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d2119f624d
Handles strides (needed for Opus transients), does pre-reindexing and folding without needing a copy. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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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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/* 0 - 18: fft15 twiddles, 19 - 20: fft5 twiddles */
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FFTComplex exptab[21];
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/**
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* Calculate a full 2N -> N MDCT
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*/
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void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
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/**
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* Calculate the middle half of the iMDCT
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*/
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void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,
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ptrdiff_t src_stride, float scale);
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} MDCT15Context;
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/**
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* Init an (i)MDCT of the length 2 * 15 * (2^N)
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*/
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int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
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/**
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* Frees a context
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*/
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void ff_mdct15_uninit(MDCT15Context **ps);
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#endif /* AVCODEC_MDCT15_H */
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