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![Diego Biurrun](/assets/img/avatar_default.png)
This is consistent with how all other table generation programs are named. Moreover this ensures that the cos table generation program is correctly deleted when cleaning the tree.
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/*
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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 > 1 && strstr(argv[1], "fixed");
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double (*func)(double) = do_sin ? sin : cos;
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printf("/* This file was automatically generated. */\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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