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/* mix.c - A very basic mixer.
*
* Copyright 2014 Brad Conroy, dedicated to the Public Domain.
*
USE_MIX(NEWTOY(mix, "c:d:l#r#", TOYFLAG_USR|TOYFLAG_BIN))
config MIX
bool "mix"
default y
help
usage: mix [-d DEV] [-c CHANNEL] [-l VOL] [-r RIGHT]
List OSS sound channels (module snd-mixer-oss), or set volume(s).
-c CHANNEL Set/show volume of CHANNEL (default first channel found)
-d DEV Device node (default /dev/mixer)
-l VOL Volume level
-r RIGHT Volume of right stereo channel (with -r, -l sets left volume)
*/
#define FOR_mix
#include "toys.h"
#include <linux/soundcard.h>
GLOBALS(
long right;
long level;
char *dev;
char *chan;
)
void mix_main(void)
{
const char *channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
int mask, channel = -1, level, fd;
if (!TT.dev) TT.dev = "/dev/mixer";
fd = xopen(TT.dev, O_RDWR|O_NONBLOCK);
xioctl(fd, SOUND_MIXER_READ_DEVMASK, &mask);
for (channel = 0; channel < SOUND_MIXER_NRDEVICES; channel++) {
if ((1<<channel) & mask) {
if (TT.chan) {
if (!strcmp(channels[channel], TT.chan)) break;
} else if (toys.optflags & FLAG_l) break;
else printf("%s\n", channels[channel]);
}
}
if (!(toys.optflags & (FLAG_c|FLAG_l))) return;
else if (channel == SOUND_MIXER_NRDEVICES) error_exit("bad -c '%s'", TT.chan);
if (!(toys.optflags & FLAG_l)) {
xioctl(fd, MIXER_READ(channel), &level);
if (level > 0xFF)
xprintf("%s:%s = left:%d\t right:%d\n",
TT.dev, channels[channel], level>>8, level & 0xFF);
else xprintf("%s:%s = %d\n", TT.dev, channels[channel], level);
} else {
level = TT.level;
if (!(toys.optflags & FLAG_r)) level = TT.right | (level<<8);
xioctl(fd, MIXER_WRITE(channel), &level);
}
if (CFG_TOYBOX_FREE) close(fd);
}
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