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/vchan.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006-2009 Ariff Abdullah <ariff@FreeBSD.org>
    5  * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
    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 /* Almost entirely rewritten to add multi-format/channels mixing support. */
   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 SND_DECLARE_FILE("$FreeBSD: stable/12/sys/dev/sound/pcm/vchan.c 326255 2017-11-27 14:52:40Z pfg $");
   40 
   41 /*
   42  * [ac3 , dts , linear , 0, linear, 0]
   43  */
   44 #define FMTLIST_MAX             6
   45 #define FMTLIST_OFFSET          4
   46 #define DIGFMTS_MAX             2
   47 
   48 #ifdef SND_DEBUG
   49 static int snd_passthrough_verbose = 0;
   50 SYSCTL_INT(_hw_snd, OID_AUTO, passthrough_verbose, CTLFLAG_RWTUN,
   51         &snd_passthrough_verbose, 0, "passthrough verbosity");
   52 
   53 #endif
   54 
   55 struct vchan_info {
   56         struct pcm_channel *channel;
   57         struct pcmchan_caps caps;
   58         uint32_t fmtlist[FMTLIST_MAX];
   59         int trigger;
   60 };
   61 
   62 static void *
   63 vchan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b,
   64     struct pcm_channel *c, int dir)
   65 {
   66         struct vchan_info *info;
   67         struct pcm_channel *p;
   68         uint32_t i, j, *fmtlist;
   69 
   70         KASSERT(dir == PCMDIR_PLAY || dir == PCMDIR_REC,
   71             ("vchan_init: bad direction"));
   72         KASSERT(c != NULL && c->parentchannel != NULL,
   73             ("vchan_init: bad channels"));
   74 
   75         info = malloc(sizeof(*info), M_DEVBUF, M_WAITOK | M_ZERO);
   76         info->channel = c;
   77         info->trigger = PCMTRIG_STOP;
   78         p = c->parentchannel;
   79 
   80         CHN_LOCK(p);
   81 
   82         fmtlist = chn_getcaps(p)->fmtlist;
   83         for (i = 0, j = 0; fmtlist[i] != 0 && j < DIGFMTS_MAX; i++) {
   84                 if (fmtlist[i] & AFMT_PASSTHROUGH)
   85                         info->fmtlist[j++] = fmtlist[i];
   86         }
   87         if (p->format & AFMT_VCHAN)
   88                 info->fmtlist[j] = p->format;
   89         else
   90                 info->fmtlist[j] = VCHAN_DEFAULT_FORMAT;
   91         info->caps.fmtlist = info->fmtlist +
   92             ((p->flags & CHN_F_VCHAN_DYNAMIC) ? 0 : FMTLIST_OFFSET);
   93 
   94         CHN_UNLOCK(p);
   95 
   96         c->flags |= CHN_F_VIRTUAL;
   97 
   98         return (info);
   99 }
  100 
  101 static int
  102 vchan_free(kobj_t obj, void *data)
  103 {
  104 
  105         free(data, M_DEVBUF);
  106 
  107         return (0);
  108 }
  109 
  110 static int
  111 vchan_setformat(kobj_t obj, void *data, uint32_t format)
  112 {
  113         struct vchan_info *info;
  114 
  115         info = data;
  116 
  117         CHN_LOCKASSERT(info->channel);
  118 
  119         if (!snd_fmtvalid(format, info->caps.fmtlist))
  120                 return (-1);
  121 
  122         return (0);
  123 }
  124 
  125 static uint32_t
  126 vchan_setspeed(kobj_t obj, void *data, uint32_t speed)
  127 {
  128         struct vchan_info *info;
  129 
  130         info = data;
  131 
  132         CHN_LOCKASSERT(info->channel);
  133 
  134         return (info->caps.maxspeed);
  135 }
  136 
  137 static int
  138 vchan_trigger(kobj_t obj, void *data, int go)
  139 {
  140         struct vchan_info *info;
  141         struct pcm_channel *c, *p;
  142         int ret, otrigger;
  143 
  144         info = data;
  145 
  146         if (!PCMTRIG_COMMON(go) || go == info->trigger)
  147                 return (0);
  148 
  149         c = info->channel;
  150         p = c->parentchannel;
  151         otrigger = info->trigger;
  152         info->trigger = go;
  153 
  154         CHN_LOCKASSERT(c);
  155 
  156         CHN_UNLOCK(c);
  157         CHN_LOCK(p);
  158 
  159         switch (go) {
  160         case PCMTRIG_START:
  161                 if (otrigger != PCMTRIG_START)
  162                         CHN_INSERT_HEAD(p, c, children.busy);
  163                 break;
  164         case PCMTRIG_STOP:
  165         case PCMTRIG_ABORT:
  166                 if (otrigger == PCMTRIG_START)
  167                         CHN_REMOVE(p, c, children.busy);
  168                 break;
  169         default:
  170                 break;
  171         }
  172 
  173         ret = chn_notify(p, CHN_N_TRIGGER);
  174 
  175         CHN_LOCK(c);
  176 
  177         if (ret == 0 && go == PCMTRIG_START && VCHAN_SYNC_REQUIRED(c))
