mpegaudio_tablegen: Don't use llrint
[libav.git] / libavcodec / mpegaudio_tablegen.h
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1/*
2 * Header file for hardcoded mpegaudiodec tables
3 *
4 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
5 *
2912e87a 6 * This file is part of Libav.
eadaa00c 7 *
2912e87a 8 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 13 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 19 * License along with Libav; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
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23#ifndef AVCODEC_MPEGAUDIO_TABLEGEN_H
24#define AVCODEC_MPEGAUDIO_TABLEGEN_H
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25
26#include <stdint.h>
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27#include <math.h>
28
29#define TABLE_4_3_SIZE (8191 + 16)*4
30#if CONFIG_HARDCODED_TABLES
31#define mpegaudio_tableinit()
52a4a077 32#include "libavcodec/mpegaudio_tables.h"
eadaa00c 33#else
e137934f 34static int8_t table_4_3_exp[TABLE_4_3_SIZE];
eadaa00c 35static uint32_t table_4_3_value[TABLE_4_3_SIZE];
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36static uint32_t exp_table_fixed[512];
37static uint32_t expval_table_fixed[512][16];
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38static float exp_table_float[512];
39static float expval_table_float[512][16];
eadaa00c 40
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41#define FRAC_BITS 23
42
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43static void mpegaudio_tableinit(void)
44{
f3001e0d 45 int i, value, exponent;
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46 for (i = 1; i < TABLE_4_3_SIZE; i++) {
47 double value = i / 4;
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48 double f, fm;
49 int e, m;
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50 /* cbrtf() isn't available on all systems, so we use powf(). */
51 f = value * powf(value, 1.0 / 3.0) * pow(2, (i & 3) * 0.25);
eadaa00c 52 fm = frexp(f, &e);
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53 m = (uint32_t)(fm * (1LL << 31) + 0.5);
54 e += FRAC_BITS - 31 + 5 - 100;
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55
56 /* normalized to FRAC_BITS */
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57 table_4_3_value[i] = m;
58 table_4_3_exp[i] = -e;
eadaa00c 59 }
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60 for (exponent = 0; exponent < 512; exponent++) {
61 for (value = 0; value < 16; value++) {
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62 /* cbrtf() isn't available on all systems, so we use powf(). */
63 double f = (double)value * powf(value, 1.0 / 3.0) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5);
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64 /* llrint() isn't always available, so round and cast manually. */
65 expval_table_fixed[exponent][value] = (long long int) (f >= 0 ? floor(f + 0.5) : ceil(f - 0.5));
b91d4661 66 expval_table_float[exponent][value] = f;
f3001e0d 67 }
4bac1bbc 68 exp_table_fixed[exponent] = expval_table_fixed[exponent][1];
b91d4661 69 exp_table_float[exponent] = expval_table_float[exponent][1];
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70 }
71}
8abe97be 72#endif /* CONFIG_HARDCODED_TABLES */
eadaa00c 73
153382e1 74#endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */