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opus_imdct.h
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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 
32 
34 
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);
43 
44 /**
45  * Init an iMDCT of the length 2 * 15 * (2^N)
46  */
48 
49 /**
50  * Free an iMDCT.
51  */
53 
54 
56 
57 #endif /* AVCODEC_OPUS_IMDCT_H */