42774d3128
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24712 a1c6a512-1295-4272-9138-f99709370657
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*
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* WMA compatible decoder
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* Copyright (c) 2002 The FFmpeg Project.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef CODECLIB_FFT_H_INCLUDED
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#define CODECLIB_FFT_H_INCLUDED
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#include <inttypes.h>
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typedef int32_t fixed32;
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typedef int64_t fixed64;
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#define FFT_FIXED
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#ifdef FFT_FIXED
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typedef fixed32 FFTSample;
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#else /* FFT_FIXED */
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typedef float FFTSample;
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#endif /* FFT_FIXED */
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typedef struct FFTComplex {
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FFTSample re, im;
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} FFTComplex;
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typedef struct FFTContext {
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int nbits;
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int inverse;
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uint16_t *revtab;
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int mdct_size; /* size of MDCT (i.e. number of input data * 2) */
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int mdct_bits; /* n = 2^nbits */
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/* pre/post rotation tables */
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FFTSample *tcos;
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FFTSample *tsin;
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void (*fft_permute)(struct FFTContext *s, FFTComplex *z);
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void (*fft_calc)(struct FFTContext *s, FFTComplex *z);
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void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
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void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
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void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
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int split_radix;
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int permutation;
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#define FF_MDCT_PERM_NONE 0
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#define FF_MDCT_PERM_INTERLEAVE 1
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} FFTContext;
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// internal api (fft<->mdct)
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//int fft_calc_unscaled(FFTContext *s, FFTComplex *z);
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//void ff_fft_permute_c(FFTContext *s, FFTComplex *z); // internal only?
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void ff_fft_calc_c(int nbits, FFTComplex *z);
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#endif // CODECLIB_FFT_H_INCLUDED
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