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https://github.com/alsa-project/alsa-lib.git
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78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
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/**
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* \file mixer/simple_abst.c
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* \brief Mixer Simple Element Class Interface - Module Abstraction
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* \author Jaroslav Kysela <perex@suse.cz>
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* \date 2005
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*
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* Mixer simple element class interface.
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*/
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/*
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* Mixer Interface - simple controls - abstraction module
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* Copyright (c) 2005 by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <math.h>
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#include "mixer_local.h"
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#include "mixer_simple.h"
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/**
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* \brief Register mixer simple element class - basic abstraction
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* \param mixer Mixer handle
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* \param options Options container
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* \param classp Pointer to returned mixer simple element class handle (or NULL
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* \return 0 on success otherwise a negative error code
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*/
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int snd_mixer_simple_basic_register(snd_mixer_t *mixer,
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struct snd_mixer_selem_regopt *options,
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snd_mixer_class_t **classp)
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{
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snd_mixer_class_t *class = calloc(1, sizeof(*class));
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const char *file;
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snd_input_t *input;
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int err;
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if (snd_mixer_class_malloc(&class))
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return -ENOMEM;
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//snd_mixer_class_set_event(class, simple_event);
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snd_mixer_class_set_compare(class, snd_mixer_selem_compare);
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file = getenv("ALSA_MIXER_SIMPLE");
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if (!file)
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file = DATADIR "/alsa/smixer.conf";
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if ((err = snd_input_stdio_open(&input, file, "r")) < 0) {
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SNDERR("unable to open simple mixer configuration file '%s'", file);
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goto __error;
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}
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err = snd_mixer_class_register(class, mixer);
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if (err < 0) {
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__error:
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if (class)
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snd_mixer_class_free(class);
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return err;
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}
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if (classp)
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*classp = class;
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return 0;
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}
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