ffmpeg/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 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_SINEWIN_TABLEGEN_H
  24 #define AVCODEC_SINEWIN_TABLEGEN_H
  25
  26 #include <assert.h>
  27 // do not use libavutil/libm.h since this is compiled both
  28 // for the host and the target and config.h is only valid for the target
  29 #include <math.h>
  30 #include "libavutil/attributes.h"
  31 #include "libavutil/common.h"
  32
  33 #if !CONFIG_HARDCODED_TABLES
  34 SINETABLE(  32);
  35 SINETABLE(  64);
  36 SINETABLE( 128);
  37 SINETABLE( 256);
  38 SINETABLE( 512);
  39 SINETABLE(1024);
  40 SINETABLE(2048);
  41 SINETABLE(4096);
  42 SINETABLE(8192);
  43 #else
  44 #include "libavcodec/sinewin_tables.h"
  45 #endif
  46
  47 SINETABLE_CONST float * const ff_sine_windows[] = {
  48     NULL, NULL, NULL, NULL, NULL, // unused
  49     ff_sine_32 , ff_sine_64 ,
  50     ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096, ff_sine_8192
  51 };
  52
  53 // Generate a sine window.
  54 av_cold void ff_sine_window_init(float *window, int n) {
  55     int i;
  56     for(i = 0; i < n; i++)
  57         window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
  58 }
  59
  60 av_cold void ff_init_ff_sine_windows(int index) {
  61     assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
  62 #if !CONFIG_HARDCODED_TABLES
  63     ff_sine_window_init(ff_sine_windows[index], 1 << index);
  64 #endif
  65 }
  66
  67 #endif /* AVCODEC_SINEWIN_TABLEGEN_H */