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59 lines
1.5 KiB
59 lines
1.5 KiB
/* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_IMDCT15_H |
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#define AVCODEC_IMDCT15_H |
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#include <stddef.h> |
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#include "fft.h" |
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typedef struct IMDCT15Context { |
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int fft_n; |
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int len2; |
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int len4; |
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int *pfa_prereindex; |
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int *pfa_postreindex; |
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FFTContext ptwo_fft; |
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FFTComplex *tmp; |
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FFTComplex *twiddle_exptab; |
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/* 0 - 18: fft15 twiddles, 19 - 20: fft5 twiddles */ |
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FFTComplex exptab[21]; |
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/** |
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* Calculate the middle half of the iMDCT |
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*/ |
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void (*imdct_half)(struct IMDCT15Context *s, float *dst, const float *src, |
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ptrdiff_t src_stride, float scale); |
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} IMDCT15Context; |
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/** |
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* Init an iMDCT of the length 2 * 15 * (2^N) |
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*/ |
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int ff_imdct15_init(IMDCT15Context **s, int N); |
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/** |
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* Free an iMDCT. |
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*/ |
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void ff_imdct15_uninit(IMDCT15Context **s); |
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#endif /* AVCODEC_IMDCT15_H */
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