FFmpeg
rdft.h
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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 struct RDFTContext {
29  int nbits;
30  int inverse;
32 
33  /* pre/post rotation tables */
34  const FFTSample *tcos;
35  const FFTSample *tsin;
39 };
40 
41 /**
42  * Set up a real FFT.
43  * @param nbits log2 of the length of the input array
44  * @param trans the type of transform
45  */
46 int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
48 
50 
51 
52 #endif /* AVCODEC_RDFT_H */
int nbits
Definition: rdft.h:29
void ff_rdft_end(RDFTContext *s)
Definition: rdft.c:114
RDFTransformType
Definition: avfft.h:71
float FFTSample
Definition: avfft.h:35
Definition: fft.h:88
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
#define s(width, name)
Definition: cbs_vp9.c:257
void ff_rdft_init_arm(RDFTContext *s)
Definition: rdft_init_arm.c:27
void(* rdft_calc)(struct RDFTContext *s, FFTSample *z)
Definition: rdft.h:38
const FFTSample * tsin
Definition: rdft.h:35
FFTContext fft
Definition: rdft.h:37
int negative_sin
Definition: rdft.h:36
int sign_convention
Definition: rdft.h:31
int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
Set up a real FFT.
Definition: rdft.c:88
int inverse
Definition: rdft.h:30
const FFTSample * tcos
Definition: rdft.h:34