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71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
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#include "config.h"
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#include <glib.h>
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#include <math.h>
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#define SCALE 256
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void
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get_taps (double *taps, double x)
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{
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taps[3] = x * x * (x - 1);
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taps[2] = x * (-x * x + x + 1);
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x = 1 - x;
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taps[1] = x * (-x * x + x + 1);
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taps[0] = x * x * (x - 1);
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}
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int
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main (int argc, char *argv[])
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{
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int i;
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g_print ("/* This file is autogenerated. Do not edit.*/\n");
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g_print ("#include <glib.h>\n");
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g_print ("gint8 cog_resample_table_4tap[256][4] = {\n");
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for (i = 0; i < 256; i++) {
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double x = i / 256.0;
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double taps[4];
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int t[4];
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int sum;
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get_taps (taps, x);
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taps[0] *= SCALE;
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taps[1] *= SCALE;
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taps[2] *= SCALE;
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taps[3] *= SCALE;
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t[0] = floor (taps[0]);
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t[1] = floor (taps[1]);
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t[2] = floor (taps[2]);
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t[3] = floor (taps[3]);
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sum = t[0] + t[1] + t[2] + t[3];
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for (; sum < SCALE; sum++) {
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int i;
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double max = 0;
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int max_i = -1;
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for (i = 0; i < 4; i++) {
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if (max_i == -1 || (t[i] < taps[i] && (taps[i] - t[i]) > max)) {
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max_i = i;
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max = taps[i] - t[i];
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}
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}
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t[max_i]++;
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}
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sum = t[0] + t[1] + t[2] + t[3];
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g_print (" { %d, %d, %d, %d }, /* %d %d */\n",
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t[0], t[1], t[2], t[3], t[2] + t[0], t[1] + t[3]);
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#if 0
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g_print ("/* %.3f %.3f %.3f %.3f %d */\n",
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taps[0] - t[0], taps[1] - t[1], taps[2] - t[2], taps[3] - t[3], sum);
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#endif
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}
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g_print ("};\n");
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g_print ("\n");
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return 0;
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}
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