1 /* mix.c - A very basic mixer.
2 *
3 * Copyright 2014 Brad Conroy, dedicated to the Public Domain.
4 *
5
6 USE_MIX(NEWTOY(mix, "c:d:l#r#", TOYFLAG_USR|TOYFLAG_BIN))
7
8 config MIX
9 bool "mix"
10 default y
11 help
12 usage: mix [-d DEV] [-c CHANNEL] [-l VOL] [-r RIGHT]
13
14 List OSS sound channels (module snd-mixer-oss), or set volume(s).
15
16 -c CHANNEL Set/show volume of CHANNEL (default first channel found)
17 -d DEV Device node (default /dev/mixer)
18 -l VOL Volume level
19 -r RIGHT Volume of right stereo channel (with -r, -l sets left volume)
20 */
21
22 #define FOR_mix
23 #include "toys.h"
24 #include <linux/soundcard.h>
25
26 GLOBALS(
27 long r, l;
28 char *d, *c;
29 )
30
mix_main(void)31 void mix_main(void)
32 {
33 const char *channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
34 int mask, channel = -1, level, fd;
35
36 if (!TT.d) TT.d = "/dev/mixer";
37 fd = xopen(TT.d, O_RDWR|O_NONBLOCK);
38 xioctl(fd, SOUND_MIXER_READ_DEVMASK, &mask);
39
40 for (channel = 0; channel < SOUND_MIXER_NRDEVICES; channel++) {
41 if ((1<<channel) & mask) {
42 if (TT.c) {
43 if (!strcmp(channels[channel], TT.c)) break;
44 } else if (toys.optflags & FLAG_l) break;
45 else printf("%s\n", channels[channel]);
46 }
47 }
48
49 if (!(toys.optflags & (FLAG_c|FLAG_l))) return;
50 else if (channel == SOUND_MIXER_NRDEVICES) error_exit("bad -c '%s'", TT.c);
51
52 if (!(toys.optflags & FLAG_l)) {
53 xioctl(fd, MIXER_READ(channel), &level);
54 if (level > 0xFF)
55 xprintf("%s:%s = left:%d\t right:%d\n",
56 TT.d, channels[channel], level>>8, level & 0xFF);
57 else xprintf("%s:%s = %d\n", TT.d, channels[channel], level);
58 } else {
59 level = TT.l;
60 if (!(toys.optflags & FLAG_r)) level = TT.r | (level<<8);
61
62 xioctl(fd, MIXER_WRITE(channel), &level);
63 }
64
65 if (CFG_TOYBOX_FREE) close(fd);
66 }
67