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  1. /*
  2.  * (I)RDFT transforms
  3.  * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVCODEC_RDFT_H
  23. #define AVCODEC_RDFT_H
  24.  
  25. #include "config.h"
  26. #include "fft.h"
  27.  
  28. #if CONFIG_HARDCODED_TABLES
  29. #   define SINTABLE_CONST const
  30. #else
  31. #   define SINTABLE_CONST
  32. #endif
  33.  
  34. #define SINTABLE(size) \
  35.     SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2]
  36.  
  37. extern SINTABLE(16);
  38. extern SINTABLE(32);
  39. extern SINTABLE(64);
  40. extern SINTABLE(128);
  41. extern SINTABLE(256);
  42. extern SINTABLE(512);
  43. extern SINTABLE(1024);
  44. extern SINTABLE(2048);
  45. extern SINTABLE(4096);
  46. extern SINTABLE(8192);
  47. extern SINTABLE(16384);
  48. extern SINTABLE(32768);
  49. extern SINTABLE(65536);
  50.  
  51. struct RDFTContext {
  52.     int nbits;
  53.     int inverse;
  54.     int sign_convention;
  55.  
  56.     /* pre/post rotation tables */
  57.     const FFTSample *tcos;
  58.     SINTABLE_CONST FFTSample *tsin;
  59.     FFTContext fft;
  60.     void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
  61. };
  62.  
  63. /**
  64.  * Set up a real FFT.
  65.  * @param nbits           log2 of the length of the input array
  66.  * @param trans           the type of transform
  67.  */
  68. int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
  69. void ff_rdft_end(RDFTContext *s);
  70.  
  71. void ff_rdft_init_arm(RDFTContext *s);
  72.  
  73.  
  74. #endif /* AVCODEC_RDFT_H */
  75.