source: mainline/uspace/srv/audio/hound/audio_data.c@ 76ea1b7

/*
 * Copyright (c) 2013 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup audio
 * @brief HelenOS sound server
 * @{
 */
/** @file
 */

#include <malloc.h>
#include "audio_data.h"

static void ref_inc(audio_data_t *adata)
{
        assert(adata);
        assert(atomic_get(&adata->refcount) > 0);
        atomic_inc(&adata->refcount);
}

static void ref_dec(audio_data_t *adata)
{
        assert(adata);
        assert(atomic_get(&adata->refcount) > 0);
        atomic_count_t refc = atomic_predec(&adata->refcount);
        if (refc == 0) {
                free(adata->data);
                free(adata);
        }
}

audio_data_link_t *audio_data_link_clone(audio_data_t *adata)
{
        assert(adata);
        audio_data_link_t *link = malloc(sizeof(audio_data_link_t));
        if (link) {
                ref_inc(adata);
                link->adata = adata;
                link->position = 0;
        }
        return link;
}

audio_data_link_t * audio_data_link_create(const void *data, size_t size)
{
        audio_data_link_t *link = NULL;
        audio_data_t *adata = malloc(sizeof(audio_data_t));
        if (adata) {
                adata->data = data;
                adata->size = size;
                atomic_set(&adata->refcount, 1);
                link = audio_data_link_clone(adata);
                /* This will either return refcount to 1 or clean adata if
                 * cloning failed */
                ref_dec(adata);
        }
        return link;
}

void audio_data_link_destroy(audio_data_link_t *link)
{
        assert(link);
        assert(!link_in_use(&link->link));
        ref_dec(link->adata);
        free(link);
}

/**
 * @}
 */