/* * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_MDCT15_H #define AVCODEC_MDCT15_H #include <stddef.h> #include "fft.h" typedef struct MDCT15Context { int fft_n; int len2; int len4; int inverse; int *pfa_prereindex; int *pfa_postreindex; FFTContext ptwo_fft; FFTComplex *tmp; FFTComplex *twiddle_exptab; DECLARE_ALIGNED(32, FFTComplex, exptab)[64]; /* 15-point FFT */ void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride); /* PFA postrotate and exptab */ void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); /* Calculate a full 2N -> N MDCT */ void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride); /* Calculate the middle half of the iMDCT */ void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride); } MDCT15Context; /* Init an (i)MDCT of the length 2 * 15 * (2^N) */ int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale); void ff_mdct15_uninit(MDCT15Context **ps); void ff_mdct15_init_x86(MDCT15Context *s); #endif /* AVCODEC_MDCT15_H */