The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/channel.c

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    1 /*-
    2  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
    4  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
    5  * Portions Copyright (c) Luigi Rizzo <luigi@FreeBSD.org> - 1997-99
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include "opt_isa.h"
   31 
   32 #ifdef HAVE_KERNEL_OPTION_HEADERS
   33 #include "opt_snd.h"
   34 #endif
   35 
   36 #include <dev/sound/pcm/sound.h>
   37 #include <dev/sound/pcm/vchan.h>
   38 
   39 #include "feeder_if.h"
   40 
   41 SND_DECLARE_FILE("$FreeBSD: releng/10.4/sys/dev/sound/pcm/channel.c 283950 2015-06-03 15:32:43Z hselasky $");
   42 
   43 int report_soft_formats = 1;
   44 SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_formats, CTLFLAG_RW,
   45         &report_soft_formats, 1, "report software-emulated formats");
   46 
   47 int report_soft_matrix = 1;
   48 SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_matrix, CTLFLAG_RW,
   49         &report_soft_matrix, 1, "report software-emulated channel matrixing");
   50 
   51 int chn_latency = CHN_LATENCY_DEFAULT;
   52 TUNABLE_INT("hw.snd.latency", &chn_latency);
   53 
   54 static int
   55 sysctl_hw_snd_latency(SYSCTL_HANDLER_ARGS)
   56 {
   57         int err, val;
   58 
   59         val = chn_latency;
   60         err = sysctl_handle_int(oidp, &val, 0, req);
   61         if (err != 0 || req->newptr == NULL)
   62                 return err;
   63         if (val < CHN_LATENCY_MIN || val > CHN_LATENCY_MAX)
   64                 err = EINVAL;
   65         else
   66                 chn_latency = val;
   67 
   68         return err;
   69 }
   70 SYSCTL_PROC(_hw_snd, OID_AUTO, latency, CTLTYPE_INT | CTLFLAG_RW,
   71         0, sizeof(int), sysctl_hw_snd_latency, "I",
   72         "buffering latency (0=low ... 10=high)");
   73 
   74 int chn_latency_profile = CHN_LATENCY_PROFILE_DEFAULT;
   75 TUNABLE_INT("hw.snd.latency_profile", &chn_latency_profile);
   76 
   77 static int
   78 sysctl_hw_snd_latency_profile(SYSCTL_HANDLER_ARGS)
   79 {
   80         int err, val;
   81 
   82         val = chn_latency_profile;
   83         err = sysctl_handle_int(oidp, &val, 0, req);
   84         if (err != 0 || req->newptr == NULL)
   85                 return err;
   86         if (val < CHN_LATENCY_PROFILE_MIN || val > CHN_LATENCY_PROFILE_MAX)
   87                 err = EINVAL;
   88         else
   89                 chn_latency_profile = val;
   90 
   91         return err;
   92 }
   93 SYSCTL_PROC(_hw_snd, OID_AUTO, latency_profile, CTLTYPE_INT | CTLFLAG_RW,
   94         0, sizeof(int), sysctl_hw_snd_latency_profile, "I",
   95         "buffering latency profile (0=aggresive 1=safe)");
   96 
   97 static int chn_timeout = CHN_TIMEOUT;
   98 TUNABLE_INT("hw.snd.timeout", &chn_timeout);
   99 #ifdef SND_DEBUG
  100 static int
  101 sysctl_hw_snd_timeout(SYSCTL_HANDLER_ARGS)
  102 {
  103         int err, val;
  104 
  105         val = chn_timeout;
  106         err = sysctl_handle_int(oidp, &val, 0, req);
  107         if (err != 0 || req->newptr == NULL)
  108                 return err;
  109         if (val < CHN_TIMEOUT_MIN || val > CHN_TIMEOUT_MAX)
  110                 err = EINVAL;
  111         else
  112                 chn_timeout = val;
  113 
  114         return err;
  115 }
  116 SYSCTL_PROC(_hw_snd, OID_AUTO, timeout, CTLTYPE_INT | CTLFLAG_RW,
  117         0, sizeof(int), sysctl_hw_snd_timeout, "I",
  118         "interrupt timeout (1 - 10) seconds");
  119 #endif
  120 
  121 static int chn_vpc_autoreset = 1;
  122 TUNABLE_INT("hw.snd.vpc_autoreset", &chn_vpc_autoreset);
  123 SYSCTL_INT(_hw_snd, OID_AUTO, vpc_autoreset, CTLFLAG_RW,
  124         &chn_vpc_autoreset, 0, "automatically reset channels volume to 0db");
  125 
  126 static int chn_vol_0db_pcm = SND_VOL_0DB_PCM;
  127 TUNABLE_INT("hw.snd.vpc_0db", &chn_vol_0db_pcm);
  128 
  129 static void
  130 chn_vpc_proc(int reset, int db)
  131 {
  132         struct snddev_info *d;
  133         struct pcm_channel *c;
  134         int i;
  135 
  136         for (i = 0; pcm_devclass != NULL &&
  137             i < devclass_get_maxunit(pcm_devclass); i++) {
  138                 d = devclass_get_softc(pcm_devclass, i);
  139                 if (!PCM_REGISTERED(d))
  140                         continue;
  141                 PCM_LOCK(d);
  142                 PCM_WAIT(d);
  143                 PCM_ACQUIRE(d);
  144                 CHN_FOREACH(c, d, channels.pcm) {
  145                         CHN_LOCK(c);
  146                         CHN_SETVOLUME(c, SND_VOL_C_PCM, SND_CHN_T_VOL_0DB, db);
  147                         if (reset != 0)
  148                                 chn_vpc_reset(c, SND_VOL_C_PCM, 1);
  149                         CHN_UNLOCK(c);
  150                 }
  151                 PCM_RELEASE(d);
  152                 PCM_UNLOCK(d);
  153         }
  154 }
  155 
  156 static int
  157 sysctl_hw_snd_vpc_0db(SYSCTL_HANDLER_ARGS)
  158 {
  159         int err, val;
  160 
  161         val = chn_vol_0db_pcm;
  162         err = sysctl_handle_int(oidp, &val, 0, req);
  163         if (err != 0 || req->newptr == NULL)
  164                 return (err);
  165         if (val < SND_VOL_0DB_MIN || val > SND_VOL_0DB_MAX)
  166                 return (EINVAL);
  167 
  168         chn_vol_0db_pcm = val;
  169         chn_vpc_proc(0, val);
  170 
  171         return (0);
  172 }
  173 SYSCTL_PROC(_hw_snd, OID_AUTO, vpc_0db, CTLTYPE_INT | CTLFLAG_RW,
  174         0, sizeof(int), 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, CTLTYPE_INT | CTLFLAG_RW,
  193         0, sizeof(int), sysctl_hw_snd_vpc_reset, "I",
  194         "reset volume on all channels");
  195 
  196 static int chn_usefrags = 0;
  197 TUNABLE_INT("hw.snd.usefrags", &chn_usefrags);
  198 static int chn_syncdelay = -1;
  199 TUNABLE_INT("hw.snd.syncdelay", &chn_syncdelay);
  200 #ifdef SND_DEBUG
  201 SYSCTL_INT(_hw_snd, OID_AUTO, usefrags, CTLFLAG_RW,
  202         &chn_usefrags, 1, "prefer setfragments() over setblocksize()");
  203 SYSCTL_INT(_hw_snd, OID_AUTO, syncdelay, CTLFLAG_RW,
  204         &chn_syncdelay, 1,
  205         "append (0-1000) millisecond trailing buffer delay on each sync");
  206 #endif
  207 
  208 /**
  209  * @brief Channel sync group lock
  210  *
  211  * Clients should acquire this lock @b without holding any channel locks
  212  * before touching syncgroups or the main syncgroup list.
  213  */
  214 struct mtx snd_pcm_syncgroups_mtx;
  215 MTX_SYSINIT(pcm_syncgroup, &snd_pcm_syncgroups_mtx, "PCM channel sync group lock", MTX_DEF);
  216 /**
  217  * @brief syncgroups' master list
  218  *
  219  * Each time a channel syncgroup is created, it's added to this list.  This
  220  * list should only be accessed with @sa snd_pcm_syncgroups_mtx held.
  221  *
  222  * See SNDCTL_DSP_SYNCGROUP for more information.
  223  */
  224 struct pcm_synclist snd_pcm_syncgroups = SLIST_HEAD_INITIALIZER(snd_pcm_syncgroups);
  225 
  226 static void
  227 chn_lockinit(struct pcm_channel *c, int dir)
  228 {
  229         switch (dir) {
  230         case PCMDIR_PLAY:
  231                 c->lock = snd_mtxcreate(c->name, "pcm play channel");
  232                 cv_init(&c->intr_cv, "pcmwr");
  233                 break;
  234         case PCMDIR_PLAY_VIRTUAL:
  235                 c->lock = snd_mtxcreate(c->name, "pcm virtual play channel");
  236                 cv_init(&c->intr_cv, "pcmwrv");
  237                 break;
  238         case PCMDIR_REC:
  239                 c->lock = snd_mtxcreate(c->name, "pcm record channel");
  240                 cv_init(&c->intr_cv, "pcmrd");
  241                 break;
  242         case PCMDIR_REC_VIRTUAL:
  243                 c->lock = snd_mtxcreate(c->name, "pcm virtual record channel");
  244                 cv_init(&c->intr_cv, "pcmrdv");
  245                 break;
  246         default:
  247                 panic("%s(): Invalid direction=%d", __func__, dir);
  248                 break;
  249         }
  250 
  251         cv_init(&c->cv, "pcmchn");
  252 }
  253 
  254 static void
  255 chn_lockdestroy(struct pcm_channel *c)
  256 {
  257         CHN_LOCKASSERT(c);
  258 
  259         CHN_BROADCAST(&c->cv);
  260         CHN_BROADCAST(&c->intr_cv);
  261 
  262         cv_destroy(&c->cv);
  263         cv_destroy(&c->intr_cv);
  264 
  265         snd_mtxfree(c->lock);
  266 }
  267 
  268 /**
  269  * @brief Determine channel is ready for I/O
  270  *
  271  * @retval 1 = ready for I/O
  272  * @retval 0 = not ready for I/O
  273  */
  274 static int
  275 chn_polltrigger(struct pcm_channel *c)
  276 {
  277         struct snd_dbuf *bs = c->bufsoft;
  278         u_int delta;
  279 
  280         CHN_LOCKASSERT(c);
  281 
  282         if (c->flags & CHN_F_MMAP) {
  283                 if (sndbuf_getprevtotal(bs) < c->lw)
  284                         delta = c->lw;
  285                 else
  286                         delta = sndbuf_gettotal(bs) - sndbuf_getprevtotal(bs);
  287         } else {
  288                 if (c->direction == PCMDIR_PLAY)
  289                         delta = sndbuf_getfree(bs);
  290                 else
  291                         delta = sndbuf_getready(bs);
  292         }
  293 
  294         return ((delta < c->lw) ? 0 : 1);
  295 }
  296 
  297 static void
  298 chn_pollreset(struct pcm_channel *c)
  299 {
  300 
  301         CHN_LOCKASSERT(c);
  302         sndbuf_updateprevtotal(c->bufsoft);
  303 }
  304 
  305 static void
  306 chn_wakeup(struct pcm_channel *c)
  307 {
  308         struct snd_dbuf *bs;
  309         struct pcm_channel *ch;
  310 
  311         CHN_LOCKASSERT(c);
  312 
  313         bs = c->bufsoft;
  314 
  315         if (CHN_EMPTY(c, children.busy)) {
  316                 if (SEL_WAITING(sndbuf_getsel(bs)) && chn_polltrigger(c))
  317                         selwakeuppri(sndbuf_getsel(bs), PRIBIO);
  318                 if (c->flags & CHN_F_SLEEPING) {
  319                         /*
  320                          * Ok, I can just panic it right here since it is
  321                          * quite obvious that we never allow multiple waiters
  322                          * from userland. I'm too generous...
  323                          */
  324                         CHN_BROADCAST(&c->intr_cv);
  325                 }
  326         } else {
  327                 CHN_FOREACH(ch, c, children.busy) {
  328                         CHN_LOCK(ch);
  329                         chn_wakeup(ch);
  330                         CHN_UNLOCK(ch);
  331                 }
  332         }
  333 }
  334 
  335 static int
  336 chn_sleep(struct pcm_channel *c, int timeout)
  337 {
  338         int ret;
  339 
  340         CHN_LOCKASSERT(c);
  341 
  342         if (c->flags & CHN_F_DEAD)
  343                 return (EINVAL);
  344 
  345         c->flags |= CHN_F_SLEEPING;
  346         ret = cv_timedwait_sig(&c->intr_cv, c->lock, timeout);
  347         c->flags &= ~CHN_F_SLEEPING;
  348 
  349         return ((c->flags & CHN_F_DEAD) ? EINVAL : ret);
  350 }
  351 
  352 /*
  353  * chn_dmaupdate() tracks the status of a dma transfer,
  354  * updating pointers.
