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
30 #include <sys/ioctl.h>
32 #include "configuration.h"
37 #if HAVE_SYS_SOUNDCARD_H
38 #include <sys/soundcard.h>
40 /* documentation does not match implementation! */
41 #ifndef SOUND_MIXER_READ
42 # define SOUND_MIXER_READ(x) MIXER_READ(x)
44 #ifndef SOUND_MIXER_WRITE
45 # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x)
48 static const char *channels
[] = SOUND_DEVICE_NAMES
;
50 int mixer_channel(const char *c
) {
53 if(!c
[strspn(c
, "0123456789")])
56 for(n
= 0; n
< sizeof channels
/ sizeof *channels
; ++n
)
57 if(!strcmp(channels
[n
], c
))
63 int mixer_control(int *left
, int *right
, int set
) {
68 && (ch
= mixer_channel(config
->channel
)) != -1) {
69 if((fd
= open(config
->mixer
, O_RDWR
, 0)) < 0) {
70 error(errno
, "error opening %s", config
->mixer
);
74 r
= (*left
& 0xff) + (*right
& 0xff) * 256;
75 if(ioctl(fd
, SOUND_MIXER_WRITE(ch
), &r
) == -1) {
76 error(errno
, "error changing %s channel %s",
77 config
->mixer
, config
->channel
);
82 if(ioctl(fd
, SOUND_MIXER_READ(ch
), &r
) == -1) {
83 error(errno
, "error reading %s channel %s",
84 config
->mixer
, config
->channel
);
89 *right
= (r
>> 8) & 0xff;
96 int mixer_channel(const char attribute((unused
)) *c
) {
100 int mixer_control(int attribute((unused
)) *left
,
101 int attribute((unused
)) *right
,
102 int attribute((unused
)) set
) {
106 error(0, "don't know how to set volume on this platform");