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_FFT_INTERNAL_H
20 #define AVCODEC_FFT_INTERNAL_H
21 
22 #include "libavutil/mathematics.h"
23 #include "fft.h"
24 
25 #if FFT_FLOAT
26 
27 #define FIX15(v) (v)
28 #define sqrthalf (float)M_SQRT1_2
29 
30 #define BF(x, y, a, b) do {                     \
31         x = a - b;                              \
32         y = a + b;                              \
33     } while (0)
34 
35 #define CMUL(dre, dim, are, aim, bre, bim) do { \
36         (dre) = (are) * (bre) - (aim) * (bim);  \
37         (dim) = (are) * (bim) + (aim) * (bre);  \
38     } while (0)
39 
40 #else /* FFT_FLOAT */
41 
42 #define CMUL(dre, dim, are, aim, bre, bim) do {             \
43         int64_t accu;                                     \
44         (accu)  = (int64_t)(bre) * (are);                 \
45         (accu) -= (int64_t)(bim) * (aim);                 \
46         (dre)   = (int)(((accu) + 0x40000000) >> 31);       \
47         (accu)  = (int64_t)(bre) * (aim);                 \
48         (accu) += (int64_t)(bim) * (are);                 \
49         (dim)   = (int)(((accu) + 0x40000000) >> 31);       \
50     } while (0)
51 
52 #endif /* FFT_FLOAT */
53 
54 #define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c)
55 #define ff_imdct_half_c FFT_NAME(ff_imdct_half_c)
56 #define ff_mdct_calc_c  FFT_NAME(ff_mdct_calc_c)
57 
58 void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
59 void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
60 void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
61 
62 #endif /* AVCODEC_FFT_INTERNAL_H */
63