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big simple mixer update

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- exported all necessary functions to create a mixer module outside alsa-lib
- separated simple mixer API from the simple mixer implementation
  (using callbacks as usuall)
  - src/mixer/simple.c is the core
  - src/mixer/simple_none.c is the current (no-abstraction) implementation
    based on control names; note that this module does not depend on
    internal ALSA structures now
  - src/mixer/simple_abst.c is the ongoing abstraction which will use
    external dynamic modules; src/conf/smixer.conf will describe which
    modules will be used depending on the components from the driver
This commit is contained in:
Jaroslav Kysela 2005-06-03 13:33:04 +00:00
parent ae07fd40fb
commit 597b4d0942
12 changed files with 2270 additions and 1486 deletions
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77
src/mixer/simple_abst.c Normal file
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/**
* \file mixer/simple_abst.c
* \brief Mixer Simple Element Class Interface - Module Abstraction
* \author Jaroslav Kysela <perex@suse.cz>
* \date 2005
*
* Mixer simple element class interface.
*/
/*
* Mixer Interface - simple controls - abstraction module
* Copyright (c) 2005 by Jaroslav Kysela <perex@suse.cz>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <math.h>
#include "mixer_local.h"
#include "mixer_simple.h"
/**
* \brief Register mixer simple element class - basic abstraction
* \param mixer Mixer handle
* \param options Options container
* \param classp Pointer to returned mixer simple element class handle (or NULL
* \return 0 on success otherwise a negative error code
*/
int snd_mixer_simple_basic_register(snd_mixer_t *mixer,
struct snd_mixer_selem_regopt *options,
snd_mixer_class_t **classp)
{
snd_mixer_class_t *class = calloc(1, sizeof(*class));
const char *file;
snd_input_t *input;
int err;
if (snd_mixer_class_malloc(&class))
return -ENOMEM;
//snd_mixer_class_set_event(class, simple_event);
snd_mixer_class_set_compare(class, snd_mixer_selem_compare);
file = getenv("ALSA_MIXER_SIMPLE");
if (!file)
file = DATADIR "/alsa/smixer.conf";
if ((err = snd_input_stdio_open(&input, file, "r")) < 0) {
SNDERR("unable to open simple mixer configuration file '%s'", file);
goto __error;
}
err = snd_mixer_class_register(class, mixer);
if (err < 0) {
__error:
if (class)
snd_mixer_class_free(class);
return err;
}
if (classp)
*classp = class;
return 0;
}