blob: 0a8f7d05cf8dbe388c7b8ed8d7e96fd03f6847af
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 */ |
95 |