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76 lines
2.3 KiB
76 lines
2.3 KiB
/* |
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* Generate a header file for hardcoded ff_cos_* tables |
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* |
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <stdio.h> |
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#include <string.h> |
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#include <math.h> |
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#ifndef M_PI |
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#define M_PI 3.14159265358979323846 |
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#endif |
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#define BITS 16 |
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#define FLOATFMT "%.18e" |
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#define FIXEDFMT "%6d" |
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static int clip_f15(int v) |
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{ |
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return v < -32767 ? -32767 : |
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v > 32767 ? 32767 : |
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v; |
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} |
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static void printval(double val, int fixed) |
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{ |
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if (fixed) |
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printf(" "FIXEDFMT",", clip_f15(lrint(val * (double)(1<<15)))); |
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else |
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printf(" "FLOATFMT",", val); |
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} |
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int main(int argc, char *argv[]) |
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{ |
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int i, j; |
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int do_sin = argc > 1 && !strcmp(argv[1], "sin"); |
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int fixed = argc > 2 && !strcmp(argv[2], "fixed"); |
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double (*func)(double) = do_sin ? sin : cos; |
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printf("/* This file was generated by libavcodec/costablegen */\n"); |
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printf("#define CONFIG_FFT_FLOAT %d\n", !fixed); |
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printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h"); |
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for (i = 4; i <= BITS; i++) { |
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int m = 1 << i; |
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double freq = 2*M_PI/m; |
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printf("%s(%i) = {\n ", do_sin ? "SINTABLE" : "COSTABLE", m); |
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for (j = 0; j < m/2 - 1; j++) { |
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int idx = j > m/4 ? m/2 - j : j; |
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if (do_sin && j >= m/4) |
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idx = m/4 - j; |
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printval(func(idx*freq), fixed); |
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if ((j & 3) == 3) |
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printf("\n "); |
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} |
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printval(func(do_sin ? -(m/4 - 1)*freq : freq), fixed); |
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printf("\n};\n"); |
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} |
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return 0; |
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}
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