2 * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_MDCT15_H
22 #define AVCODEC_MDCT15_H
28 typedef struct MDCT15Context {
40 FFTComplex *twiddle_exptab;
42 /* 0 - 18: fft15 twiddles, 19 - 20: fft5 twiddles */
43 FFTComplex exptab[21];
46 * Calculate a full 2N -> N MDCT
48 void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
51 * Calculate the middle half of the iMDCT
53 void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,
54 ptrdiff_t src_stride, float scale);
58 * Init an (i)MDCT of the length 2 * 15 * (2^N)
60 int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
65 void ff_mdct15_uninit(MDCT15Context **ps);
67 #endif /* AVCODEC_MDCT15_H */