE))
1439                 return (EINVAL);
1440
1441         return (feeder_matrix_oss_get_channel_order(&c->matrix, map));
1442 }
1443
1444 int
1445 chn_oss_setorder(struct pcm_channel *c, unsigned long long *map)
1446 {
1447         struct pcmchan_matrix m;
1448         int ret;
1449
1450         KASSERT(c != NULL && map != NULL,
1451             ("%s(): NULL channel or map", __func__));
1452         CHN_LOCKASSERT(c);
1453
1454         if (!(c->format & AFMT_CONVERTIBLE))
1455                 return (EINVAL);
1456
1457         m = c->matrix;
1458         ret = feeder_matrix_oss_set_channel_order(&m, map);
1459         if (ret != 0)
1460                 return (ret);
1461
1462         return (chn_setmatrix(c, &m));
1463 }
1464
1465 #define SND_CHN_OSS_FRONT       (SND_CHN_T_MASK_FL | SND_CHN_T_MASK_FR)
1466 #define SND_CHN_OSS_SURR        (SND_CHN_T_MASK_SL | SND_CHN_T_MASK_SR)
1467 #define SND_CHN_OSS_CENTER_LFE  (SND_CHN_T_MASK_FC | SND_CHN_T_MASK_LF)
1468 #define SND_CHN_OSS_REAR        (SND_CHN_T_MASK_BL | SND_CHN_T_MASK_BR)
1469
1470 int
1471 chn_oss_getmask(struct pcm_channel *c, uint32_t *retmask)
1472 {
1473         struct pcmchan_matrix *m;
1474         struct pcmchan_caps *caps;
1475         uint32_t i, format;
1476
1477         KASSERT(c != NULL && retmask != NULL,
1478             ("%s(): NULL channel or retmask", __func__));
1479         CHN_LOCKASSERT(c);
1480
1481         caps = chn_getcaps(c);
1482         if (caps == NULL || caps->fmtlist == NULL)
1483                 return (ENODEV);
1484
1485         for (i = 0; caps->fmtlist[i] != 0; i++) {
1486                 format = caps->fmtlist[i];
1487                 if (!(format & AFMT_CONVERTIBLE)) {
1488                         *retmask |= DSP_BIND_SPDIF;
1489                         continue;
1490                 }
1491                 m = CHANNEL_GETMATRIX(c->methods, c->devinfo, format);
1492                 if (m == NULL)
1493                         continue;
1494                 if (m->mask & SND_CHN_OSS_FRONT)
1495                         *retmask |= DSP_BIND_FRONT;
1496                 if (m->mask & SND_CHN_OSS_SURR)
1497                         *retmask |= DSP_BIND_SURR;
1498                 if (m->mask & SND_CHN_OSS_CENTER_LFE)
1499                         *retmask |= DSP_BIND_CENTER_LFE;
1500                 if (m->mask & SND_CHN_OSS_REAR)
1501                         *retmask |= DSP_BIND_REAR;
1502         }
1503
1504         /* report software-supported binding mask */
1505         if (!CHN_BITPERFECT(c) && report_soft_matrix)
1506                 *retmask |= DSP_BIND_FRONT | DSP_BIND_SURR |
1507                     DSP_BIND_CENTER_LFE | DSP_BIND_REAR;
1508
1509         return (0);
1510 }
1511
1512 void
1513 chn_vpc_reset(struct pcm_channel *c, int vc, int force)
1514 {
1515         int i;
1516
1517         KASSERT(c != NULL && vc >= SND_VOL_C_BEGIN && vc <= SND_VOL_C_END,
1518             ("%s(): invalid reset c=%p vc=%d", __func__, c, vc));
1519         CHN_LOCKASSERT(c);
1520
1521         if (force == 0 && chn_vpc_autoreset == 0)
1522                 return;
1523
1524         for (i = SND_CHN_T_BEGIN; i <= SND_CHN_T_END; i += SND_CHN_T_STEP)
1525                 CHN_SETVOLUME(c, vc, i, c->volume[vc][SND_CHN_T_VOL_0DB]);
1526 }
1527
1528 static u_int32_t
1529 round_pow2(u_int32_t v)
1530 {
1531         u_int32_t ret;
1532
1533         if (v < 2)
1534                 v = 2;
1535         ret = 0;
1536         while (v >> ret)
1537                 ret++;
1538         ret = 1 << (ret - 1);
1539         while (ret < v)
1540                 ret <<= 1;
1541         return ret;
1542 }
1543
1544 static u_int32_t
1545 round_blksz(u_int32_t v, int round)
1546 {
1547         u_int32_t ret, tmp;
1548
1549         if (round < 1)
1550                 round = 1;
1551
1552         ret = min(round_pow2(v), CHN_2NDBUFMAXSIZE >> 1);
1553
1554         if (ret > v && (ret >> 1) > 0 && (ret >> 1) >= ((v * 3) >> 2))
1555                 ret >>= 1;
1556
1557         tmp = ret - (ret % round);
1558         while (tmp < 16 || tmp < round) {
1559                 ret <<= 1;
1560                 tmp = ret - (ret % round);
1561         }
1562
1563         return ret;
1564 }
1565
1566 /*
1567  * 4Front call it DSP Policy, while we call it "Latency Profile". The idea
1568  * is to keep 2nd buffer short so that it doesn't cause long queue during
1569  * buffer transfer.
