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366 lines
8.3 KiB
C
366 lines
8.3 KiB
C
/*
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* ieeetest.c --- test IDCT code against the IEEE Std 1180-1990 spec
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*
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* Note that this does only one pass of the test.
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* Six invocations of ieeetest are needed to complete the entire spec.
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* The shell script "doieee" performs the complete test.
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*
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* Written by Tom Lane (tgl@cs.cmu.edu).
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* Released to public domain 11/22/93.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <gst/gst.h>
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#include <gst/idct/idct.h>
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#include "dct.h"
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/* prototypes */
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void usage (char *msg);
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long ieeerand (long L, long H);
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void dct_init (void);
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void ref_fdct (DCTELEM block[8][8]);
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void ref_idct (DCTELEM block[8][8]);
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/* error stat accumulators -- assume initialized to 0 */
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long sumerrs[DCTSIZE2];
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long sumsqerrs[DCTSIZE2];
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int maxerr[DCTSIZE2];
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char *
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meets (double val, double limit)
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{
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return ((fabs (val) <= limit) ? "meets" : "FAILS");
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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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long minpix, maxpix, sign;
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long curiter, niters;
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int i, j;
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double max, total;
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int method;
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DCTELEM block[DCTSIZE2]; /* random source data */
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DCTELEM refcoefs[DCTSIZE2]; /* coefs from reference FDCT */
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DCTELEM refout[DCTSIZE2]; /* output from reference IDCT */
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DCTELEM testout[DCTSIZE2]; /* output from test IDCT */
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GstIDCT *idct;
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guint64 tscstart, tscmin = ~0, tscmax = 0;
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guint64 tscstop;
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/* Argument parsing --- not very bulletproof at all */
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if (argc != 6)
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usage (NULL);
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method = atoi (argv[1]);
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minpix = atoi (argv[2]);
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maxpix = atoi (argv[3]);
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sign = atoi (argv[4]);
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niters = atol (argv[5]);
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gst_library_load ("gstidct");
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idct = gst_idct_new (method);
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if (idct == 0) {
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printf ("method not available\n\n\n");
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return 0;
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}
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dct_init ();
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/* Loop once per generated random-data block */
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for (curiter = 0; curiter < niters; curiter++) {
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/* generate a pseudo-random block of data */
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for (i = 0; i < DCTSIZE2; i++)
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block[i] = (DCTELEM) (ieeerand (-minpix, maxpix) * sign);
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/* perform reference FDCT */
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memcpy (refcoefs, block, sizeof (DCTELEM) * DCTSIZE2);
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ref_fdct ((DCTELEM **) & refcoefs);
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/* clip */
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for (i = 0; i < DCTSIZE2; i++) {
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if (refcoefs[i] < -2048)
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refcoefs[i] = -2048;
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else if (refcoefs[i] > 2047)
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refcoefs[i] = 2047;
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}
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/* perform reference IDCT */
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memcpy (refout, refcoefs, sizeof (DCTELEM) * DCTSIZE2);
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ref_idct (refout);
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/* clip */
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for (i = 0; i < DCTSIZE2; i++) {
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if (refout[i] < -256)
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refout[i] = -256;
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else if (refout[i] > 255)
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refout[i] = 255;
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}
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/* perform test IDCT */
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if (GST_IDCT_TRANSPOSE (idct)) {
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for (j = 0; j < DCTSIZE; j++) {
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for (i = 0; i < DCTSIZE; i++) {
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testout[i * DCTSIZE + j] = refcoefs[j * DCTSIZE + i];
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}
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}
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} else {
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memcpy (testout, refcoefs, sizeof (DCTELEM) * DCTSIZE2);
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}
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gst_trace_read_tsc (&tscstart);
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gst_idct_convert (idct, testout);
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gst_trace_read_tsc (&tscstop);
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/*printf("time %llu, %llu %lld\n", tscstart, tscstop, tscstop-tscstart); */
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if (tscstop - tscstart < tscmin)
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tscmin = tscstop - tscstart;
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if (tscstop - tscstart > tscmax)
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tscmax = tscstop - tscstart;
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/* clip */
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for (i = 0; i < DCTSIZE2; i++) {
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if (testout[i] < -256)
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testout[i] = -256;
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else if (testout[i] > 255)
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testout[i] = 255;
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}
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/* accumulate error stats */
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for (i = 0; i < DCTSIZE2; i++) {
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register int err = testout[i] - refout[i];
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sumerrs[i] += err;
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sumsqerrs[i] += err * err;
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if (err < 0)
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err = -err;
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if (maxerr[i] < err)
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maxerr[i] = err;
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}
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if (curiter % 100 == 99) {
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fprintf (stderr, ".");
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fflush (stderr);
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}
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}
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fprintf (stderr, "\n");
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/* print results */
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printf
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("IEEE test conditions: -L = %ld, +H = %ld, sign = %ld, #iters = %ld\n",
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minpix, maxpix, sign, niters);
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printf ("Speed, min time %lld, max %lld\n", tscmin, tscmax);
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printf ("Peak absolute values of errors:\n");
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for (i = 0, j = 0; i < DCTSIZE2; i++) {
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if (j < maxerr[i])
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j = maxerr[i];
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printf ("%4d", maxerr[i]);
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if ((i % DCTSIZE) == DCTSIZE - 1)
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printf ("\n");
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}
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printf ("Worst peak error = %d (%s spec limit 1)\n\n", j,
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meets ((double) j, 1.0));
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printf ("Mean square errors:\n");
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max = total = 0.0;
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for (i = 0; i < DCTSIZE2; i++) {
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double err = (double) sumsqerrs[i] / ((double) niters);
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total += (double) sumsqerrs[i];
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if (max < err)
