yading@10: /*
yading@10:  * (I)DCT Transforms
yading@10:  * Copyright (c) 2009 Peter Ross <pross@xvid.org>
yading@10:  * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
yading@10:  * Copyright (c) 2010 Vitor Sessak
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_DCT_H
yading@10: #define AVCODEC_DCT_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: 
yading@10: #include "rdft.h"
yading@10: 
yading@10: struct DCTContext {
yading@10:     int nbits;
yading@10:     int inverse;
yading@10:     RDFTContext rdft;
yading@10:     const float *costab;
yading@10:     FFTSample *csc2;
yading@10:     void (*dct_calc)(struct DCTContext *s, FFTSample *data);
yading@10:     void (*dct32)(FFTSample *out, const FFTSample *in);
yading@10: };
yading@10: 
yading@10: /**
yading@10:  * Set up DCT.
yading@10:  * @param nbits           size of the input array:
yading@10:  *                        (1 << nbits)     for DCT-II, DCT-III and DST-I
yading@10:  *                        (1 << nbits) + 1 for DCT-I
yading@10:  *
yading@10:  * @note the first element of the input of DST-I is ignored
yading@10:  */
yading@10: int  ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);
yading@10: void ff_dct_end (DCTContext *s);
yading@10: 
yading@10: void ff_dct_init_x86(DCTContext *s);
yading@10: 
yading@10: void ff_fdct_ifast(int16_t *data);
yading@10: void ff_fdct_ifast248(int16_t *data);
yading@10: void ff_jpeg_fdct_islow_8(int16_t *data);
yading@10: void ff_jpeg_fdct_islow_10(int16_t *data);
yading@10: void ff_fdct248_islow_8(int16_t *data);
yading@10: void ff_fdct248_islow_10(int16_t *data);
yading@10: 
yading@10: void ff_j_rev_dct(int16_t *data);
yading@10: void ff_j_rev_dct4(int16_t *data);
yading@10: void ff_j_rev_dct2(int16_t *data);
yading@10: void ff_j_rev_dct1(int16_t *data);
yading@10: 
yading@10: void ff_fdct_mmx(int16_t *block);
yading@10: void ff_fdct_mmxext(int16_t *block);
yading@10: void ff_fdct_sse2(int16_t *block);
yading@10: 
yading@10: #endif /* AVCODEC_DCT_H */