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  1. /*
  2.  * Header file for hardcoded AAC cube-root table
  3.  *
  4.  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  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.
  12.  *
  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.
  17.  *
  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
  21.  */
  22.  
  23. #ifndef AVCODEC_CBRT_TABLEGEN_H
  24. #define AVCODEC_CBRT_TABLEGEN_H
  25.  
  26. #include <stdint.h>
  27. #include <math.h>
  28.  
  29. #if CONFIG_HARDCODED_TABLES
  30. #define cbrt_tableinit()
  31. #include "libavcodec/cbrt_tables.h"
  32. #else
  33. static uint32_t cbrt_tab[1 << 13];
  34.  
  35. static void cbrt_tableinit(void)
  36. {
  37.     if (!cbrt_tab[(1<<13) - 1]) {
  38.         int i;
  39.         /* cbrtf() isn't available on all systems, so we use powf(). */
  40.         for (i = 0; i < 1<<13; i++) {
  41.             union {
  42.                 float f;
  43.                 uint32_t i;
  44.             } f;
  45.             f.f = pow(i, 1.0 / 3.0) * i;
  46.             cbrt_tab[i] = f.i;
  47.         }
  48.     }
  49. }
  50. #endif /* CONFIG_HARDCODED_TABLES */
  51.  
  52. #endif /* AVCODEC_CBRT_TABLEGEN_H */
  53.