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/*
* Library to query / set various sound mixer parameters.
*
* This code is based on setmixer program by Michal Jaegermann
*
* Copyright (c) 2000 Sergey Gribov <sergey@sergey.com>
* This is free software with ABSOLUTELY NO WARRANTY.
* You can redistribute and modify it freely, but please leave
* this message attached to this file.
*
* Subject to terms of GNU General Public License (www.gnu.org)
*
* Last update: $Date: 2002/04/30 00:48:21 $ by $Author: sergey $
* Revision: $Revision: 1.5 $
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include "Mix.h"
#define BUFSIZE 512
const char * dname[] = SOUND_DEVICE_NAMES;
static int devmask, stereod, recmask, mixer_fd = -1, init_flag = 0;
static char dev_fname[BUFSIZE] = "";
int
set_mixer_dev(char *fname) {
#ifdef DEBUG
fprintf(stderr, "set_mixer_dev(%s)\n", fname);
#endif
strncpy(dev_fname, fname, BUFSIZE-1);
return(0);
}
int
open_mixer() {
#ifdef DEBUG
fprintf(stderr, "open_mixer()\n");
#endif
if (dev_fname[0] == '\0') {
strncpy(dev_fname, MIXER, BUFSIZE-1);
}
if ((mixer_fd = open(dev_fname, O_RDWR)) < 0) {
fprintf(stderr, "Error opening %s.", MIXER);
return(-1);
}
if (ioctl(mixer_fd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
perror("SOUND_MIXER_READ_DEVMASK");
return(-1);
}
if (ioctl(mixer_fd, SOUND_MIXER_READ_STEREODEVS, &stereod) == -1) {
perror("SOUND_MIXER_READ_STEREODEVS");
return(-1);
}
if (ioctl(mixer_fd, SOUND_MIXER_READ_RECMASK, &recmask) == -1) {
perror("SOUND_MIXER_READ_RECMASK");
return(-1);
}
if (!devmask) {
fprintf(stderr, "No device found.");
return(-1);
}
return(0);
}
int
close_mixer() {
#ifdef DEBUG
fprintf(stderr, "close_mixer()\n");
#endif
if (mixer_fd < 0) return(0);
close(mixer_fd);
init_flag = 0;
mixer_fd = -1;
return(0);
}
/*
* Get parameter value
* Parameter:
* cntrl - name of parameter
* Returns:
* integer value, which will be constructed as follows:
* lower byte (x & 0xff) - value of the left channel (or whole value)
* next byte (x & 0xff00) - value of the right channel
* third byte (x & 0xff0000) - flags (if x & 0x10000 then 2 channels exist)
*/
int
get_param_val(char *cntrl) {
int i, d, len, lcval, ret = 0;
#ifdef DEBUG
fprintf(stderr, "get_param_val(%s)\n", cntrl);
#endif
if (!init_flag) {
if (open_mixer()) {
return(-1);
}
}
len = strlen(cntrl);
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
d = (1 << i);
if ((0 == strncmp(dname[i], cntrl, len)) &&
(0 != (devmask & d))) {
if (-1 == ioctl(mixer_fd, MIXER_READ(i), &lcval)) {
perror("MIXER_READ");
if (!init_flag)
close_mixer();
return(-1);
}
else {
ret = lcval & 0x7f;
if (d & stereod) {
ret = ret | 0x10000;
ret = ret | (lcval & 0x7f00);
if (!init_flag)
close_mixer();
return(ret);
}
}
}
}
if (!init_flag)
close_mixer();
return(-1);
}
char *
get_source()
{
int j;
unsigned int source = 0;
if (!init_flag){
if (open_mixer())
return("");
}
if (-1 == ioctl(mixer_fd, SOUND_MIXER_READ_RECSRC, &source)){
perror("MIXER_READ_RECSRC");
if (!init_flag)
close_mixer();
return("");
}
if (!init_flag)
close_mixer();
source &= recmask;
for (j = 0; source; source >>= 1, j++){
if (source & 1)
return((char *) dname[j]);
}
return("");
}
int
set_source(char *cntrl)
{
int i, d, len, ret = 0;
#ifdef DEBUG
fprintf(stderr, "set_recsrc(%s)\n", cntrl);
#endif
if (!init_flag) {
if (open_mixer()) {
return(-1);
}
}
len = strlen(cntrl);
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
d = (1 << i);
if ((0 == strncmp(dname[i], cntrl, len)) &&
(0 != (recmask & d))) {
if (-1 == ioctl(mixer_fd, SOUND_MIXER_WRITE_RECSRC, &d)) {
perror("MIXER_WRITE_RECSRC");
if (!init_flag)
close_mixer();
return(-1);
}
else {
if (!init_flag)
close_mixer();
return(0);
}
}
}
d = 0;
if (-1 == ioctl(mixer_fd, SOUND_MIXER_WRITE_RECSRC, &d)) {
perror("MIXER_WRITE_RECSRC");
if (!init_flag)
close_mixer();
return(-1);
}
if (!init_flag)
close_mixer();
return(0);
}
/*
* Set parameter value.
* Parameters:
* cntrl - name of parameter
* lcval - left channel value
* rcval - right channel value
* Returns 0 if Ok, -1 if failed
*/
int
set_param_val(char *cntrl, int lcval, int rcval) {
int len, i, d;
#ifdef DEBUG
fprintf(stderr, "set_param_val(%s, %d, %d)\n", cntrl, lcval, rcval);
#endif
if (!init_flag) {
if (open_mixer()) {
return(-1);
}
}
len = strlen(cntrl);
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");
if (!init_flag)
close_mixer();
return(-1);
}
}
break;
}
}
if (!init_flag)
close_mixer();
return(0);
}
int
init_mixer() {
if (open_mixer()) {
return(-1);
}
init_flag = 1;
return(0);
}
int
get_params_num() {
return(SOUND_MIXER_NRDEVICES);
}
char *
get_params_list() {
static char buf[BUFSIZE];
int i, l, len = 0;
buf[0] = '\0';
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
l = strlen(dname[i]);
if ((len >= (BUFSIZE - 2)) || ((len + l + 3) >= BUFSIZE)) {
buf[len] = '\0';
return(buf);
}
strcat(buf, dname[i]);
strcat(buf, " ");
len += l + 1;
}
buf[len] = '\0';
return(buf);
}
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