| /* |
| * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_MDCT15_H |
| #define AVCODEC_MDCT15_H |
| |
| #include <stddef.h> |
| |
| #include "fft.h" |
| |
| typedef struct MDCT15Context { |
| int fft_n; |
| int len2; |
| int len4; |
| int inverse; |
| int *pfa_prereindex; |
| int *pfa_postreindex; |
| |
| FFTContext ptwo_fft; |
| |
| FFTComplex *tmp; |
| |
| FFTComplex *twiddle_exptab; |
| |
| /* 0 - 18: fft15 twiddles, 19 - 20: fft5 twiddles */ |
| FFTComplex exptab[21]; |
| |
| /** |
| * Calculate a full 2N -> N MDCT |
| */ |
| void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride); |
| |
| /** |
| * Calculate the middle half of the iMDCT |
| */ |
| void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src, |
| ptrdiff_t src_stride, float scale); |
| } MDCT15Context; |
| |
| /** |
| * Init an (i)MDCT of the length 2 * 15 * (2^N) |
| */ |
| int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale); |
| |
| /** |
| * Frees a context |
| */ |
| void ff_mdct15_uninit(MDCT15Context **ps); |
| |
| #endif /* AVCODEC_MDCT15_H */ |