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/*
sndctrl.c - A simple user-space program to access an ALSA mixer
device.
Copyright (c) 2005 Andrew Calkin <calkina@geexbox.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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <alsa/asoundlib.h>
int getvolume(long *vol)
{
snd_mixer_t *mixer; /* handle pointer for the mixer */
snd_mixer_selem_id_t *sid; /* stores simple id of control */
snd_mixer_elem_t *elem; /* used for master element */
snd_mixer_open(&mixer, 0); /*open up the mixer for card 0 */
snd_mixer_attach(mixer, "default" );
snd_mixer_selem_register(mixer, 0, 0 );
snd_mixer_load(mixer);
snd_mixer_selem_id_alloca(&sid); /*gets address of control */
snd_mixer_selem_id_set_name(sid, "Master");
elem = snd_mixer_find_selem(mixer, sid);
/* Only need one channel (left)- assume both the same */
snd_mixer_selem_get_playback_volume (elem, 0, vol);
snd_mixer_close(mixer);
return(0);
}
int setvolume(long newvol)
{
snd_mixer_t *mixer; /* handle pointer for the mixer */
snd_mixer_selem_id_t *sid; /* stores simple id of control */
snd_mixer_elem_t *elem; /* used for master element */
snd_mixer_open(&mixer, 0); /* open up the mixer for card 0 */
snd_mixer_attach(mixer, "default" );
snd_mixer_selem_register(mixer, 0, 0 );
snd_mixer_load(mixer);
snd_mixer_selem_id_alloca(&sid); /* gets address of control */
snd_mixer_selem_id_set_name(sid, "Master");
elem = snd_mixer_find_selem(mixer, sid);
/* left and then right channels */
snd_mixer_selem_set_playback_volume (elem, 0, newvol);
snd_mixer_selem_set_playback_volume (elem, 1, newvol);
snd_mixer_close(mixer);
return(0);
}
int getvolrange(long *vmin, long *vmax)
{
snd_mixer_t *mixer; /* handle pointer for the mixer */
snd_mixer_selem_id_t *sid; /* stores simple id of control */
snd_mixer_elem_t *elem; /* used for master element */
snd_mixer_open(&mixer, 0); /* open up the mixer for card 0 */
snd_mixer_attach(mixer, "default" );
snd_mixer_selem_register(mixer, 0, 0 );
snd_mixer_load(mixer);
snd_mixer_selem_id_alloca(&sid); /* gets address of control */
snd_mixer_selem_id_set_name(sid, "Master");
elem = snd_mixer_find_selem(mixer, sid);
snd_mixer_selem_get_playback_volume_range (elem, vmin, vmax);
snd_mixer_close(mixer);
return(0);
}
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