  178                 ret = vchan_sync(c);
  179 
  180         CHN_UNLOCK(c);
  181         CHN_UNLOCK(p);
  182         CHN_LOCK(c);
  183 
  184         return (ret);
  185 }
  186 
  187 static struct pcmchan_caps *
  188 vchan_getcaps(kobj_t obj, void *data)
  189 {
  190         struct vchan_info *info;
  191         struct pcm_channel *c;
  192         uint32_t pformat, pspeed, pflags, i;
  193 
  194         info = data;
  195         c = info->channel;
  196         pformat = c->parentchannel->format;
  197         pspeed = c->parentchannel->speed;
  198         pflags = c->parentchannel->flags;
  199 
  200         CHN_LOCKASSERT(c);
  201 
  202         if (pflags & CHN_F_VCHAN_DYNAMIC) {
  203                 info->caps.fmtlist = info->fmtlist;
  204                 if (pformat & AFMT_VCHAN) {
  205                         for (i = 0; info->caps.fmtlist[i] != 0; i++) {
  206                                 if (info->caps.fmtlist[i] & AFMT_PASSTHROUGH)
  207                                         continue;
  208                                 break;
  209                         }
  210                         info->caps.fmtlist[i] = pformat;
  211                 }
  212                 if (c->format & AFMT_PASSTHROUGH)
  213                         info->caps.minspeed = c->speed;
  214                 else 
  215                         info->caps.minspeed = pspeed;
  216                 info->caps.maxspeed = info->caps.minspeed;
  217         } else {
  218                 info->caps.fmtlist = info->fmtlist + FMTLIST_OFFSET;
  219                 if (pformat & AFMT_VCHAN)
  220                         info->caps.fmtlist[0] = pformat;
  221                 else {
  222                         device_printf(c->dev,
  223                             "%s(): invalid vchan format 0x%08x",
  224                             __func__, pformat);
  225                         info->caps.fmtlist[0] = VCHAN_DEFAULT_FORMAT;
  226                 }
  227                 info->caps.minspeed = pspeed;
  228                 info->caps.maxspeed = info->caps.minspeed;
  229         }
  230 
  231         return (&info->caps);
  232 }
  233 
  234 static struct pcmchan_matrix *
  235 vchan_getmatrix(kobj_t obj, void *data, uint32_t format)
  236 {
  237 
  238         return (feeder_matrix_format_map(format));
  239 }
  240 
  241 static kobj_method_t vchan_methods[] = {
  242         KOBJMETHOD(channel_init,                vchan_init),
  243         KOBJMETHOD(channel_free,                vchan_free),
  244         KOBJMETHOD(channel_setformat,           vchan_setformat),
  245         KOBJMETHOD(channel_setspeed,            vchan_setspeed),
  246         KOBJMETHOD(channel_trigger,             vchan_trigger),
  247         KOBJMETHOD(channel_getcaps,             vchan_getcaps),
  248         KOBJMETHOD(channel_getmatrix,           vchan_getmatrix),
  249         KOBJMETHOD_END
  250 };
  251 CHANNEL_DECLARE(vchan);
  252 
  253 static void
  254 pcm_getparentchannel(struct snddev_info *d,
  255     struct pcm_channel **wrch, struct pcm_channel **rdch)
  256 {
  257         struct pcm_channel **ch, *wch, *rch, *c;
  258 
  259         KASSERT(d != NULL, ("%s(): NULL snddev_info", __func__));
  260 
  261         PCM_BUSYASSERT(d);
  262         PCM_UNLOCKASSERT(d);
  263 
  264         wch = NULL;
  265         rch = NULL;
  266 
  267         CHN_FOREACH(c, d, channels.pcm) {
  268                 CHN_LOCK(c);
  269                 ch = (c->direction == PCMDIR_PLAY) ? &wch : &rch;
  270                 if (c->flags & CHN_F_VIRTUAL) {
  271                         /* Sanity check */
  272                         if (*ch != NULL && *ch != c->parentchannel) {
  273                                 CHN_UNLOCK(c);
  274                                 *ch = NULL;
  275                                 break;
  276                         }
  277                 } else if (c->flags & CHN_F_HAS_VCHAN) {
  278                         /* No way!! */
  279                         if (*ch != NULL) {
  280                                 CHN_UNLOCK(c);
  281                                 *ch = NULL;
  282                                 break;
  283                         }
  284                         *ch = c;
  285                 }
  286                 CHN_UNLOCK(c);
  287         }
  288 
  289         if (wrch != NULL)
  290                 *wrch = wch;
  291         if (rdch != NULL)
  292                 *rdch = rch;
  293 }
  294 
  295 static int
  296 sysctl_dev_pcm_vchans(SYSCTL_HANDLER_ARGS)
  297 {
  298         struct snddev_info *d;
  299         int direction, vchancount;
