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/*
* Schism Tracker - a cross-platform Impulse Tracker clone
* copyright (c) 2003-2005 Storlek <storlek@rigelseven.com>
* copyright (c) 2005-2008 Mrs. Brisby <mrs.brisby@nimh.org>
* copyright (c) 2009 Storlek & Mrs. Brisby
* copyright (c) 2010-2012 Storlek
* URL: http://schismtracker.org/
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "headers.h"
#include "util.h"
#include "log.h"
#ifdef USE_OSS
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <errno.h>
#include <fcntl.h>
/* Hmm. I've found that some systems actually don't support the idea of a
* "master" volume, so this became necessary. I suppose PCM is really the
* more useful setting to change anyway. */
#if 0
# define SCHISM_MIXER_CONTROL SOUND_MIXER_VOLUME
#else
# define SCHISM_MIXER_CONTROL SOUND_MIXER_PCM
#endif
#define VOLUME_MAX 100
/* --------------------------------------------------------------------- */
static const char *device_file = NULL;
/* --------------------------------------------------------------------- */
static int open_mixer_device(void)
{
const char *ptr;
if (!device_file) {
ptr = "/dev/sound/mixer";
if (access(ptr, F_OK) < 0) {
/* this had better work :) */
ptr = "/dev/mixer";
}
device_file = ptr;
}
return open(device_file, O_RDWR);
}
/* --------------------------------------------------------------------- */
int oss_volume_get_max(void);
int oss_volume_get_max(void)
{
return VOLUME_MAX;
}
void oss_volume_read(int *left, int *right);
void oss_volume_read(int *left, int *right)
{
int fd;
uint8_t volume[4];
fd = open_mixer_device();
if (fd < 0) {
log_perror(device_file);
*left = *right = 0;
return;
}
if (ioctl(fd, MIXER_READ(SCHISM_MIXER_CONTROL), volume) == EOF) {
log_perror(device_file);
*left = *right = 0;
} else {
*left = volume[0];
*right = volume[1];
}
close(fd);
}
void oss_volume_write(int left, int right);
void oss_volume_write(int left, int right)
{
int fd;
uint8_t volume[4];
volume[0] = CLAMP(left, 0, VOLUME_MAX);
volume[1] = CLAMP(right, 0, VOLUME_MAX);
fd = open_mixer_device();
if (fd < 0) {
log_perror(device_file);
return;
}
if (ioctl(fd, MIXER_WRITE(SCHISM_MIXER_CONTROL), volume) == EOF) {
log_perror(device_file);
}
close(fd);
}
#endif
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