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62 lines
2.0 KiB
62 lines
2.0 KiB
/* |
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* Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.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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#ifndef AVCODEC_MDCT15_H |
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#define AVCODEC_MDCT15_H |
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#include <stddef.h> |
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#include "fft.h" |
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typedef struct MDCT15Context { |
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int fft_n; |
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int len2; |
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int len4; |
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int inverse; |
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int *pfa_prereindex; |
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int *pfa_postreindex; |
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FFTContext ptwo_fft; |
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FFTComplex *tmp; |
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FFTComplex *twiddle_exptab; |
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DECLARE_ALIGNED(32, FFTComplex, exptab)[64]; |
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/* 15-point FFT */ |
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void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride); |
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/* PFA postrotate and exptab */ |
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void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); |
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/* Calculate a full 2N -> N MDCT */ |
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void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride); |
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/* Calculate the middle half of the iMDCT */ |
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void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src, |
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ptrdiff_t stride); |
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} MDCT15Context; |
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/* Init an (i)MDCT of the length 2 * 15 * (2^N) */ |
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int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale); |
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void ff_mdct15_uninit(MDCT15Context **ps); |
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void ff_mdct15_init_x86(MDCT15Context *s); |
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#endif /* AVCODEC_MDCT15_H */
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