| 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 | |
| 26 | typedef 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 | */ |
| 47 | int ff_celt_imdct_init(CeltIMDCTContext **s, int N); |
| 48 | |
| 49 | /** |
| 50 | * Free an iMDCT. |
| 51 | */ |
| 52 | void ff_celt_imdct_uninit(CeltIMDCTContext **s); |
| 53 | |
| 54 | |
| 55 | void ff_celt_imdct_init_aarch64(CeltIMDCTContext *s); |
| 56 | |
| 57 | #endif /* AVCODEC_OPUS_IMDCT_H */ |