/* * Copyright © 2018, VideoLAN and dav1d authors * Copyright © 2018, Two Orioles, LLC * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this *    list of conditions and the following disclaimer. * * 2. 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. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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. */ #include "config.h" #include "src/ref.h" static void default_free_callback(const uint8_t *const data, void *const user_data) {    assert(data == user_data);    dav1d_free_aligned(user_data);} Dav1dRef *dav1d_ref_create(size_t size) {    size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);     uint8_t *const data = dav1d_alloc_aligned(size + sizeof(Dav1dRef), 64);    if (!data) return NULL;     Dav1dRef *const res = (Dav1dRef*)(data + size);    res->const_data = res->user_data = res->data = data;    atomic_init(&res->ref_cnt, 1);    res->free_ref = 0;    res->free_callback = default_free_callback;     return res;} static void pool_free_callback(const uint8_t *const data, void *const user_data) {    dav1d_mem_pool_push((Dav1dMemPool*)data, user_data);} Dav1dRef *dav1d_ref_create_using_pool(Dav1dMemPool *const pool, size_t size) {    size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);     Dav1dMemPoolBuffer *const buf =        dav1d_mem_pool_pop(pool, size + sizeof(Dav1dRef));    if (!buf) return NULL;     Dav1dRef *const res = &((Dav1dRef*)buf)[-1];    res->data = buf->data;    res->const_data = pool;    atomic_init(&res->ref_cnt, 1);    res->free_ref = 0;    res->free_callback = pool_free_callback;    res->user_data = buf;     return res;} Dav1dRef *dav1d_ref_wrap(const uint8_t *const ptr,                         void (*free_callback)(const uint8_t *data, void *user_data),                         void *const user_data){    Dav1dRef *res = malloc(sizeof(Dav1dRef));    if (!res) return NULL;     res->data = NULL;    res->const_data = ptr;    atomic_init(&res->ref_cnt, 1);    res->free_ref = 1;    res->free_callback = free_callback;    res->user_data = user_data;     return res;} void dav1d_ref_inc(Dav1dRef *const ref) {    atomic_fetch_add(&ref->ref_cnt, 1);} void dav1d_ref_dec(Dav1dRef **const pref) {    assert(pref != NULL);     Dav1dRef *const ref = *pref;    if (!ref) return;     if (atomic_fetch_sub(&ref->ref_cnt, 1) == 1) {        const int free_ref = ref->free_ref;        ref->free_callback(ref->const_data, ref->user_data);        if (free_ref) free(ref);    }    *pref = NULL;} int dav1d_ref_is_writable(Dav1dRef *const ref) {    return atomic_load(&ref->ref_cnt) == 1 && ref->data;}