2 * Header file for hardcoded AAC cube-root table
4 * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
6 * This file is part of FFmpeg.
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.
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.
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
23 #ifndef AVCODEC_CBRT_TABLEGEN_H
24 #define AVCODEC_CBRT_TABLEGEN_H
28 #include "libavutil/attributes.h"
31 #define CBRT_RENAME(a) a ## _fixed
32 #define CBRT(x) (int)floor((x).f * 8192 + 0.5)
34 #define CBRT_RENAME(a) a
38 #if CONFIG_HARDCODED_TABLES
40 #define cbrt_tableinit_fixed()
41 #include "libavcodec/cbrt_fixed_tables.h"
43 #define cbrt_tableinit()
44 #include "libavcodec/cbrt_tables.h"
47 static uint32_t cbrt_tab[1 << 13];
49 static av_cold void CBRT_RENAME(cbrt_tableinit)(void)
51 if (!cbrt_tab[(1<<13) - 1]) {
53 /* cbrtf() isn't available on all systems, so we use powf(). */
54 for (i = 0; i < 1<<13; i++) {
59 f.f = pow(i, 1.0 / 3.0) * i;
60 cbrt_tab[i] = CBRT(f);
64 #endif /* CONFIG_HARDCODED_TABLES */
66 #endif /* AVCODEC_CBRT_TABLEGEN_H */