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sound_parameters.c
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sound_parameters.c
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/*
* simple Linux sound library
* Copyright (C) 2017, 2018 Ricardo Biehl Pasquali
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 08/06/2018
*
* get hardware parameters
*/
#include <sys/ioctl.h> /* ioctl() */
/* ALSA header */
#include <sound/asound.h>
#include "sound_parameters.h" /* struct snd_parameters */
#include "hardware_parameters.h" /* hw_param_*() */
int
snd_params_test(struct snd_parameters *p, unsigned int parameter,
unsigned int value)
{
return hw_param_get_mask(&p->hw_params, parameter, value);
}
/* get minimum and maximum value of a given parameter */
void
snd_params_get_interval(struct snd_parameters *p, unsigned int parameter,
unsigned int *min, unsigned int *max)
{
hw_param_get_interval(&p->hw_params, parameter, min, max);
}
int
snd_params_init(int fd, struct snd_parameters *p)
{
hw_param_fill(&p->hw_params);
if (ioctl(fd, SNDRV_PCM_IOCTL_HW_REFINE, &p->hw_params) == -1)
return -1;
return 0;
}