1 files changed, 83 insertions, 0 deletions
diff --git a/gr-blocks/lib/plateau_detector_fb_impl.cc b/gr-blocks/lib/plateau_detector_fb_impl.cc
new file mode 100644
index 0000000000..f68ef6463f
--- /dev/null
+++ b/gr-blocks/lib/plateau_detector_fb_impl.cc
@@ -0,0 +1,83 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2012-2013 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 <gr_io_signature.h>
+#include "plateau_detector_fb_impl.h"
+
+namespace gr {
+  namespace blocks {
+
+    plateau_detector_fb::sptr
+    plateau_detector_fb::make(int max_len, float threshold)
+    {
+      return gnuradio::get_initial_sptr
+        (new plateau_detector_fb_impl(max_len, threshold));
+    }
+
+    plateau_detector_fb_impl::plateau_detector_fb_impl(int max_len, float threshold)
+      : gr_sync_block("plateau_detector_fb",
+                      gr_make_io_signature(1, 1, sizeof(float)),
+                      gr_make_io_signature(1, 1, sizeof(char))),
+	d_max_len(max_len),
+	d_threshold(threshold)
+    {}
+
+    plateau_detector_fb_impl::~plateau_detector_fb_impl()
+    {
+    }
+
+    int
+    plateau_detector_fb_impl::work(int noutput_items,
+                                   gr_vector_const_void_star &input_items,
+                                   gr_vector_void_star &output_items)
+    {
+      const float *in = (const float *) input_items[0];
+      unsigned char *out = (unsigned char *) output_items[0];
+      int flank_start;
+
+      memset((void *) out, 0x00, noutput_items);
+      int i;
+      for(i = 0; i < noutput_items; i++) {
+        if(in[i] >= d_threshold) {
+          if(noutput_items-i < 2*d_max_len) { // If we can't finish, come back later
+            break;
+          }
+          flank_start = i;
+          while(i < noutput_items && in[i] >= d_threshold)
+            i++;
+          if((i - flank_start) > 1) { // 1 Sample is not a plateau
+            out[flank_start + (i-flank_start)/2] = 1;
+            i = std::min(i+d_max_len, noutput_items-1);
+          }
+        }
+      }
+
+      return i;
+    }
+
+  } /* namespace blocks */
+} /* namespace gr */
+