1570  *
1571  *    Latency reference table for 48khz stereo 16bit: (PLAY)
1572  *
1573  *      +---------+------------+-----------+------------+
1574  *      | Latency | Blockcount | Blocksize | Buffersize |
1575  *      +---------+------------+-----------+------------+
1576  *      |     0   |       2    |   64      |    128     |
1577  *      +---------+------------+-----------+------------+
1578  *      |     1   |       4    |   128     |    512     |
1579  *      +---------+------------+-----------+------------+
1580  *      |     2   |       8    |   512     |    4096    |
1581  *      +---------+------------+-----------+------------+
1582  *      |     3   |      16    |   512     |    8192    |
1583  *      +---------+------------+-----------+------------+
1584  *      |     4   |      32    |   512     |    16384   |
1585  *      +---------+------------+-----------+------------+
1586  *      |     5   |      32    |   1024    |    32768   |
1587  *      +---------+------------+-----------+------------+
1588  *      |     6   |      16    |   2048    |    32768   |
1589  *      +---------+------------+-----------+------------+
1590  *      |     7   |       8    |   4096    |    32768   |
1591  *      +---------+------------+-----------+------------+
1592  *      |     8   |       4    |   8192    |    32768   |
1593  *      +---------+------------+-----------+------------+
1594  *      |     9   |       2    |   16384   |    32768   |
1595  *      +---------+------------+-----------+------------+
1596  *      |    10   |       2    |   32768   |    65536   |
1597  *      +---------+------------+-----------+------------+
1598  *
1599  * Recording need a different reference table. All we care is
1600  * gobbling up everything within reasonable buffering threshold.
1601  *
1602  *    Latency reference table for 48khz stereo 16bit: (REC)
1603  *
1604  *      +---------+------------+-----------+------------+
1605  *      | Latency | Blockcount | Blocksize | Buffersize |
1606  *      +---------+------------+-----------+------------+
1607  *      |     0   |     512    |   32      |    16384   |
1608  *      +---------+------------+-----------+------------+
1609  *      |     1   |     256    |   64      |    16384   |
1610  *      +---------+------------+-----------+------------+
1611  *      |     2   |     128    |   128     |    16384   |
1612  *      +---------+------------+-----------+------------+
1613  *      |     3   |      64    |   256     |    16384   |
1614  *      +---------+------------+-----------+------------+
1615  *      |     4   |      32    |   512     |    16384   |
1616  *      +---------+------------+-----------+------------+
1617  *      |     5   |      32    |   1024    |    32768   |
1618  *      +---------+------------+-----------+------------+
1619  *      |     6   |      16    |   2048    |    32768   |
1620  *      +---------+------------+-----------+------------+
1621  *      |     7   |       8    |   4096    |    32768   |
1622  *      +---------+------------+-----------+------------+
1623  *      |     8   |       4    |   8192    |    32768   |
1624  *      +---------+------------+-----------+------------+
1625  *      |     9   |       2    |   16384   |    32768   |
1626  *      +---------+------------+-----------+------------+
1627  *      |    10   |       2    |   32768   |    65536   |
1628  *      +---------+------------+-----------+------------+
1629  *
1630  * Calculations for other data rate are entirely based on these reference
1631  * tables. For normal operation, Latency 5 seems give the best, well
1632  * balanced performance for typical workload. Anything below 5 will
1633  * eat up CPU to keep up with increasing context switches because of
1634  * shorter buffer space and usually require the application to handle it
1635  * aggresively through possibly real time programming technique.
1636  *
1637  */
1638 #define CHN_LATENCY_PBLKCNT_REF                         \
1639         {{1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 1},             \
1640         {1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 1}}
1641 #define CHN_LATENCY_PBUFSZ_REF                          \
1642         {{7, 9, 12, 13, 14, 15, 15, 15, 15, 15, 16},    \
1643         {11, 12, 13, 14, 15, 16, 16, 16, 16, 16, 17}}
1644
1645 #define CHN_LATENCY_RBLKCNT_REF                         \
1646         {{9, 8, 7, 6, 5, 5, 4, 3, 2, 1, 1},             \
1647         {9, 8, 7, 6, 5, 5, 4, 3, 2, 1, 1}}
1648 #define CHN_LATENCY_RBUFSZ_REF                          \
1649         {{14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 16},  \
1650         {15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17}}
1651
1652 #define CHN_LATENCY_DATA_REF    192000 /* 48khz stereo 16bit ~ 48000 x 2 x 2 */
1653
1654 static int
1655 chn_calclatency(int dir, int latency, int bps, u_int32_t datarate,
1656                                 u_int32_t max, int *rblksz, int *rblkcnt)
1657 {
1658         static int pblkcnts[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
