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https://github.com/librempeg/librempeg
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0780ad9c68
It is redundant with costable. The first half of sintable is identical with the second half of costable. The second half of sintable is negative value of the first half of sintable. The computation is changed to handle sign of sin values, in C code and ARM assembly code. Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
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* (I)RDFT transforms
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* Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined(AVCODEC_RDFT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT)
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#define AVCODEC_RDFT_H
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#include "config.h"
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#include "fft.h"
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struct RDFTContext {
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int nbits;
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int inverse;
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int sign_convention;
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/* pre/post rotation tables */
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const FFTSample *tcos;
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const FFTSample *tsin;
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int negative_sin;
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FFTContext fft;
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void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
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};
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/**
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* Set up a real FFT.
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* @param nbits log2 of the length of the input array
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* @param trans the type of transform
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*/
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int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
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void ff_rdft_end(RDFTContext *s);
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void ff_rdft_init_arm(RDFTContext *s);
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#endif /* AVCODEC_RDFT_H */
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