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  1. /*
  2.  * Copyright (c) 2008 Robert Swain
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVCODEC_SINEWIN_H
  22. #define AVCODEC_SINEWIN_H
  23.  
  24. #include "config.h"
  25. #include "libavutil/mem.h"
  26.  
  27. #if CONFIG_HARDCODED_TABLES
  28. #   define SINETABLE_CONST const
  29. #else
  30. #   define SINETABLE_CONST
  31. #endif
  32.  
  33. #define SINETABLE(size) \
  34.     SINETABLE_CONST DECLARE_ALIGNED(32, float, ff_sine_##size)[size]
  35.  
  36. /**
  37.  * Generate a sine window.
  38.  * @param   window  pointer to half window
  39.  * @param   n       size of half window
  40.  */
  41. void ff_sine_window_init(float *window, int n);
  42.  
  43. /**
  44.  * initialize the specified entry of ff_sine_windows
  45.  */
  46. void ff_init_ff_sine_windows(int index);
  47.  
  48. extern SINETABLE(  32);
  49. extern SINETABLE(  64);
  50. extern SINETABLE( 128);
  51. extern SINETABLE( 256);
  52. extern SINETABLE( 512);
  53. extern SINETABLE(1024);
  54. extern SINETABLE(2048);
  55. extern SINETABLE(4096);
  56. extern SINETABLE(8192);
  57.  
  58. extern SINETABLE_CONST float * const ff_sine_windows[14];
  59.  
  60. #endif /* AVCODEC_SINEWIN_H */
  61.