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/*
* setmixer -
* simple program to set various sound mixer parameters from a command
* line; can be put into rc.local to have an automatic startup
* initialization
*
* usage: ./setmixer [-V] cntrl val [cntrl val ....]
* where val is in 0-100 range and 'cntrl' is one of the following:
* vol bass treble synth pcm speaker line mic cd mix pcm2 rec
* When controlling
* Option -V will display current/set values.
*
* Compile with the following command:
* gcc -s -O6 -fomit-frame-pointer -Wall -pipe -m486 \
* -Xlinker -qmagic -o setmixer setmixer.c
*
* Michal Jaegermann, 27 Dec 1994
* This program is released under terms of GNU General Program Licence.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#define MIXER "/dev/mixer"
const char * dname[] = SOUND_DEVICE_NAMES;
int
main(int argc, const char **argv) {
int devmask, stereod, i, d;
int mixer_fd;
int lcval,rcval,oldlcval,oldrcval,val;
int verbose = 0;
size_t len;
char *endptr;
const char *cntrl;
const char *prog = *argv++;
argc -= 1;
if (argc > 0) {
if (0 == strcmp(*argv, "-V")) {
verbose = 1;
argv++;
argc -= 1;
}
}
if ((!verbose && ((argc <= 0) || (argc & 1))) || (verbose && argc % 2)) {
fprintf(stderr, "usage: %s [-V] cntrl val [cntrl val ....]\n"
"where val is in [+-]0-100 range and 'cntrl' is one of the following:\n\t",
prog);
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
fprintf(stderr, "%s ", dname[i]);
fprintf(stderr, "\n"
"('lchannel,rchannel' pairs can be given as 'val' for "
"stereo controls)\n");
exit(1);
}
if ((mixer_fd = open(MIXER, O_RDWR)) < 0) {
fprintf(stderr, "Error opening /dev/mixer.");
exit(1);
}
if (ioctl(mixer_fd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
perror("SOUND_MIXER_READ_DEVMASK");
exit(-1);
}
if (ioctl(mixer_fd, SOUND_MIXER_READ_STEREODEVS, &stereod) == -1) {
perror("SOUND_MIXER_READ_STEREODEVS");
exit(-1);
}
if (!devmask) {
fprintf(stderr, "No device found.");
exit(-1);
}
while (argc) {
cntrl = *argv++;
oldlcval = (('+' == **argv) || ('-' == **argv));
lcval = strtol(*argv++, &endptr, 0);
if (',' == *endptr) {
endptr += 1;
oldrcval = (('+' == *endptr) || ('-' == *endptr));
rcval = strtol((const char *)endptr, 0, 0);
}
else {
rcval = lcval;
oldrcval = oldlcval;
}
argc -= 2;
len = strlen(cntrl);
if (oldlcval || oldrcval) {
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (0 == strncmp(dname[i], cntrl, len)) {
d = (1 << i);
if (0 != (devmask & d)) {
if (-1 == ioctl(mixer_fd, MIXER_READ(i), &val)) {
perror("MIXER_READ");
}
else {
lcval += oldlcval ? (val & 0x7f) : 0;
rcval += oldrcval ? ((val >> 8) & 0x7f) : 0;
}
}
break;
}
}
}
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (0 == strncmp(dname[i], cntrl, len)) {
d = (1 << i);
if (0 != (devmask & d)) {
lcval = (lcval < 0 ? 0 : (lcval > 100 ? 100 : lcval));
if (d & stereod) {
rcval = (rcval < 0 ? 0 : (rcval > 100 ? 100 : rcval));
lcval |= (rcval << 8);
}
if (-1 == ioctl(mixer_fd, MIXER_WRITE(i), &lcval)) {
perror("MIXER_WRITE");
}
}
break;
}
}
}
if (verbose) {
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
d = (1 << i);
if (0 != (devmask & d)) {
if (-1 == ioctl(mixer_fd, MIXER_READ(i), &lcval)) {
perror("MIXER_READ");
}
else {
printf("%7s - ", dname[i]);
printf("%d", lcval & 0x7f);
if (d & stereod)
printf(",%d", (lcval >> 8) & 0x7f);
printf("\n");
}
}
}
}
return 0;
}
/*
* Local variables:
* compile-command: "gcc -s -O6 -fomit-frame-pointer -Wall -pipe -m486 -Xlinker -N -o setmixer setmixer.c"
* End:
*/
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