1659             CHN_LATENCY_PBLKCNT_REF;
1660         static int  pbufszs[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
1661             CHN_LATENCY_PBUFSZ_REF;
1662         static int rblkcnts[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
1663             CHN_LATENCY_RBLKCNT_REF;
1664         static int  rbufszs[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
1665             CHN_LATENCY_RBUFSZ_REF;
1666         u_int32_t bufsz;
1667         int lprofile, blksz, blkcnt;
1668
1669         if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX ||
1670             bps < 1 || datarate < 1 ||
1671             !(dir == PCMDIR_PLAY || dir == PCMDIR_REC)) {
1672                 if (rblksz != NULL)
1673                         *rblksz = CHN_2NDBUFMAXSIZE >> 1;
1674                 if (rblkcnt != NULL)
1675                         *rblkcnt = 2;
1676                 printf("%s(): FAILED dir=%d latency=%d bps=%d "
1677                     "datarate=%u max=%u\n",
1678                     __func__, dir, latency, bps, datarate, max);
1679                 return CHN_2NDBUFMAXSIZE;
1680         }
1681
1682         lprofile = chn_latency_profile;
1683
1684         if (dir == PCMDIR_PLAY) {
1685                 blkcnt = pblkcnts[lprofile][latency];
1686                 bufsz = pbufszs[lprofile][latency];
1687         } else {
1688                 blkcnt = rblkcnts[lprofile][latency];
1689                 bufsz = rbufszs[lprofile][latency];
1690         }
1691
1692         bufsz = round_pow2(snd_xbytes(1 << bufsz, CHN_LATENCY_DATA_REF,
1693             datarate));
1694         if (bufsz > max)
1695                 bufsz = max;
1696         blksz = round_blksz(bufsz >> blkcnt, bps);
1697
1698         if (rblksz != NULL)
1699                 *rblksz = blksz;
1700         if (rblkcnt != NULL)
1701                 *rblkcnt = 1 << blkcnt;
1702
1703         return blksz << blkcnt;
1704 }
1705
1706 static int
1707 chn_resizebuf(struct pcm_channel *c, int latency,
1708                                         int blkcnt, int blksz)
1709 {
1710         struct snd_dbuf *b, *bs, *pb;
1711         int sblksz, sblkcnt, hblksz, hblkcnt, limit = 0, nsblksz, nsblkcnt;
1712         int ret;
1713
1714         CHN_LOCKASSERT(c);
1715
1716         if ((c->flags & (CHN_F_MMAP | CHN_F_TRIGGERED)) ||
1717             !(c->direction == PCMDIR_PLAY || c->direction == PCMDIR_REC))
1718                 return EINVAL;
1719
1720         if (latency == -1) {
1721                 c->latency = -1;
1722                 latency = chn_latency;
1723         } else if (latency == -2) {
1724                 latency = c->latency;
1725                 if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX)
1726                         latency = chn_latency;
1727         } else if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX)
1728                 return EINVAL;
1729         else {
1730                 c->latency = latency;
1731         }
1732
1733         bs = c->bufsoft;
1734         b = c->bufhard;
1735
1736         if (!(blksz == 0 || blkcnt == -1) &&
1737             (blksz < 16 || blksz < sndbuf_getalign(bs) || blkcnt < 2 ||
1738             (blksz * blkcnt) > CHN_2NDBUFMAXSIZE))
1739                 return EINVAL;
1740
1741         chn_calclatency(c->direction, latency, sndbuf_getalign(bs),
1742             sndbuf_getalign(bs) * sndbuf_getspd(bs), CHN_2NDBUFMAXSIZE,
1743             &sblksz, &sblkcnt);
1744
1745         if (blksz == 0 || blkcnt == -1) {
1746                 if (blkcnt == -1)
1747                         c->flags &= ~CHN_F_HAS_SIZE;
1748                 if (c->flags & CHN_F_HAS_SIZE) {
1749                         blksz = sndbuf_getblksz(bs);
1750                         blkcnt = sndbuf_getblkcnt(bs);
1751                 }
1752         } else
1753                 c->flags |= CHN_F_HAS_SIZE;
1754
1755         if (c->flags & CHN_F_HAS_SIZE) {
1756                 /*
1757                  * The application has requested their own blksz/blkcnt.
1758                  * Just obey with it, and let them toast alone. We can
1759                  * clamp it to the nearest latency profile, but that would
1760                  * defeat the purpose of having custom control. The least
1761                  * we can do is round it to the nearest ^2 and align it.
1762                  */
1763                 sblksz = round_blksz(blksz, sndbuf_getalign(bs));
1764                 sblkcnt = round_pow2(blkcnt);
1765         }
1766
1767         if (c->parentchannel != NULL) {
1768                 pb = c->parentchannel->bufsoft;
1769                 CHN_UNLOCK(c);
1770                 CHN_LOCK(c->parentchannel);
1771                 chn_notify(c->parentchannel, CHN_N_BLOCKSIZE);
1772                 CHN_UNLOCK(c->parentchannel);
1773                 CHN_LOCK(c);
1774                 if (c->direction == PCMDIR_PLAY) {
1775                         limit = (pb != NULL) ?
1776                             sndbuf_xbytes(sndbuf_getsize(pb), pb, bs) : 0;
1777                 } else {
1778                         limit = (pb != NULL) ?
