1 files changed, 144 insertions, 0 deletions
diff --git a/gr-fec/lib/repetition_decoder_impl.cc b/gr-fec/lib/repetition_decoder_impl.cc
new file mode 100644
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+++ b/gr-fec/lib/repetition_decoder_impl.cc
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+/* -*- c++ -*- */
+/*
+ * Copyright 2014 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 "repetition_decoder_impl.h"
+#include <math.h>
+#include <boost/assign/list_of.hpp>
+#include <volk/volk.h>
+#include <sstream>
+#include <stdio.h>
+#include <vector>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      generic_decoder::sptr
+      repetition_decoder::make(int frame_size, int rep,
+                               float ap_prob)
+      {
+        return generic_decoder::sptr
+          (new repetition_decoder_impl(frame_size, rep,
+                                       ap_prob));
+      }
+
+      repetition_decoder_impl::repetition_decoder_impl(int frame_size, int rep,
+                                                       float ap_prob)
+        : generic_decoder("repetition_decoder")
+      {
+        // Set max frame size here; all buffers and settings will be
+        // based on this value.
+        d_max_frame_size = frame_size;
+        set_frame_size(frame_size);
+
+        if(rep < 0)
+          throw std::runtime_error("repetition_encoder: repetition rate must be >= 0");
+        if((ap_prob < 0) || (ap_prob > 1.0))
+          throw std::runtime_error("repetition_encoder: a priori probability rate must be in [0, 1]");
+
+        d_rep = rep;
+        d_ap_prob = ap_prob;
+        d_trials.resize(d_rep);
+      }
+
+      repetition_decoder_impl::~repetition_decoder_impl()
+      {
+      }
+
+      int
+      repetition_decoder_impl::get_output_size()
+      {
+        //unpacked bits
+        return d_frame_size;
+      }
+
+      int
+      repetition_decoder_impl::get_input_size()
+      {
+        return d_frame_size*d_rep;
+      }
+
+      int
+      repetition_decoder_impl::get_input_item_size()
+      {
+        return sizeof(float);
+      }
+
+      const char*
+      repetition_decoder_impl::get_input_conversion()
+      {
+        return "none";
+      }
+
+      float
+      repetition_decoder_impl::get_shift()
+      {
+        return 0;
+      }
+
+      bool
+      repetition_decoder_impl::set_frame_size(unsigned int frame_size)
+      {
+        bool ret = true;
+        if(frame_size > d_max_frame_size) {
+          GR_LOG_INFO(d_logger, boost::format("tried to set frame to %1%; max possible is %2%") \
+                      % frame_size % d_max_frame_size);
+          frame_size = d_max_frame_size;
+          ret = false;
+        }
+
+        d_frame_size = frame_size;
+
+        return ret;
+      }
+
+      double
+      repetition_decoder_impl::rate()
+      {
+        return 1.0/static_cast<double>(d_rep);
+      }
+
+      void
+      repetition_decoder_impl::generic_work(void *inbuffer, void *outbuffer)
+      {
+        const float *in = (const float*)inbuffer;
+        unsigned char *out = (unsigned char *) outbuffer;
+
+        for(unsigned int i = 0; i < d_frame_size; i++) {
+          for(unsigned int r = 0; r < d_rep; r++) {
+            d_trials[r] = (in[d_rep*i + r] > 0) ? 1.0f : 0.0f;
+          }
+          float res = std::count(d_trials.begin(), d_trials.end(), 1.0f);
+          if((res / static_cast<float>(d_rep)) > d_ap_prob)
+            out[i] = 1;
+          else
+            out[i] = 0;
+        }
+      }
+
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */