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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