1779                             sndbuf_xbytes(sndbuf_getblksz(pb), pb, bs) * 2 : 0;
1780                 }
1781         } else {
1782                 hblkcnt = 2;
1783                 if (c->flags & CHN_F_HAS_SIZE) {
1784                         hblksz = round_blksz(sndbuf_xbytes(sblksz, bs, b),
1785                             sndbuf_getalign(b));
1786                         hblkcnt = round_pow2(sndbuf_getblkcnt(bs));
1787                 } else
1788                         chn_calclatency(c->direction, latency,
1789                             sndbuf_getalign(b),
1790                             sndbuf_getalign(b) * sndbuf_getspd(b),
1791                             CHN_2NDBUFMAXSIZE, &hblksz, &hblkcnt);
1792
1793                 if ((hblksz << 1) > sndbuf_getmaxsize(b))
1794                         hblksz = round_blksz(sndbuf_getmaxsize(b) >> 1,
1795                             sndbuf_getalign(b));
1796
1797                 while ((hblksz * hblkcnt) > sndbuf_getmaxsize(b)) {
1798                         if (hblkcnt < 4)
1799                                 hblksz >>= 1;
1800                         else
1801                                 hblkcnt >>= 1;
1802                 }
1803
1804                 hblksz -= hblksz % sndbuf_getalign(b);
1805
1806 #if 0
1807                 hblksz = sndbuf_getmaxsize(b) >> 1;
1808                 hblksz -= hblksz % sndbuf_getalign(b);
1809                 hblkcnt = 2;
1810 #endif
1811
1812                 CHN_UNLOCK(c);
1813                 if (chn_usefrags == 0 ||
1814                     CHANNEL_SETFRAGMENTS(c->methods, c->devinfo,
1815                     hblksz, hblkcnt) != 0)
1816                         sndbuf_setblksz(b, CHANNEL_SETBLOCKSIZE(c->methods,
1817                             c->devinfo, hblksz));
1818                 CHN_LOCK(c);
1819
1820                 if (!CHN_EMPTY(c, children)) {
1821                         nsblksz = round_blksz(
1822                             sndbuf_xbytes(sndbuf_getblksz(b), b, bs),
1823                             sndbuf_getalign(bs));
1824                         nsblkcnt = sndbuf_getblkcnt(b);
1825                         if (c->direction == PCMDIR_PLAY) {
1826                                 do {
1827                                         nsblkcnt--;
1828                                 } while (nsblkcnt >= 2 &&
1829                                     nsblksz * nsblkcnt >= sblksz * sblkcnt);
1830                                 nsblkcnt++;
1831                         }
1832                         sblksz = nsblksz;
1833                         sblkcnt = nsblkcnt;
1834                         limit = 0;
1835                 } else
1836                         limit = sndbuf_xbytes(sndbuf_getblksz(b), b, bs) * 2;
1837         }
1838
1839         if (limit > CHN_2NDBUFMAXSIZE)
1840                 limit = CHN_2NDBUFMAXSIZE;
1841
1842 #if 0
1843         while (limit > 0 && (sblksz * sblkcnt) > limit) {
1844                 if (sblkcnt < 4)
1845                         break;
1846                 sblkcnt >>= 1;
1847         }
1848 #endif
1849
1850         while ((sblksz * sblkcnt) < limit)
1851                 sblkcnt <<= 1;
1852
1853         while ((sblksz * sblkcnt) > CHN_2NDBUFMAXSIZE) {
1854                 if (sblkcnt < 4)
1855                         sblksz >>= 1;
1856                 else
1857                         sblkcnt >>= 1;
1858         }
1859
1860         sblksz -= sblksz % sndbuf_getalign(bs);
1861
1862         if (sndbuf_getblkcnt(bs) != sblkcnt || sndbuf_getblksz(bs) != sblksz ||
1863             sndbuf_getsize(bs) != (sblkcnt * sblksz)) {
1864                 ret = sndbuf_remalloc(bs, sblkcnt, sblksz);
1865                 if (ret != 0) {
1866                         device_printf(c->dev, "%s(): Failed: %d %d\n",
1867                             __func__, sblkcnt, sblksz);
1868                         return ret;
1869                 }
1870         }
1871
1872         /*
1873          * Interrupt timeout
1874          */
1875         c->timeout = ((u_int64_t)hz * sndbuf_getsize(bs)) /
1876             ((u_int64_t)sndbuf_getspd(bs) * sndbuf_getalign(bs));
1877         if (c->parentchannel != NULL)
1878                 c->timeout = min(c->timeout, c->parentchannel->timeout);
1879         if (c->timeout < 1)
1880                 c->timeout = 1;
1881
1882         /*
1883          * OSSv4 docs: "By default OSS will set the low water level equal
1884          * to the fragment size which is optimal in most cases."
1885          */
1886         c->lw = sndbuf_getblksz(bs);
1887         chn_resetbuf(c);
1888
1889         if (snd_verbose > 3)
1890                 device_printf(c->dev, "%s(): %s (%s) timeout=%u "
1891                     "b[%d/%d/%d] bs[%d/%d/%d] limit=%d\n",
1892                     __func__, CHN_DIRSTR(c),
1893                     (c->flags & CHN_F_VIRTUAL) ? "virtual" : "hardware",
1894                     c->timeout,
1895                     sndbuf_getsize(b), sndbuf_getblksz(b),
1896                     sndbuf_getblkcnt(b),
1897                     sndbuf_getsize(bs), sndbuf_getblksz(bs),
1898                     sndbuf_getblkcnt(bs), limit);
1899
1900         return 0;
1901 }
1902
1903 int
1904 chn_setlatency(struct pcm_channel *c, int latency)
1905 {
1906         CHN_LOCKASSERT(c);
1907         /* Destroy blksz/blkcnt, enforce latency profile. */
1908         return chn_resizebuf(c, latency, -1, 0);
1909 }
1910
1911 int
1912 chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz)
1913 {
1914         CHN_LOCKASSERT(c);
1915         /* Destroy latency profile, enforce blksz/blkcnt */
1916         return chn_resizebuf(c, -1, blkcnt, blksz);
1917 }
1918
1919 int
1920 chn_setparam(struct pcm_channel *c, uint32_t format, uint32_t speed)
1921 {
1922         struct pcmchan_caps *caps;
1923         uint32_t hwspeed, delta;
1924         int ret;
1925
1926         CHN_LOCKASSERT(c);
1927
1928         if (speed < 1 || format == 0 || CHN_STARTED(c))
1929                 return (EINVAL);
1930
1931         c->format = format;
1932         c->speed = speed;
1933
1934         caps = chn_getcaps(c);
1935
1936         hwspeed = speed;
1937         RANGE(hwspeed, caps->minspeed, caps->maxspeed);
1938
1939         sndbuf_setspd(c->bufhard, CHANNEL_SETSPEED(c->methods, c->devinfo,
1940             hwspeed));
1941         hwspeed = sndbuf_getspd(c->bufhard);
1942
1943         delta = (hwspeed > speed) ? (hwspeed - speed) : (speed - hwspeed);
1944
1945         if (delta <= feeder_rate_round)
1946                 c->speed = hwspeed;
1947
1948         ret = feeder_chain(c);
1949
1950         if (ret == 0)
1951                 ret = CHANNEL_SETFORMAT(c->methods, c->devinfo,
1952                     sndbuf_getfmt(c->bufhard));
1953
1954         if (ret == 0)
1955                 ret = chn_resizebuf(c, -2, 0, 0);
1956
1957         return (ret);
1958 }
1959
1960 int
1961 chn_setspeed(struct pcm_channel *c, uint32_t speed)
1962 {
1963         uint32_t oldformat, oldspeed, format;
1964         int ret;
1965
1966 #if 0
1967         /* XXX force 48k */
1968         if (c->format & AFMT_PASSTHROUGH)
1969                 speed = AFMT_PASSTHROUGH_RATE;
1970 #endif
1971
1972         oldformat = c->format;
1973         oldspeed = c->speed;
1974         format = oldformat;
1975
1976         ret = chn_setparam(c, format, speed);
1977         if (ret != 0) {
1978                 if (snd_verbose > 3)
1979                         device_printf(c->dev,
1980                             "%s(): Setting speed %d failed, "
1981                             "falling back to %d\n",
1982                             __func__, speed, oldspeed);
1983                 chn_setparam(c, c->format, oldspeed);
1984         }
1985
1986         return (ret);
1987 }
1988
1989 int
1990 chn_setformat(struct pcm_channel *c, uint32_t format)
1991 {
1992         uint32_t oldformat, oldspeed, speed;
1993         int ret;
1994
1995         /* XXX force stereo */
1996         if ((format & AFMT_PASSTHROUGH) && AFMT_CHANNEL(format) < 2) {
1997                 format = SND_FORMAT(format, AFMT_PASSTHROUGH_CHANNEL,
1998                     AFMT_PASSTHROUGH_EXTCHANNEL);
1999         }
2000
2001         oldformat = c->format;
2002         oldspeed = c->speed;
2003         speed = oldspeed;
2004
2005         ret = chn_setparam(c, format, speed);
2006         if (ret != 0) {
2007                 if (snd_verbose > 3)
2008                         device_printf(c->dev,
2009                             "%s(): Format change 0x%08x failed, "
2010                             "falling back to 0x%08x\n",
2011                             __func__, format, oldformat);
2012                 chn_setparam(c, oldformat, oldspeed);
2013         }
2014
2015         return (ret);
2016 }
2017
2018 void
2019 chn_syncstate(struct pcm_channel *c)
2020 {
2021         struct snddev_info *d;
2022         struct snd_mixer *m;
2023
2024         d = (c != NULL) ? c->parentsnddev : NULL;
2025         m = (d != NULL && d->mixer_dev != NULL) ? d->mixer_dev->si_drv1 :
2026             NULL;
2027
2028         if (d == NULL || m == NULL)
2029                 return;
2030
2031         CHN_LOCKASSERT(c);
2032
2033         if (c->feederflags & (1 << FEEDER_VOLUME)) {
2034                 uint32_t parent;
2035                 int vol, pvol, left, right, center;
2036
2037                 if (c->direction == PCMDIR_PLAY &&
2038                     (d->flags & SD_F_SOFTPCMVOL)) {
2039                         /* CHN_UNLOCK(c); */
2040                         vol = mix_get(m, SOUND_MIXER_PCM);
2041                         parent = mix_getparent(m, SOUND_MIXER_PCM);
2042                         if (parent != SOUND_MIXER_NONE)
2043                                 pvol = mix_get(m, parent);
2044                         else
2045                                 pvol = 100 | (100 << 8);
2046                         /* CHN_LOCK(c); */
2047                 } else {
2048                         vol = 100 | (100 << 8);
2049                         pvol = vol;
2050                 }
2051
2052                 if (vol == -1) {
2053                         device_printf(c->dev,
2054                             "Soft PCM Volume: Failed to read pcm "
2055                             "default value\n");
2056                         vol = 100 | (100 << 8);
2057                 }
2058
2059                 if (pvol == -1) {
2060                         device_printf(c->dev,
2061                             "Soft PCM Volume: Failed to read parent "
2062                             "default value\n");
2063                         pvol = 100 | (100 << 8);
2064                 }
2065
2066                 left = ((vol & 0x7f) * (pvol & 0x7f)) / 100;
2067                 right = (((vol >> 8) & 0x7f) * ((pvol >> 8) & 0x7f)) / 100;
2068                 center = (left + right) >> 1;
2069
2070                 chn_setvolume_multi(c, SND_VOL_C_MASTER, left, right, center);
2071         }
2072
2073         if (c->feederflags & (1 << FEEDER_EQ)) {
2074                 struct pcm_feeder *f;
2075                 int treble, bass, state;
2076
2077                 /* CHN_UNLOCK(c); */
2078                 treble = mix_get(m, SOUND_MIXER_TREBLE);
2079                 bass = mix_get(m, SOUND_MIXER_BASS);
2080                 /* CHN_LOCK(c); */
2081
2082                 if (treble == -1)
2083                         treble = 50;
2084                 else
2085                         treble = ((treble & 0x7f) +
2086                             ((treble >> 8) & 0x7f)) >> 1;
2087
2088                 if (bass == -1)
2089                         bass = 50;
2090                 else
2091                         bass = ((bass & 0x7f) + ((bass >> 8) & 0x7f)) >> 1;
2092
2093                 f = chn_findfeeder(c, FEEDER_EQ);
2094                 if (f != NULL) {
2095                         if (FEEDER_SET(f, FEEDEQ_TREBLE, treble) != 0)
2096                                 device_printf(c->dev,