  300         int err, cnt;
  301 
  302         d = devclass_get_softc(pcm_devclass, VCHAN_SYSCTL_UNIT(oidp->oid_arg1));
  303         if (!PCM_REGISTERED(d) || !(d->flags & SD_F_AUTOVCHAN))
  304                 return (EINVAL);
  305 
  306         PCM_LOCK(d);
  307         PCM_WAIT(d);
  308 
  309         switch (VCHAN_SYSCTL_DIR(oidp->oid_arg1)) {
  310         case VCHAN_PLAY:
  311                 direction = PCMDIR_PLAY;
  312                 vchancount = d->pvchancount;
  313                 cnt = d->playcount;
  314                 break;
  315         case VCHAN_REC:
  316                 direction = PCMDIR_REC;
  317                 vchancount = d->rvchancount;
  318                 cnt = d->reccount;
  319                 break;
  320         default:
  321                 PCM_UNLOCK(d);
  322                 return (EINVAL);
  323                 break;
  324         }
  325 
  326         if (cnt < 1) {
  327                 PCM_UNLOCK(d);
  328                 return (ENODEV);
  329         }
  330 
  331         PCM_ACQUIRE(d);
  332         PCM_UNLOCK(d);
  333 
  334         cnt = vchancount;
  335         err = sysctl_handle_int(oidp, &cnt, 0, req);
  336 
  337         if (err == 0 && req->newptr != NULL && vchancount != cnt) {
  338                 if (cnt < 0)
  339                         cnt = 0;
  340                 if (cnt > SND_MAXVCHANS)
  341                         cnt = SND_MAXVCHANS;
  342                 err = pcm_setvchans(d, direction, cnt, -1);
  343         }
  344 
  345         PCM_RELEASE_QUICK(d);
  346 
  347         return err;
  348 }
  349 
  350 static int
  351 sysctl_dev_pcm_vchanmode(SYSCTL_HANDLER_ARGS)
  352 {
  353         struct snddev_info *d;
  354         struct pcm_channel *c;
  355         uint32_t dflags;
  356         int direction, ret;
  357         char dtype[16];
  358 
  359         d = devclass_get_softc(pcm_devclass, VCHAN_SYSCTL_UNIT(oidp->oid_arg1));
  360         if (!PCM_REGISTERED(d) || !(d->flags & SD_F_AUTOVCHAN))
  361                 return (EINVAL);
  362 
  363         PCM_LOCK(d);
  364         PCM_WAIT(d);
  365 
  366         switch (VCHAN_SYSCTL_DIR(oidp->oid_arg1)) {
  367         case VCHAN_PLAY:
  368                 direction = PCMDIR_PLAY;
  369                 break;
  370         case VCHAN_REC:
  371                 direction = PCMDIR_REC;
  372                 break;
  373         default:
  374                 PCM_UNLOCK(d);
  375                 return (EINVAL);
  376                 break;
  377         }
  378 
  379         PCM_ACQUIRE(d);
  380         PCM_UNLOCK(d);
  381 
  382         if (direction == PCMDIR_PLAY)
  383                 pcm_getparentchannel(d, &c, NULL);
  384         else
  385                 pcm_getparentchannel(d, NULL, &c);
  386 
  387         if (c == NULL) {
  388                 PCM_RELEASE_QUICK(d);
  389                 return (EINVAL);
  390         }
  391 
  392         KASSERT(direction == c->direction, ("%s(): invalid direction %d/%d",
  393             __func__, direction, c->direction));
  394 
  395         CHN_LOCK(c);
  396         if (c->flags & CHN_F_VCHAN_PASSTHROUGH)
  397                 strlcpy(dtype, "passthrough", sizeof(dtype));
  398         else if (c->flags & CHN_F_VCHAN_ADAPTIVE)
  399                 strlcpy(dtype, "adaptive", sizeof(dtype));
  400         else
  401                 strlcpy(dtype, "fixed", sizeof(dtype));
  402         CHN_UNLOCK(c);
  403 
  404         ret = sysctl_handle_string(oidp, dtype, sizeof(dtype), req);
  405         if (ret == 0 && req->newptr != NULL) {
  406                 if (strcasecmp(dtype, "passthrough") == 0 ||
  407                     strcmp(dtype, "1") == 0)
  408                         dflags = CHN_F_VCHAN_PASSTHROUGH;
  409                 else if (strcasecmp(dtype, "adaptive") == 0 ||
  410                     strcmp(dtype, "2") == 0)
  411                         dflags = CHN_F_VCHAN_ADAPTIVE;
  412                 else if (strcasecmp(dtype, "fixed") == 0 ||
  413                     strcmp(dtype, "") == 0)
  414                         dflags = 0;
  415                 else {
  416                         PCM_RELEASE_QUICK(d);
  417                         return (EINVAL);
  418                 }
  419                 CHN_LOCK(c);
  420                 if (dflags == (c->flags & CHN_F_VCHAN_DYNAMIC) ||
  421                     (c->flags & CHN_F_PASSTHROUGH)) {
  422                         CHN_UNLOCK(c);
  423                         PCM_RELEASE_QUICK(d);
  424                         return (0);
  425                 }