  355  */
  356 
  357 static unsigned int
  358 chn_dmaupdate(struct pcm_channel *c)
  359 {
  360         struct snd_dbuf *b = c->bufhard;
  361         unsigned int delta, old, hwptr, amt;
  362 
  363         KASSERT(sndbuf_getsize(b) > 0, ("bufsize == 0"));
  364         CHN_LOCKASSERT(c);
  365 
  366         old = sndbuf_gethwptr(b);
  367         hwptr = chn_getptr(c);
  368         delta = (sndbuf_getsize(b) + hwptr - old) % sndbuf_getsize(b);
  369         sndbuf_sethwptr(b, hwptr);
  370 
  371         if (c->direction == PCMDIR_PLAY) {
  372                 amt = min(delta, sndbuf_getready(b));
  373                 amt -= amt % sndbuf_getalign(b);
  374                 if (amt > 0)
  375                         sndbuf_dispose(b, NULL, amt);
  376         } else {
  377                 amt = min(delta, sndbuf_getfree(b));
  378                 amt -= amt % sndbuf_getalign(b);
  379                 if (amt > 0)
  380                        sndbuf_acquire(b, NULL, amt);
  381         }
  382         if (snd_verbose > 3 && CHN_STARTED(c) && delta == 0) {
  383                 device_printf(c->dev, "WARNING: %s DMA completion "
  384                         "too fast/slow ! hwptr=%u, old=%u "
  385                         "delta=%u amt=%u ready=%u free=%u\n",
  386                         CHN_DIRSTR(c), hwptr, old, delta, amt,
  387                         sndbuf_getready(b), sndbuf_getfree(b));
  388         }
  389 
  390         return delta;
  391 }
  392 
  393 static void
  394 chn_wrfeed(struct pcm_channel *c)
  395 {
  396         struct snd_dbuf *b = c->bufhard;
  397         struct snd_dbuf *bs = c->bufsoft;
  398         unsigned int amt, want, wasfree;
  399 
  400         CHN_LOCKASSERT(c);
  401 
  402         if ((c->flags & CHN_F_MMAP) && !(c->flags & CHN_F_CLOSING))
  403                 sndbuf_acquire(bs, NULL, sndbuf_getfree(bs));
  404 
  405         wasfree = sndbuf_getfree(b);
  406         want = min(sndbuf_getsize(b),
  407             imax(0, sndbuf_xbytes(sndbuf_getsize(bs), bs, b) -
  408              sndbuf_getready(b)));
  409         amt = min(wasfree, want);
  410         if (amt > 0)
  411                 sndbuf_feed(bs, b, c, c->feeder, amt);
  412 
  413         /*
  414          * Possible xruns. There should be no empty space left in buffer.
  415          */
  416         if (sndbuf_getready(b) < want)
  417                 c->xruns++;
  418 
  419         if (sndbuf_getfree(b) < wasfree)
  420                 chn_wakeup(c);
  421 }
  422 
  423 #if 0
  424 static void
  425 chn_wrupdate(struct pcm_channel *c)
  426 {
  427 
  428         CHN_LOCKASSERT(c);
  429         KASSERT(c->direction == PCMDIR_PLAY, ("%s(): bad channel", __func__));
  430 
  431         if ((c->flags & (CHN_F_MMAP | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
  432                 return;
  433         chn_dmaupdate(c);
  434         chn_wrfeed(c);
  435         /* tell the driver we've updated the primary buffer */
  436         chn_trigger(c, PCMTRIG_EMLDMAWR);
  437 }
  438 #endif
  439 
  440 static void
  441 chn_wrintr(struct pcm_channel *c)
  442 {
  443 
  444         CHN_LOCKASSERT(c);
  445         /* update pointers in primary buffer */
  446         chn_dmaupdate(c);
  447         /* ...and feed from secondary to primary */
  448         chn_wrfeed(c);
  449         /* tell the driver we've updated the primary buffer */
  450         chn_trigger(c, PCMTRIG_EMLDMAWR);
  451 }
  452 
  453 /*
  454  * user write routine - uiomove data into secondary buffer, trigger if necessary
  455  * if blocking, sleep, rinse and repeat.
  456  *
  457  * called externally, so must handle locking
  458  */
  459 
  460 int
  461 chn_write(struct pcm_channel *c, struct uio *buf)
  462 {
  463         struct snd_dbuf *bs = c->bufsoft;
  464         void *off;
  465         int ret, timeout, sz, t, p;
  466 
  467         CHN_LOCKASSERT(c);
  468 
  469         ret = 0;
  470         timeout = chn_timeout * hz;
  471 
  472         while (ret == 0 && buf->uio_resid > 0) {
  473                 sz = min(buf->uio_resid, sndbuf_getfree(bs));
  474                 if (sz > 0) {
  475                         /*
  476                          * The following assumes that the free space in
  477                          * the buffer can never be less around the
  478                          * unlock-uiomove-lock sequence.
  479                          */
  480                         while (ret == 0 && sz > 0) {
  481                                 p = sndbuf_getfreeptr(bs);
  482                                 t = min(sz, sndbuf_getsize(bs) - p);
  483                                 off = sndbuf_getbufofs(bs, p);
  484                                 CHN_UNLOCK(c);
  485                                 ret = uiomove(off, t, buf);
  486                                 CHN_LOCK(c);
  487                                 sz -= t;
  488                                 sndbuf_acquire(bs, NULL, t);
  489                         }
  490                         ret = 0;
  491                         if (CHN_STOPPED(c) && !(c->flags & CHN_F_NOTRIGGER)) {
  492                                 ret = chn_start(c, 0);
  493                                 if (ret != 0)
  494                                         c->flags |= CHN_F_DEAD;
  495                         }
  496                 } else if (c->flags & (CHN_F_NBIO | CHN_F_NOTRIGGER)) {
  497                         /**
  498                          * @todo Evaluate whether EAGAIN is truly desirable.
  499                          *       4Front drivers behave like this, but I'm
  500                          *       not sure if it at all violates the "write
  501                          *       should be allowed to block" model.
  502                          *
  503                          *       The idea is that, while set with CHN_F_NOTRIGGER,
  504                          *       a channel isn't playing, *but* without this we
  505                          *       end up with "interrupt timeout / channel dead".
  506                          */
  507                         ret = EAGAIN;
  508                 } else {
  509                         ret = chn_sleep(c, timeout);
  510                         if (ret == EAGAIN) {
  511                                 ret = EINVAL;
  512                                 c->flags |= CHN_F_DEAD;
  513                                 device_printf(c->dev, "%s(): %s: "
  514                                     "play interrupt timeout, channel dead\n",
  515                                     __func__, c->name);
  516                         } else if (ret == ERESTART || ret == EINTR)
  517                                 c->flags |= CHN_F_ABORTING;
  518                 }
  519         }
  520 
  521         return (ret);
  522 }
  523 
  524 /*
  525  * Feed new data from the read buffer. Can be called in the bottom half.
  526  */
  527 static void
  528 chn_rdfeed(struct pcm_channel *c)
  529 {
  530         struct snd_dbuf *b = c->bufhard;
  531         struct snd_dbuf *bs = c->bufsoft;
  532         unsigned int amt;
  533 
  534         CHN_LOCKASSERT(c);
  535 
  536         if (c->flags & CHN_F_MMAP)
  537                 sndbuf_dispose(bs, NULL, sndbuf_getready(bs));
  538 
  539         amt = sndbuf_getfree(bs);
  540         if (amt > 0)
  541                 sndbuf_feed(b, bs, c, c->feeder, amt);
  542 
  543         amt = sndbuf_getready(b);
  544         if (amt > 0) {
  545                 c->xruns++;
  546                 sndbuf_dispose(b, NULL, amt);
  547         }
  548 
  549         if (sndbuf_getready(bs) > 0)
  550                 chn_wakeup(c);
  551 }
  552 
  553 #if 0
  554 static void
  555 chn_rdupdate(struct pcm_channel *c)
  556 {
  557 
  558         CHN_LOCKASSERT(c);
  559         KASSERT(c->direction == PCMDIR_REC, ("chn_rdupdate on bad channel"));
  560 
  561         if ((c->flags & (CHN_F_MMAP | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
  562                 return;
  563         chn_trigger(c, PCMTRIG_EMLDMARD);
  564         chn_dmaupdate(c);
  565         chn_rdfeed(c);
  566 }
  567 #endif
  568 
  569 /* read interrupt routine. Must be called with interrupts blocked. */
  570 static void
  571 chn_rdintr(struct pcm_channel *c)
  572 {
  573 
  574         CHN_LOCKASSERT(c);
  575         /* tell the driver to update the primary buffer if non-dma */
  576         chn_trigger(c, PCMTRIG_EMLDMARD);
  577         /* update pointers in primary buffer */
  578         chn_dmaupdate(c);
  579         /* ...and feed from primary to secondary */
  580         chn_rdfeed(c);
  581 }
  582 
  583 /*
  584  * user read routine - trigger if necessary, uiomove data from secondary buffer
  585  * if blocking, sleep, rinse and repeat.
  586  *
  587  * called externally, so must handle locking
  588  */
  589 
  590 int
  591 chn_read(struct pcm_channel *c, struct uio *buf)
  592 {
  593         struct snd_dbuf *bs = c->bufsoft;
  594         void *off;
  595         int ret, timeout, sz, t, p;
  596 
  597         CHN_LOCKASSERT(c);
  598 
  599         if (CHN_STOPPED(c) && !(c->flags & CHN_F_NOTRIGGER)) {
  600                 ret = chn_start(c, 0);
  601                 if (ret != 0) {
  602                         c->flags |= CHN_F_DEAD;
  603                         return (ret);
  604                 }
  605         }
  606 
  607         ret = 0;
  608         timeout = chn_timeout * hz;
  609 
  610         while (ret == 0 && buf->uio_resid > 0) {
  611                 sz = min(buf->uio_resid, sndbuf_getready(bs));
  612                 if (sz > 0) {
  613                         /*
  614                          * The following assumes that the free space in
  615                          * the buffer can never be less around the
  616                          * unlock-uiomove-lock sequence.
  617                          */
  618                         while (ret == 0 && sz > 0) {
  619                                 p = sndbuf_getreadyptr(bs);
  620                                 t = min(sz, sndbuf_getsize(bs) - p);
  621                                 off = sndbuf_getbufofs(bs, p);
  622                                 CHN_UNLOCK(c);
  623                                 ret = uiomove(off, t, buf);
  624                                 CHN_LOCK(c);
  625                                 sz -= t;
  626                                 sndbuf_dispose(bs, NULL, t);
  627                         }
  628                         ret = 0;
  629                 } else if (c->flags & (CHN_F_NBIO | CHN_F_NOTRIGGER))
  630                         ret = EAGAIN;
  631                 else {
  632                         ret = chn_sleep(c, timeout);
  633                         if (ret == EAGAIN) {
  634                                 ret = EINVAL;
  635                                 c->flags |= CHN_F_DEAD;
  636                                 device_printf(c->dev, "%s(): %s: "
  637                                     "record interrupt timeout, channel dead\n",
  638                                     __func__, c->name);
  639                         } else if (ret == ERESTART || ret == EINTR)
  640                                 c->flags |= CHN_F_ABORTING;
  641                 }
  642         }
  643 
  644         return (ret);
  645 }
  646 
  647 void
  648 chn_intr_locked(struct pcm_channel *c)
  649 {
  650 
  651         CHN_LOCKASSERT(c);
  652 
  653         c->interrupts++;
  654 
  655         if (c->direction == PCMDIR_PLAY)
  656                 chn_wrintr(c);
  657         else
  658                 chn_rdintr(c);
  659 }
  660 
  661 void
  662 chn_intr(struct pcm_channel *c)
  663 {
  664 
  665         if (CHN_LOCKOWNED(c)) {
  666                 chn_intr_locked(c);
  667                 return;
  668         }
  669 
  670         CHN_LOCK(c);
  671         chn_intr_locked(c);
  672         CHN_UNLOCK(c);
  673 }
  674 
  675 u_int32_t
  676 chn_start(struct pcm_channel *c, int force)
  677 {
  678         u_int32_t i, j;
  679         struct snd_dbuf *b = c->bufhard;
  680         struct snd_dbuf *bs = c->bufsoft;
  681         int err;
  682 
  683         CHN_LOCKASSERT(c);
  684         /* if we're running, or if we're prevented from triggering, bail */
  685         if (CHN_STARTED(c) || ((c->flags & CHN_F_NOTRIGGER) && !force))
  686                 return (EINVAL);
  687 
  688         err = 0;
  689 
  690         if (force) {
  691                 i = 1;
  692                 j = 0;
  693         } else {
  694                 if (c->direction == PCMDIR_REC) {
  695                         i = sndbuf_getfree(bs);
  696                         j = (i > 0) ? 1 : sndbuf_getready(b);
  697                 } else {
  698                         if (sndbuf_getfree(bs) == 0) {
  699                                 i = 1;
  700                                 j = 0;
  701                         } else {
  702                                 struct snd_dbuf *pb;
  703 
  704                                 pb = CHN_BUF_PARENT(c, b);
  705                                 i = sndbuf_xbytes(sndbuf_getready(bs), bs, pb);
  706                                 j = sndbuf_getalign(pb);
  707                         }
  708                 }
  709                 if (snd_verbose > 3 && CHN_EMPTY(c, children))
  710                         device_printf(c->dev, "%s(): %s (%s) threshold "
  711                             "i=%d j=%d\n", __func__, CHN_DIRSTR(c),
  712                             (c->flags & CHN_F_VIRTUAL) ? "virtual" :
  713                             "hardware", i, j);
  714         }
  715 
  716         if (i >= j) {
  717                 c->flags |= CHN_F_TRIGGERED;
  718                 sndbuf_setrun(b, 1);
  719                 if (c->flags & CHN_F_CLOSING)
  720                         c->feedcount = 2;
  721                 else {
  722                         c->feedcount = 0;
  723                         c->interrupts = 0;
  724                         c->xruns = 0;
  725                 }
  726                 if (c->parentchannel == NULL) {
  727                         if (c->direction == PCMDIR_PLAY)
  728                                 sndbuf_fillsilence_rl(b,
  729                                     sndbuf_xbytes(sndbuf_getsize(bs), bs, b));
  730                         if (snd_verbose > 3)
  731                                 device_printf(c->dev,
  732                                     "%s(): %s starting! (%s/%s) "
  733                                     "(ready=%d force=%d i=%d j=%d "
  734                                     "intrtimeout=%u latency=%dms)\n",
  735                                     __func__,
  736                                     (c->flags & CHN_F_HAS_VCHAN) ?
