ffmpeg/libavcodec/dct.h

   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 #if !defined(AVCODEC_DCT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT)
  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 void ff_jref_idct_put(uint8_t *dest, int line_size, int16_t *block);
  66 void ff_jref_idct_add(uint8_t *dest, int line_size, int16_t *block);
  67
  68 #endif /* AVCODEC_DCT_H */