libavcodec/sinewin_tablegen.h

   1 /*
   2  * Header file for hardcoded sine windows
   3  *
   4  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <assert.h>
  24 // do not use libavutil/libm.h since this is compiled both
  25 // for the host and the target and config.h is only valid for the target
  26 #include <math.h>
  27 #include "libavutil/attributes.h"
  28
  29 #if !CONFIG_HARDCODED_TABLES
  30 SINETABLE(  32);
  31 SINETABLE(  64);
  32 SINETABLE( 128);
  33 SINETABLE( 256);
  34 SINETABLE( 512);
  35 SINETABLE(1024);
  36 SINETABLE(2048);
  37 SINETABLE(4096);
  38 #else
  39 #include "libavcodec/sinewin_tables.h"
  40 #endif
  41
  42 SINETABLE_CONST float * const ff_sine_windows[] = {
  43     NULL, NULL, NULL, NULL, NULL, // unused
  44     ff_sine_32 , ff_sine_64 ,
  45     ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
  46 };
  47
  48 // Generate a sine window.
  49 av_cold void ff_sine_window_init(float *window, int n) {
  50     int i;
  51     for(i = 0; i < n; i++)
  52         window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
  53 }
  54
  55 av_cold void ff_init_ff_sine_windows(int index) {
  56     assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
  57 #if !CONFIG_HARDCODED_TABLES
  58     ff_sine_window_init(ff_sine_windows[index], 1 << index);
  59 #endif
  60 }