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74 lines
2.0 KiB
74 lines
2.0 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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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#ifndef AVCODEC_RDFT_H |
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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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#if CONFIG_HARDCODED_TABLES |
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# define SINTABLE_CONST const |
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#else |
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# define SINTABLE_CONST |
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#endif |
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#define SINTABLE(size) \ |
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SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] |
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extern SINTABLE(16); |
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extern SINTABLE(32); |
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extern SINTABLE(64); |
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extern SINTABLE(128); |
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extern SINTABLE(256); |
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extern SINTABLE(512); |
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extern SINTABLE(1024); |
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extern SINTABLE(2048); |
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extern SINTABLE(4096); |
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extern SINTABLE(8192); |
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extern SINTABLE(16384); |
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extern SINTABLE(32768); |
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extern SINTABLE(65536); |
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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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SINTABLE_CONST FFTSample *tsin; |
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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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