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  1. /*
  2.  * (I)DCT Transforms
  3.  * Copyright (c) 2009 Peter Ross <pross@xvid.org>
  4.  * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
  5.  * Copyright (c) 2010 Vitor Sessak
  6.  *
  7.  * This file is part of FFmpeg.
  8.  *
  9.  * FFmpeg is free software; you can redistribute it and/or
  10.  * modify it under the terms of the GNU Lesser General Public
  11.  * License as published by the Free Software Foundation; either
  12.  * version 2.1 of the License, or (at your option) any later version.
  13.  *
  14.  * FFmpeg is distributed in the hope that it will be useful,
  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17.  * Lesser General Public License for more details.
  18.  *
  19.  * You should have received a copy of the GNU Lesser General Public
  20.  * License along with FFmpeg; if not, write to the Free Software
  21.  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  22.  */
  23.  
  24. #ifndef AVCODEC_DCT_H
  25. #define AVCODEC_DCT_H
  26.  
  27. #include <stdint.h>
  28.  
  29. #include "rdft.h"
  30.  
  31. struct DCTContext {
  32.     int nbits;
  33.     int inverse;
  34.     RDFTContext rdft;
  35.     const float *costab;
  36.     FFTSample *csc2;
  37.     void (*dct_calc)(struct DCTContext *s, FFTSample *data);
  38.     void (*dct32)(FFTSample *out, const FFTSample *in);
  39. };
  40.  
  41. /**
  42.  * Set up DCT.
  43.  * @param nbits           size of the input array:
  44.  *                        (1 << nbits)     for DCT-II, DCT-III and DST-I
  45.  *                        (1 << nbits) + 1 for DCT-I
  46.  *
  47.  * @note the first element of the input of DST-I is ignored
  48.  */
  49. int  ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);
  50. void ff_dct_end (DCTContext *s);
  51.  
  52. void ff_dct_init_x86(DCTContext *s);
  53.  
  54. void ff_fdct_ifast(int16_t *data);
  55. void ff_fdct_ifast248(int16_t *data);
  56. void ff_jpeg_fdct_islow_8(int16_t *data);
  57. void ff_jpeg_fdct_islow_10(int16_t *data);
  58. void ff_fdct248_islow_8(int16_t *data);
  59. void ff_fdct248_islow_10(int16_t *data);
  60.  
  61. void ff_j_rev_dct(int16_t *data);
  62. void ff_j_rev_dct4(int16_t *data);
  63. void ff_j_rev_dct2(int16_t *data);
  64. void ff_j_rev_dct1(int16_t *data);
  65.  
  66. void ff_fdct_mmx(int16_t *block);
  67. void ff_fdct_mmxext(int16_t *block);
  68. void ff_fdct_sse2(int16_t *block);
  69.  
  70. #endif /* AVCODEC_DCT_H */
  71.