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max = err;
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printf (" %8.4f", err);
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if ((i % DCTSIZE) == DCTSIZE - 1)
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printf ("\n");
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}
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printf ("Worst pmse = %.6f (%s spec limit 0.06)\n", max, meets (max, 0.06));
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total /= (double) (64 * niters);
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printf ("Overall mse = %.6f (%s spec limit 0.02)\n\n", total,
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meets (total, 0.02));
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printf ("Mean errors:\n");
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max = total = 0.0;
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for (i = 0; i < DCTSIZE2; i++) {
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double err = (double) sumerrs[i] / ((double) niters);
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total += (double) sumerrs[i];
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printf (" %8.4f", err);
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if (err < 0.0)
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err = -err;
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if (max < err)
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max = err;
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if ((i % DCTSIZE) == DCTSIZE - 1)
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printf ("\n");
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}
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printf ("Worst mean error = %.6f (%s spec limit 0.015)\n", max,
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meets (max, 0.015));
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total /= (double) (64 * niters);
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printf ("Overall mean error = %.6f (%s spec limit 0.0015)\n\n", total,
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meets (total, 0.0015));
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/* test for 0 input giving 0 output */
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memset (testout, 0, sizeof (DCTELEM) * DCTSIZE2);
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gst_idct_convert (idct, testout);
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for (i = 0, j = 0; i < DCTSIZE2; i++) {
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if (testout[i]) {
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printf ("Position %d of IDCT(0) = %d (FAILS)\n", i, testout[i]);
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j++;
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}
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}
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printf ("%d elements of IDCT(0) were not zero\n\n\n", j);
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exit (0);
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return 0;
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}
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void
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usage (char *msg)
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{
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if (msg != NULL)
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fprintf (stderr, "\nerror: %s\n", msg);
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fprintf (stderr, "\n");
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fprintf (stderr, "usage: ieeetest minpix maxpix sign niters\n");
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fprintf (stderr, "\n");
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fprintf (stderr, " test = 1 - 5\n");
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fprintf (stderr, " minpix = -L value per IEEE spec\n");
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fprintf (stderr, " maxpix = H value per IEEE spec\n");
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fprintf (stderr, " sign = +1 for normal, -1 to run negated test\n");
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fprintf (stderr, " niters = # iterations (10000 for full test)\n");
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fprintf (stderr, "\n");
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exit (1);
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}
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/* Pseudo-random generator specified by IEEE 1180 */
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long
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ieeerand (long L, long H)
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{
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static long randx = 1;
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static double z = (double) 0x7fffffff;
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long i, j;
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double x;
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randx = (randx * 1103515245) + 12345;
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i = randx & 0x7ffffffe;
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x = ((double) i) / z;
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x *= (L + H + 1);
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j = x;
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return j - L;
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}
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/* Reference double-precision FDCT and IDCT */
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/* The cosine lookup table */
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/* coslu[a][b] = C(b)/2 * cos[(2a+1)b*pi/16] */
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double coslu[8][8];
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/* Routine to initialise the cosine lookup table */
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void
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dct_init (void)
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{
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int a, b;
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double tmp;
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for (a = 0; a < 8; a++)
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for (b = 0; b < 8; b++) {
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tmp = cos ((double) ((a + a + 1) * b) * (3.14159265358979323846 / 16.0));
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if (b == 0)
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tmp /= sqrt (2.0);
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coslu[a][b] = tmp * 0.5;
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}
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}
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void
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ref_fdct (DCTELEM block[8][8])
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{
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int x, y, u, v;
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double tmp, tmp2;
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double res[8][8];
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for (v = 0; v < 8; v++) {
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for (u = 0; u < 8; u++) {
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tmp = 0.0;
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for (y = 0; y < 8; y++) {
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tmp2 = 0.0;
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for (x = 0; x < 8; x++) {
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tmp2 += (double) block[y][x] * coslu[x][u];
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}
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tmp += coslu[y][v] * tmp2;
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}
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res[v][u] = tmp;
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}
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}
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for (v = 0; v < 8; v++) {
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for (u = 0; u < 8; u++) {
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tmp = res[v][u];
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if (tmp < 0.0) {
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x = -((int) (0.5 - tmp));
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} else {
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x = (int) (tmp + 0.5);
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}
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block[v][u] = (DCTELEM) x;
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}
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}
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}
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void
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ref_idct (DCTELEM block[8][8])
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{
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int x, y, u, v;
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double tmp, tmp2;
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double res[8][8];
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for (y = 0; y < 8; y++) {
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for (x = 0; x < 8; x++) {
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tmp = 0.0;
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for (v = 0; v < 8; v++) {
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tmp2 = 0.0;
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for (u = 0; u < 8; u++) {
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tmp2 += (double) block[v][u] * coslu[x][u];
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}
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tmp += coslu[y][v] * tmp2;
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}
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res[y][x] = tmp;
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}
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}
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for (v = 0; v < 8; v++) {
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for (u = 0; u < 8; u++) {
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tmp = res[v][u];
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if (tmp < 0.0) {
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x = -((int) (0.5 - tmp));
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} else {
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x = (int) (tmp + 0.5);
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}
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block[v][u] = (DCTELEM) x;
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}
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}
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}
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