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/* Copyright (C) 1994 - 1996
Olav Woelfelschneider (wosch@rbg.informatik.th-darmstadt.de)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "../config.h"
#include "volume.h"
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/soundcard.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
static int mixer = -1;
extern char *mixer_name;
extern const unsigned char *sources[];
extern char *myname;
int mix_open(int request) {
if (mixer<0) {
int devmask;
mixer = open(mixer_name, O_RDONLY);
if (mixer<0) return -1;
if (ioctl(mixer, SOUND_MIXER_READ_DEVMASK, &devmask)<0) {
fprintf(stderr, _("%s: failed to read mixer capabilities.\n"), myname);
goto fail;
}
if (!(devmask & (1<<request))) {
fprintf(stderr, _("%s: mixer id `%s' not supported by your system.\n"),
myname, sources[request]);
errno=ENODEV;
goto fail;
}
}
return mixer;
fail:
close(mixer);
return -1;
}
void mix_close() {
if (mixer>=0) {
close(mixer);
mixer=-1;
}
}
int mix_set_volume(int req, int *left, int *right) {
int res,n;
if (mixer>=0) {
if ((*left>=0) && (*right>=0)) {
n = (*left & 0x7F) + ((*right & 0x7F)<<8);
res=ioctl(mixer, MIXER_WRITE(req), &n);
} else {
res=0;
}
if (res>=0) {
res=ioctl(mixer,MIXER_READ(req), &n);
*left = n&0x7F;
*right = (n>>8)&0x7F;
}
} else
res=-1;
if (res<0) *left = *right = 0;
return res;
}
int mix_get_volume(int req, int *left, int *right) {
int res,n;
if (mixer>=0) {
res=ioctl(mixer, MIXER_READ(req), &n);
*left = n&0x7F;
*right = (n>>8)&0x7F;
} else
res=-1;
if (res<0) *left = *right = 0;
return res;
}
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