Merge branch 'dfsg-orig'

[debian/gnuradio] / gr-atsc / src / lib / GrAtscSegSymSyncImpl.cc

diff --git a/gr-atsc/src/lib/GrAtscSegSymSyncImpl.cc b/gr-atsc/src/lib/GrAtscSegSymSyncImpl.cc
new file mode 100644 (file)
index 0000000..a7925bf
--- /dev/null
+++ b/gr-atsc/src/lib/GrAtscSegSymSyncImpl.cc
@@ -0,0 +1,103 @@
+/* -*- 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 <GrAtscSegSymSyncImpl.h>
+#include <GrAtscSegSymSyncImpl_export.h>
+#include <cmath>
+#include <assert.h>
+
+GrAtscSegSymSyncImpl::GrAtscSegSymSyncImpl (
+    double nominal_ratio_of_rx_clock_to_symbol_freq)
+  : d_interp (nominal_ratio_of_rx_clock_to_symbol_freq)
+{
+  // set approximate decimation rate for superclass's benefit
+  decimation = (int) rint (nominal_ratio_of_rx_clock_to_symbol_freq);
+
+  history = 1500;      // spare input samples in case we need them.
+  
+  d_sssr.reset ();
+  d_interp.reset ();
+  d_next_input = 0;
+  d_rx_clock_to_symbol_freq = nominal_ratio_of_rx_clock_to_symbol_freq;
+}
+
+GrAtscSegSymSyncImpl::~GrAtscSegSymSyncImpl ()
+{
+  // Nop
+}
+
+void
+GrAtscSegSymSyncImpl::pre_initialize ()
+{
+  setSamplingFrequency (
+     getInputSamplingFrequencyN (0) / d_rx_clock_to_symbol_freq);
+}
+
+int
+GrAtscSegSymSyncImpl::forecast (VrSampleRange output,
+                               VrSampleRange inputs[])
+{
+  assert (numberInputs == 1);  // I hate these free references to
+                               // superclass's instance variables...
+
+  inputs[0].index = d_next_input;
+  inputs[0].size =
+    ((long unsigned int) (output.size * d_rx_clock_to_symbol_freq)
+     + history - 1);
+
+  return 0;
+}
+
+int
+GrAtscSegSymSyncImpl::work (VrSampleRange output, void *ao[],
+                           VrSampleRange inputs[], void *ai[])
+{
+#if 0
+  float                *input_samples  = ((float **) ai)[0];
+  float         *output_samples = ((float **) ao)[0];
+  atsc::syminfo *output_info    = ((atsc::syminfo **) ao)[1];
+
+  // FIXME finish...
+#endif
+  assert (0);
+
+  return output.size;
+}
+
+void
+GrAtscSegSymSyncImpl::reset ()
+{
+  d_sssr.reset ();
+  d_interp.reset ();
+}
+
+
+/*
+ * Exported constructor.
+ * Doesn't expose any of the internals or our compile time dependencies.
+ */
+
+GrAtscSegSymSync *
+create_GrAtscSegSymSyncImpl (double nominal_ratio_of_rx_clock_to_symbol_freq)
+{
+  return new GrAtscSegSymSyncImpl (nominal_ratio_of_rx_clock_to_symbol_freq);
+}