kernel/core/sound/audio.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <system.h>
  21 #include <sound/audio.h>
  22 #include <dev.h>
  23
  24 snd_audio_t snd_audio_list;
  25
  26 /* find audio structure by specified device */
  27 snd_audio_t *audio_find (dev_t *dev)
  28 {
  29         snd_audio_t *aud;
  30         for (aud = snd_audio_list.next; aud != &snd_audio_list; aud = aud->next) {
  31                 if (aud->dev == dev)
  32                         return aud;
  33         }
  34
  35         return 0;
  36 }
  37
  38 /* open audio sound system (prepare sound card to play) */
  39 snd_audio_t *audio_open (snd_cfg_t *cfg)
  40 {
  41         if (!cfg->dev || !cfg->rate || !cfg->format)
  42                 return 0;
  43
  44         dev_t *dev = dev_find (cfg->dev);
  45
  46         if (!dev)
  47                 return 0;
  48
  49         if (!(dev->attrib & DEV_ATTR_SOUND))
  50                 return 0;
  51
  52         /* we dont accept multiple device using yet */
  53         if (audio_find (dev))
  54                 return 0;
  55
  56         /* alloc and init context */
  57         snd_audio_t *aud = (snd_audio_t *) kmalloc (sizeof (snd_audio_t));
  58
  59         if (!aud)
  60                 return 0;
  61
  62         aud->dev = dev;
  63         aud->rate = cfg->rate;
  64         aud->format = cfg->format;
  65         aud->channels = cfg->channels;
  66         aud->flags = cfg->flags;
  67
  68         printf ("rate: %d f: %d, ch: %d\n", aud->rate, aud->format, aud->channels);
  69
  70         /* add into list */
  71         aud->next = &snd_audio_list;
  72         aud->prev = snd_audio_list.prev;
  73         aud->prev->next = aud;
  74         aud->next->prev = aud;
  75
  76         /* setup sound card */
  77         dev->handler (DEV_ACT_UPDATE, (void *) aud, sizeof (snd_audio_t));
  78
  79         return aud;
  80 }
  81
  82 /* write data into device buffer */
  83 int audio_write (snd_audio_t *aud, char *buf, unsigned len)
  84 {
  85         if (!aud || !buf || !len)
  86                 return -1;
  87
  88         aud->dev->handler (DEV_ACT_WRITE, buf, len);
  89
  90         return 0;
  91 }
  92
  93 int audio_close (snd_audio_t *aud)
  94 {
  95         if (!aud)
  96                 return -1;
  97
  98         aud->next->prev = aud->prev;
  99         aud->prev->next = aud->next;
 100
 101         aud->rate = 0;
 102         aud->format = 0;
 103         aud->channels = 0;
 104         aud->flags = 0;
 105
 106         aud->dev->handler (DEV_ACT_UPDATE, (void *) aud, sizeof (snd_audio_t));
 107
 108         kfree (aud);
 109
 110         return 0;
 111 }
 112
 113 /* init function of sound system */
 114 unsigned int init_audio ()
 115 {
 116         snd_audio_list.next = &snd_audio_list;
 117         snd_audio_list.prev = &snd_audio_list;
 118
 119         return 1;
 120 }