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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2016 Amaury Pouly
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef __ALSA_CONTROLS_RB_H__
#define __ALSA_CONTROLS_RB_H__
#include <config.h>
#include <stddef.h>
#include <stdbool.h>
#include <alsa/asoundlib.h>
#include <alloca.h>
/* open alsa control interface and list all controls, keep control open */
void alsa_controls_init(const char *name);
/* close alsa controls */
void alsa_controls_close(void);
/* NOTE: all the following functions panic on error. This behaviour could be changed with the
* functions returning proper values but that would make errors happen silently */
/* check wether a control exists */
bool alsa_has_control(const char *name);
/* find a control element ID by name, return -1 of not found or index into array */
int alsa_controls_find(const char *name);
/* find a control element enum index by name, return -1 if not found */
int alsa_controls_find_enum(const char *name, const char *enum_name);
/* set a control, potentially supports several values */
void alsa_controls_set(const char *name, snd_ctl_elem_type_t type,
unsigned nr_values, long *val);
/* get control information: number of values */
void alsa_controls_get_info(const char *name, int *out_count);
/* helper function: set a control with a single boolean value */
void alsa_controls_set_bool(const char *name, bool val);
/* helper function: set a control with a single enum value */
void alsa_controls_set_enum(const char *name, const char *enum_name);
/* helper function: set a control with one or more integers */
void alsa_controls_set_ints(const char *name, int count, long *val);
/* get a control value, potentially supports several values */
void alsa_controls_get(const char *name, snd_ctl_elem_type_t type,
unsigned nr_values, long *val);
/* helper function: set a control with a single boolean value */
bool alsa_controls_get_bool(const char *name);
#endif /* __ALSA_CONTROLS_RB_H__ */
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