1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> 3cabdff1aSopenharmony_ci * 4cabdff1aSopenharmony_ci * This file is part of FFmpeg. 5cabdff1aSopenharmony_ci * 6cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 7cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 8cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 9cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 10cabdff1aSopenharmony_ci * 11cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 12cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 13cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14cabdff1aSopenharmony_ci * Lesser General Public License for more details. 15cabdff1aSopenharmony_ci * 16cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 17cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 18cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19cabdff1aSopenharmony_ci */ 20cabdff1aSopenharmony_ci 21cabdff1aSopenharmony_ci#ifndef AVCODEC_MDCT15_H 22cabdff1aSopenharmony_ci#define AVCODEC_MDCT15_H 23cabdff1aSopenharmony_ci 24cabdff1aSopenharmony_ci#include <stddef.h> 25cabdff1aSopenharmony_ci 26cabdff1aSopenharmony_ci#include "libavutil/mem_internal.h" 27cabdff1aSopenharmony_ci 28cabdff1aSopenharmony_ci#include "fft.h" 29cabdff1aSopenharmony_ci 30cabdff1aSopenharmony_citypedef struct MDCT15Context { 31cabdff1aSopenharmony_ci int fft_n; 32cabdff1aSopenharmony_ci int len2; 33cabdff1aSopenharmony_ci int len4; 34cabdff1aSopenharmony_ci int inverse; 35cabdff1aSopenharmony_ci int *pfa_prereindex; 36cabdff1aSopenharmony_ci int *pfa_postreindex; 37cabdff1aSopenharmony_ci 38cabdff1aSopenharmony_ci FFTContext ptwo_fft; 39cabdff1aSopenharmony_ci FFTComplex *tmp; 40cabdff1aSopenharmony_ci FFTComplex *twiddle_exptab; 41cabdff1aSopenharmony_ci 42cabdff1aSopenharmony_ci DECLARE_ALIGNED(32, FFTComplex, exptab)[64]; 43cabdff1aSopenharmony_ci 44cabdff1aSopenharmony_ci /* 15-point FFT */ 45cabdff1aSopenharmony_ci void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride); 46cabdff1aSopenharmony_ci 47cabdff1aSopenharmony_ci /* PFA postrotate and exptab */ 48cabdff1aSopenharmony_ci void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); 49cabdff1aSopenharmony_ci 50cabdff1aSopenharmony_ci /* Calculate a full 2N -> N MDCT */ 51cabdff1aSopenharmony_ci void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride); 52cabdff1aSopenharmony_ci 53cabdff1aSopenharmony_ci /* Calculate the middle half of the iMDCT */ 54cabdff1aSopenharmony_ci void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src, 55cabdff1aSopenharmony_ci ptrdiff_t stride); 56cabdff1aSopenharmony_ci} MDCT15Context; 57cabdff1aSopenharmony_ci 58cabdff1aSopenharmony_ci/* Init an (i)MDCT of the length 2 * 15 * (2^N) */ 59cabdff1aSopenharmony_ciint ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale); 60cabdff1aSopenharmony_civoid ff_mdct15_uninit(MDCT15Context **ps); 61cabdff1aSopenharmony_ci 62cabdff1aSopenharmony_civoid ff_mdct15_init_x86(MDCT15Context *s); 63cabdff1aSopenharmony_ci 64cabdff1aSopenharmony_ci#endif /* AVCODEC_MDCT15_H */ 65