  737                                     "VCHAN PARENT" : "HW", CHN_DIRSTR(c),
  738                                     (c->flags & CHN_F_CLOSING) ? "closing" :
  739                                     "running",
  740                                     sndbuf_getready(b),
  741                                     force, i, j, c->timeout,
  742                                     (sndbuf_getsize(b) * 1000) /
  743                                     (sndbuf_getalign(b) * sndbuf_getspd(b)));
  744                 }
  745                 err = chn_trigger(c, PCMTRIG_START);
  746         }
  747 
  748         return (err);
  749 }
  750 
  751 void
  752 chn_resetbuf(struct pcm_channel *c)
  753 {
  754         struct snd_dbuf *b = c->bufhard;
  755         struct snd_dbuf *bs = c->bufsoft;
  756 
  757         c->blocks = 0;
  758         sndbuf_reset(b);
  759         sndbuf_reset(bs);
  760 }
  761 
  762 /*
  763  * chn_sync waits until the space in the given channel goes above
  764  * a threshold. The threshold is checked against fl or rl respectively.
  765  * Assume that the condition can become true, do not check here...
  766  */
  767 int
  768 chn_sync(struct pcm_channel *c, int threshold)
  769 {
  770         struct snd_dbuf *b, *bs;
  771         int ret, count, hcount, minflush, resid, residp, syncdelay, blksz;
  772         u_int32_t cflag;
  773 
  774         CHN_LOCKASSERT(c);
  775 
  776         if (c->direction != PCMDIR_PLAY)
  777                 return (EINVAL);
  778 
  779         bs = c->bufsoft;
  780 
  781         if ((c->flags & (CHN_F_DEAD | CHN_F_ABORTING)) ||
  782             (threshold < 1 && sndbuf_getready(bs) < 1))
  783                 return (0);
  784 
  785         /* if we haven't yet started and nothing is buffered, else start*/
  786         if (CHN_STOPPED(c)) {
  787                 if (threshold > 0 || sndbuf_getready(bs) > 0) {
  788                         ret = chn_start(c, 1);
  789                         if (ret != 0)
  790                                 return (ret);
  791                 } else
  792                         return (0);
  793         }
  794 
  795         b = CHN_BUF_PARENT(c, c->bufhard);
  796 
  797         minflush = threshold + sndbuf_xbytes(sndbuf_getready(b), b, bs);
  798 
  799         syncdelay = chn_syncdelay;
  800 
  801         if (syncdelay < 0 && (threshold > 0 || sndbuf_getready(bs) > 0))
  802                 minflush += sndbuf_xbytes(sndbuf_getsize(b), b, bs);
  803 
  804         /*
  805          * Append (0-1000) millisecond trailing buffer (if needed)
  806          * for slower / high latency hardwares (notably USB audio)
  807          * to avoid audible truncation.
  808          */
  809         if (syncdelay > 0)
  810                 minflush += (sndbuf_getalign(bs) * sndbuf_getspd(bs) *
  811                     ((syncdelay > 1000) ? 1000 : syncdelay)) / 1000;
  812 
  813         minflush -= minflush % sndbuf_getalign(bs);
  814 
  815         if (minflush > 0) {
  816                 threshold = min(minflush, sndbuf_getfree(bs));
  817                 sndbuf_clear(bs, threshold);
  818                 sndbuf_acquire(bs, NULL, threshold);
  819                 minflush -= threshold;
  820         }
  821 
  822         resid = sndbuf_getready(bs);
  823         residp = resid;
  824         blksz = sndbuf_getblksz(b);
  825         if (blksz < 1) {
  826                 device_printf(c->dev,
  827                     "%s(): WARNING: blksz < 1 ! maxsize=%d [%d/%d/%d]\n",
  828                     __func__, sndbuf_getmaxsize(b), sndbuf_getsize(b),
  829                     sndbuf_getblksz(b), sndbuf_getblkcnt(b));
  830                 if (sndbuf_getblkcnt(b) > 0)
  831                         blksz = sndbuf_getsize(b) / sndbuf_getblkcnt(b);
  832                 if (blksz < 1)
  833                         blksz = 1;
  834         }
  835         count = sndbuf_xbytes(minflush + resid, bs, b) / blksz;
  836         hcount = count;
  837         ret = 0;
  838 
  839         if (snd_verbose > 3)
  840                 device_printf(c->dev, "%s(): [begin] timeout=%d count=%d "
  841                     "minflush=%d resid=%d\n", __func__, c->timeout, count,
  842                     minflush, resid);
  843 
  844         cflag = c->flags & CHN_F_CLOSING;
  845         c->flags |= CHN_F_CLOSING;
  846         while (count > 0 && (resid > 0 || minflush > 0)) {
  847                 ret = chn_sleep(c, c->timeout);
  848                 if (ret == ERESTART || ret == EINTR) {
  849                         c->flags |= CHN_F_ABORTING;
  850                         break;
  851                 } else if (ret == 0 || ret == EAGAIN) {
  852                         resid = sndbuf_getready(bs);
  853                         if (resid == residp) {
  854                                 --count;
  855                                 if (snd_verbose > 3)
  856                                         device_printf(c->dev,
  857                                             "%s(): [stalled] timeout=%d "
  858                                             "count=%d hcount=%d "
  859                                             "resid=%d minflush=%d\n",
  860                                             __func__, c->timeout, count,
  861                                             hcount, resid, minflush);
  862                         } else if (resid < residp && count < hcount) {
  863                                 ++count;
  864                                 if (snd_verbose > 3)
  865                                         device_printf(c->dev,
  866                                             "%s((): [resume] timeout=%d "
  867                                             "count=%d hcount=%d "
  868                                             "resid=%d minflush=%d\n",
  869                                             __func__, c->timeout, count,
  870                                             hcount, resid, minflush);
  871                         }
  872                         if (minflush > 0 && sndbuf_getfree(bs) > 0) {
  873                                 threshold = min(minflush,
  874                                     sndbuf_getfree(bs));
  875                                 sndbuf_clear(bs, threshold);
  876                                 sndbuf_acquire(bs, NULL, threshold);
  877                                 resid = sndbuf_getready(bs);
  878                                 minflush -= threshold;
  879                         }
  880                         residp = resid;
  881                 } else
  882                         break;
  883         }
  884         c->flags &= ~CHN_F_CLOSING;
  885         c->flags |= cflag;
  886 
  887         if (snd_verbose > 3)
  888                 device_printf(c->dev,
  889                     "%s(): timeout=%d count=%d hcount=%d resid=%d residp=%d "
  890                     "minflush=%d ret=%d\n",
  891                     __func__, c->timeout, count, hcount, resid, residp,
  892                     minflush, ret);
  893 
  894         return (0);
  895 }
  896 
  897 /* called externally, handle locking */
  898 int
  899 chn_poll(struct pcm_channel *c, int ev, struct thread *td)
  900 {
  901         struct snd_dbuf *bs = c->bufsoft;
  902         int ret;
  903 
  904         CHN_LOCKASSERT(c);
  905 
  906         if (!(c->flags & (CHN_F_MMAP | CHN_F_TRIGGERED))) {
  907                 ret = chn_start(c, 1);
  908                 if (ret != 0)
  909                         return (0);
  910         }
  911 
  912         ret = 0;
  913         if (chn_polltrigger(c)) {
  914                 chn_pollreset(c);
  915                 ret = ev;
  916         } else
  917                 selrecord(td, sndbuf_getsel(bs));
  918 
  919         return (ret);
  920 }
  921 
  922 /*
  923  * chn_abort terminates a running dma transfer.  it may sleep up to 200ms.
  924  * it returns the number of bytes that have not been transferred.
  925  *
  926  * called from: dsp_close, dsp_ioctl, with channel locked
  927  */
  928 int
  929 chn_abort(struct pcm_channel *c)
  930 {
  931         int missing = 0;
  932         struct snd_dbuf *b = c->bufhard;
  933         struct snd_dbuf *bs = c->bufsoft;
  934 
  935         CHN_LOCKASSERT(c);
  936         if (CHN_STOPPED(c))
  937                 return 0;
  938         c->flags |= CHN_F_ABORTING;
  939 
  940         c->flags &= ~CHN_F_TRIGGERED;
  941         /* kill the channel */
  942         chn_trigger(c, PCMTRIG_ABORT);
  943         sndbuf_setrun(b, 0);
  944         if (!(c->flags & CHN_F_VIRTUAL))
  945                 chn_dmaupdate(c);
  946         missing = sndbuf_getready(bs);
  947 
  948         c->flags &= ~CHN_F_ABORTING;
  949         return missing;
  950 }
  951 
  952 /*
  953  * this routine tries to flush the dma transfer. It is called
  954  * on a close of a playback channel.
  955  * first, if there is data in the buffer, but the dma has not yet
  956  * begun, we need to start it.
  957  * next, we wait for the play buffer to drain
  958  * finally, we stop the dma.
  959  *
  960  * called from: dsp_close, not valid for record channels.
