xref: /third_party/ffmpeg/libavcodec/libjxl.c (revision cabdff1a) 
1/*
2 * JPEG XL de/encoding via libjxl, common support implementation
3 * Copyright (c) 2021 Leo Izen <leo.izen@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * JPEG XL via libjxl common support implementation
25 */
26
27#include "libavutil/cpu.h"
28#include "libavutil/mem.h"
29
30#include <jxl/memory_manager.h>
31#include "libjxl.h"
32
33size_t ff_libjxl_get_threadcount(int threads)
34{
35    if (threads <= 0)
36        return av_cpu_count();
37    if (threads == 1)
38        return 0;
39    return threads;
40}
41
42/**
43 * Wrapper around av_malloc used as a jpegxl_alloc_func.
44 *
45 * @param  opaque opaque pointer for jpegxl_alloc_func, always ignored
46 * @param  size Size in bytes for the memory block to be allocated
47 * @return Pointer to the allocated block, or `NULL` if it cannot be allocated
48 */
49static void *libjxl_av_malloc(void *opaque, size_t size)
50{
51    return av_malloc(size);
52}
53
54/**
55 * Wrapper around av_free used as a jpegxl_free_func.
56 *
57 * @param opaque  opaque pointer for jpegxl_free_func, always ignored
58 * @param address Pointer to the allocated block, to free. `NULL` permitted as a no-op.
59 */
60static void libjxl_av_free(void *opaque, void *address)
61{
62    av_free(address);
63}
64
65void ff_libjxl_init_memory_manager(JxlMemoryManager *manager)
66{
67    manager->opaque = NULL;
68    manager->alloc = &libjxl_av_malloc;
69    manager->free = &libjxl_av_free;
70}
71