2097                                     "EQ: Failed to set treble -- %d\n",
2098                                     treble);
2099                         if (FEEDER_SET(f, FEEDEQ_BASS, bass) != 0)
2100                                 device_printf(c->dev,
2101                                     "EQ: Failed to set bass -- %d\n",
2102                                     bass);
2103                         if (FEEDER_SET(f, FEEDEQ_PREAMP, d->eqpreamp) != 0)
2104                                 device_printf(c->dev,
2105                                     "EQ: Failed to set preamp -- %d\n",
2106                                     d->eqpreamp);
2107                         if (d->flags & SD_F_EQ_BYPASSED)
2108                                 state = FEEDEQ_BYPASS;
2109                         else if (d->flags & SD_F_EQ_ENABLED)
2110                                 state = FEEDEQ_ENABLE;
2111                         else
2112                                 state = FEEDEQ_DISABLE;
2113                         if (FEEDER_SET(f, FEEDEQ_STATE, state) != 0)
2114                                 device_printf(c->dev,
2115                                     "EQ: Failed to set state -- %d\n", state);
2116                 }
2117         }
2118 }
2119
2120 int
2121 chn_trigger(struct pcm_channel *c, int go)
2122 {
2123 #ifdef DEV_ISA
2124         struct snd_dbuf *b = c->bufhard;
2125 #endif
2126         struct snddev_info *d = c->parentsnddev;
2127         int ret;
2128
2129         CHN_LOCKASSERT(c);
2130 #ifdef DEV_ISA
2131         if (SND_DMA(b) && (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD))
2132                 sndbuf_dmabounce(b);
2133 #endif
2134         if (!PCMTRIG_COMMON(go))
2135                 return (CHANNEL_TRIGGER(c->methods, c->devinfo, go));
2136
2137         if (go == c->trigger)
2138                 return (0);
2139
2140         ret = CHANNEL_TRIGGER(c->methods, c->devinfo, go);
2141         if (ret != 0)
2142                 return (ret);
2143
2144         switch (go) {
2145         case PCMTRIG_START:
2146                 if (snd_verbose > 3)
2147                         device_printf(c->dev,
2148                             "%s() %s: calling go=0x%08x , "
2149                             "prev=0x%08x\n", __func__, c->name, go,
2150                             c->trigger);
2151                 if (c->trigger != PCMTRIG_START) {
2152                         c->trigger = go;
2153                         CHN_UNLOCK(c);
2154                         PCM_LOCK(d);
2155                         CHN_INSERT_HEAD(d, c, channels.pcm.busy);
2156                         PCM_UNLOCK(d);
2157                         CHN_LOCK(c);
2158                         chn_syncstate(c);
2159                 }
2160                 break;
2161         case PCMTRIG_STOP:
2162         case PCMTRIG_ABORT:
2163                 if (snd_verbose > 3)
2164                         device_printf(c->dev,
2165                             "%s() %s: calling go=0x%08x , "
2166                             "prev=0x%08x\n", __func__, c->name, go,
2167                             c->trigger);
2168                 if (c->trigger == PCMTRIG_START) {
2169                         c->trigger = go;
2170                         CHN_UNLOCK(c);
2171                         PCM_LOCK(d);
2172                         CHN_REMOVE(d, c, channels.pcm.busy);
2173                         PCM_UNLOCK(d);
2174                         CHN_LOCK(c);
2175                 }
2176                 break;
2177         default:
2178                 break;
2179         }
2180
2181         return (0);
2182 }
2183
2184 /**
2185  * @brief Queries sound driver for sample-aligned hardware buffer pointer index
2186  *
2187  * This function obtains the hardware pointer location, then aligns it to
2188  * the current bytes-per-sample value before returning.  (E.g., a channel
2189  * running in 16 bit stereo mode would require 4 bytes per sample, so a
2190  * hwptr value ranging from 32-35 would be returned as 32.)
2191  *
2192  * @param c     PCM channel context
2193  * @returns     sample-aligned hardware buffer pointer index
2194  */
2195 int
2196 chn_getptr(struct pcm_channel *c)
2197 {
2198         int hwptr;
2199
2200         CHN_LOCKASSERT(c);
2201         hwptr = (CHN_STARTED(c)) ? CHANNEL_GETPTR(c->methods, c->devinfo) : 0;
2202         return (hwptr - (hwptr % sndbuf_getalign(c->bufhard)));
2203 }
2204
2205 struct pcmchan_caps *
2206 chn_getcaps(struct pcm_channel *c)
2207 {
2208         CHN_LOCKASSERT(c);
2209         return CHANNEL_GETCAPS(c->methods, c->devinfo);
2210 }
2211
2212 u_int32_t
2213 chn_getformats(struct pcm_channel *c)
2214 {
2215         u_int32_t *fmtlist, fmts;
2216         int i;
2217
2218         fmtlist = chn_getcaps(c)->fmtlist;
2219         fmts = 0;
2220         for (i = 0; fmtlist[i]; i++)
2221                 fmts |= fmtlist[i];
2222
2223         /* report software-supported formats */
2224         if (!CHN_BITPERFECT(c) && report_soft_formats)
2225                 fmts |= AFMT_CONVERTIBLE;
2226
2227         return (AFMT_ENCODING(fmts));
2228 }
2229
2230 int
2231 chn_notify(struct pcm_channel *c, u_int32_t flags)
2232 {
2233         struct pcm_channel *ch;
2234         struct pcmchan_caps *caps;
2235         uint32_t bestformat, bestspeed, besthwformat, *vchanformat, *vchanrate;
2236         uint32_t vpflags;
2237         int dirty, err, run, nrun;
2238
2239         CHN_LOCKASSERT(c);
2240
2241         if (CHN_EMPTY(c, children))
2242                 return (ENODEV);
2243
2244         err = 0;
2245
2246         /*
2247          * If the hwchan is running, we can't change its rate, format or
2248          * blocksize
2249          */
2250         run = (CHN_STARTED(c)) ? 1 : 0;
2251         if (run)
2252                 flags &= CHN_N_VOLUME | CHN_N_TRIGGER;
2253
2254         if (flags & CHN_N_RATE) {
2255                 /*
2256                  * XXX I'll make good use of this someday.