  426                 c->flags &= ~CHN_F_VCHAN_DYNAMIC;
  427                 c->flags |= dflags;
  428                 CHN_UNLOCK(c);
  429         }
  430 
  431         PCM_RELEASE_QUICK(d);
  432 
  433         return (ret);
  434 }
  435 
  436 /* 
  437  * On the fly vchan rate/format settings
  438  */
  439 
  440 #define VCHAN_ACCESSIBLE(c)     (!((c)->flags & (CHN_F_PASSTHROUGH |    \
  441                                  CHN_F_EXCLUSIVE)) &&                   \
  442                                  (((c)->flags & CHN_F_VCHAN_DYNAMIC) || \
  443                                  CHN_STOPPED(c)))
  444 static int
  445 sysctl_dev_pcm_vchanrate(SYSCTL_HANDLER_ARGS)
  446 {
  447         struct snddev_info *d;
  448         struct pcm_channel *c, *ch;
  449         struct pcmchan_caps *caps;
  450         int *vchanrate, vchancount, direction, ret, newspd, restart;
  451 
  452         d = devclass_get_softc(pcm_devclass, VCHAN_SYSCTL_UNIT(oidp->oid_arg1));
  453         if (!PCM_REGISTERED(d) || !(d->flags & SD_F_AUTOVCHAN))
  454                 return (EINVAL);
  455 
  456         PCM_LOCK(d);
  457         PCM_WAIT(d);
  458 
  459         switch (VCHAN_SYSCTL_DIR(oidp->oid_arg1)) {
  460         case VCHAN_PLAY:
  461                 direction = PCMDIR_PLAY;
  462                 vchancount = d->pvchancount;
  463                 vchanrate = &d->pvchanrate;
  464                 break;
  465         case VCHAN_REC:
  466                 direction = PCMDIR_REC;
  467                 vchancount = d->rvchancount;
  468                 vchanrate = &d->rvchanrate;
  469                 break;
  470         default:
  471                 PCM_UNLOCK(d);
  472                 return (EINVAL);
  473                 break;
  474         }
  475 
  476         if (vchancount < 1) {
  477                 PCM_UNLOCK(d);
  478                 return (EINVAL);
  479         }
  480 
  481         PCM_ACQUIRE(d);
  482         PCM_UNLOCK(d);
  483 
  484         if (direction == PCMDIR_PLAY)
  485                 pcm_getparentchannel(d, &c, NULL);
  486         else
  487                 pcm_getparentchannel(d, NULL, &c);
  488 
  489         if (c == NULL) {
  490                 PCM_RELEASE_QUICK(d);
  491                 return (EINVAL);
  492         }
  493 
  494         KASSERT(direction == c->direction, ("%s(): invalid direction %d/%d",
  495             __func__, direction, c->direction));
  496 
  497         CHN_LOCK(c);
  498         newspd = c->speed;
  499         CHN_UNLOCK(c);
  500 
  501         ret = sysctl_handle_int(oidp, &newspd, 0, req);
  502         if (ret != 0 || req->newptr == NULL) {
  503                 PCM_RELEASE_QUICK(d);
  504                 return (ret);
  505         }
  506 
  507         if (newspd < 1 || newspd < feeder_rate_min ||
  508             newspd > feeder_rate_max) {
  509                 PCM_RELEASE_QUICK(d);
  510                 return (EINVAL);
  511         }
  512 
  513         CHN_LOCK(c);
  514 
  515         if (newspd != c->speed && VCHAN_ACCESSIBLE(c)) {
  516                 if (CHN_STARTED(c)) {
  517                         chn_abort(c);
  518                         restart = 1;
  519                 } else
  520                         restart = 0;
  521 
  522                 if (feeder_rate_round) {
  523                         caps = chn_getcaps(c);
  524                         RANGE(newspd, caps->minspeed, caps->maxspeed);
  525                         newspd = CHANNEL_SETSPEED(c->methods,
  526                             c->devinfo, newspd);
  527                 }
  528 
  529                 ret = chn_reset(c, c->format, newspd);
  530                 if (ret == 0) {
  531                         *vchanrate = c->speed;
  532                         if (restart != 0) {
  533                                 CHN_FOREACH(ch, c, children.busy) {
  534                                         CHN_LOCK(ch);
  535                                         if (VCHAN_SYNC_REQUIRED(ch))
  536                                                 vchan_sync(ch);
  537                                         CHN_UNLOCK(ch);
  538                                 }
  539                                 c->flags |= CHN_F_DIRTY;
  540                                 ret = chn_start(c, 1);
  541                         }
  542                 }
  543         }
  544 
  545         CHN_UNLOCK(c);
  546 
  547         PCM_RELEASE_QUICK(d);
  548 
  549         return (ret);
  550 }
  551 
  552 static int
  553 sysctl_dev_pcm_vchanformat(SYSCTL_HANDLER_ARGS)
  554 {
  555         struct snddev_info *d;
