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* (I)DCT Transforms
* Copyright (c) 2009 Peter Ross <>
* Copyright (c) 2010 Alex Converse <>
* Copyright (c) 2010 Vitor Sessak
* This file is part of FFmpeg.
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#if !defined(AVCODEC_DCT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT)
#include <stddef.h>
#include <stdint.h>
#include "rdft.h"
struct DCTContext {
int nbits;
int inverse;
RDFTContext rdft;
const float *costab;
FFTSample *csc2;
void (*dct_calc)(struct DCTContext *s, FFTSample *data);
void (*dct32)(FFTSample *out, const FFTSample *in);
* Set up DCT.
* @param nbits size of the input array:
* (1 << nbits) for DCT-II, DCT-III and DST-I
* (1 << nbits) + 1 for DCT-I
* @note the first element of the input of DST-I is ignored
int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);
void ff_dct_end (DCTContext *s);
void ff_dct_init_x86(DCTContext *s);
void ff_fdct_ifast(int16_t *data);
void ff_fdct_ifast248(int16_t *data);
void ff_jpeg_fdct_islow_8(int16_t *data);
void ff_jpeg_fdct_islow_10(int16_t *data);
void ff_fdct248_islow_8(int16_t *data);
void ff_fdct248_islow_10(int16_t *data);
void ff_j_rev_dct(int16_t *data);
void ff_j_rev_dct4(int16_t *data);
void ff_j_rev_dct2(int16_t *data);
void ff_j_rev_dct1(int16_t *data);
void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block);
void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block);
#endif /* AVCODEC_DCT_H */