  961  */
  962 
  963 int
  964 chn_flush(struct pcm_channel *c)
  965 {
  966         struct snd_dbuf *b = c->bufhard;
  967 
  968         CHN_LOCKASSERT(c);
  969         KASSERT(c->direction == PCMDIR_PLAY, ("chn_flush on bad channel"));
  970         DEB(printf("chn_flush: c->flags 0x%08x\n", c->flags));
  971 
  972         c->flags |= CHN_F_CLOSING;
  973         chn_sync(c, 0);
  974         c->flags &= ~CHN_F_TRIGGERED;
  975         /* kill the channel */
  976         chn_trigger(c, PCMTRIG_ABORT);
  977         sndbuf_setrun(b, 0);
  978 
  979         c->flags &= ~CHN_F_CLOSING;
  980         return 0;
  981 }
  982 
  983 int
  984 snd_fmtvalid(uint32_t fmt, uint32_t *fmtlist)
  985 {
  986         int i;
  987 
  988         for (i = 0; fmtlist[i] != 0; i++) {
  989                 if (fmt == fmtlist[i] ||
  990                     ((fmt & AFMT_PASSTHROUGH) &&
  991                     (AFMT_ENCODING(fmt) & fmtlist[i])))
  992                         return (1);
  993         }
  994 
  995         return (0);
  996 }
  997 
  998 static const struct {
  999         char *name, *alias1, *alias2;
 1000         uint32_t afmt;
 1001 } afmt_tab[] = {
 1002         {  "alaw",  NULL, NULL, AFMT_A_LAW  },
 1003         { "mulaw",  NULL, NULL, AFMT_MU_LAW },
 1004         {    "u8",   "8", NULL, AFMT_U8     },
 1005         {    "s8",  NULL, NULL, AFMT_S8     },
 1006 #if BYTE_ORDER == LITTLE_ENDIAN
 1007         { "s16le", "s16", "16", AFMT_S16_LE },
 1008         { "s16be",  NULL, NULL, AFMT_S16_BE },
 1009 #else
 1010         { "s16le",  NULL, NULL, AFMT_S16_LE },
 1011         { "s16be", "s16", "16", AFMT_S16_BE },
 1012 #endif
 1013         { "u16le",  NULL, NULL, AFMT_U16_LE },
 1014         { "u16be",  NULL, NULL, AFMT_U16_BE },
 1015         { "s24le",  NULL, NULL, AFMT_S24_LE },
 1016         { "s24be",  NULL, NULL, AFMT_S24_BE },
 1017         { "u24le",  NULL, NULL, AFMT_U24_LE },
 1018         { "u24be",  NULL, NULL, AFMT_U24_BE },
 1019 #if BYTE_ORDER == LITTLE_ENDIAN
 1020         { "s32le", "s32", "32", AFMT_S32_LE },
 1021         { "s32be",  NULL, NULL, AFMT_S32_BE },
 1022 #else
 1023         { "s32le",  NULL, NULL, AFMT_S32_LE },
 1024         { "s32be", "s32", "32", AFMT_S32_BE },
 1025 #endif
 1026         { "u32le",  NULL, NULL, AFMT_U32_LE },
 1027         { "u32be",  NULL, NULL, AFMT_U32_BE },
 1028         {   "ac3",  NULL, NULL, AFMT_AC3    },
 1029         {    NULL,  NULL, NULL, 0           }
 1030 };
 1031 
 1032 uint32_t
 1033 snd_str2afmt(const char *req)
 1034 {
 1035         int ext;
 1036         int ch;
 1037         int i;
 1038         char b1[8];
 1039         char b2[8];
 1040 
 1041         memset(b1, 0, sizeof(b1));
 1042         memset(b2, 0, sizeof(b2));
 1043 
 1044         i = sscanf(req, "%5[^:]:%6s", b1, b2);
 1045 
 1046         if (i == 1) {
 1047                 if (strlen(req) != strlen(b1))
 1048                         return (0);
 1049                 strlcpy(b2, "2.0", sizeof(b2));
 1050         } else if (i == 2) {
 1051                 if (strlen(req) != (strlen(b1) + 1 + strlen(b2)))
 1052                         return (0);
 1053         } else
 1054                 return (0);
 1055 
 1056         i = sscanf(b2, "%d.%d", &ch, &ext);
 1057 
 1058         if (i == 0) {
 1059                 if (strcasecmp(b2, "mono") == 0) {
 1060                         ch = 1;
 1061                         ext = 0;
 1062                 } else if (strcasecmp(b2, "stereo") == 0) {
 1063                         ch = 2;
 1064                         ext = 0;
 1065                 } else if (strcasecmp(b2, "quad") == 0) {
 1066                         ch = 4;
 1067                         ext = 0;
 1068                 } else
 1069                         return (0);
 1070         } else if (i == 1) {
 1071                 if (ch < 1 || ch > AFMT_CHANNEL_MAX)
 1072                         return (0);
 1073                 ext = 0;
 1074         } else if (i == 2) {
 1075                 if (ext < 0 || ext > AFMT_EXTCHANNEL_MAX)
 1076                         return (0);
 1077                 if (ch < 1 || (ch + ext) > AFMT_CHANNEL_MAX)
 1078                         return (0);
 1079         } else
 1080                 return (0);
 1081 
 1082         for (i = 0; afmt_tab[i].name != NULL; i++) {
 1083                 if (strcasecmp(afmt_tab[i].name, b1) != 0) {
 1084                         if (afmt_tab[i].alias1 == NULL)
 1085                                 continue;
 1086                         if (strcasecmp(afmt_tab[i].alias1, b1) != 0) {
 1087                                 if (afmt_tab[i].alias2 == NULL)
 1088                                         continue;
 1089                                 if (strcasecmp(afmt_tab[i].alias2, b1) != 0)
 1090                                         continue;
 1091                         }
 1092                 }
 1093                 /* found a match */
 1094                 return (SND_FORMAT(afmt_tab[i].afmt, ch + ext, ext));   
 1095         }
 1096         /* not a valid format */
 1097         return (0);
 1098 }
 1099 
 1100 uint32_t
 1101 snd_afmt2str(uint32_t afmt, char *buf, size_t len)
 1102 {
 1103         uint32_t enc;
 1104         uint32_t ext;
 1105         uint32_t ch;
 1106         int i;
 1107 
 1108         if (buf == NULL || len < AFMTSTR_LEN)
 1109                 return (0);
 1110 
 1111         memset(buf, 0, len);
 1112 
 1113         enc = AFMT_ENCODING(afmt);
 1114         ch = AFMT_CHANNEL(afmt);
 1115         ext = AFMT_EXTCHANNEL(afmt);
 1116         /* check there is at least one channel */
 1117         if (ch <= ext)
 1118                 return (0);
 1119         for (i = 0; afmt_tab[i].name != NULL; i++) {
 1120                 if (enc != afmt_tab[i].afmt)
 1121                         continue;
 1122                 /* found a match */
 1123                 snprintf(buf, len, "%s:%d.%d",
 1124                     afmt_tab[i].name, ch - ext, ext);
 1125                 return (SND_FORMAT(enc, ch, ext));
 1126         }
 1127         return (0);
 1128 }
 1129 
 1130 int
 1131 chn_reset(struct pcm_channel *c, uint32_t fmt, uint32_t spd)
 1132 {
 1133         int r;
 1134 
 1135         CHN_LOCKASSERT(c);
 1136         c->feedcount = 0;
 1137         c->flags &= CHN_F_RESET;
 1138         c->interrupts = 0;
 1139         c->timeout = 1;
 1140         c->xruns = 0;
 1141 
 1142         c->flags |= (pcm_getflags(c->dev) & SD_F_BITPERFECT) ?
 1143             CHN_F_BITPERFECT : 0;
 1144 
 1145         r = CHANNEL_RESET(c->methods, c->devinfo);
 1146         if (r == 0 && fmt != 0 && spd != 0) {
 1147                 r = chn_setparam(c, fmt, spd);
 1148                 fmt = 0;
 1149                 spd = 0;
 1150         }
 1151         if (r == 0 && fmt != 0)
 1152                 r = chn_setformat(c, fmt);
 1153         if (r == 0 && spd != 0)
 1154                 r = chn_setspeed(c, spd);
 1155         if (r == 0)
 1156                 r = chn_setlatency(c, chn_latency);
 1157         if (r == 0) {
 1158                 chn_resetbuf(c);
 1159                 r = CHANNEL_RESETDONE(c->methods, c->devinfo);
 1160         }
 1161         return r;
 1162 }
 1163 
 1164 int
 1165 chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction)
 1166 {
 1167         struct feeder_class *fc;
 1168         struct snd_dbuf *b, *bs;
 1169         int i, ret;
 1170 
 1171         if (chn_timeout < CHN_TIMEOUT_MIN || chn_timeout > CHN_TIMEOUT_MAX)
 1172                 chn_timeout = CHN_TIMEOUT;
 1173 
 1174         chn_lockinit(c, dir);
 1175 
 1176         b = NULL;
 1177         bs = NULL;
 1178         CHN_INIT(c, children);
 1179         CHN_INIT(c, children.busy);
 1180         c->devinfo = NULL;
 1181         c->feeder = NULL;
 1182         c->latency = -1;
 1183         c->timeout = 1;
 1184 
 1185         ret = ENOMEM;
 1186         b = sndbuf_create(c->dev, c->name, "primary", c);
 1187         if (b == NULL)
 1188                 goto out;
 1189         bs = sndbuf_create(c->dev, c->name, "secondary", c);
 1190         if (bs == NULL)
 1191                 goto out;
 1192 
 1193         CHN_LOCK(c);
 1194 
 1195         ret = EINVAL;
 1196         fc = feeder_getclass(NULL);
 1197         if (fc == NULL)
 1198                 goto out;
 1199         if (chn_addfeeder(c, fc, NULL))
 1200                 goto out;
 1201 
 1202         /*
 1203          * XXX - sndbuf_setup() & sndbuf_resize() expect to be called
 1204          *       with the channel unlocked because they are also called
 1205          *       from driver methods that don't know about locking
 1206          */
 1207         CHN_UNLOCK(c);
 1208         sndbuf_setup(bs, NULL, 0);
 1209         CHN_LOCK(c);
 1210         c->bufhard = b;
 1211         c->bufsoft = bs;
 1212         c->flags = 0;
 1213         c->feederflags = 0;
 1214         c->sm = NULL;
 1215         c->format = SND_FORMAT(AFMT_U8, 1, 0);
 1216         c->speed = DSP_DEFAULT_SPEED;
 1217 
 1218         c->matrix = *feeder_matrix_id_map(SND_CHN_MATRIX_1_0);
 1219         c->matrix.id = SND_CHN_MATRIX_PCMCHANNEL;
 1220 
 1221         for (i = 0; i < SND_CHN_T_MAX; i++) {
 1222                 c->volume[SND_VOL_C_MASTER][i] = SND_VOL_0DB_MASTER;
 1223         }
 1224 
 1225         c->volume[SND_VOL_C_MASTER][SND_CHN_T_VOL_0DB] = SND_VOL_0DB_MASTER;
 1226         c->volume[SND_VOL_C_PCM][SND_CHN_T_VOL_0DB] = chn_vol_0db_pcm;
 1227 
 1228         chn_vpc_reset(c, SND_VOL_C_PCM, 1);
 1229 
 1230         ret = ENODEV;
 1231         CHN_UNLOCK(c); /* XXX - Unlock for CHANNEL_INIT() malloc() call */
 1232         c->devinfo = CHANNEL_INIT(c->methods, devinfo, b, c, direction);
 1233         CHN_LOCK(c);
 1234         if (c->devinfo == NULL)
 1235                 goto out;
 1236 
 1237         ret = ENOMEM;
 1238         if ((sndbuf_getsize(b) == 0) && ((c->flags & CHN_F_VIRTUAL) == 0))
 1239                 goto out;
 1240 
 1241         ret = 0;
 1242         c->direction = direction;
 1243 
 1244         sndbuf_setfmt(b, c->format);
 1245         sndbuf_setspd(b, c->speed);
 1246         sndbuf_setfmt(bs, c->format);
 1247         sndbuf_setspd(bs, c->speed);
 1248 
 1249         /**
 1250          * @todo Should this be moved somewhere else?  The primary buffer
 1251          *       is allocated by the driver or via DMA map setup, and tmpbuf
 1252          *       seems to only come into existence in sndbuf_resize().
 1253          */
 1254         if (c->direction == PCMDIR_PLAY) {
 1255                 bs->sl = sndbuf_getmaxsize(bs);
 1256                 bs->shadbuf = malloc(bs->sl, M_DEVBUF, M_NOWAIT);
 1257                 if (bs->shadbuf == NULL) {
 1258                         ret = ENOMEM;
 1259                         goto out;
 1260                 }
 1261         }
 1262 
 1263 out:
 1264         CHN_UNLOCK(c);
 1265         if (ret) {
 1266                 if (c->devinfo) {
 1267                         if (CHANNEL_FREE(c->methods, c->devinfo))
 1268                                 sndbuf_free(b);
 1269                 }
 1270                 if (bs)
 1271                         sndbuf_destroy(bs);
 1272                 if (b)
 1273                         sndbuf_destroy(b);
 1274                 CHN_LOCK(c);
 1275                 c->flags |= CHN_F_DEAD;
 1276                 chn_lockdestroy(c);
 1277 
 1278                 return ret;
 1279         }
 1280 
 1281         return 0;
 1282 }
 1283 
 1284 int
 1285 chn_kill(struct pcm_channel *c)
 1286 {
 1287         struct snd_dbuf *b = c->bufhard;
 1288         struct snd_dbuf *bs = c->bufsoft;
 1289 
 1290         if (CHN_STARTED(c)) {
 1291                 CHN_LOCK(c);
 1292                 chn_trigger(c, PCMTRIG_ABORT);
 1293                 CHN_UNLOCK(c);
 1294         }
 1295         while (chn_removefeeder(c) == 0)
 1296                 ;
 1297         if (CHANNEL_FREE(c->methods, c->devinfo))
 1298                 sndbuf_free(b);
 1299         sndbuf_destroy(bs);
 1300         sndbuf_destroy(b);
 1301         CHN_LOCK(c);
 1302         c->flags |= CHN_F_DEAD;
 1303         chn_lockdestroy(c);
 1304 
 1305         return (0);
 1306 }
 1307 
 1308 /* XXX Obsolete. Use *_matrix() variant instead. */
 1309 int
 1310 chn_setvolume(struct pcm_channel *c, int left, int right)
 1311 {
 1312         int ret;
 1313 
 1314         ret = chn_setvolume_matrix(c, SND_VOL_C_MASTER, SND_CHN_T_FL, left);
 1315         ret |= chn_setvolume_matrix(c, SND_VOL_C_MASTER, SND_CHN_T_FR,
 1316             right) << 8;
 1317 
 1318         return (ret);
 1319 }
 1320 
 1321 int
 1322 chn_setvolume_multi(struct pcm_channel *c, int vc, int left, int right,
 1323     int center)
 1324 {
 1325         int i, ret;
 1326 
 1327         ret = 0;
 1328 
 1329         for (i = 0; i < SND_CHN_T_MAX; i++) {
 1330                 if ((1 << i) & SND_CHN_LEFT_MASK)
 1331                         ret |= chn_setvolume_matrix(c, vc, i, left);
 1332                 else if ((1 << i) & SND_CHN_RIGHT_MASK)
 1333                         ret |= chn_setvolume_matrix(c, vc, i, right) << 8;
 1334                 else
 1335                         ret |= chn_setvolume_matrix(c, vc, i, center) << 16;
 1336         }
 1337 
 1338         return (ret);
 1339 }
 1340 
 1341 int
 1342 chn_setvolume_matrix(struct pcm_channel *c, int vc, int vt, int val)
 1343 {
 1344         int i;
 1345 
 1346         KASSERT(c != NULL && vc >= SND_VOL_C_MASTER && vc < SND_VOL_C_MAX &&
 1347             (vc == SND_VOL_C_MASTER || (vc & 1)) &&
 1348             (vt == SND_CHN_T_VOL_0DB || (vt >= SND_CHN_T_BEGIN &&
 1349             vt <= SND_CHN_T_END)) && (vt != SND_CHN_T_VOL_0DB ||
 1350             (val >= SND_VOL_0DB_MIN && val <= SND_VOL_0DB_MAX)),
 1351             ("%s(): invalid volume matrix c=%p vc=%d vt=%d val=%d",
 1352             __func__, c, vc, vt, val));
 1353         CHN_LOCKASSERT(c);
 1354 
 1355         if (val < 0)
 1356                 val = 0;
 1357         if (val > 100)
 1358                 val = 100;
 1359 
 1360         c->volume[vc][vt] = val;
 1361 
 1362         /*
 1363          * Do relative calculation here and store it into class + 1
 1364          * to ease the job of feeder_volume.
