Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / cbrt_tablegen.h
CommitLineData
2ba45a60
DM
1/*
2 * Header file for hardcoded AAC cube-root table
3 *
4 * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#ifndef AVCODEC_CBRT_TABLEGEN_H
24#define AVCODEC_CBRT_TABLEGEN_H
25
26#include <stdint.h>
27#include <math.h>
28#include "libavutil/attributes.h"
29
30#if CONFIG_HARDCODED_TABLES
31#define cbrt_tableinit()
32#include "libavcodec/cbrt_tables.h"
33#else
34static uint32_t cbrt_tab[1 << 13];
35
36static av_cold void cbrt_tableinit(void)
37{
38 if (!cbrt_tab[(1<<13) - 1]) {
39 int i;
40 /* cbrtf() isn't available on all systems, so we use powf(). */
41 for (i = 0; i < 1<<13; i++) {
42 union {
43 float f;
44 uint32_t i;
45 } f;
46 f.f = pow(i, 1.0 / 3.0) * i;
47 cbrt_tab[i] = f.i;
48 }
49 }
50}
51#endif /* CONFIG_HARDCODED_TABLES */
52
53#endif /* AVCODEC_CBRT_TABLEGEN_H */