#ifndef lint
static char rcsid[] =
"$Id: mixer_ctl.c,v 1.1 1997/02/28 14:02:47 tommy Exp $";
#endif

#include <stdio.h>
#include <err.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/soundcard.h>

#include "play.h"

static int get_volume_channel(int fd)
{
    int channel;
    int tmp;
    
    if (ioctl(fd, SOUND_MIXER_READ_DEVMASK, &tmp) >= 0) {
	if (tmp & (1 << SOUND_MIXER_PCM))
	    channel = SOUND_MIXER_PCM;
	else
	    channel = SOUND_MIXER_VOLUME;
    }

    return channel;
}

int set_mixer(arg_params_t *params)
{
    register int fd, stat;
    int vol_chan;
    
    if (params->volume < 0 && params->bass < 0 && params->treble < 0)
	return FALSE;
    
    if ((fd = open(DEV_MIXER, O_RDONLY)) < 0) {
	warn(DEV_MIXER);
	return TRUE;
    }

    vol_chan = get_volume_channel(fd);

    if (params->bass >= 0) {
	int bass = params->bass | (params->bass << 8);
	stat = ioctl(fd, MIXER_WRITE(SOUND_MIXER_WRITE_BASS), &bass);
	if (stat < 0)
	    warn(DEV_MIXER);
    }

    if (params->treble >= 0) {
	int treble = params->treble | (params->treble << 8);
	stat = ioctl(fd, MIXER_WRITE(SOUND_MIXER_WRITE_TREBLE), &treble);
	if (stat < 0)
	    warn(DEV_MIXER);
    }

    if (params->volume >= 0) {
	int volume = params->volume | (params->volume << 8); /* no panning */
	stat = ioctl(fd, MIXER_WRITE(vol_chan), &volume);
	if (stat < 0)
	    warn(DEV_MIXER);
    }
    close(fd);

    return stat;
}