libavcodec/sinewin.h

   1 /*
   2  * Copyright (c) 2008 Robert Swain
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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 */