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 
   27 #include <dev/sound/pcm/sound.h>
   28 
   29 SND_DECLARE_FILE("$FreeBSD: releng/6.3/sys/dev/sound/pcm/fake.c 153901 2005-12-30 19:55:55Z netchild $");
   30 
   31 static u_int32_t fk_fmt[] = {
   32         AFMT_MU_LAW,
   33         AFMT_STEREO | AFMT_MU_LAW,
   34         AFMT_A_LAW,
   35         AFMT_STEREO | AFMT_A_LAW,
   36         AFMT_U8,
   37         AFMT_STEREO | AFMT_U8,
   38         AFMT_S8,
   39         AFMT_STEREO | AFMT_S8,
   40         AFMT_S16_LE,
   41         AFMT_STEREO | AFMT_S16_LE,
   42         AFMT_U16_LE,
   43         AFMT_STEREO | AFMT_U16_LE,
   44         AFMT_S16_BE,
   45         AFMT_STEREO | AFMT_S16_BE,
   46         AFMT_U16_BE,
   47         AFMT_STEREO | AFMT_U16_BE,
   48         AFMT_S24_LE,
   49         AFMT_STEREO | AFMT_S24_LE,
   50         AFMT_U24_LE,
   51         AFMT_STEREO | AFMT_U24_LE,
   52         AFMT_S24_BE,
   53         AFMT_STEREO | AFMT_S24_BE,
   54         AFMT_U24_BE,
   55         AFMT_STEREO | AFMT_U24_BE,
   56         AFMT_S32_LE,
   57         AFMT_STEREO | AFMT_S32_LE,
   58         AFMT_U32_LE,
   59         AFMT_STEREO | AFMT_U32_LE,
   60         AFMT_S32_BE,
   61         AFMT_STEREO | AFMT_S32_BE,
   62         AFMT_U32_BE,
   63         AFMT_STEREO | AFMT_U32_BE,
   64         0
   65 };
   66 static struct pcmchan_caps fk_caps = {0, 1000000, fk_fmt, 0};
   67 
   68 #define FKBUFSZ 4096
   69 static char fakebuf[FKBUFSZ];
   70 
   71 /* channel interface */
   72 static void *
   73 fkchan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
   74 {
   75         sndbuf_setup(b, fakebuf, FKBUFSZ);
   76         return (void *)0xbabef00d;
   77 }
   78 
   79 static int
   80 fkchan_free(kobj_t obj, void *data)
   81 {
   82         return 0;
   83 }
   84 
   85 static int
   86 fkchan_setformat(kobj_t obj, void *data, u_int32_t format)
   87 {
   88         return 0;
   89 }
   90 
   91 static int
   92 fkchan_setspeed(kobj_t obj, void *data, u_int32_t speed)
   93 {
   94         return speed;
   95 }
   96 
   97 static int
   98 fkchan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
   99 {
  100         return blocksize;
  101 }
  102 
  103 static int
  104 fkchan_trigger(kobj_t obj, void *data, int go)
  105 {
  106         return 0;
  107 }
  108 
  109 static int
  110 fkchan_getptr(kobj_t obj, void *data)
  111 {
  112         return 0;
  113 }
  114 
  115 static struct pcmchan_caps *
  116 fkchan_getcaps(kobj_t obj, void *data)
  117 {
  118         return &fk_caps;
  119 }
  120 
  121 static kobj_method_t fkchan_methods[] = {
  122         KOBJMETHOD(channel_init,                fkchan_init),
  123         KOBJMETHOD(channel_free,                fkchan_free),
  124         KOBJMETHOD(channel_setformat,           fkchan_setformat),
  125         KOBJMETHOD(channel_setspeed,            fkchan_setspeed),
  126         KOBJMETHOD(channel_setblocksize,        fkchan_setblocksize),
  127         KOBJMETHOD(channel_trigger,             fkchan_trigger),
  128         KOBJMETHOD(channel_getptr,              fkchan_getptr),
  129         KOBJMETHOD(channel_getcaps,             fkchan_getcaps),
  130         { 0, 0 }
  131 };
  132 CHANNEL_DECLARE(fkchan);
  133 
  134 struct pcm_channel *
  135 fkchan_setup(device_t dev)
  136 {
  137         struct snddev_info *d = device_get_softc(dev);
  138         struct pcm_channel *c;
  139 
  140         c = malloc(sizeof(*c), M_DEVBUF, M_WAITOK);
  141         c->methods = kobj_create(&fkchan_class, M_DEVBUF, M_WAITOK);
  142         c->parentsnddev = d;
  143         /*
  144          * Fake channel is such a blessing in disguise. Using this,
  145          * we can keep track prefered virtual channel speed without
  146          * querying kernel hint repetitively (see vchan_create / vchan.c).
  147          */
  148         c->speed = 0;
  149         snprintf(c->name, CHN_NAMELEN, "%s:fake", device_get_nameunit(dev));
  150 
  151         return c;
  152 }
  153 
  154 int
  155 fkchan_kill(struct pcm_channel *c)
  156 {
  157         kobj_delete(c->methods, M_DEVBUF);
  158         c->methods = NULL;
  159         free(c, M_DEVBUF);
  160         return 0;
  161 }
  162 
  163 

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