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  * Copyright (c) 2001 Cameron Grant <gandalf@vilnya.demon.co.uk>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <dev/sound/pcm/sound.h>
   28 #include <dev/sound/pcm/vchan.h>
   29 #include "feeder_if.h"
   30 
   31 SND_DECLARE_FILE("$FreeBSD: releng/5.0/sys/dev/sound/pcm/vchan.c 107237 2002-11-25 17:17:43Z cg $");
   32 
   33 struct vchinfo {
   34         u_int32_t spd, fmt, blksz, bps, run;
   35         struct pcm_channel *channel, *parent;
   36         struct pcmchan_caps caps;
   37 };
   38 
   39 static u_int32_t vchan_fmt[] = {
   40         AFMT_S16_LE,
   41         AFMT_STEREO | AFMT_S16_LE,
   42         0
   43 };
   44 
   45 static int
   46 vchan_mix_s16(int16_t *to, int16_t *tmp, unsigned int count)
   47 {
   48         /*
   49          * to is the output buffer, tmp is the input buffer
   50          * count is the number of 16bit samples to mix
   51          */
   52         int i;
   53         int x;
   54 
   55         for(i = 0; i < count; i++) {
   56                 x = to[i];
   57                 x += tmp[i];
   58                 if (x < -32768) {
   59                         /* printf("%d + %d = %d (u)\n", to[i], tmp[i], x); */
   60                         x = -32768;
   61                 }
   62                 if (x > 32767) {
   63                         /* printf("%d + %d = %d (o)\n", to[i], tmp[i], x); */
   64                         x = 32767;
   65                 }
   66                 to[i] = x & 0x0000ffff;
   67         }
   68         return 0;
   69 }
   70 
   71 static int
   72 feed_vchan_s16(struct pcm_feeder *f, struct pcm_channel *c, u_int8_t *b, u_int32_t count, void *source)
   73 {
   74         /* we're going to abuse things a bit */
   75         struct snd_dbuf *src = source;
   76         struct pcmchan_children *cce;
   77         struct pcm_channel *ch;
   78         int16_t *tmp, *dst;
   79         unsigned int cnt;
   80 
   81         KASSERT(sndbuf_getsize(src) >= count, ("bad bufsize"));
   82         count &= ~1;
   83         bzero(b, count);
   84 
   85         /*
   86          * we are going to use our source as a temporary buffer since it's
   87          * got no other purpose.  we obtain our data by traversing the channel
   88          * list of children and calling vchan_mix_* to mix count bytes from each
   89          * into our destination buffer, b
   90          */
   91         dst = (int16_t *)b;
   92         tmp = (int16_t *)sndbuf_getbuf(src);
   93         bzero(tmp, count);
   94         SLIST_FOREACH(cce, &c->children, link) {
   95                 ch = cce->channel;
   96                 if (ch->flags & CHN_F_TRIGGERED) {
   97                         if (ch->flags & CHN_F_MAPPED)
   98                                 sndbuf_acquire(ch->bufsoft, NULL, sndbuf_getfree(ch->bufsoft));
   99                         cnt = FEEDER_FEED(ch->feeder, ch, (u_int8_t *)tmp, count, ch->bufsoft);
  100                         vchan_mix_s16(dst, tmp, cnt / 2);
  101                 }
  102         }
  103 
  104         return count;
  105 }
  106 
  107 static struct pcm_feederdesc feeder_vchan_s16_desc[] = {
  108         {FEEDER_MIXER, AFMT_S16_LE, AFMT_S16_LE, 0},
  109         {FEEDER_MIXER, AFMT_S16_LE | AFMT_STEREO, AFMT_S16_LE | AFMT_STEREO, 0},
  110         {0},
  111 };
  112 static kobj_method_t feeder_vchan_s16_methods[] = {
  113         KOBJMETHOD(feeder_feed,         feed_vchan_s16),
  114         { 0, 0 }
  115 };
  116 FEEDER_DECLARE(feeder_vchan_s16, 2, NULL);
  117 
  118 /************************************************************/
  119 
  120 static void *
  121 vchan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
  122 {
  123         struct vchinfo *ch;
  124         struct pcm_channel *parent = devinfo;
  125 
  126         KASSERT(dir == PCMDIR_PLAY, ("vchan_init: bad direction"));
  127         ch = malloc(sizeof(*ch), M_DEVBUF, M_WAITOK | M_ZERO);
  128         ch->parent = parent;
  129         ch->channel = c;
  130         ch->fmt = AFMT_U8;
  131         ch->spd = DSP_DEFAULT_SPEED;
  132         ch->blksz = 2048;
  133 
  134         c->flags |= CHN_F_VIRTUAL;
  135 
  136         return ch;
  137 }
  138 
  139 static int
  140 vchan_free(kobj_t obj, void *data)
  141 {
  142         return 0;
  143 }
  144 
  145 static int
  146 vchan_setformat(kobj_t obj, void *data, u_int32_t format)
  147 {
  148         struct vchinfo *ch = data;
  149         struct pcm_channel *parent = ch->parent;
  150 
  151         ch->fmt = format;
  152         ch->bps = 1;
  153         ch->bps <<= (ch->fmt & AFMT_STEREO)? 1 : 0;
  154         ch->bps <<= (ch->fmt & AFMT_16BIT)? 1 : 0;
  155         ch->bps <<= (ch->fmt & AFMT_32BIT)? 2 : 0;
  156         chn_notify(parent, CHN_N_FORMAT);
  157         return 0;
  158 }
  159 
  160 static int
  161 vchan_setspeed(kobj_t obj, void *data, u_int32_t speed)
  162 {
  163         struct vchinfo *ch = data;
  164         struct pcm_channel *parent = ch->parent;
  165 
  166         ch->spd = speed;
  167         chn_notify(parent, CHN_N_RATE);
  168         return speed;
  169 }
  170 
  171 static int
  172 vchan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
  173 {
  174         struct vchinfo *ch = data;
  175         struct pcm_channel *parent = ch->parent;
  176         int prate, crate;
  177 
  178         ch->blksz = blocksize;
  179         chn_notify(parent, CHN_N_BLOCKSIZE);
  180 
  181         crate = ch->spd * ch->bps;
  182         prate = sndbuf_getspd(parent->bufhard) * sndbuf_getbps(parent->bufhard);
  183         blocksize = sndbuf_getblksz(parent->bufhard);
  184         blocksize *= prate;
  185         blocksize /= crate;
  186 
  187         return blocksize;
  188 }
  189 
  190 static int
  191 vchan_trigger(kobj_t obj, void *data, int go)
  192 {
  193         struct vchinfo *ch = data;
  194         struct pcm_channel *parent = ch->parent;
  195 
  196         if (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD)
  197                 return 0;
  198 
  199         ch->run = (go == PCMTRIG_START)? 1 : 0;
  200         chn_notify(parent, CHN_N_TRIGGER);
  201 
  202         return 0;
  203 }
  204 
  205 static struct pcmchan_caps *
  206 vchan_getcaps(kobj_t obj, void *data)
  207 {
  208         struct vchinfo *ch = data;
  209 
  210         ch->caps.minspeed = sndbuf_getspd(ch->parent->bufhard);
  211         ch->caps.maxspeed = ch->caps.minspeed;
  212         ch->caps.fmtlist = vchan_fmt;
  213         ch->caps.caps = 0;
  214 
  215         return &ch->caps;
  216 }
  217 
  218 static kobj_method_t vchan_methods[] = {
  219         KOBJMETHOD(channel_init,                vchan_init),
  220         KOBJMETHOD(channel_free,                vchan_free),
  221         KOBJMETHOD(channel_setformat,           vchan_setformat),
  222         KOBJMETHOD(channel_setspeed,            vchan_setspeed),
  223         KOBJMETHOD(channel_setblocksize,        vchan_setblocksize),
  224         KOBJMETHOD(channel_trigger,             vchan_trigger),
  225         KOBJMETHOD(channel_getcaps,             vchan_getcaps),
  226         { 0, 0 }
  227 };
  228 CHANNEL_DECLARE(vchan);
  229 
  230 /* virtual channel interface */
  231 
  232 int
  233 vchan_create(struct pcm_channel *parent)
  234 {
  235         struct snddev_info *d = parent->parentsnddev;
