61 lines
2.8 KiB
C
61 lines
2.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2016 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __ALSA_CONTROLS_RB_H__
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#define __ALSA_CONTROLS_RB_H__
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#include <config.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <alsa/asoundlib.h>
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#include <alloca.h>
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/* open alsa control interface and list all controls, keep control open */
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void alsa_controls_init(void);
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/* close alsa controls */
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void alsa_controls_close(void);
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/* NOTE: all the following functions panic on error. This behaviour could be changed with the
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* functions returning proper values but that would make errors happen silently */
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/* find a control element ID by name, return false of not found, the id needs
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* to be allocated */
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bool alsa_controls_find(snd_ctl_elem_id_t *id, const char *name);
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/* check wether a control exists */
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bool alsa_has_control(const char *name);
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/* find a control element enum index by name, return -1 if not found */
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int alsa_controls_find_enum(const char *name, const char *enum_name);
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/* set a control, potentially supports several values */
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void alsa_controls_set(const char *name, snd_ctl_elem_type_t type,
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unsigned nr_values, long *val);
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/* get control information: number of values */
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void alsa_controls_get_info(const char *name, int *out_count);
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/* helper function: set a control with a single boolean value */
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void alsa_controls_set_bool(const char *name, bool val);
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/* helper function: set a control with a single enum value */
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void alsa_controls_set_enum(const char *name, const char *enum_name);
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/* helper function: set a control with one or more integers */
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void alsa_controls_set_ints(const char *name, int count, long *val);
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/* get a control value, potentially supports several values */
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void alsa_controls_get(const char *name, snd_ctl_elem_type_t type,
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unsigned nr_values, long *val);
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/* helper function: set a control with a single boolean value */
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bool alsa_controls_get_bool(const char *name);
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#endif /* __ALSA_CONTROLS_RB_H__ */
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