mdw@git.distorted.org.uk Git - disorder/blob - lib/mixer.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2007 Richard Kettlewell
   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 2 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, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * 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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include <config.h>
  22 #include "types.h"
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <stddef.h>
  31 #include <sys/ioctl.h>
  32
  33 #include "configuration.h"
  34 #include "mixer.h"
  35 #include "log.h"
  36 #include "syscalls.h"
  37
  38 static const struct mixer *mixers[] = {
  39 #if HAVE_SYS_SOUNDCARD_H
  40   &mixer_oss
  41 #endif
  42 };
  43
  44 #define NMIXERS (sizeof mixers / sizeof *mixers)
  45
  46 static const struct mixer *find_mixer(int api) {
  47   size_t n;
  48
  49   for(n = 0; n < NMIXERS; ++n)
  50     if(mixers[n]->api == api)
  51       return mixers[n];
  52   return 0;
  53 }
  54
  55 int mixer_valid_channel(int api, const char *c) {
  56   const struct mixer *const m = find_mixer(api);
  57
  58   return m ? m->validate_channel(c) : 1;
  59 }
  60
  61 int mixer_valid_device(int api, const char *d) {
  62   const struct mixer *const m = find_mixer(api);
  63
  64   return m ? m->validate_device(d) : 1;
  65 }
  66
  67 int mixer_control(int *left, int *right, int set) {
  68   const struct mixer *const m = find_mixer(config->api);
  69
  70   if(m) {
  71     if(set)
  72       return m->set(left, right);
  73     else
  74       return m->get(left, right);
  75   } else {
  76     static int reported;
  77
  78     if(!reported) {
  79       error(0, "don't know how to get/set volume with this api");
  80       reported = 1;
  81     }
  82     return -1;
  83   }
  84 }
  85
  86 const char *mixer_default_device(int api) {
  87   const struct mixer *const m = find_mixer(api);
  88
  89   return m ? m->device : "";
  90 }
  91
  92 const char *mixer_default_channel(int api) {
  93   const struct mixer *const m = find_mixer(api);
  94
  95   return m ? m->channel : "";
  96 }
  97
  98 /*
  99 Local Variables:
 100 c-basic-offset:2
 101 comment-column:40
 102 End:
 103 */