2 * This file is part of DisOrder
3 * Copyright (C) 2004 Richard Kettlewell
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.
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.
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
31 #include <sys/ioctl.h>
33 #include "configuration.h"
38 #if HAVE_SYS_SOUNDCARD_H
39 #include <sys/soundcard.h>
41 /* documentation does not match implementation! */
42 #ifndef SOUND_MIXER_READ
43 # define SOUND_MIXER_READ(x) MIXER_READ(x)
45 #ifndef SOUND_MIXER_WRITE
46 # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x)
49 static const char *channels[] = SOUND_DEVICE_NAMES;
51 int mixer_channel(const char *c) {
54 if(!c[strspn(c, "0123456789")])
57 for(n = 0; n < sizeof channels / sizeof *channels; ++n)
58 if(!strcmp(channels[n], c))
64 int mixer_control(int *left, int *right, int set) {
69 && (ch = mixer_channel(config->channel)) != -1) {
70 if((fd = open(config->mixer, O_RDWR, 0)) < 0) {
71 error(errno, "error opening %s", config->mixer);
75 r = (*left & 0xff) + (*right & 0xff) * 256;
76 if(ioctl(fd, SOUND_MIXER_WRITE(ch), &r) == -1) {
77 error(errno, "error changing %s channel %s",
78 config->mixer, config->channel);
83 if(ioctl(fd, SOUND_MIXER_READ(ch), &r) == -1) {
84 error(errno, "error reading %s channel %s",
85 config->mixer, config->channel);
90 *right = (r >> 8) & 0xff;
97 int mixer_channel(const char attribute((unused)) *c) {
101 int mixer_control(int attribute((unused)) *left,
102 int attribute((unused)) *right,
103 int attribute((unused)) set) {
107 error(0, "don't know how to set volume on this platform");