 1365          */
 1366         if (vc == SND_VOL_C_MASTER) {
 1367                 for (vc = SND_VOL_C_BEGIN; vc <= SND_VOL_C_END;
 1368                     vc += SND_VOL_C_STEP)
 1369                         c->volume[SND_VOL_C_VAL(vc)][vt] =
 1370                             SND_VOL_CALC_VAL(c->volume, vc, vt);
 1371         } else if (vc & 1) {
 1372                 if (vt == SND_CHN_T_VOL_0DB)
 1373                         for (i = SND_CHN_T_BEGIN; i <= SND_CHN_T_END;
 1374                             i += SND_CHN_T_STEP) {
 1375                                 c->volume[SND_VOL_C_VAL(vc)][i] =
 1376                                     SND_VOL_CALC_VAL(c->volume, vc, i);
 1377                         }
 1378                 else
 1379                         c->volume[SND_VOL_C_VAL(vc)][vt] =
 1380                             SND_VOL_CALC_VAL(c->volume, vc, vt);
 1381         }
 1382 
 1383         return (val);
 1384 }
 1385 
 1386 int
 1387 chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt)
 1388 {
 1389         KASSERT(c != NULL && vc >= SND_VOL_C_MASTER && vc < SND_VOL_C_MAX &&
 1390             (vt == SND_CHN_T_VOL_0DB ||
 1391             (vt >= SND_CHN_T_BEGIN && vt <= SND_CHN_T_END)),
 1392             ("%s(): invalid volume matrix c=%p vc=%d vt=%d",
 1393             __func__, c, vc, vt));
 1394         CHN_LOCKASSERT(c);
 1395 
 1396         return (c->volume[vc][vt]);
 1397 }
 1398 
 1399 struct pcmchan_matrix *
 1400 chn_getmatrix(struct pcm_channel *c)
 1401 {
 1402 
 1403         KASSERT(c != NULL, ("%s(): NULL channel", __func__));
 1404         CHN_LOCKASSERT(c);
 1405 
 1406         if (!(c->format & AFMT_CONVERTIBLE))
 1407                 return (NULL);
 1408 
 1409         return (&c->matrix);
 1410 }
 1411 
 1412 int
 1413 chn_setmatrix(struct pcm_channel *c, struct pcmchan_matrix *m)
 1414 {
 1415 
 1416         KASSERT(c != NULL && m != NULL,
 1417             ("%s(): NULL channel or matrix", __func__));
 1418         CHN_LOCKASSERT(c);
 1419 
 1420         if (!(c->format & AFMT_CONVERTIBLE))
 1421                 return (EINVAL);
 1422 
 1423         c->matrix = *m;
 1424         c->matrix.id = SND_CHN_MATRIX_PCMCHANNEL;
 1425 
 1426         return (chn_setformat(c, SND_FORMAT(c->format, m->channels, m->ext)));
 1427 }
 1428 
 1429 /*
 1430  * XXX chn_oss_* exists for the sake of compatibility.
 1431  */
 1432 int
 1433 chn_oss_getorder(struct pcm_channel *c, unsigned long long *map)
 1434 {
 1435 
 1436         KASSERT(c != NULL && map != NULL,
 1437             ("%s(): NULL channel or map", __func__));
 1438         CHN_LOCKASSERT(c);
 1439 
 1440         if (!(c->format & AFMT_CONVERTIBLE))
 1441                 return (EINVAL);
 1442 
 1443         return (feeder_matrix_oss_get_channel_order(&c->matrix, map));
 1444 }
 1445 
 1446 int
 1447 chn_oss_setorder(struct pcm_channel *c, unsigned long long *map)
 1448 {
 1449         struct pcmchan_matrix m;
 1450         int ret;
 1451 
 1452         KASSERT(c != NULL && map != NULL,
 1453             ("%s(): NULL channel or map", __func__));
 1454         CHN_LOCKASSERT(c);
 1455 
 1456         if (!(c->format & AFMT_CONVERTIBLE))
 1457                 return (EINVAL);
 1458 
 1459         m = c->matrix;
 1460         ret = feeder_matrix_oss_set_channel_order(&m, map);
 1461         if (ret != 0)
 1462                 return (ret);
 1463 
 1464         return (chn_setmatrix(c, &m));
 1465 }
 1466 
 1467 #define SND_CHN_OSS_FRONT       (SND_CHN_T_MASK_FL | SND_CHN_T_MASK_FR)
 1468 #define SND_CHN_OSS_SURR        (SND_CHN_T_MASK_SL | SND_CHN_T_MASK_SR)
 1469 #define SND_CHN_OSS_CENTER_LFE  (SND_CHN_T_MASK_FC | SND_CHN_T_MASK_LF)
 1470 #define SND_CHN_OSS_REAR        (SND_CHN_T_MASK_BL | SND_CHN_T_MASK_BR)
 1471 
 1472 int
 1473 chn_oss_getmask(struct pcm_channel *c, uint32_t *retmask)
 1474 {
 1475         struct pcmchan_matrix *m;
 1476         struct pcmchan_caps *caps;
 1477         uint32_t i, format;
 1478 
 1479         KASSERT(c != NULL && retmask != NULL,
 1480             ("%s(): NULL channel or retmask", __func__));
 1481         CHN_LOCKASSERT(c);
 1482 
 1483         caps = chn_getcaps(c);
 1484         if (caps == NULL || caps->fmtlist == NULL)
 1485                 return (ENODEV);
 1486 
 1487         for (i = 0; caps->fmtlist[i] != 0; i++) {
 1488                 format = caps->fmtlist[i];
 1489                 if (!(format & AFMT_CONVERTIBLE)) {
 1490                         *retmask |= DSP_BIND_SPDIF;
 1491                         continue;
 1492                 }
 1493                 m = CHANNEL_GETMATRIX(c->methods, c->devinfo, format);
 1494                 if (m == NULL)
 1495                         continue;
 1496                 if (m->mask & SND_CHN_OSS_FRONT)
 1497                         *retmask |= DSP_BIND_FRONT;
 1498                 if (m->mask & SND_CHN_OSS_SURR)
 1499                         *retmask |= DSP_BIND_SURR;
 1500                 if (m->mask & SND_CHN_OSS_CENTER_LFE)
 1501                         *retmask |= DSP_BIND_CENTER_LFE;
 1502                 if (m->mask & SND_CHN_OSS_REAR)
 1503                         *retmask |= DSP_BIND_REAR;
 1504         }
 1505 
 1506         /* report software-supported binding mask */
 1507         if (!CHN_BITPERFECT(c) && report_soft_matrix)
 1508                 *retmask |= DSP_BIND_FRONT | DSP_BIND_SURR |
 1509                     DSP_BIND_CENTER_LFE | DSP_BIND_REAR;
 1510 
 1511         return (0);
 1512 }
 1513 
 1514 void
 1515 chn_vpc_reset(struct pcm_channel *c, int vc, int force)
 1516 {
 1517         int i;
 1518 
 1519         KASSERT(c != NULL && vc >= SND_VOL_C_BEGIN && vc <= SND_VOL_C_END,
 1520             ("%s(): invalid reset c=%p vc=%d", __func__, c, vc));
 1521         CHN_LOCKASSERT(c);
 1522 
 1523         if (force == 0 && chn_vpc_autoreset == 0)
 1524                 return;
 1525 
 1526         for (i = SND_CHN_T_BEGIN; i <= SND_CHN_T_END; i += SND_CHN_T_STEP)
 1527                 CHN_SETVOLUME(c, vc, i, c->volume[vc][SND_CHN_T_VOL_0DB]);
 1528 }
 1529 
 1530 static u_int32_t
 1531 round_pow2(u_int32_t v)
 1532 {
 1533         u_int32_t ret;
 1534 
 1535         if (v < 2)
 1536                 v = 2;
 1537         ret = 0;
 1538         while (v >> ret)
 1539                 ret++;
 1540         ret = 1 << (ret - 1);
 1541         while (ret < v)
 1542                 ret <<= 1;
 1543         return ret;
 1544 }
 1545 
 1546 static u_int32_t
 1547 round_blksz(u_int32_t v, int round)
 1548 {
 1549         u_int32_t ret, tmp;
 1550 
 1551         if (round < 1)
 1552                 round = 1;
 1553 
 1554         ret = min(round_pow2(v), CHN_2NDBUFMAXSIZE >> 1);
 1555 
 1556         if (ret > v && (ret >> 1) > 0 && (ret >> 1) >= ((v * 3) >> 2))
 1557                 ret >>= 1;
 1558 
 1559         tmp = ret - (ret % round);
 1560         while (tmp < 16 || tmp < round) {
 1561                 ret <<= 1;
 1562                 tmp = ret - (ret % round);
 1563         }
 1564 
 1565         return ret;
 1566 }
 1567 
 1568 /*
 1569  * 4Front call it DSP Policy, while we call it "Latency Profile". The idea
 1570  * is to keep 2nd buffer short so that it doesn't cause long queue during
 1571  * buffer transfer.
 1572  *
 1573  *    Latency reference table for 48khz stereo 16bit: (PLAY)
 1574  *
 1575  *      +---------+------------+-----------+------------+
 1576  *      | Latency | Blockcount | Blocksize | Buffersize |
 1577  *      +---------+------------+-----------+------------+
 1578  *      |     0   |       2    |   64      |    128     |
 1579  *      +---------+------------+-----------+------------+
 1580  *      |     1   |       4    |   128     |    512     |
 1581  *      +---------+------------+-----------+------------+
 1582  *      |     2   |       8    |   512     |    4096    |
 1583  *      +---------+------------+-----------+------------+
 1584  *      |     3   |      16    |   512     |    8192    |
 1585  *      +---------+------------+-----------+------------+
 1586  *      |     4   |      32    |   512     |    16384   |
 1587  *      +---------+------------+-----------+------------+
 1588  *      |     5   |      32    |   1024    |    32768   |
 1589  *      +---------+------------+-----------+------------+
 1590  *      |     6   |      16    |   2048    |    32768   |
 1591  *      +---------+------------+-----------+------------+
 1592  *      |     7   |       8    |   4096    |    32768   |
 1593  *      +---------+------------+-----------+------------+
 1594  *      |     8   |       4    |   8192    |    32768   |
 1595  *      +---------+------------+-----------+------------+
 1596  *      |     9   |       2    |   16384   |    32768   |
 1597  *      +---------+------------+-----------+------------+
 1598  *      |    10   |       2    |   32768   |    65536   |
 1599  *      +---------+------------+-----------+------------+
 1600  *
 1601  * Recording need a different reference table. All we care is
 1602  * gobbling up everything within reasonable buffering threshold.
