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/*
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* Header file for hardcoded mpegaudiodec tables
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*
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef MPEGAUDIO_TABLEGEN_H
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#define MPEGAUDIO_TABLEGEN_H
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#include <stdint.h>
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// do not use libavutil/mathematics.h since this is compiled both
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// for the host and the target and config.h is only valid for the target
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#include <math.h>
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#define TABLE_4_3_SIZE (8191 + 16)*4
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#if CONFIG_HARDCODED_TABLES
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#define mpegaudio_tableinit()
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#include "mpegaudio_tables.h"
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#else
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static int8_t table_4_3_exp[TABLE_4_3_SIZE];
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static uint32_t table_4_3_value[TABLE_4_3_SIZE];
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static uint32_t exp_table[512];
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static uint32_t expval_table[512][16];
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static void mpegaudio_tableinit(void)
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{
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int i;
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for(i=1;i<TABLE_4_3_SIZE;i++) {
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double value = i/4;
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double f, fm;
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int e, m;
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f = value * cbrtf(value) * pow(2, (i&3)*0.25);
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fm = frexp(f, &e);
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m = (uint32_t)(fm*(1LL<<31) + 0.5);
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e+= FRAC_BITS - 31 + 5 - 100;
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/* normalized to FRAC_BITS */
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table_4_3_value[i] = m;
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table_4_3_exp[i] = -e;
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}
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for(i=0; i<512*16; i++){
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double value = i & 15;
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int exponent= (i>>4);
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double f= value * cbrtf(value) * pow(2, (exponent-400)*0.25 + FRAC_BITS + 5);
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expval_table[exponent][i&15]= llrint(f);
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if((i&15)==1)
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exp_table[exponent]= llrint(f);
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}
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}
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#endif /* CONFIG_HARDCODED_TABLES */
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#endif /* MPEGAUDIO_TABLEGEN_H */
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