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1 | /* |
2 | * (I)RDFT transforms | |
3 | * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #if !defined(AVCODEC_RDFT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT) | |
23 | #define AVCODEC_RDFT_H | |
24 | ||
25 | #include "config.h" | |
26 | #include "fft.h" | |
27 | ||
28 | #if CONFIG_HARDCODED_TABLES | |
29 | # define SINTABLE_CONST const | |
30 | #else | |
31 | # define SINTABLE_CONST | |
32 | #endif | |
33 | ||
34 | #define SINTABLE(size) \ | |
35 | SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] | |
36 | ||
37 | extern SINTABLE(16); | |
38 | extern SINTABLE(32); | |
39 | extern SINTABLE(64); | |
40 | extern SINTABLE(128); | |
41 | extern SINTABLE(256); | |
42 | extern SINTABLE(512); | |
43 | extern SINTABLE(1024); | |
44 | extern SINTABLE(2048); | |
45 | extern SINTABLE(4096); | |
46 | extern SINTABLE(8192); | |
47 | extern SINTABLE(16384); | |
48 | extern SINTABLE(32768); | |
49 | extern SINTABLE(65536); | |
50 | ||
51 | struct RDFTContext { | |
52 | int nbits; | |
53 | int inverse; | |
54 | int sign_convention; | |
55 | ||
56 | /* pre/post rotation tables */ | |
57 | const FFTSample *tcos; | |
58 | SINTABLE_CONST FFTSample *tsin; | |
59 | FFTContext fft; | |
60 | void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); | |
61 | }; | |
62 | ||
63 | /** | |
64 | * Set up a real FFT. | |
65 | * @param nbits log2 of the length of the input array | |
66 | * @param trans the type of transform | |
67 | */ | |
68 | int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); | |
69 | void ff_rdft_end(RDFTContext *s); | |
70 | ||
71 | void ff_rdft_init_arm(RDFTContext *s); | |
72 | ||
73 | ||
74 | #endif /* AVCODEC_RDFT_H */ |