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52 lines
1.5 KiB
52 lines
1.5 KiB
/* |
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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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