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1 | /* |
2 | * This file is part of FFmpeg. | |
3 | * | |
4 | * FFmpeg is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * FFmpeg is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with FFmpeg; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #ifndef AVCODEC_AVDCT_H | |
20 | #define AVCODEC_AVDCT_H | |
21 | ||
22 | #include "libavutil/opt.h" | |
23 | ||
24 | /** | |
25 | * AVDCT context. | |
26 | * @note function pointers can be NULL if the specific features have been | |
27 | * disabled at build time. | |
28 | */ | |
29 | typedef struct AVDCT { | |
30 | const AVClass *av_class; | |
31 | ||
32 | void (*idct)(int16_t *block /* align 16 */); | |
33 | ||
34 | /** | |
35 | * IDCT input permutation. | |
36 | * Several optimized IDCTs need a permutated input (relative to the | |
37 | * normal order of the reference IDCT). | |
38 | * This permutation must be performed before the idct_put/add. | |
39 | * Note, normally this can be merged with the zigzag/alternate scan<br> | |
40 | * An example to avoid confusion: | |
41 | * - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...) | |
42 | * - (x -> reference DCT -> reference IDCT -> x) | |
43 | * - (x -> reference DCT -> simple_mmx_perm = idct_permutation | |
44 | * -> simple_idct_mmx -> x) | |
45 | * - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant | |
46 | * -> simple_idct_mmx -> ...) | |
47 | */ | |
48 | uint8_t idct_permutation[64]; | |
49 | ||
50 | void (*fdct)(int16_t *block /* align 16 */); | |
51 | ||
52 | ||
53 | /** | |
54 | * DCT algorithm. | |
55 | * must use AVOptions to set this field. | |
56 | */ | |
57 | int dct_algo; | |
58 | ||
59 | /** | |
60 | * IDCT algorithm. | |
61 | * must use AVOptions to set this field. | |
62 | */ | |
63 | int idct_algo; | |
64 | ||
65 | void (*get_pixels)(int16_t *block /* align 16 */, | |
66 | const uint8_t *pixels /* align 8 */, | |
67 | ptrdiff_t line_size); | |
68 | } AVDCT; | |
69 | ||
70 | /** | |
71 | * Allocates a AVDCT context. | |
72 | * This needs to be initialized with avcodec_dct_init() after optionally | |
73 | * configuring it with AVOptions. | |
74 | * | |
75 | * To free it use av_free() | |
76 | */ | |
77 | AVDCT *avcodec_dct_alloc(void); | |
78 | int avcodec_dct_init(AVDCT *); | |
79 | ||
80 | const AVClass *avcodec_dct_get_class(void); | |
81 | ||
82 | #endif /* AVCODEC_AVDCT_H */ |