2257                  *     However this is currently being superseded by
2258                  *     the availability of CHN_F_VCHAN_DYNAMIC.
2259                  */
2260         }
2261
2262         if (flags & CHN_N_FORMAT) {
2263                 /*
2264                  * XXX I'll make good use of this someday.
2265                  *     However this is currently being superseded by
2266                  *     the availability of CHN_F_VCHAN_DYNAMIC.
2267                  */
2268         }
2269
2270         if (flags & CHN_N_VOLUME) {
2271                 /*
2272                  * XXX I'll make good use of this someday, though
2273                  *     soft volume control is currently pretty much
2274                  *     integrated.
2275                  */
2276         }
2277
2278         if (flags & CHN_N_BLOCKSIZE) {
2279                 /*
2280                  * Set to default latency profile
2281                  */
2282                 chn_setlatency(c, chn_latency);
2283         }
2284
2285         if ((flags & CHN_N_TRIGGER) && !(c->flags & CHN_F_VCHAN_DYNAMIC)) {
2286                 nrun = CHN_EMPTY(c, children.busy) ? 0 : 1;
2287                 if (nrun && !run)
2288                         err = chn_start(c, 1);
2289                 if (!nrun && run)
2290                         chn_abort(c);
2291                 flags &= ~CHN_N_TRIGGER;
2292         }
2293
2294         if (flags & CHN_N_TRIGGER) {
2295                 if (c->direction == PCMDIR_PLAY) {
2296                         vchanformat = &c->parentsnddev->pvchanformat;
2297                         vchanrate = &c->parentsnddev->pvchanrate;
2298                 } else {
2299                         vchanformat = &c->parentsnddev->rvchanformat;
2300                         vchanrate = &c->parentsnddev->rvchanrate;
2301                 }
2302
2303                 /* Dynamic Virtual Channel */
2304                 if (!(c->flags & CHN_F_VCHAN_ADAPTIVE)) {
2305                         bestformat = *vchanformat;
2306                         bestspeed = *vchanrate;
2307                 } else {
2308                         bestformat = 0;
2309                         bestspeed = 0;
2310                 }
2311
2312                 besthwformat = 0;
2313                 nrun = 0;
2314                 caps = chn_getcaps(c);
2315                 dirty = 0;
2316                 vpflags = 0;
2317
2318                 CHN_FOREACH(ch, c, children.busy) {
2319                         CHN_LOCK(ch);
2320                         if ((ch->format & AFMT_PASSTHROUGH) &&
2321                             snd_fmtvalid(ch->format, caps->fmtlist)) {
2322                                 bestformat = ch->format;
2323                                 bestspeed = ch->speed;
2324                                 CHN_UNLOCK(ch);
2325                                 vpflags = CHN_F_PASSTHROUGH;
2326                                 nrun++;
2327                                 break;
2328                         }
2329                         if ((ch->flags & CHN_F_EXCLUSIVE) && vpflags == 0) {
2330                                 if (c->flags & CHN_F_VCHAN_ADAPTIVE) {
2331                                         bestspeed = ch->speed;
2332                                         RANGE(bestspeed, caps->minspeed,
2333                                             caps->maxspeed);
2334                                         besthwformat = snd_fmtbest(ch->format,
2335                                             caps->fmtlist);
2336                                         if (besthwformat != 0)
2337                                                 bestformat = besthwformat;
2338                                 }
2339                                 CHN_UNLOCK(ch);
2340                                 vpflags = CHN_F_EXCLUSIVE;
2341                                 nrun++;
2342                                 continue;
2343                         }
2344                         if (!(c->flags & CHN_F_VCHAN_ADAPTIVE) ||
2345                             vpflags != 0) {
2346                                 CHN_UNLOCK(ch);
2347                                 nrun++;
2348                                 continue;
2349                         }
2350                         if (ch->speed > bestspeed) {
2351                                 bestspeed = ch->speed;
2352                                 RANGE(bestspeed, caps->minspeed,
2353                                     caps->maxspeed);
2354                         }
2355                         besthwformat = snd_fmtbest(ch->format, caps->fmtlist);
2356                         if (!(besthwformat & AFMT_VCHAN)) {
2357                                 CHN_UNLOCK(ch);
2358                                 nrun++;
2359                                 continue;
2360                         }
2361                         if (AFMT_CHANNEL(besthwformat) >
2362                             AFMT_CHANNEL(bestformat))
2363                                 bestformat = besthwformat;
2364                         else if (AFMT_CHANNEL(besthwformat) ==
2365                             AFMT_CHANNEL(bestformat) &&
2366                             AFMT_BIT(besthwformat) > AFMT_BIT(bestformat))
2367                                 bestformat = besthwformat;
2368                         CHN_UNLOCK(ch);
2369                         nrun++;
2370                 }
2371
2372                 if (bestformat == 0)
2373                         bestformat = c->format;
2374                 if (bestspeed == 0)
2375                         bestspeed = c->speed;
2376
2377                 if (bestformat != c->format || bestspeed != c->speed)
2378                         dirty = 1;
2379
2380                 c->flags &= ~(CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE);
