X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gr-atsc%2Fsrc%2Flib%2Fqa_atsci_fake_single_viterbi.cc;fp=gr-atsc%2Fsrc%2Flib%2Fqa_atsci_fake_single_viterbi.cc;h=f50f3b6b8c3974cb153dbf3b60a9d803a4777b6b;hb=8a9ddbb0675f9bfcc6e03b457fba6c79474a3693;hp=0000000000000000000000000000000000000000;hpb=82d471b9b4a8b389b5da44b19c69c36420828382;p=debian%2Fgnuradio

diff --git a/gr-atsc/src/lib/qa_atsci_fake_single_viterbi.cc b/gr-atsc/src/lib/qa_atsci_fake_single_viterbi.cc
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@@ -0,0 +1,144 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <cppunit/TestAssert.h>
+#include <stdio.h>
+#include <atsci_fake_single_viterbi.h>
+#include <qa_atsci_fake_single_viterbi.h>
+#include <random.h>
+#include <string.h>
+
+
+static const int NTRIALS     =   50;
+static const int MAXERRORS   =   10;
+static const int NN          =  200;
+
+static const int MAXDIBIT    = 3;
+
+void
+qa_atsci_fake_single_viterbi::encode_block (unsigned char *out, unsigned char *in, 
+				      unsigned int n)
+{
+  for (unsigned int i = 0; i < n; i++) {
+    out[i] = encoder.encode(in[i]);
+  }
+}
+
+
+void
+qa_atsci_fake_single_viterbi::decode_block (unsigned char *out, unsigned char *in, 
+				      unsigned int n)
+{
+  for (unsigned int i = 0; i < n; i++) {
+    out[i] = decoder.decode ((2*in[i]-7) + noise ());
+  }
+}
+
+float
+qa_atsci_fake_single_viterbi::noise ()
+{
+#if 1
+  return 2.0 * ((float) random () / RANDOM_MAX - 0.5);;
+#else
+  return 0;
+#endif
+}
+
+void
+qa_atsci_fake_single_viterbi::t0 ()
+{
+  int 			  blocklen = NN;
+  unsigned char		  in[blocklen];
+  unsigned char		  enc[blocklen];
+  unsigned char		  out[blocklen];
+  int			  decoder_errors = 0;
+  int			  delay = decoder.delay ();
+  int			  i;
+
+  // printf ("  Delay is %d.\n", delay);
+  
+  srandom (27);		// reproducable sequence of "random" values
+  
+  for (int nt = 0; nt < NTRIALS; nt++){
+
+    // load block with random data and encode
+
+    for (i = 0; i < (blocklen-delay); i++)
+      in[i] = random () & MAXDIBIT;
+    for (     ; i < blocklen; i++)
+      in[i] = 0;		/* To empty the delay buffers */
+
+    encoder.reset ();
+    encode_block (enc, in, blocklen);
+
+    decoder.reset ();
+
+    // decode the block
+    decode_block (out, enc, blocklen);
+
+    // int offset = delay/4;
+    int offset = 2;
+    bool differs = (memcmp (in+offset,
+			    out+delay+offset, blocklen-(delay+offset)));
+
+    // initial values after reset are 0
+    for (i = 0; i < delay; i++){
+      if (out[i] != 0)
+	printf ("  initial output at %i is %X, not 0\n",
+		i, out[i]);
+    }
+
+    if (differs){
+      printf ("  incorrect data, trial #%d\n", nt);
+
+      printf ("\n  Erroneous result dibits:");
+      for (int erri = 0; erri < (NN-delay); erri++) {
+	if (in[erri] != out[erri+delay])
+	  printf (" %d", erri);
+      }
+      printf ("\n  In:  ");
+      for (int erri = 0; erri < (NN-delay); erri++) {
+	printf (" %d", in[erri]);
+      }
+      printf ("\n  Out: ");
+      for (int erri = 0; erri < (NN-delay); erri++) {
+	printf (" %d", out[erri+delay]);
+      }
+      printf ("\n  Errs:");
+      for (int erri = 0; erri < (NN-delay); erri++) {
+	printf (" %c", (in[erri] != out[erri+delay])? '*': ' ');
+      }
+      printf ("\n    THIS IS A REAL PROBLEM.\n");
+      decoder_errors++;
+    }
+  }
+
+  printf ("  Summary: %d decoder errors out of %d trials.\n",
+	  decoder_errors, NTRIALS);
+
+  CPPUNIT_ASSERT (decoder_errors == 0);
+}
+