blob: 37c40e7c80d552cb72ccc332a064462f2772489d
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 */ |
75 |