2381                 c->flags |= vpflags;
2382
2383                 if (nrun && !run) {
2384                         if (dirty) {
2385                                 bestspeed = CHANNEL_SETSPEED(c->methods,
2386                                     c->devinfo, bestspeed);
2387                                 err = chn_reset(c, bestformat, bestspeed);
2388                         }
2389                         if (err == 0 && dirty) {
2390                                 CHN_FOREACH(ch, c, children.busy) {
2391                                         CHN_LOCK(ch);
2392                                         if (VCHAN_SYNC_REQUIRED(ch))
2393                                                 vchan_sync(ch);
2394                                         CHN_UNLOCK(ch);
2395                                 }
2396                         }
2397                         if (err == 0) {
2398                                 if (dirty)
2399                                         c->flags |= CHN_F_DIRTY;
2400                                 err = chn_start(c, 1);
2401                         }
2402                 }
2403
2404                 if (nrun && run && dirty) {
2405                         chn_abort(c);
2406                         bestspeed = CHANNEL_SETSPEED(c->methods, c->devinfo,
2407                             bestspeed);
2408                         err = chn_reset(c, bestformat, bestspeed);
2409                         if (err == 0) {
2410                                 CHN_FOREACH(ch, c, children.busy) {
2411                                         CHN_LOCK(ch);
2412                                         if (VCHAN_SYNC_REQUIRED(ch))
2413                                                 vchan_sync(ch);
2414                                         CHN_UNLOCK(ch);
2415                                 }
2416                         }
2417                         if (err == 0) {
2418                                 c->flags |= CHN_F_DIRTY;
2419                                 err = chn_start(c, 1);
2420                         }
2421                 }
2422
2423                 if (err == 0 && !(bestformat & AFMT_PASSTHROUGH) &&
2424                     (bestformat & AFMT_VCHAN)) {
2425                         *vchanformat = bestformat;
2426                         *vchanrate = bestspeed;
2427                 }
2428
2429                 if (!nrun && run) {
2430                         c->flags &= ~(CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE);
2431                         bestformat = *vchanformat;
2432                         bestspeed = *vchanrate;
2433                         chn_abort(c);
2434                         if (c->format != bestformat || c->speed != bestspeed)
2435                                 chn_reset(c, bestformat, bestspeed);
2436                 }
2437         }
2438
2439         return (err);
2440 }
2441
2442 /**
2443  * @brief Fetch array of supported discrete sample rates
2444  *
2445  * Wrapper for CHANNEL_GETRATES.  Please see channel_if.m:getrates() for
2446  * detailed information.
2447  *
2448  * @note If the operation isn't supported, this function will just return 0
2449  *       (no rates in the array), and *rates will be set to NULL.  Callers
2450  *       should examine rates @b only if this function returns non-zero.
2451  *
2452  * @param c     pcm channel to examine
2453  * @param rates pointer to array of integers; rate table will be recorded here
2454  *
2455  * @return number of rates in the array pointed to be @c rates
2456  */
2457 int
2458 chn_getrates(struct pcm_channel *c, int **rates)
2459 {
2460         KASSERT(rates != NULL, ("rates is null"));
2461         CHN_LOCKASSERT(c);
2462         return CHANNEL_GETRATES(c->methods, c->devinfo, rates);
2463 }
2464
2465 /**
2466  * @brief Remove channel from a sync group, if there is one.
2467  *
2468  * This function is initially intended for the following conditions:
2469  *   - Starting a syncgroup (@c SNDCTL_DSP_SYNCSTART ioctl)
2470  *   - Closing a device.  (A channel can't be destroyed if it's still in use.)
2471  *
2472  * @note Before calling this function, the syncgroup list mutex must be
2473  * held.  (Consider pcm_channel::sm protected by the SG list mutex
2474  * whether @c c is locked or not.)
2475  *
2476  * @param c     channel device to be started or closed
2477  * @returns     If this channel was the only member of a group, the group ID
2478  *              is returned to the caller so that the caller can release it
2479  *              via free_unr() after giving up the syncgroup lock.  Else it
2480  *              returns 0.
2481  */
2482 int
2483 chn_syncdestroy(struct pcm_channel *c)
2484 {
2485         struct pcmchan_syncmember *sm;
2486         struct pcmchan_syncgroup *sg;
2487         int sg_id;
2488
2489         sg_id = 0;
2490
2491         PCM_SG_LOCKASSERT(MA_OWNED);
2492
2493         if (c->sm != NULL) {
2494                 sm = c->sm;
2495                 sg = sm->parent;
2496                 c->sm = NULL;
2497
2498                 KASSERT(sg != NULL, ("syncmember has null parent"));
2499
2500                 SLIST_REMOVE(&sg->members, sm, pcmchan_syncmember, link);
2501                 free(sm, M_DEVBUF);
2502
2503                 if (SLIST_EMPTY(&sg->members)) {
2504                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2505                         sg_id = sg->id;
2506                         free(sg, M_DEVBUF);
2507                 }
2508         }
2509
2510         return sg_id;
2511 }
2512
2513 #ifdef OSSV4_EXPERIMENT
2514 int
2515 chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak)
2516 {
2517         CHN_LOCKASSERT(c);
2518         return CHANNEL_GETPEAKS(c->methods, c->devinfo, lpeak, rpeak);
2519 }
2520 #endif