1 /* mix.c - A very basic mixer.
3 * Copyright 2014 Brad Conroy, dedicated to the Public Domain.
6 USE_MIX(NEWTOY(mix, "c:d:l#r#", TOYFLAG_USR|TOYFLAG_BIN))
12 usage: mix [-d DEV] [-c CHANNEL] [-l VOL] [-r RIGHT]
14 List OSS sound channels (module snd-mixer-oss), or set volume(s).
16 -c CHANNEL Set/show volume of CHANNEL (default first channel found)
17 -d DEV Device node (default /dev/mixer)
19 -r RIGHT Volume of right stereo channel (with -r, -l sets left volume)
24 #include <linux/soundcard.h>
35 const char *channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
36 int mask, channel = -1, level, fd;
38 if (!TT.dev) TT.dev = "/dev/mixer";
39 fd = xopen(TT.dev, O_RDWR|O_NONBLOCK);
40 xioctl(fd, SOUND_MIXER_READ_DEVMASK, &mask);
42 for (channel = 0; channel < SOUND_MIXER_NRDEVICES; channel++) {
43 if ((1<<channel) & mask) {
45 if (!strcmp(channels[channel], TT.chan)) break;
46 } else if (toys.optflags & FLAG_l) break;
47 else printf("%s\n", channels[channel]);
51 if (!(toys.optflags & (FLAG_c|FLAG_l))) return;
52 else if (channel == SOUND_MIXER_NRDEVICES) error_exit("bad -c '%s'", TT.chan);
54 if (!(toys.optflags & FLAG_l)) {
55 xioctl(fd, MIXER_READ(channel), &level);
57 xprintf("%s:%s = left:%d\t right:%d\n",
58 TT.dev, channels[channel], level>>8, level & 0xFF);
59 else xprintf("%s:%s = %d\n", TT.dev, channels[channel], level);
62 if (!(toys.optflags & FLAG_r)) level = TT.right | (level<<8);
64 xioctl(fd, MIXER_WRITE(channel), &level);
67 if (CFG_TOYBOX_FREE) close(fd);