Allow hard-coding of the 32kB cubic-root table for AAC.
[libav.git] / libavcodec / cbrt_tablegen.h
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 CBRT_TABLEGEN_H
24 #define CBRT_TABLEGEN_H
25
26 #include <stdint.h>
27 #include <math.h>
28
29 #if CONFIG_HARDCODED_TABLES
30 #define cbrt_tableinit()
31 #include "libavcodec/cbrt_tables.h"
32 #else
33 static uint32_t cbrt_tab[1 << 13];
34
35 static void cbrt_tableinit(void)
36 {
37 if (!cbrt_tab[(1<<13) - 1]) {
38 int i;
39 for (i = 0; i < 1<<13; i++) {
40 union {
41 float f;
42 uint32_t i;
43 } f;
44 f.f = cbrtf(i) * i;
45 cbrt_tab[i] = f.i;
46 }
47 }
48 }
49 #endif /* CONFIG_HARDCODED_TABLES */
50
51 #endif /* CBRT_TABLEGEN_H */