2 * This file is part of FFmpeg.
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.
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.
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
19 #ifndef AVCODEC_IMDCT15_H
20 #define AVCODEC_IMDCT15_H
26 typedef struct IMDCT15Context {
33 FFTComplex *twiddle_exptab;
35 FFTComplex *exptab[6];
38 * Calculate the middle half of the iMDCT
40 void (*imdct_half)(struct IMDCT15Context *s, float *dst, const float *src,
41 ptrdiff_t src_stride, float scale);
45 * Init an iMDCT of the length 2 * 15 * (2^N)
47 int ff_imdct15_init(IMDCT15Context **s, int N);
52 void ff_imdct15_uninit(IMDCT15Context **s);
55 void ff_imdct15_init_aarch64(IMDCT15Context *s);
57 #endif /* AVCODEC_IMDCT15_H */