  556         struct pcm_channel *c, *ch;
  557         uint32_t newfmt;
  558         int *vchanformat, vchancount, direction, ret, restart;
  559         char fmtstr[AFMTSTR_LEN];
  560 
  561         d = devclass_get_softc(pcm_devclass, VCHAN_SYSCTL_UNIT(oidp->oid_arg1));
  562         if (!PCM_REGISTERED(d) || !(d->flags & SD_F_AUTOVCHAN))
  563                 return (EINVAL);
  564 
  565         PCM_LOCK(d);
  566         PCM_WAIT(d);
  567 
  568         switch (VCHAN_SYSCTL_DIR(oidp->oid_arg1)) {
  569         case VCHAN_PLAY:
  570                 direction = PCMDIR_PLAY;
  571                 vchancount = d->pvchancount;
  572                 vchanformat = &d->pvchanformat;
  573                 break;
  574         case VCHAN_REC:
  575                 direction = PCMDIR_REC;
  576                 vchancount = d->rvchancount;
  577                 vchanformat = &d->rvchanformat;
  578                 break;
  579         default:
  580                 PCM_UNLOCK(d);
  581                 return (EINVAL);
  582                 break;
  583         }
  584 
  585         if (vchancount < 1) {
  586                 PCM_UNLOCK(d);
  587                 return (EINVAL);
  588         }
  589 
  590         PCM_ACQUIRE(d);
  591         PCM_UNLOCK(d);
  592 
  593         if (direction == PCMDIR_PLAY)
  594                 pcm_getparentchannel(d, &c, NULL);
  595         else
  596                 pcm_getparentchannel(d, NULL, &c);
  597 
  598         if (c == NULL) {
  599                 PCM_RELEASE_QUICK(d);
  600                 return (EINVAL);
  601         }
  602 
  603         KASSERT(direction == c->direction, ("%s(): invalid direction %d/%d",
  604             __func__, direction, c->direction));
  605 
  606         CHN_LOCK(c);
  607 
  608         bzero(fmtstr, sizeof(fmtstr));
  609 
  610         if (snd_afmt2str(c->format, fmtstr, sizeof(fmtstr)) != c->format)
  611                 strlcpy(fmtstr, "<ERROR>", sizeof(fmtstr));
  612 
  613         CHN_UNLOCK(c);
  614 
  615         ret = sysctl_handle_string(oidp, fmtstr, sizeof(fmtstr), req);
  616         if (ret != 0 || req->newptr == NULL) {
  617                 PCM_RELEASE_QUICK(d);
  618                 return (ret);
  619         }
  620 
  621         newfmt = snd_str2afmt(fmtstr);
  622         if (newfmt == 0 || !(newfmt & AFMT_VCHAN)) {
  623                 PCM_RELEASE_QUICK(d);
  624                 return (EINVAL);
  625         }
  626 
  627         CHN_LOCK(c);
  628 
  629         if (newfmt != c->format && VCHAN_ACCESSIBLE(c)) {
  630                 if (CHN_STARTED(c)) {
  631                         chn_abort(c);
  632                         restart = 1;
  633                 } else
  634                         restart = 0;
  635 
  636                 ret = chn_reset(c, newfmt, c->speed);
  637                 if (ret == 0) {
  638                         *vchanformat = c->format;
  639                         if (restart != 0) {
  640                                 CHN_FOREACH(ch, c, children.busy) {
  641                                         CHN_LOCK(ch);
  642                                         if (VCHAN_SYNC_REQUIRED(ch))
  643                                                 vchan_sync(ch);
  644                                         CHN_UNLOCK(ch);
  645                                 }
  646                                 c->flags |= CHN_F_DIRTY;
  647                                 ret = chn_start(c, 1);
  648                         }
  649                 }
  650         }
  651 
  652         CHN_UNLOCK(c);
  653 
  654         PCM_RELEASE_QUICK(d);
  655 
  656         return (ret);
  657 }
  658 
  659 /* virtual channel interface */
  660 
  661 #define VCHAN_FMT_HINT(x)       ((x) == PCMDIR_PLAY_VIRTUAL) ?          \
  662                                 "play.vchanformat" : "rec.vchanformat"
  663 #define VCHAN_SPD_HINT(x)       ((x) == PCMDIR_PLAY_VIRTUAL) ?          \
  664                                 "play.vchanrate" : "rec.vchanrate"
  665 
  666 int
  667 vchan_create(struct pcm_channel *parent, int num)
  668 {
  669         struct snddev_info *d;
  670         struct pcm_channel *ch;
  671         struct pcmchan_caps *parent_caps;
  672         uint32_t vchanfmt, vchanspd;
  673         int ret, direction, r, save;
  674 
  675         d = parent->parentsnddev;
  676 
  677         PCM_BUSYASSERT(d);
  678         CHN_LOCKASSERT(parent);
  679 
  680         if (!(parent->flags & CHN_F_BUSY))
  681                 return (EBUSY);
  682 
  683         if (!(parent->direction == PCMDIR_PLAY ||
