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4349 | Serge | 1 | /* |
2 | * Generate a header file for hardcoded ff_cos_* tables |
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3 | * |
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4 | * Copyright (c) 2009 Reimar Döffinger |
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5 | * |
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6 | * This file is part of FFmpeg. |
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7 | * |
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8 | * FFmpeg is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU Lesser General Public |
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10 | * License as published by the Free Software Foundation; either |
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11 | * version 2.1 of the License, or (at your option) any later version. |
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12 | * |
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13 | * FFmpeg is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * Lesser General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU Lesser General Public |
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19 | * License along with FFmpeg; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |||
23 | #include |
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24 | #include |
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25 | #include |
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26 | |||
27 | #define BITS 16 |
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28 | #define FLOATFMT "%.18e" |
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29 | #define FIXEDFMT "%6d" |
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30 | |||
31 | static int clip_f15(int v) |
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32 | { |
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33 | return v < -32767 ? -32767 : |
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34 | v > 32767 ? 32767 : |
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35 | v; |
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36 | } |
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37 | |||
38 | static void printval(double val, int fixed) |
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39 | { |
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40 | if (fixed) { |
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41 | /* lrint() isn't always available, so round and cast manually. */ |
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42 | double new_val = val * (double) (1 << 15); |
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43 | |||
44 | new_val = new_val >= 0 ? floor(new_val + 0.5) : ceil(new_val - 0.5); |
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45 | |||
46 | printf(" "FIXEDFMT",", clip_f15((long int) new_val)); |
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47 | } else { |
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48 | printf(" "FLOATFMT",", val); |
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49 | } |
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50 | } |
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51 | |||
52 | int main(int argc, char *argv[]) |
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53 | { |
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54 | int i, j; |
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55 | int do_sin = argc > 1 && !strcmp(argv[1], "sin"); |
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56 | int fixed = argc > 1 && strstr(argv[1], "fixed"); |
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57 | double (*func)(double) = do_sin ? sin : cos; |
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58 | |||
59 | printf("/* This file was automatically generated. */\n"); |
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60 | printf("#define CONFIG_FFT_FLOAT %d\n", !fixed); |
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61 | printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h"); |
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62 | for (i = 4; i <= BITS; i++) { |
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63 | int m = 1 << i; |
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64 | double freq = 2*3.14159265358979323846/m; |
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65 | printf("%s(%i) = {\n ", do_sin ? "SINTABLE" : "COSTABLE", m); |
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66 | for (j = 0; j < m/2 - 1; j++) { |
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67 | int idx = j > m/4 ? m/2 - j : j; |
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68 | if (do_sin && j >= m/4) |
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69 | idx = m/4 - j; |
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70 | printval(func(idx*freq), fixed); |
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71 | if ((j & 3) == 3) |
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72 | printf("\n "); |
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73 | } |
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74 | printval(func(do_sin ? -(m/4 - 1)*freq : freq), fixed); |
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75 | printf("\n};\n"); |
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76 | } |
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77 | return 0; |
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78 | }>><>=>><>> |