 1603  *
 1604  *    Latency reference table for 48khz stereo 16bit: (REC)
 1605  *
 1606  *      +---------+------------+-----------+------------+
 1607  *      | Latency | Blockcount | Blocksize | Buffersize |
 1608  *      +---------+------------+-----------+------------+
 1609  *      |     0   |     512    |   32      |    16384   |
 1610  *      +---------+------------+-----------+------------+
 1611  *      |     1   |     256    |   64      |    16384   |
 1612  *      +---------+------------+-----------+------------+
 1613  *      |     2   |     128    |   128     |    16384   |
 1614  *      +---------+------------+-----------+------------+
 1615  *      |     3   |      64    |   256     |    16384   |
 1616  *      +---------+------------+-----------+------------+
 1617  *      |     4   |      32    |   512     |    16384   |
 1618  *      +---------+------------+-----------+------------+
 1619  *      |     5   |      32    |   1024    |    32768   |
 1620  *      +---------+------------+-----------+------------+
 1621  *      |     6   |      16    |   2048    |    32768   |
 1622  *      +---------+------------+-----------+------------+
 1623  *      |     7   |       8    |   4096    |    32768   |
 1624  *      +---------+------------+-----------+------------+
 1625  *      |     8   |       4    |   8192    |    32768   |
 1626  *      +---------+------------+-----------+------------+
 1627  *      |     9   |       2    |   16384   |    32768   |
 1628  *      +---------+------------+-----------+------------+
 1629  *      |    10   |       2    |   32768   |    65536   |
 1630  *      +---------+------------+-----------+------------+
 1631  *
 1632  * Calculations for other data rate are entirely based on these reference
 1633  * tables. For normal operation, Latency 5 seems give the best, well
 1634  * balanced performance for typical workload. Anything below 5 will
 1635  * eat up CPU to keep up with increasing context switches because of
 1636  * shorter buffer space and usually require the application to handle it
 1637  * aggresively through possibly real time programming technique.
 1638  *
 1639  */
 1640 #define CHN_LATENCY_PBLKCNT_REF                         \
 1641         {{1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 1},             \
 1642         {1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 1}}
 1643 #define CHN_LATENCY_PBUFSZ_REF                          \
 1644         {{7, 9, 12, 13, 14, 15, 15, 15, 15, 15, 16},    \
 1645         {11, 12, 13, 14, 15, 16, 16, 16, 16, 16, 17}}
 1646 
 1647 #define CHN_LATENCY_RBLKCNT_REF                         \
 1648         {{9, 8, 7, 6, 5, 5, 4, 3, 2, 1, 1},             \
 1649         {9, 8, 7, 6, 5, 5, 4, 3, 2, 1, 1}}
 1650 #define CHN_LATENCY_RBUFSZ_REF                          \
 1651         {{14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 16},  \
 1652         {15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17}}
 1653 
 1654 #define CHN_LATENCY_DATA_REF    192000 /* 48khz stereo 16bit ~ 48000 x 2 x 2 */
 1655 
 1656 static int
 1657 chn_calclatency(int dir, int latency, int bps, u_int32_t datarate,
 1658                                 u_int32_t max, int *rblksz, int *rblkcnt)
 1659 {
 1660         static int pblkcnts[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
 1661             CHN_LATENCY_PBLKCNT_REF;
 1662         static int  pbufszs[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
 1663             CHN_LATENCY_PBUFSZ_REF;
 1664         static int rblkcnts[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
 1665             CHN_LATENCY_RBLKCNT_REF;
 1666         static int  rbufszs[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
 1667             CHN_LATENCY_RBUFSZ_REF;
 1668         u_int32_t bufsz;
 1669         int lprofile, blksz, blkcnt;
 1670 
 1671         if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX ||
 1672             bps < 1 || datarate < 1 ||
 1673             !(dir == PCMDIR_PLAY || dir == PCMDIR_REC)) {
 1674                 if (rblksz != NULL)
 1675                         *rblksz = CHN_2NDBUFMAXSIZE >> 1;
 1676                 if (rblkcnt != NULL)
 1677                         *rblkcnt = 2;
 1678                 printf("%s(): FAILED dir=%d latency=%d bps=%d "
 1679                     "datarate=%u max=%u\n",
 1680                     __func__, dir, latency, bps, datarate, max);
 1681                 return CHN_2NDBUFMAXSIZE;
 1682         }
 1683 
 1684         lprofile = chn_latency_profile;
 1685 
 1686         if (dir == PCMDIR_PLAY) {
 1687                 blkcnt = pblkcnts[lprofile][latency];
 1688                 bufsz = pbufszs[lprofile][latency];
 1689         } else {
 1690                 blkcnt = rblkcnts[lprofile][latency];
 1691                 bufsz = rbufszs[lprofile][latency];
 1692         }
 1693 
 1694         bufsz = round_pow2(snd_xbytes(1 << bufsz, CHN_LATENCY_DATA_REF,
 1695             datarate));
 1696         if (bufsz > max)
 1697                 bufsz = max;
 1698         blksz = round_blksz(bufsz >> blkcnt, bps);
 1699 
 1700         if (rblksz != NULL)
 1701                 *rblksz = blksz;
 1702         if (rblkcnt != NULL)
 1703                 *rblkcnt = 1 << blkcnt;
 1704 
 1705         return blksz << blkcnt;
 1706 }
 1707 
 1708 static int
 1709 chn_resizebuf(struct pcm_channel *c, int latency,
 1710                                         int blkcnt, int blksz)
 1711 {
 1712         struct snd_dbuf *b, *bs, *pb;
 1713         int sblksz, sblkcnt, hblksz, hblkcnt, limit = 0, nsblksz, nsblkcnt;
 1714         int ret;
 1715 
 1716         CHN_LOCKASSERT(c);
 1717 
 1718         if ((c->flags & (CHN_F_MMAP | CHN_F_TRIGGERED)) ||
 1719             !(c->direction == PCMDIR_PLAY || c->direction == PCMDIR_REC))
 1720                 return EINVAL;
 1721 
 1722         if (latency == -1) {
 1723                 c->latency = -1;
 1724                 latency = chn_latency;
 1725         } else if (latency == -2) {
 1726                 latency = c->latency;
 1727                 if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX)
 1728                         latency = chn_latency;
 1729         } else if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX)
 1730                 return EINVAL;
 1731         else {
 1732                 c->latency = latency;
 1733         }
 1734 
 1735         bs = c->bufsoft;
 1736         b = c->bufhard;
 1737 
 1738         if (!(blksz == 0 || blkcnt == -1) &&
 1739             (blksz < 16 || blksz < sndbuf_getalign(bs) || blkcnt < 2 ||
 1740             (blksz * blkcnt) > CHN_2NDBUFMAXSIZE))
 1741                 return EINVAL;
 1742 
 1743         chn_calclatency(c->direction, latency, sndbuf_getalign(bs),
 1744             sndbuf_getalign(bs) * sndbuf_getspd(bs), CHN_2NDBUFMAXSIZE,
 1745             &sblksz, &sblkcnt);
 1746 
 1747         if (blksz == 0 || blkcnt == -1) {
 1748                 if (blkcnt == -1)
 1749                         c->flags &= ~CHN_F_HAS_SIZE;
 1750                 if (c->flags & CHN_F_HAS_SIZE) {
 1751                         blksz = sndbuf_getblksz(bs);
 1752                         blkcnt = sndbuf_getblkcnt(bs);
 1753                 }
 1754         } else
 1755                 c->flags |= CHN_F_HAS_SIZE;
 1756 
 1757         if (c->flags & CHN_F_HAS_SIZE) {
 1758                 /*
 1759                  * The application has requested their own blksz/blkcnt.
 1760                  * Just obey with it, and let them toast alone. We can
 1761                  * clamp it to the nearest latency profile, but that would
 1762                  * defeat the purpose of having custom control. The least
 1763                  * we can do is round it to the nearest ^2 and align it.
 1764                  */
 1765                 sblksz = round_blksz(blksz, sndbuf_getalign(bs));
 1766                 sblkcnt = round_pow2(blkcnt);
 1767         }
 1768 
 1769         if (c->parentchannel != NULL) {
 1770                 pb = c->parentchannel->bufsoft;
 1771                 CHN_UNLOCK(c);
 1772                 CHN_LOCK(c->parentchannel);
 1773                 chn_notify(c->parentchannel, CHN_N_BLOCKSIZE);
 1774                 CHN_UNLOCK(c->parentchannel);
 1775                 CHN_LOCK(c);
 1776                 if (c->direction == PCMDIR_PLAY) {
 1777                         limit = (pb != NULL) ?
 1778                             sndbuf_xbytes(sndbuf_getsize(pb), pb, bs) : 0;
 1779                 } else {
 1780                         limit = (pb != NULL) ?
 1781                             sndbuf_xbytes(sndbuf_getblksz(pb), pb, bs) * 2 : 0;
 1782                 }
 1783         } else {
 1784                 hblkcnt = 2;
 1785                 if (c->flags & CHN_F_HAS_SIZE) {
 1786                         hblksz = round_blksz(sndbuf_xbytes(sblksz, bs, b),
 1787                             sndbuf_getalign(b));
 1788                         hblkcnt = round_pow2(sndbuf_getblkcnt(bs));
 1789                 } else
 1790                         chn_calclatency(c->direction, latency,
 1791                             sndbuf_getalign(b),
 1792                             sndbuf_getalign(b) * sndbuf_getspd(b),
 1793                             CHN_2NDBUFMAXSIZE, &hblksz, &hblkcnt);
 1794 
 1795                 if ((hblksz << 1) > sndbuf_getmaxsize(b))
 1796                         hblksz = round_blksz(sndbuf_getmaxsize(b) >> 1,
 1797                             sndbuf_getalign(b));
 1798 
 1799                 while ((hblksz * hblkcnt) > sndbuf_getmaxsize(b)) {
 1800                         if (hblkcnt < 4)
 1801                                 hblksz >>= 1;
 1802                         else
 1803                                 hblkcnt >>= 1;
 1804                 }
 1805 
 1806                 hblksz -= hblksz % sndbuf_getalign(b);
 1807 
 1808 #if 0
 1809                 hblksz = sndbuf_getmaxsize(b) >> 1;
 1810                 hblksz -= hblksz % sndbuf_getalign(b);
 1811                 hblkcnt = 2;
 1812 #endif
 1813 
 1814                 CHN_UNLOCK(c);
 1815                 if (chn_usefrags == 0 ||
 1816                     CHANNEL_SETFRAGMENTS(c->methods, c->devinfo,
 1817                     hblksz, hblkcnt) != 0)
 1818                         sndbuf_setblksz(b, CHANNEL_SETBLOCKSIZE(c->methods,
 1819                             c->devinfo, hblksz));
 1820                 CHN_LOCK(c);
 1821 
 1822                 if (!CHN_EMPTY(c, children)) {
 1823                         nsblksz = round_blksz(
 1824                             sndbuf_xbytes(sndbuf_getblksz(b), b, bs),
 1825                             sndbuf_getalign(bs));
 1826                         nsblkcnt = sndbuf_getblkcnt(b);
 1827                         if (c->direction == PCMDIR_PLAY) {
 1828                                 do {
 1829                                         nsblkcnt--;
 1830                                 } while (nsblkcnt >= 2 &&
 1831                                     nsblksz * nsblkcnt >= sblksz * sblkcnt);
 1832                                 nsblkcnt++;
 1833                         }
 1834                         sblksz = nsblksz;
 1835                         sblkcnt = nsblkcnt;
 1836                         limit = 0;
 1837                 } else
 1838                         limit = sndbuf_xbytes(sndbuf_getblksz(b), b, bs) * 2;
 1839         }
 1840 
 1841         if (limit > CHN_2NDBUFMAXSIZE)
 1842                 limit = CHN_2NDBUFMAXSIZE;
 1843 
 1844 #if 0
 1845         while (limit > 0 && (sblksz * sblkcnt) > limit) {
 1846                 if (sblkcnt < 4)
 1847                         break;
 1848                 sblkcnt >>= 1;
 1849         }
 1850 #endif
 1851 
 1852         while ((sblksz * sblkcnt) < limit)
 1853                 sblkcnt <<= 1;
 1854 
 1855         while ((sblksz * sblkcnt) > CHN_2NDBUFMAXSIZE) {
 1856                 if (sblkcnt < 4)
 1857                         sblksz >>= 1;
 1858                 else
 1859                         sblkcnt >>= 1;
 1860         }
 1861 
 1862         sblksz -= sblksz % sndbuf_getalign(bs);
 1863 
 1864         if (sndbuf_getblkcnt(bs) != sblkcnt || sndbuf_getblksz(bs) != sblksz ||
 1865             sndbuf_getsize(bs) != (sblkcnt * sblksz)) {
 1866                 ret = sndbuf_remalloc(bs, sblkcnt, sblksz);
 1867                 if (ret != 0) {
 1868                         device_printf(c->dev, "%s(): Failed: %d %d\n",
 1869                             __func__, sblkcnt, sblksz);
 1870                         return ret;
 1871                 }
 1872         }
 1873 
 1874         /*
 1875          * Interrupt timeout
 1876          */
 1877         c->timeout = ((u_int64_t)hz * sndbuf_getsize(bs)) /
 1878             ((u_int64_t)sndbuf_getspd(bs) * sndbuf_getalign(bs));
 1879         if (c->parentchannel != NULL)
 1880                 c->timeout = min(c->timeout, c->parentchannel->timeout);
 1881         if (c->timeout < 1)
 1882                 c->timeout = 1;
 1883 
 1884         /*
 1885          * OSSv4 docs: "By default OSS will set the low water level equal
 1886          * to the fragment size which is optimal in most cases."
 1887          */
 1888         c->lw = sndbuf_getblksz(bs);
 1889         chn_resetbuf(c);
 1890 
 1891         if (snd_verbose > 3)
 1892                 device_printf(c->dev, "%s(): %s (%s) timeout=%u "
 1893                     "b[%d/%d/%d] bs[%d/%d/%d] limit=%d\n",
 1894                     __func__, CHN_DIRSTR(c),
 1895                     (c->flags & CHN_F_VIRTUAL) ? "virtual" : "hardware",
 1896                     c->timeout,
 1897                     sndbuf_getsize(b), sndbuf_getblksz(b),
 1898                     sndbuf_getblkcnt(b),
 1899                     sndbuf_getsize(bs), sndbuf_getblksz(bs),
 1900                     sndbuf_getblkcnt(bs), limit);
 1901 
 1902         return 0;
 1903 }
 1904 
 1905 int
 1906 chn_setlatency(struct pcm_channel *c, int latency)
 1907 {
 1908         CHN_LOCKASSERT(c);
 1909         /* Destroy blksz/blkcnt, enforce latency profile. */
 1910         return chn_resizebuf(c, latency, -1, 0);
 1911 }
 1912 
 1913 int
 1914 chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz)
 1915 {
 1916         CHN_LOCKASSERT(c);
 1917         /* Destroy latency profile, enforce blksz/blkcnt */
 1918         return chn_resizebuf(c, -1, blkcnt, blksz);
 1919 }
 1920 
 1921 int
 1922 chn_setparam(struct pcm_channel *c, uint32_t format, uint32_t speed)
 1923 {
 1924         struct pcmchan_caps *caps;
 1925         uint32_t hwspeed, delta;
 1926         int ret;
 1927 
 1928         CHN_LOCKASSERT(c);
 1929 
 1930         if (speed < 1 || format == 0 || CHN_STARTED(c))
 1931                 return (EINVAL);
 1932 
 1933         c->format = format;
 1934         c->speed = speed;
 1935 
 1936         caps = chn_getcaps(c);
 1937 
 1938         hwspeed = speed;
 1939         RANGE(hwspeed, caps->minspeed, caps->maxspeed);
 1940 
 1941         sndbuf_setspd(c->bufhard, CHANNEL_SETSPEED(c->methods, c->devinfo,
 1942             hwspeed));
 1943         hwspeed = sndbuf_getspd(c->bufhard);
 1944 
 1945         delta = (hwspeed > speed) ? (hwspeed - speed) : (speed - hwspeed);
 1946 
 1947         if (delta <= feeder_rate_round)
 1948                 c->speed = hwspeed;
 1949 
 1950         ret = feeder_chain(c);
 1951 
 1952         if (ret == 0)
 1953                 ret = CHANNEL_SETFORMAT(c->methods, c->devinfo,
 1954                     sndbuf_getfmt(c->bufhard));
 1955 
 1956         if (ret == 0)
 1957                 ret = chn_resizebuf(c, -2, 0, 0);
 1958 
 1959         return (ret);
 1960 }
 1961 
 1962 int
 1963 chn_setspeed(struct pcm_channel *c, uint32_t speed)
 1964 {
 1965         uint32_t oldformat, oldspeed, format;
 1966         int ret;
 1967 
 1968 #if 0
 1969         /* XXX force 48k */
 1970         if (c->format & AFMT_PASSTHROUGH)
 1971                 speed = AFMT_PASSTHROUGH_RATE;
 1972 #endif
 1973 
 1974         oldformat = c->format;
 1975         oldspeed = c->speed;
 1976         format = oldformat;
 1977 
 1978         ret = chn_setparam(c, format, speed);
 1979         if (ret != 0) {
 1980                 if (snd_verbose > 3)
 1981                         device_printf(c->dev,
 1982                             "%s(): Setting speed %d failed, "
 1983                             "falling back to %d\n",
 1984                             __func__, speed, oldspeed);
 1985                 chn_setparam(c, c->format, oldspeed);
 1986         }
 1987 
 1988         return (ret);
 1989 }
 1990 
 1991 int
 1992 chn_setformat(struct pcm_channel *c, uint32_t format)
 1993 {
 1994         uint32_t oldformat, oldspeed, speed;
 1995         int ret;
 1996 
 1997         /* XXX force stereo */
 1998         if ((format & AFMT_PASSTHROUGH) && AFMT_CHANNEL(format) < 2) {
 1999                 format = SND_FORMAT(format, AFMT_PASSTHROUGH_CHANNEL,
 2000                     AFMT_PASSTHROUGH_EXTCHANNEL);
 2001         }
 2002 
 2003         oldformat = c->format;
 2004         oldspeed = c->speed;
 2005         speed = oldspeed;
 2006 
 2007         ret = chn_setparam(c, format, speed);
 2008         if (ret != 0) {
 2009                 if (snd_verbose > 3)
 2010                         device_printf(c->dev,
 2011                             "%s(): Format change 0x%08x failed, "
 2012                             "falling back to 0x%08x\n",
 2013                             __func__, format, oldformat);
 2014                 chn_setparam(c, oldformat, oldspeed);
 2015         }
 2016 
 2017         return (ret);
 2018 }
 2019 
 2020 void
 2021 chn_syncstate(struct pcm_channel *c)
 2022 {
 2023         struct snddev_info *d;
 2024         struct snd_mixer *m;
 2025 
 2026         d = (c != NULL) ? c->parentsnddev : NULL;
 2027         m = (d != NULL && d->mixer_dev != NULL) ? d->mixer_dev->si_drv1 :
 2028             NULL;
 2029 
 2030         if (d == NULL || m == NULL)
 2031                 return;
 2032 
 2033         CHN_LOCKASSERT(c);
 2034 
 2035         if (c->feederflags & (1 << FEEDER_VOLUME)) {
 2036                 uint32_t parent;
 2037                 int vol, pvol, left, right, center;
 2038 
 2039                 if (c->direction == PCMDIR_PLAY &&
 2040                     (d->flags & SD_F_SOFTPCMVOL)) {
 2041                         /* CHN_UNLOCK(c); */
 2042                         vol = mix_get(m, SOUND_MIXER_PCM);
 2043                         parent = mix_getparent(m, SOUND_MIXER_PCM);
 2044                         if (parent != SOUND_MIXER_NONE)
 2045                                 pvol = mix_get(m, parent);
 2046                         else
 2047                                 pvol = 100 | (100 << 8);
 2048                         /* CHN_LOCK(c); */
 2049                 } else {
 2050                         vol = 100 | (100 << 8);
 2051                         pvol = vol;
 2052                 }
 2053 
 2054                 if (vol == -1) {
 2055                         device_printf(c->dev,
 2056                             "Soft PCM Volume: Failed to read pcm "
 2057                             "default value\n");
 2058                         vol = 100 | (100 << 8);
 2059                 }
 2060 
 2061                 if (pvol == -1) {
 2062                         device_printf(c->dev,
 2063                             "Soft PCM Volume: Failed to read parent "
 2064                             "default value\n");
 2065                         pvol = 100 | (100 << 8);
 2066                 }
 2067 
 2068                 left = ((vol & 0x7f) * (pvol & 0x7f)) / 100;
 2069                 right = (((vol >> 8) & 0x7f) * ((pvol >> 8) & 0x7f)) / 100;
 2070                 center = (left + right) >> 1;
 2071 
 2072                 chn_setvolume_multi(c, SND_VOL_C_MASTER, left, right, center);
 2073         }
 2074 
 2075         if (c->feederflags & (1 << FEEDER_EQ)) {
 2076                 struct pcm_feeder *f;
 2077                 int treble, bass, state;
 2078 
 2079                 /* CHN_UNLOCK(c); */
 2080                 treble = mix_get(m, SOUND_MIXER_TREBLE);
 2081                 bass = mix_get(m, SOUND_MIXER_BASS);
 2082                 /* CHN_LOCK(c); */
 2083 
 2084                 if (treble == -1)
 2085                         treble = 50;
 2086                 else
 2087                         treble = ((treble & 0x7f) +
 2088                             ((treble >> 8) & 0x7f)) >> 1;
 2089 
 2090                 if (bass == -1)
 2091                         bass = 50;
 2092                 else
 2093                         bass = ((bass & 0x7f) + ((bass >> 8) & 0x7f)) >> 1;
 2094 
 2095                 f = chn_findfeeder(c, FEEDER_EQ);
 2096                 if (f != NULL) {
 2097                         if (FEEDER_SET(f, FEEDEQ_TREBLE, treble) != 0)
 2098                                 device_printf(c->dev,
 2099                                     "EQ: Failed to set treble -- %d\n",
 2100                                     treble);
 2101                         if (FEEDER_SET(f, FEEDEQ_BASS, bass) != 0)
 2102                                 device_printf(c->dev,
 2103                                     "EQ: Failed to set bass -- %d\n",
 2104                                     bass);
 2105                         if (FEEDER_SET(f, FEEDEQ_PREAMP, d->eqpreamp) != 0)
 2106                                 device_printf(c->dev,
 2107                                     "EQ: Failed to set preamp -- %d\n",
 2108                                     d->eqpreamp);
 2109                         if (d->flags & SD_F_EQ_BYPASSED)
 2110                                 state = FEEDEQ_BYPASS;
 2111                         else if (d->flags & SD_F_EQ_ENABLED)
 2112                                 state = FEEDEQ_ENABLE;
 2113                         else
 2114                                 state = FEEDEQ_DISABLE;
 2115                         if (FEEDER_SET(f, FEEDEQ_STATE, state) != 0)
 2116                                 device_printf(c->dev,
 2117                                     "EQ: Failed to set state -- %d\n", state);
 2118                 }
 2119         }
 2120 }
 2121 
 2122 int
 2123 chn_trigger(struct pcm_channel *c, int go)
 2124 {
 2125 #ifdef DEV_ISA
 2126         struct snd_dbuf *b = c->bufhard;
 2127 #endif
 2128         struct snddev_info *d = c->parentsnddev;
 2129         int ret;
 2130 
 2131         CHN_LOCKASSERT(c);
 2132 #ifdef DEV_ISA
 2133         if (SND_DMA(b) && (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD))
 2134                 sndbuf_dmabounce(b);
 2135 #endif
 2136         if (!PCMTRIG_COMMON(go))
 2137                 return (CHANNEL_TRIGGER(c->methods, c->devinfo, go));
 2138 
 2139         if (go == c->trigger)
 2140                 return (0);
 2141 
 2142         ret = CHANNEL_TRIGGER(c->methods, c->devinfo, go);
 2143         if (ret != 0)
 2144                 return (ret);
 2145 
 2146         switch (go) {
 2147         case PCMTRIG_START:
 2148                 if (snd_verbose > 3)
 2149                         device_printf(c->dev,
 2150                             "%s() %s: calling go=0x%08x , "
 2151                             "prev=0x%08x\n", __func__, c->name, go,
 2152                             c->trigger);
 2153                 if (c->trigger != PCMTRIG_START) {
 2154                         c->trigger = go;
 2155                         CHN_UNLOCK(c);
 2156                         PCM_LOCK(d);
 2157                         CHN_INSERT_HEAD(d, c, channels.pcm.busy);
 2158                         PCM_UNLOCK(d);
 2159                         CHN_LOCK(c);
 2160                         chn_syncstate(c);
 2161                 }
 2162                 break;
 2163         case PCMTRIG_STOP:
 2164         case PCMTRIG_ABORT:
 2165                 if (snd_verbose > 3)
 2166                         device_printf(c->dev,
 2167                             "%s() %s: calling go=0x%08x , "
 2168                             "prev=0x%08x\n", __func__, c->name, go,
 2169                             c->trigger);
 2170                 if (c->trigger == PCMTRIG_START) {
 2171                         c->trigger = go;
 2172                         CHN_UNLOCK(c);
 2173                         PCM_LOCK(d);
 2174                         CHN_REMOVE(d, c, channels.pcm.busy);
 2175                         PCM_UNLOCK(d);
 2176                         CHN_LOCK(c);
 2177                 }
 2178                 break;
 2179         default:
 2180                 break;
 2181         }
 2182 
 2183         return (0);
 2184 }
 2185 
 2186 /**
 2187  * @brief Queries sound driver for sample-aligned hardware buffer pointer index
 2188  *
 2189  * This function obtains the hardware pointer location, then aligns it to
 2190  * the current bytes-per-sample value before returning.  (E.g., a channel
 2191  * running in 16 bit stereo mode would require 4 bytes per sample, so a
 2192  * hwptr value ranging from 32-35 would be returned as 32.)