  684             parent->direction == PCMDIR_REC))
  685                 return (EINVAL);
  686 
  687         d = parent->parentsnddev;
  688 
  689         CHN_UNLOCK(parent);
  690         PCM_LOCK(d);
  691 
  692         if (parent->direction == PCMDIR_PLAY) {
  693                 direction = PCMDIR_PLAY_VIRTUAL;
  694                 vchanfmt = d->pvchanformat;
  695                 vchanspd = d->pvchanrate;
  696         } else {
  697                 direction = PCMDIR_REC_VIRTUAL;
  698                 vchanfmt = d->rvchanformat;
  699                 vchanspd = d->rvchanrate;
  700         }
  701 
  702         /* create a new playback channel */
  703         ch = pcm_chn_create(d, parent, &vchan_class, direction, num, parent);
  704         if (ch == NULL) {
  705                 PCM_UNLOCK(d);
  706                 CHN_LOCK(parent);
  707                 return (ENODEV);
  708         }
  709 
  710         /* add us to our grandparent's channel list */
  711         ret = pcm_chn_add(d, ch);
  712         PCM_UNLOCK(d);
  713         if (ret != 0) {
  714                 pcm_chn_destroy(ch);
  715                 CHN_LOCK(parent);
  716                 return (ret);
  717         }
  718 
  719         CHN_LOCK(parent);
  720         /*
  721          * Add us to our parent channel's children in reverse order
  722          * so future destruction will pick the last (biggest number)
  723          * channel.
  724          */
  725         CHN_INSERT_SORT_DESCEND(parent, ch, children);
  726 
  727         if (parent->flags & CHN_F_HAS_VCHAN)
  728                 return (0);
  729 
  730         parent->flags |= CHN_F_HAS_VCHAN;
  731 
  732         parent_caps = chn_getcaps(parent);
  733         if (parent_caps == NULL)
  734                 ret = EINVAL;
  735 
  736         save = 0;
  737 
  738         if (ret == 0 && vchanfmt == 0) {
  739                 const char *vfmt;
  740 
  741                 CHN_UNLOCK(parent);
  742                 r = resource_string_value(device_get_name(parent->dev),
  743                     device_get_unit(parent->dev), VCHAN_FMT_HINT(direction),
  744                     &vfmt);
  745                 CHN_LOCK(parent);
  746                 if (r != 0)
  747                         vfmt = NULL;
  748                 if (vfmt != NULL) {
  749                         vchanfmt = snd_str2afmt(vfmt);
  750                         if (vchanfmt != 0 && !(vchanfmt & AFMT_VCHAN))
  751                                 vchanfmt = 0;
  752                 }
  753                 if (vchanfmt == 0)
  754                         vchanfmt = VCHAN_DEFAULT_FORMAT;
  755                 save = 1;
  756         }
  757 
  758         if (ret == 0 && vchanspd == 0) {
  759                 /*
  760                  * This is very sad. Few soundcards advertised as being
  761                  * able to do (insanely) higher/lower speed, but in
  762                  * reality, they simply can't. At least, we give user chance
  763                  * to set sane value via kernel hints or sysctl.
  764                  */
  765                 CHN_UNLOCK(parent);
  766                 r = resource_int_value(device_get_name(parent->dev),
  767                     device_get_unit(parent->dev), VCHAN_SPD_HINT(direction),
  768                     &vchanspd);
  769                 CHN_LOCK(parent);
  770                 if (r != 0) {
  771                         /*
  772                          * No saved value, no hint, NOTHING.
  773                          *
  774                          * Workaround for sb16 running
  775                          * poorly at 45k / 49k.
  776                          */
  777                         switch (parent_caps->maxspeed) {
  778                         case 45000:
  779                         case 49000:
  780                                 vchanspd = 44100;
  781                                 break;
  782                         default:
  783                                 vchanspd = VCHAN_DEFAULT_RATE;
  784                                 if (vchanspd > parent_caps->maxspeed)
  785                                         vchanspd = parent_caps->maxspeed;
  786                                 break;
  787                         }
  788                         if (vchanspd < parent_caps->minspeed)
  789                                 vchanspd = parent_caps->minspeed;
  790                 }
  791                 save = 1;
  792         }
  793 
  794         if (ret == 0) {
  795                 /*
  796                  * Limit the speed between feeder_rate_min <-> feeder_rate_max.
