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2ba45a60 DM |
1 | /* |
2 | * Generate a header file for hardcoded ff_cos_* tables | |
3 | * | |
4 | * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <stdio.h> | |
24 | #include <string.h> | |
25 | #include <math.h> | |
26 | ||
27 | #define BITS 16 | |
28 | #define FLOATFMT "%.18e" | |
29 | #define FIXEDFMT "%6d" | |
30 | ||
31 | static int clip_f15(int v) | |
32 | { | |
33 | return v < -32767 ? -32767 : | |
34 | v > 32767 ? 32767 : | |
35 | v; | |
36 | } | |
37 | ||
38 | static void printval(double val, int fixed) | |
39 | { | |
40 | if (fixed) { | |
41 | /* lrint() isn't always available, so round and cast manually. */ | |
42 | double new_val = val * (double) (1 << 15); | |
43 | ||
44 | new_val = new_val >= 0 ? floor(new_val + 0.5) : ceil(new_val - 0.5); | |
45 | ||
46 | printf(" "FIXEDFMT",", clip_f15((long int) new_val)); | |
47 | } else { | |
48 | printf(" "FLOATFMT",", val); | |
49 | } | |
50 | } | |
51 | ||
52 | int main(int argc, char *argv[]) | |
53 | { | |
54 | int i, j; | |
55 | int do_sin = argc > 1 && !strcmp(argv[1], "sin"); | |
56 | int fixed = argc > 1 && strstr(argv[1], "fixed"); | |
57 | double (*func)(double) = do_sin ? sin : cos; | |
58 | ||
59 | printf("/* This file was automatically generated. */\n"); | |
60 | printf("#define FFT_FLOAT %d\n", !fixed); | |
61 | printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h"); | |
62 | for (i = 4; i <= BITS; i++) { | |
63 | int m = 1 << i; | |
64 | double freq = 2*3.14159265358979323846/m; | |
65 | printf("%s(%i) = {\n ", do_sin ? "SINTABLE" : "COSTABLE", m); | |
66 | for (j = 0; j < m/2 - 1; j++) { | |
67 | int idx = j > m/4 ? m/2 - j : j; | |
68 | if (do_sin && j >= m/4) | |
69 | idx = m/4 - j; | |
70 | printval(func(idx*freq), fixed); | |
71 | if ((j & 3) == 3) | |
72 | printf("\n "); | |
73 | } | |
74 | printval(func(do_sin ? -(m/4 - 1)*freq : freq), fixed); | |
75 | printf("\n};\n"); | |
76 | } | |
77 | return 0; | |
78 | } |