*
* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef MPEGAUDIO_TABLEGEN_H
-#define MPEGAUDIO_TABLEGEN_H
+#ifndef AVCODEC_MPEGAUDIO_TABLEGEN_H
+#define AVCODEC_MPEGAUDIO_TABLEGEN_H
#include <stdint.h>
-// do not use libavutil/mathematics.h since this is compiled both
-// for the host and the target and config.h is only valid for the target
#include <math.h>
#define TABLE_4_3_SIZE (8191 + 16)*4
#define mpegaudio_tableinit()
#include "libavcodec/mpegaudio_tables.h"
#else
-static int8_t table_4_3_exp[TABLE_4_3_SIZE];
+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[512];
-static uint32_t expval_table[512][16];
+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
static void mpegaudio_tableinit(void)
{
- int i;
- for(i=1;i<TABLE_4_3_SIZE;i++) {
- double value = i/4;
+ int i, value, exponent;
+ for (i = 1; i < TABLE_4_3_SIZE; i++) {
+ double value = i / 4;
double f, fm;
int e, m;
- f = value * cbrtf(value) * pow(2, (i&3)*0.25);
+ f = value * cbrtf(value) * pow(2, (i & 3) * 0.25);
fm = frexp(f, &e);
- m = (uint32_t)(fm*(1LL<<31) + 0.5);
- e+= FRAC_BITS - 31 + 5 - 100;
+ 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;
+ table_4_3_value[i] = m;
+ table_4_3_exp[i] = -e;
}
- for(i=0; i<512*16; i++){
- double value = i & 15;
- int exponent= (i>>4);
- double f= value * cbrtf(value) * pow(2, (exponent-400)*0.25 + FRAC_BITS + 5);
- expval_table[exponent][i&15]= llrint(f);
- if((i&15)==1)
- exp_table[exponent]= llrint(f);
+ for (exponent = 0; exponent < 512; exponent++) {
+ for (value = 0; value < 16; value++) {
+ double f = (double)value * cbrtf(value) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5);
+ expval_table_fixed[exponent][value] = llrint(f);
+ 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 /* MPEGAUDIO_TABLEGEN_H */
+#endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */