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  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 */
  68.