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111 lines
3.5 KiB
111 lines
3.5 KiB
/* |
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard |
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
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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_FFT_H |
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#define AVCODEC_FFT_H |
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#include <stdint.h> |
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#include "config.h" |
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#include "libavutil/mem.h" |
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#include "avfft.h" |
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/* FFT computation */ |
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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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FFTComplex *tmp_buf; |
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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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/** |
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* Do the permutation needed BEFORE calling fft_calc(). |
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*/ |
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void (*fft_permute)(struct FFTContext *s, FFTComplex *z); |
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/** |
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* Do a complex FFT with the parameters defined in ff_fft_init(). The |
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* input data must be permuted before. No 1.0/sqrt(n) normalization is done. |
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*/ |
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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 fft_permutation; |
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#define FF_FFT_PERM_DEFAULT 0 |
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#define FF_FFT_PERM_SWAP_LSBS 1 |
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int mdct_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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}; |
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#if CONFIG_HARDCODED_TABLES |
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#define COSTABLE_CONST const |
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#else |
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#define COSTABLE_CONST |
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#endif |
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#define COSTABLE(size) \ |
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COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_cos_##size)[size/2] |
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extern COSTABLE(16); |
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extern COSTABLE(32); |
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extern COSTABLE(64); |
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extern COSTABLE(128); |
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extern COSTABLE(256); |
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extern COSTABLE(512); |
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extern COSTABLE(1024); |
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extern COSTABLE(2048); |
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extern COSTABLE(4096); |
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extern COSTABLE(8192); |
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extern COSTABLE(16384); |
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extern COSTABLE(32768); |
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extern COSTABLE(65536); |
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extern COSTABLE_CONST FFTSample* const ff_cos_tabs[17]; |
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/** |
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* Initialize the cosine table in ff_cos_tabs[index] |
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* \param index index in ff_cos_tabs array of the table to initialize |
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*/ |
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void ff_init_ff_cos_tabs(int index); |
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/** |
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* Set up a complex FFT. |
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* @param nbits log2 of the length of the input array |
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* @param inverse if 0 perform the forward transform, if 1 perform the inverse |
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*/ |
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int ff_fft_init(FFTContext *s, int nbits, int inverse); |
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void ff_fft_init_altivec(FFTContext *s); |
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void ff_fft_init_mmx(FFTContext *s); |
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void ff_fft_init_arm(FFTContext *s); |
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void ff_fft_end(FFTContext *s); |
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int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale); |
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void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); |
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void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input); |
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void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); |
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void ff_mdct_end(FFTContext *s); |
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#endif /* AVCODEC_FFT_H */
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