1/* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19#ifndef AVCODEC_OPUS_IMDCT_H 20#define AVCODEC_OPUS_IMDCT_H 21 22#include <stddef.h> 23 24#include "avfft.h" 25 26typedef struct CeltIMDCTContext { 27 int fft_n; 28 int len2; 29 int len4; 30 31 FFTComplex *tmp; 32 33 FFTComplex *twiddle_exptab; 34 35 FFTComplex *exptab[6]; 36 37 /** 38 * Calculate the middle half of the iMDCT 39 */ 40 void (*imdct_half)(struct CeltIMDCTContext *s, float *dst, const float *src, 41 ptrdiff_t src_stride, float scale); 42} CeltIMDCTContext; 43 44/** 45 * Init an iMDCT of the length 2 * 15 * (2^N) 46 */ 47int ff_celt_imdct_init(CeltIMDCTContext **s, int N); 48 49/** 50 * Free an iMDCT. 51 */ 52void ff_celt_imdct_uninit(CeltIMDCTContext **s); 53 54 55void ff_celt_imdct_init_aarch64(CeltIMDCTContext *s); 56 57#endif /* AVCODEC_OPUS_IMDCT_H */ 58