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Completed control and mixer API

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This commit is contained in:
Abramo Bagnara 2001-02-09 11:20:31 +00:00
parent c709b0a627
commit fea0c73cdb
23 changed files with 1988 additions and 1251 deletions
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80
src/mixer/bag.c Normal file
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/*
* Control Interface - highlevel API - helem bag operations
* Copyright (c) 2000 by Jaroslav Kysela <perex@suse.cz>
* Copyright (c) 2001 by Abramo Bagnara <abramo@alsa-project.org>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#define __USE_GNU
#include <search.h>
#include "mixer_local.h"
int snd_hctl_compare_fast(const snd_hctl_elem_t *c1,
const snd_hctl_elem_t *c2);
static void _free(void *ptr ATTRIBUTE_UNUSED) { };
int snd_hctl_bag_destroy(snd_hctl_bag_t *bag)
{
assert(bag != NULL);
tdestroy(bag->root, _free);
bag->root = NULL;
return 0;
}
int snd_hctl_bag_add(snd_hctl_bag_t *bag, snd_hctl_elem_t *helem)
{
void *res;
assert(bag != NULL && helem != NULL);
res = tsearch(helem, &bag->root, (__compar_fn_t)snd_hctl_compare_fast);
if (res == NULL)
return -ENOMEM;
if ((snd_hctl_elem_t *)res == helem)
return -EALREADY;
return 0;
}
int snd_hctl_bag_del(snd_hctl_bag_t *bag, snd_hctl_elem_t *helem)
{
assert(bag != NULL && helem != NULL);
if (tdelete(helem, &bag->root, (__compar_fn_t)snd_hctl_compare_fast) == NULL)
return -ENOENT;
return 0;
}
snd_hctl_elem_t *snd_hctl_bag_find(snd_hctl_bag_t *bag, snd_ctl_elem_id_t *id)
{
void *res;
assert(bag != NULL && id != NULL);
if (bag->root == NULL)
return NULL;
res = tfind(id, &bag->root, (__compar_fn_t)snd_hctl_compare_fast);
return res == NULL ? NULL : *(snd_hctl_elem_t **)res;
}
int snd_hctl_bag_empty(snd_hctl_bag_t *bag)
{
assert(bag != NULL);
return bag->root == NULL;
}