FFmpeg
libjxl.c
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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 
33 size_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  */
49 static 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  */
60 static void libjxl_av_free(void *opaque, void *address)
61 {
62  av_free(address);
63 }
64 
65 void 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 }
ff_libjxl_get_threadcount
size_t ff_libjxl_get_threadcount(int threads)
Transform threadcount in ffmpeg to one used by libjxl.
Definition: libjxl.c:33
libjxl.h
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
NULL
#define NULL
Definition: coverity.c:32
libjxl_av_free
static void libjxl_av_free(void *opaque, void *address)
Wrapper around av_free used as a jpegxl_free_func.
Definition: libjxl.c:60
av_cpu_count
int av_cpu_count(void)
Definition: cpu.c:211
cpu.h
size
int size
Definition: twinvq_data.h:10344
libjxl_av_malloc
static void * libjxl_av_malloc(void *opaque, size_t size)
Wrapper around av_malloc used as a jpegxl_alloc_func.
Definition: libjxl.c:49
mem.h
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
ff_libjxl_init_memory_manager
void ff_libjxl_init_memory_manager(JxlMemoryManager *manager)
Initialize and populate a JxlMemoryManager with av_malloc() and av_free() so libjxl will use these fu...
Definition: libjxl.c:65