X-Git-Url: https://git.gag.com/?p=debian%2Fgnuradio;a=blobdiff_plain;f=gr-atsc%2Fsrc%2Flib%2Fqa_atsci_randomizer.cc;fp=gr-atsc%2Fsrc%2Flib%2Fqa_atsci_randomizer.cc;h=b2d0bde8ab20b89b3ea9530eaaa2206005cda9df;hp=0000000000000000000000000000000000000000;hb=8a9ddbb0675f9bfcc6e03b457fba6c79474a3693;hpb=82d471b9b4a8b389b5da44b19c69c36420828382

diff --git a/gr-atsc/src/lib/qa_atsci_randomizer.cc b/gr-atsc/src/lib/qa_atsci_randomizer.cc
new file mode 100644
index 00000000..b2d0bde8
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+++ b/gr-atsc/src/lib/qa_atsci_randomizer.cc
@@ -0,0 +1,145 @@
+/* -*- 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.
+ */
+
+#include <qa_atsci_randomizer.h>
+
+#include <cppunit/TestAssert.h>
+#include <string.h>
+
+static unsigned int expected_initial_states[] = {
+  0x018f,
+  0xd3db,
+  0xbaf1,
+  0x8e64,
+  0x4732,
+  0x2399,
+  0xc2d0,
+  0x6168
+};
+
+static unsigned char expected_initial_values[] = {
+  0xc0,
+  0x6d,
+  0x3f,
+  0x99,
+  0x38,
+  0x6a,
+  0x29,
+  0x52
+};
+
+#define	NELEMENTS(ary) ((sizeof (ary)) / sizeof (ary[0]))
+
+void
+qa_atsci_randomizer::t0_compare_output_maps ()
+{
+  for (int i = 0; i < 0x10000; i++){
+    unsigned char slow = atsci_randomizer::slow_output_map(i);
+    unsigned char fast = atsci_randomizer::fast_output_map(i);
+    CPPUNIT_ASSERT_EQUAL (slow, fast);
+  }
+}
+
+void
+qa_atsci_randomizer::t1_initial_states ()
+{
+  // LFSR should start with expected states
+
+  for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
+    unsigned int got = randomizer.state();
+    randomizer.clk ();
+    CPPUNIT_ASSERT_EQUAL (expected_initial_states[i], got);
+  }
+}
+
+void
+qa_atsci_randomizer::t2_initial_values ()
+{
+  // LFSR should start with expected values
+
+  for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
+    unsigned char got = randomizer.output_and_clk ();
+    CPPUNIT_ASSERT_EQUAL (expected_initial_values[i], got);
+  }
+}
+
+void
+qa_atsci_randomizer::t3_reset ()
+{
+  // LFSR should start with expected values
+
+  for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
+    unsigned char got = randomizer.output_and_clk ();
+    CPPUNIT_ASSERT_EQUAL (expected_initial_values[i], got);
+  }
+
+  randomizer.reset ();	// reset LFSR
+  
+  // and now should repeat expected values
+
+  for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
+    unsigned char got = randomizer.output_and_clk ();
+    CPPUNIT_ASSERT_EQUAL (expected_initial_values[i], got);
+  }
+}
+
+void
+qa_atsci_randomizer::t4_high_level ()
+{
+  static const int	N = 5;
+
+  atsc_mpeg_packet		in[N];
+  atsc_mpeg_packet_no_sync	middle[N];
+  atsc_mpeg_packet		out[N];
+  
+  memset (in, 0, sizeof (in));
+  memset (middle, 0, sizeof (middle));
+  memset (out, 0, sizeof (out));
+
+  // setup input test data
+
+  int	counter = 0xff;
+  for (int n = 0; n < N; n++){
+    in[n].data[0] = MPEG_SYNC_BYTE;
+    for (int i = 0; i < ATSC_MPEG_DATA_LENGTH; i++)
+      in[n].data[i + 1] = counter++;
+  }
+
+  // randomize N packets
+
+  for (int n = 0; n < N; n++)
+    randomizer.randomize (middle[n], in[n]);
+
+  // reset LFSR and derandomize N packets
+
+  randomizer.reset ();	// reset LFSR
+
+  for (int n = 0; n < N; n++)
+    randomizer.derandomize (out[n], middle[n]);
+
+  // compare packets
+
+  for (int n = 0; n < N; n++){
+    CPPUNIT_ASSERT (in[n] == out[n]);
+  }
+}
+