 2193  *
 2194  * @param c     PCM channel context     
 2195  * @returns     sample-aligned hardware buffer pointer index
 2196  */
 2197 int
 2198 chn_getptr(struct pcm_channel *c)
 2199 {
 2200         int hwptr;
 2201 
 2202         CHN_LOCKASSERT(c);
 2203         hwptr = (CHN_STARTED(c)) ? CHANNEL_GETPTR(c->methods, c->devinfo) : 0;
 2204         return (hwptr - (hwptr % sndbuf_getalign(c->bufhard)));
 2205 }
 2206 
 2207 struct pcmchan_caps *
 2208 chn_getcaps(struct pcm_channel *c)
 2209 {
 2210         CHN_LOCKASSERT(c);
 2211         return CHANNEL_GETCAPS(c->methods, c->devinfo);
 2212 }
 2213 
 2214 u_int32_t
 2215 chn_getformats(struct pcm_channel *c)
 2216 {
 2217         u_int32_t *fmtlist, fmts;
 2218         int i;
 2219 
 2220         fmtlist = chn_getcaps(c)->fmtlist;
 2221         fmts = 0;
 2222         for (i = 0; fmtlist[i]; i++)
 2223                 fmts |= fmtlist[i];
 2224 
 2225         /* report software-supported formats */
 2226         if (!CHN_BITPERFECT(c) && report_soft_formats)
 2227                 fmts |= AFMT_CONVERTIBLE;
 2228 
 2229         return (AFMT_ENCODING(fmts));
 2230 }
 2231 
 2232 int
 2233 chn_notify(struct pcm_channel *c, u_int32_t flags)
 2234 {
 2235         struct pcm_channel *ch;
 2236         struct pcmchan_caps *caps;
 2237         uint32_t bestformat, bestspeed, besthwformat, *vchanformat, *vchanrate;
 2238         uint32_t vpflags;
 2239         int dirty, err, run, nrun;
 2240 
 2241         CHN_LOCKASSERT(c);
 2242 
 2243         if (CHN_EMPTY(c, children))
 2244                 return (ENODEV);
 2245 
 2246         err = 0;
 2247 
 2248         /*
 2249          * If the hwchan is running, we can't change its rate, format or
 2250          * blocksize
 2251          */
 2252         run = (CHN_STARTED(c)) ? 1 : 0;
 2253         if (run)
 2254                 flags &= CHN_N_VOLUME | CHN_N_TRIGGER;
 2255 
 2256         if (flags & CHN_N_RATE) {
 2257                 /*
 2258                  * XXX I'll make good use of this someday.
 2259                  *     However this is currently being superseded by
 2260                  *     the availability of CHN_F_VCHAN_DYNAMIC.
 2261                  */
 2262         }
 2263 
 2264         if (flags & CHN_N_FORMAT) {
 2265                 /*
 2266                  * XXX I'll make good use of this someday.
 2267                  *     However this is currently being superseded by
 2268                  *     the availability of CHN_F_VCHAN_DYNAMIC.
 2269                  */
 2270         }
 2271 
 2272         if (flags & CHN_N_VOLUME) {
 2273                 /*
 2274                  * XXX I'll make good use of this someday, though
 2275                  *     soft volume control is currently pretty much
 2276                  *     integrated.
 2277                  */
 2278         }
 2279 
 2280         if (flags & CHN_N_BLOCKSIZE) {
 2281                 /*
 2282                  * Set to default latency profile
 2283                  */
 2284                 chn_setlatency(c, chn_latency);
 2285         }
 2286 
 2287         if ((flags & CHN_N_TRIGGER) && !(c->flags & CHN_F_VCHAN_DYNAMIC)) {
 2288                 nrun = CHN_EMPTY(c, children.busy) ? 0 : 1;
 2289                 if (nrun && !run)
 2290                         err = chn_start(c, 1);
 2291                 if (!nrun && run)
 2292                         chn_abort(c);
 2293                 flags &= ~CHN_N_TRIGGER;
 2294         }
 2295 
 2296         if (flags & CHN_N_TRIGGER) {
 2297                 if (c->direction == PCMDIR_PLAY) {
 2298                         vchanformat = &c->parentsnddev->pvchanformat;
 2299                         vchanrate = &c->parentsnddev->pvchanrate;
 2300                 } else {
 2301                         vchanformat = &c->parentsnddev->rvchanformat;
 2302                         vchanrate = &c->parentsnddev->rvchanrate;
 2303                 }
 2304 
 2305                 /* Dynamic Virtual Channel */
 2306                 if (!(c->flags & CHN_F_VCHAN_ADAPTIVE)) {
 2307                         bestformat = *vchanformat;
 2308                         bestspeed = *vchanrate;
 2309                 } else {
 2310                         bestformat = 0;
 2311                         bestspeed = 0;
 2312                 }
 2313 
 2314                 besthwformat = 0;
 2315                 nrun = 0;
 2316                 caps = chn_getcaps(c);
 2317                 dirty = 0;
 2318                 vpflags = 0;
 2319 
 2320                 CHN_FOREACH(ch, c, children.busy) {
 2321                         CHN_LOCK(ch);
 2322                         if ((ch->format & AFMT_PASSTHROUGH) &&
 2323                             snd_fmtvalid(ch->format, caps->fmtlist)) {
 2324                                 bestformat = ch->format;
 2325                                 bestspeed = ch->speed;
 2326                                 CHN_UNLOCK(ch);
 2327                                 vpflags = CHN_F_PASSTHROUGH;
 2328                                 nrun++;
 2329                                 break;
 2330                         }
 2331                         if ((ch->flags & CHN_F_EXCLUSIVE) && vpflags == 0) {
 2332                                 if (c->flags & CHN_F_VCHAN_ADAPTIVE) {
 2333                                         bestspeed = ch->speed;
 2334                                         RANGE(bestspeed, caps->minspeed,
 2335                                             caps->maxspeed);
 2336                                         besthwformat = snd_fmtbest(ch->format,
 2337                                             caps->fmtlist);
 2338                                         if (besthwformat != 0)
 2339                                                 bestformat = besthwformat;
 2340                                 }
 2341                                 CHN_UNLOCK(ch);
 2342                                 vpflags = CHN_F_EXCLUSIVE;
 2343                                 nrun++;
 2344                                 continue;
 2345                         }
 2346                         if (!(c->flags & CHN_F_VCHAN_ADAPTIVE) ||
 2347                             vpflags != 0) {
 2348                                 CHN_UNLOCK(ch);
 2349                                 nrun++;
 2350                                 continue;
 2351                         }
 2352                         if (ch->speed > bestspeed) {
 2353                                 bestspeed = ch->speed;
 2354                                 RANGE(bestspeed, caps->minspeed,
 2355                                     caps->maxspeed);
 2356                         }
 2357                         besthwformat = snd_fmtbest(ch->format, caps->fmtlist);
 2358                         if (!(besthwformat & AFMT_VCHAN)) {
 2359                                 CHN_UNLOCK(ch);
 2360                                 nrun++;
 2361                                 continue;
 2362                         }
 2363                         if (AFMT_CHANNEL(besthwformat) >
 2364                             AFMT_CHANNEL(bestformat))
 2365                                 bestformat = besthwformat;
 2366                         else if (AFMT_CHANNEL(besthwformat) ==
 2367                             AFMT_CHANNEL(bestformat) &&
 2368                             AFMT_BIT(besthwformat) > AFMT_BIT(bestformat))
 2369                                 bestformat = besthwformat;
 2370                         CHN_UNLOCK(ch);
 2371                         nrun++;
 2372                 }
 2373 
 2374                 if (bestformat == 0)
 2375                         bestformat = c->format;
 2376                 if (bestspeed == 0)
 2377                         bestspeed = c->speed;
 2378 
 2379                 if (bestformat != c->format || bestspeed != c->speed)
 2380                         dirty = 1;
 2381 
 2382                 c->flags &= ~(CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE);
 2383                 c->flags |= vpflags;
 2384 
 2385                 if (nrun && !run) {
 2386                         if (dirty) {
 2387                                 bestspeed = CHANNEL_SETSPEED(c->methods,
 2388                                     c->devinfo, bestspeed);
 2389                                 err = chn_reset(c, bestformat, bestspeed);
 2390                         }
 2391                         if (err == 0 && dirty) {
 2392                                 CHN_FOREACH(ch, c, children.busy) {
 2393                                         CHN_LOCK(ch);
 2394                                         if (VCHAN_SYNC_REQUIRED(ch))
 2395                                                 vchan_sync(ch);
 2396                                         CHN_UNLOCK(ch);
 2397                                 }
 2398                         }
 2399                         if (err == 0) {
 2400                                 if (dirty)
 2401                                         c->flags |= CHN_F_DIRTY;
 2402                                 err = chn_start(c, 1);
 2403                         }
 2404                 }
 2405 
 2406                 if (nrun && run && dirty) {
 2407                         chn_abort(c);
 2408                         bestspeed = CHANNEL_SETSPEED(c->methods, c->devinfo,
 2409                             bestspeed);
 2410                         err = chn_reset(c, bestformat, bestspeed);
 2411                         if (err == 0) {
 2412                                 CHN_FOREACH(ch, c, children.busy) {
 2413                                         CHN_LOCK(ch);
 2414                                         if (VCHAN_SYNC_REQUIRED(ch))
 2415                                                 vchan_sync(ch);
 2416                                         CHN_UNLOCK(ch);
 2417                                 }
 2418                         }
 2419                         if (err == 0) {
 2420                                 c->flags |= CHN_F_DIRTY;
 2421                                 err = chn_start(c, 1);
 2422                         }
 2423                 }
 2424 
 2425                 if (err == 0 && !(bestformat & AFMT_PASSTHROUGH) &&
 2426                     (bestformat & AFMT_VCHAN)) {
 2427                         *vchanformat = bestformat;
 2428                         *vchanrate = bestspeed;
 2429                 }
 2430 
 2431                 if (!nrun && run) {
 2432                         c->flags &= ~(CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE);
 2433                         bestformat = *vchanformat;
 2434                         bestspeed = *vchanrate;
 2435                         chn_abort(c);
 2436                         if (c->format != bestformat || c->speed != bestspeed)
 2437                                 chn_reset(c, bestformat, bestspeed);
 2438                 }
 2439         }
 2440 
 2441         return (err);
 2442 }
 2443 
 2444 /**
 2445  * @brief Fetch array of supported discrete sample rates
 2446  *
 2447  * Wrapper for CHANNEL_GETRATES.  Please see channel_if.m:getrates() for
 2448  * detailed information.
 2449  *
 2450  * @note If the operation isn't supported, this function will just return 0
 2451  *       (no rates in the array), and *rates will be set to NULL.  Callers
 2452  *       should examine rates @b only if this function returns non-zero.
 2453  *
 2454  * @param c     pcm channel to examine
 2455  * @param rates pointer to array of integers; rate table will be recorded here
 2456  *
 2457  * @return number of rates in the array pointed to be @c rates
 2458  */
 2459 int
 2460 chn_getrates(struct pcm_channel *c, int **rates)
 2461 {
 2462         KASSERT(rates != NULL, ("rates is null"));
 2463         CHN_LOCKASSERT(c);
 2464         return CHANNEL_GETRATES(c->methods, c->devinfo, rates);
 2465 }
 2466 
 2467 /**
 2468  * @brief Remove channel from a sync group, if there is one.
 2469  *
 2470  * This function is initially intended for the following conditions:
 2471  *   - Starting a syncgroup (@c SNDCTL_DSP_SYNCSTART ioctl)
 2472  *   - Closing a device.  (A channel can't be destroyed if it's still in use.)
 2473  *
 2474  * @note Before calling this function, the syncgroup list mutex must be
 2475  * held.  (Consider pcm_channel::sm protected by the SG list mutex
 2476  * whether @c c is locked or not.)
 2477  *
 2478  * @param c     channel device to be started or closed
 2479  * @returns     If this channel was the only member of a group, the group ID
 2480  *              is returned to the caller so that the caller can release it
 2481  *              via free_unr() after giving up the syncgroup lock.  Else it
 2482  *              returns 0.
 2483  */
 2484 int
 2485 chn_syncdestroy(struct pcm_channel *c)
 2486 {
 2487         struct pcmchan_syncmember *sm;
 2488         struct pcmchan_syncgroup *sg;
 2489         int sg_id;
 2490 
 2491         sg_id = 0;
 2492 
 2493         PCM_SG_LOCKASSERT(MA_OWNED);
 2494 
 2495         if (c->sm != NULL) {
 2496                 sm = c->sm;
 2497                 sg = sm->parent;
 2498                 c->sm = NULL;
 2499 
 2500                 KASSERT(sg != NULL, ("syncmember has null parent"));
 2501 
 2502                 SLIST_REMOVE(&sg->members, sm, pcmchan_syncmember, link);
 2503                 free(sm, M_DEVBUF);
 2504 
 2505                 if (SLIST_EMPTY(&sg->members)) {
 2506                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2507                         sg_id = sg->id;
 2508                         free(sg, M_DEVBUF);
 2509                 }
 2510         }
 2511 
 2512         return sg_id;
 2513 }
 2514 
 2515 #ifdef OSSV4_EXPERIMENT
 2516 int
 2517 chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak)
 2518 {
 2519         CHN_LOCKASSERT(c);
 2520         return CHANNEL_GETPEAKS(c->methods, c->devinfo, lpeak, rpeak);
 2521 }
 2522 #endif

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