/*
  * Header file for hardcoded mpegaudiodec tables
  *
  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #ifndef AVCODEC_MPEGAUDIO_TABLEGEN_H
 #define AVCODEC_MPEGAUDIO_TABLEGEN_H

 
 #include <stdint.h>
 #include <math.h>
 
 #define TABLE_4_3_SIZE (8191 + 16)*4
 #if CONFIG_HARDCODED_TABLES
 #define mpegaudio_tableinit()

 #include "libavcodec/mpegaudio_tables.h"

 #else

 static int8_t   table_4_3_exp[TABLE_4_3_SIZE];

 static uint32_t table_4_3_value[TABLE_4_3_SIZE];

 static uint32_t exp_table_fixed[512];
 static uint32_t expval_table_fixed[512][16];

 static float exp_table_float[512];
 static float expval_table_float[512][16];

 #define FRAC_BITS 23

 #define IMDCT_SCALAR 1.759

 static void mpegaudio_tableinit(void)
 {

     int i, value, exponent;

     for (i = 1; i < TABLE_4_3_SIZE; i++) {
         double value = i / 4;

         double f, fm;
         int e, m;

         /* cbrtf() isn't available on all systems, so we use powf(). */

         f  = value / IMDCT_SCALAR * pow(value, 1.0 / 3.0) * pow(2, (i & 3) * 0.25);

         fm = frexp(f, &e);

         m  = (uint32_t)(fm * (1LL << 31) + 0.5);
         e += FRAC_BITS - 31 + 5 - 100;

 
         /* normalized to FRAC_BITS */

         table_4_3_value[i] =  m;
         table_4_3_exp[i]   = -e;

     }

     for (exponent = 0; exponent < 512; exponent++) {
         for (value = 0; value < 16; value++) {

             /* cbrtf() isn't available on all systems, so we use powf(). */

             double f = (double)value * pow(value, 1.0 / 3.0) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5) / IMDCT_SCALAR;

             /* llrint() isn't always available, so round and cast manually. */

             expval_table_fixed[exponent][value] = (long long int) (f < 0xFFFFFFFF ? floor(f + 0.5) : 0xFFFFFFFF);

             expval_table_float[exponent][value] = f;

         }

         exp_table_fixed[exponent] = expval_table_fixed[exponent][1];

         exp_table_float[exponent] = expval_table_float[exponent][1];

     }
 }

 #endif /* CONFIG_HARDCODED_TABLES */

 #endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */