aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/dct.h
blob: 75f40b9f84cbd7b6677e70b8c831c2d99873e592 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
/*
 * (I)DCT Transforms
 * Copyright (c) 2009 Peter Ross <pross@xvid.org>
 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
 * 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * 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)
#define AVCODEC_DCT_H

#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_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 */