blob: 272422e44c91c8f5feae396900f79e38146abde3
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 | |
69 | int bits_per_sample; |
70 | } AVDCT; |
71 | |
72 | /** |
73 | * Allocates a AVDCT context. |
74 | * This needs to be initialized with avcodec_dct_init() after optionally |
75 | * configuring it with AVOptions. |
76 | * |
77 | * To free it use av_free() |
78 | */ |
79 | AVDCT *avcodec_dct_alloc(void); |
80 | int avcodec_dct_init(AVDCT *); |
81 | |
82 | const AVClass *avcodec_dct_get_class(void); |
83 | |
84 | #endif /* AVCODEC_AVDCT_H */ |
85 |