Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / fft-internal.h
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 #if FFT_FLOAT
23
24 #define FIX15(v) (v)
25 #define sqrthalf (float)M_SQRT1_2
26
27 #define BF(x, y, a, b) do { \
28 x = a - b; \
29 y = a + b; \
30 } while (0)
31
32 #define CMUL(dre, dim, are, aim, bre, bim) do { \
33 (dre) = (are) * (bre) - (aim) * (bim); \
34 (dim) = (are) * (bim) + (aim) * (bre); \
35 } while (0)
36
37 #else
38
39 #define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
40
41 #if FFT_FIXED_32
42
43 #define CMUL(dre, dim, are, aim, bre, bim) do { \
44 int64_t accu; \
45 (accu) = (int64_t)(bre) * (are); \
46 (accu) -= (int64_t)(bim) * (aim); \
47 (dre) = (int)(((accu) + 0x40000000) >> 31); \
48 (accu) = (int64_t)(bre) * (aim); \
49 (accu) += (int64_t)(bim) * (are); \
50 (dim) = (int)(((accu) + 0x40000000) >> 31); \
51 } while (0)
52
53 #define FIX15(a) av_clip(SCALE_FLOAT(a, 31), -2147483647, 2147483647)
54
55 #else /* FFT_FIXED_32 */
56
57 #include "fft.h"
58 #include "mathops.h"
59
60 void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input);
61
62 #define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767)
63
64 #define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2))
65
66 #define BF(x, y, a, b) do { \
67 x = (a - b) >> 1; \
68 y = (a + b) >> 1; \
69 } while (0)
70
71 #define CMULS(dre, dim, are, aim, bre, bim, sh) do { \
72 (dre) = (MUL16(are, bre) - MUL16(aim, bim)) >> sh; \
73 (dim) = (MUL16(are, bim) + MUL16(aim, bre)) >> sh; \
74 } while (0)
75
76 #define CMUL(dre, dim, are, aim, bre, bim) \
77 CMULS(dre, dim, are, aim, bre, bim, 15)
78
79 #define CMULL(dre, dim, are, aim, bre, bim) \
80 CMULS(dre, dim, are, aim, bre, bim, 0)
81
82 #endif /* FFT_FIXED_32 */
83
84 #endif /* FFT_FLOAT */
85
86 #define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c)
87 #define ff_imdct_half_c FFT_NAME(ff_imdct_half_c)
88 #define ff_mdct_calc_c FFT_NAME(ff_mdct_calc_c)
89
90 void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
91 void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
92 void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
93
94 #endif /* AVCODEC_FFT_INTERNAL_H */