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/fake.c

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    1 /*-
    2  * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: src/sys/dev/sound/pcm/fake.c,v 1.14.2.1 2005/12/30 19:55:54 netchild Exp $
   27  */
   28 
   29 #include <dev/sound/pcm/sound.h>
   30 
   31 
   32 static u_int32_t fk_fmt[] = {
   33         AFMT_MU_LAW,
   34         AFMT_STEREO | AFMT_MU_LAW,
   35         AFMT_A_LAW,
   36         AFMT_STEREO | AFMT_A_LAW,
   37         AFMT_U8,
   38         AFMT_STEREO | AFMT_U8,
   39         AFMT_S8,
   40         AFMT_STEREO | AFMT_S8,
   41         AFMT_S16_LE,
   42         AFMT_STEREO | AFMT_S16_LE,
   43         AFMT_U16_LE,
   44         AFMT_STEREO | AFMT_U16_LE,
   45         AFMT_S16_BE,
   46         AFMT_STEREO | AFMT_S16_BE,
   47         AFMT_U16_BE,
   48         AFMT_STEREO | AFMT_U16_BE,
   49         AFMT_S24_LE,
   50         AFMT_STEREO | AFMT_S24_LE,
   51         AFMT_U24_LE,
   52         AFMT_STEREO | AFMT_U24_LE,
   53         AFMT_S24_BE,
   54         AFMT_STEREO | AFMT_S24_BE,
   55         AFMT_U24_BE,
   56         AFMT_STEREO | AFMT_U24_BE,
   57         AFMT_S32_LE,
   58         AFMT_STEREO | AFMT_S32_LE,
   59         AFMT_U32_LE,
   60         AFMT_STEREO | AFMT_U32_LE,
   61         AFMT_S32_BE,
   62         AFMT_STEREO | AFMT_S32_BE,
   63         AFMT_U32_BE,
   64         AFMT_STEREO | AFMT_U32_BE,
   65         0
   66 };
   67 static struct pcmchan_caps fk_caps = {0, 1000000, fk_fmt, 0};
   68 
   69 #define FKBUFSZ 4096
   70 static char fakebuf[FKBUFSZ];
   71 
   72 /* channel interface */
   73 static void *
   74 fkchan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
   75 {
   76         sndbuf_setup(b, fakebuf, FKBUFSZ);
   77         return (void *)0xbabef00d;
   78 }
   79 
   80 static int
   81 fkchan_free(kobj_t obj, void *data)
   82 {
   83         return 0;
   84 }
   85 
   86 static int
   87 fkchan_setformat(kobj_t obj, void *data, u_int32_t format)
   88 {
   89         return 0;
   90 }
   91 
   92 static int
   93 fkchan_setspeed(kobj_t obj, void *data, u_int32_t speed)
   94 {
   95         return speed;
   96 }
   97 
   98 static int
   99 fkchan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
  100 {
  101         return blocksize;
  102 }
  103 
  104 static int
  105 fkchan_trigger(kobj_t obj, void *data, int go)
  106 {
  107         return 0;
  108 }
  109 
  110 static int
  111 fkchan_getptr(kobj_t obj, void *data)
  112 {
  113         return 0;
  114 }
  115 
  116 static struct pcmchan_caps *
  117 fkchan_getcaps(kobj_t obj, void *data)
  118 {
  119         return &fk_caps;
  120 }
  121 
  122 static kobj_method_t fkchan_methods[] = {
  123         KOBJMETHOD(channel_init,                fkchan_init),
  124         KOBJMETHOD(channel_free,                fkchan_free),
  125         KOBJMETHOD(channel_setformat,           fkchan_setformat),
  126         KOBJMETHOD(channel_setspeed,            fkchan_setspeed),
  127         KOBJMETHOD(channel_setblocksize,        fkchan_setblocksize),
  128         KOBJMETHOD(channel_trigger,             fkchan_trigger),
  129         KOBJMETHOD(channel_getptr,              fkchan_getptr),
  130         KOBJMETHOD(channel_getcaps,             fkchan_getcaps),
  131         KOBJMETHOD_END
  132 };
  133 CHANNEL_DECLARE(fkchan);
  134 
  135 struct pcm_channel *
  136 fkchan_setup(device_t dev)
  137 {
  138         struct snddev_info *d = device_get_softc(dev);
  139         struct pcm_channel *c;
  140 
  141         c = kmalloc(sizeof(*c), M_DEVBUF, M_WAITOK);
  142         c->methods = kobj_create(&fkchan_class, M_DEVBUF, M_WAITOK);
  143         c->parentsnddev = d;
  144         /*
  145          * Fake channel is such a blessing in disguise. Using this,
  146          * we can keep track prefered virtual channel speed without
  147          * querying kernel hint repetitively (see vchan_create / vchan.c).
  148          */
  149         c->speed = 0;
  150         ksnprintf(c->name, CHN_NAMELEN, "%s:fake", device_get_nameunit(dev));
  151 
  152         return c;
  153 }
  154 
  155 int
  156 fkchan_kill(struct pcm_channel *c)
  157 {
  158         kobj_delete(c->methods, M_DEVBUF);
  159         c->methods = NULL;
  160         kfree(c, M_DEVBUF);
  161         return 0;
  162 }
  163 
  164 

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