  236         struct pcmchan_children *pce;
  237         struct pcm_channel *child;
  238         int err, first;
  239 
  240         pce = malloc(sizeof(*pce), M_DEVBUF, M_WAITOK | M_ZERO);
  241         if (!pce) {
  242                 return ENOMEM;
  243         }
  244 
  245         /* create a new playback channel */
  246         child = pcm_chn_create(d, parent, &vchan_class, PCMDIR_VIRTUAL, parent);
  247         if (!child) {
  248                 free(pce, M_DEVBUF);
  249                 return ENODEV;
  250         }
  251 
  252         CHN_LOCK(parent);
  253         if (!(parent->flags & CHN_F_BUSY)) {
  254                 CHN_UNLOCK(parent);
  255                 return EBUSY;
  256         }
  257 
  258         first = SLIST_EMPTY(&parent->children);
  259         /* add us to our parent channel's children */
  260         pce->channel = child;
  261         SLIST_INSERT_HEAD(&parent->children, pce, link);
  262         CHN_UNLOCK(parent);
  263 
  264         /* add us to our grandparent's channel list */
  265         err = pcm_chn_add(d, child, !first);
  266         if (err) {
  267                 pcm_chn_destroy(child);
  268                 free(pce, M_DEVBUF);
  269         }
  270 
  271         /* XXX gross ugly hack, murder death kill */
  272         if (first && !err) {
  273                 err = chn_reset(parent, AFMT_STEREO | AFMT_S16_LE);
  274                 if (err)
  275                         printf("chn_reset: %d\n", err);
  276                 err = chn_setspeed(parent, 44100);
  277                 if (err)
  278                         printf("chn_setspeed: %d\n", err);
  279         }
  280 
  281         return err;
  282 }
  283 
  284 int
  285 vchan_destroy(struct pcm_channel *c)
  286 {
  287         struct pcm_channel *parent = c->parentchannel;
  288         struct snddev_info *d = parent->parentsnddev;
  289         struct pcmchan_children *pce;
  290         int err, last;
  291 
  292         CHN_LOCK(parent);
  293         if (!(parent->flags & CHN_F_BUSY)) {
  294                 CHN_UNLOCK(parent);
  295                 return EBUSY;
  296         }
  297         if (SLIST_EMPTY(&parent->children)) {
  298                 CHN_UNLOCK(parent);
  299                 return EINVAL;
  300         }
  301 
  302         /* remove us from our parent's children list */
  303         SLIST_FOREACH(pce, &parent->children, link) {
  304                 if (pce->channel == c)
  305                         goto gotch;
  306         }
  307         CHN_UNLOCK(parent);
  308         return EINVAL;
  309 gotch:
  310         SLIST_REMOVE(&parent->children, pce, pcmchan_children, link);
  311         free(pce, M_DEVBUF);
  312 
  313         last = SLIST_EMPTY(&parent->children);
  314         if (last)
  315                 parent->flags &= ~CHN_F_BUSY;
  316 
  317         /* remove us from our grantparent's channel list */
  318         err = pcm_chn_remove(d, c, !last);
  319         if (err)
  320                 return err;
  321 
  322         CHN_UNLOCK(parent);
  323         /* destroy ourselves */
  324         err = pcm_chn_destroy(c);
  325 
  326         return err;
  327 }
  328 
  329 int
  330 vchan_initsys(device_t dev)
  331 {
  332 #ifdef SND_DYNSYSCTL
  333         struct snddev_info *d;
  334 
  335         d = device_get_softc(dev);
  336         SYSCTL_ADD_PROC(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)),
  337             OID_AUTO, "vchans", CTLTYPE_INT | CTLFLAG_RW, d, sizeof(d),
  338             sysctl_hw_snd_vchans, "I", "");
  339 #endif
  340 
  341         return 0;
  342 }
  343 
  344 

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