  797                  */
  798                 if (vchanspd < feeder_rate_min)
  799                         vchanspd = feeder_rate_min;
  800                 if (vchanspd > feeder_rate_max)
  801                         vchanspd = feeder_rate_max;
  802 
  803                 if (feeder_rate_round) {
  804                         RANGE(vchanspd, parent_caps->minspeed,
  805                             parent_caps->maxspeed);
  806                         vchanspd = CHANNEL_SETSPEED(parent->methods,
  807                             parent->devinfo, vchanspd);
  808                 }
  809 
  810                 ret = chn_reset(parent, vchanfmt, vchanspd);
  811         }
  812 
  813         if (ret == 0 && save) {
  814                 /*
  815                  * Save new value.
  816                  */
  817                 if (direction == PCMDIR_PLAY_VIRTUAL) {
  818                         d->pvchanformat = parent->format;
  819                         d->pvchanrate = parent->speed;
  820                 } else {
  821                         d->rvchanformat = parent->format;
  822                         d->rvchanrate = parent->speed;
  823                 }
  824         }
  825         
  826         /*
  827          * If the parent channel supports digital format,
  828          * enable passthrough mode.
  829          */
  830         if (ret == 0 && snd_fmtvalid(AFMT_PASSTHROUGH, parent_caps->fmtlist)) {
  831                 parent->flags &= ~CHN_F_VCHAN_DYNAMIC;
  832                 parent->flags |= CHN_F_VCHAN_PASSTHROUGH;
  833         }
  834 
  835         if (ret != 0) {
  836                 CHN_REMOVE(parent, ch, children);
  837                 parent->flags &= ~CHN_F_HAS_VCHAN;
  838                 CHN_UNLOCK(parent);
  839                 PCM_LOCK(d);
  840                 if (pcm_chn_remove(d, ch) == 0) {
  841                         PCM_UNLOCK(d);
  842                         pcm_chn_destroy(ch);
  843                 } else
  844                         PCM_UNLOCK(d);
  845                 CHN_LOCK(parent);
  846         }
  847 
  848         return (ret);
  849 }
  850 
  851 int
  852 vchan_destroy(struct pcm_channel *c)
  853 {
  854         struct pcm_channel *parent;
  855         struct snddev_info *d;
  856         int ret;
  857 
  858         KASSERT(c != NULL && c->parentchannel != NULL &&
  859             c->parentsnddev != NULL, ("%s(): invalid channel=%p",
  860             __func__, c));
  861 
  862         CHN_LOCKASSERT(c);
  863 
  864         d = c->parentsnddev;
  865         parent = c->parentchannel;
  866 
  867         PCM_BUSYASSERT(d);
  868         CHN_LOCKASSERT(parent);
  869 
  870         CHN_UNLOCK(c);
  871 
  872         if (!(parent->flags & CHN_F_BUSY))
  873                 return (EBUSY);
  874 
  875         if (CHN_EMPTY(parent, children))
  876                 return (EINVAL);
  877 
  878         /* remove us from our parent's children list */
  879         CHN_REMOVE(parent, c, children);
  880 
  881         if (CHN_EMPTY(parent, children)) {
  882                 parent->flags &= ~(CHN_F_BUSY | CHN_F_HAS_VCHAN);
  883                 chn_reset(parent, parent->format, parent->speed);
  884         }
  885 
  886         CHN_UNLOCK(parent);
  887 
  888         /* remove us from our grandparent's channel list */
  889         PCM_LOCK(d);
  890         ret = pcm_chn_remove(d, c);
  891         PCM_UNLOCK(d);
  892 
  893         /* destroy ourselves */
  894         if (ret == 0)
  895                 ret = pcm_chn_destroy(c);
  896 
  897         CHN_LOCK(parent);
  898 
  899         return (ret);
  900 }
  901 
  902 int
  903 #ifdef SND_DEBUG
  904 vchan_passthrough(struct pcm_channel *c, const char *caller)
  905 #else
  906 vchan_sync(struct pcm_channel *c)
  907 #endif
  908 {
  909         int ret;
  910 
  911         KASSERT(c != NULL && c->parentchannel != NULL &&
  912             (c->flags & CHN_F_VIRTUAL),
  913             ("%s(): invalid passthrough", __func__));
