From 42774d3128b91d5a37344cb40d56d3c4d147e5f2 Mon Sep 17 00:00:00 2001 From: Dave Hooper Date: Wed, 17 Feb 2010 00:49:53 +0000 Subject: Merge from branches/mdctexp - faster ifft+imdct in codec lib git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24712 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/lib/fft.h | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 apps/codecs/lib/fft.h (limited to 'apps/codecs/lib/fft.h') diff --git a/apps/codecs/lib/fft.h b/apps/codecs/lib/fft.h new file mode 100644 index 0000000000..302a3b3996 --- /dev/null +++ b/apps/codecs/lib/fft.h @@ -0,0 +1,64 @@ +/* + * WMA compatible decoder + * Copyright (c) 2002 The FFmpeg Project. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef CODECLIB_FFT_H_INCLUDED +#define CODECLIB_FFT_H_INCLUDED + +#include +typedef int32_t fixed32; +typedef int64_t fixed64; + +#define FFT_FIXED + +#ifdef FFT_FIXED +typedef fixed32 FFTSample; +#else /* FFT_FIXED */ +typedef float FFTSample; +#endif /* FFT_FIXED */ + +typedef struct FFTComplex { + FFTSample re, im; +} FFTComplex; + +typedef struct FFTContext { + int nbits; + int inverse; + uint16_t *revtab; + int mdct_size; /* size of MDCT (i.e. number of input data * 2) */ + int mdct_bits; /* n = 2^nbits */ + /* pre/post rotation tables */ + FFTSample *tcos; + FFTSample *tsin; + void (*fft_permute)(struct FFTContext *s, FFTComplex *z); + void (*fft_calc)(struct FFTContext *s, FFTComplex *z); + void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); + void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input); + void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); + int split_radix; + int permutation; +#define FF_MDCT_PERM_NONE 0 +#define FF_MDCT_PERM_INTERLEAVE 1 +} FFTContext; + +// internal api (fft<->mdct) +//int fft_calc_unscaled(FFTContext *s, FFTComplex *z); +//void ff_fft_permute_c(FFTContext *s, FFTComplex *z); // internal only? +void ff_fft_calc_c(int nbits, FFTComplex *z); + +#endif // CODECLIB_FFT_H_INCLUDED + -- cgit v1.2.3