  914         CHN_LOCKASSERT(c);
  915         CHN_LOCKASSERT(c->parentchannel);
  916 
  917         sndbuf_setspd(c->bufhard, c->parentchannel->speed);
  918         c->flags |= CHN_F_PASSTHROUGH;
  919         ret = feeder_chain(c);
  920         c->flags &= ~(CHN_F_DIRTY | CHN_F_PASSTHROUGH);
  921         if (ret != 0)
  922                 c->flags |= CHN_F_DIRTY;
  923 
  924 #ifdef SND_DEBUG
  925         if (snd_passthrough_verbose != 0) {
  926                 char *devname, buf[CHN_NAMELEN];
  927 
  928                 devname = dsp_unit2name(buf, sizeof(buf), c->unit);
  929                 device_printf(c->dev,
  930                     "%s(%s/%s) %s() -> re-sync err=%d\n",
  931                     __func__, (devname != NULL) ? devname : "dspX", c->comm,
  932                     caller, ret);
  933         }
  934 #endif
  935 
  936         return (ret);
  937 }
  938 
  939 void
  940 vchan_initsys(device_t dev)
  941 {
  942         struct snddev_info *d;
  943         int unit;
  944 
  945         unit = device_get_unit(dev);
  946         d = device_get_softc(dev);
  947 
  948         /* Play */
  949         SYSCTL_ADD_PROC(&d->play_sysctl_ctx,
  950             SYSCTL_CHILDREN(d->play_sysctl_tree),
  951             OID_AUTO, "vchans", CTLTYPE_INT | CTLFLAG_RWTUN,
  952             VCHAN_SYSCTL_DATA(unit, PLAY), VCHAN_SYSCTL_DATA_SIZE,
  953             sysctl_dev_pcm_vchans, "I", "total allocated virtual channel");
  954         SYSCTL_ADD_PROC(&d->play_sysctl_ctx,
  955             SYSCTL_CHILDREN(d->play_sysctl_tree),
  956             OID_AUTO, "vchanmode", CTLTYPE_STRING | CTLFLAG_RWTUN,
  957             VCHAN_SYSCTL_DATA(unit, PLAY), VCHAN_SYSCTL_DATA_SIZE,
  958             sysctl_dev_pcm_vchanmode, "A",
  959             "vchan format/rate selection: 0=fixed, 1=passthrough, 2=adaptive");
  960         SYSCTL_ADD_PROC(&d->play_sysctl_ctx,
  961             SYSCTL_CHILDREN(d->play_sysctl_tree),
  962             OID_AUTO, "vchanrate", CTLTYPE_INT | CTLFLAG_RWTUN,
  963             VCHAN_SYSCTL_DATA(unit, PLAY), VCHAN_SYSCTL_DATA_SIZE,
  964             sysctl_dev_pcm_vchanrate, "I", "virtual channel mixing speed/rate");
  965         SYSCTL_ADD_PROC(&d->play_sysctl_ctx,
  966             SYSCTL_CHILDREN(d->play_sysctl_tree),
  967             OID_AUTO, "vchanformat", CTLTYPE_STRING | CTLFLAG_RWTUN,
  968             VCHAN_SYSCTL_DATA(unit, PLAY), VCHAN_SYSCTL_DATA_SIZE,
  969             sysctl_dev_pcm_vchanformat, "A", "virtual channel mixing format");
  970         /* Rec */
  971         SYSCTL_ADD_PROC(&d->rec_sysctl_ctx,
  972             SYSCTL_CHILDREN(d->rec_sysctl_tree),
  973             OID_AUTO, "vchans", CTLTYPE_INT | CTLFLAG_RWTUN,
  974             VCHAN_SYSCTL_DATA(unit, REC), VCHAN_SYSCTL_DATA_SIZE,
  975             sysctl_dev_pcm_vchans, "I", "total allocated virtual channel");
  976         SYSCTL_ADD_PROC(&d->rec_sysctl_ctx,
  977             SYSCTL_CHILDREN(d->rec_sysctl_tree),
  978             OID_AUTO, "vchanmode", CTLTYPE_STRING | CTLFLAG_RWTUN,
  979             VCHAN_SYSCTL_DATA(unit, REC), VCHAN_SYSCTL_DATA_SIZE,
  980             sysctl_dev_pcm_vchanmode, "A",
  981             "vchan format/rate selection: 0=fixed, 1=passthrough, 2=adaptive");
  982         SYSCTL_ADD_PROC(&d->rec_sysctl_ctx,
  983             SYSCTL_CHILDREN(d->rec_sysctl_tree),
  984             OID_AUTO, "vchanrate", CTLTYPE_INT | CTLFLAG_RWTUN,
  985             VCHAN_SYSCTL_DATA(unit, REC), VCHAN_SYSCTL_DATA_SIZE,
  986             sysctl_dev_pcm_vchanrate, "I", "virtual channel mixing speed/rate");
  987         SYSCTL_ADD_PROC(&d->rec_sysctl_ctx,
  988             SYSCTL_CHILDREN(d->rec_sysctl_tree),
  989             OID_AUTO, "vchanformat", CTLTYPE_STRING | CTLFLAG_RWTUN,
  990             VCHAN_SYSCTL_DATA(unit, REC), VCHAN_SYSCTL_DATA_SIZE,
  991             sysctl_dev_pcm_vchanformat, "A", "virtual channel mixing format");
  992 }

Cache object: 1b7729472a50ab25ad65a6ffa3b28e61


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