3 files changed, 149 insertions, 0 deletions
diff --git a/gr-analog/lib/CMakeLists.txt b/gr-analog/lib/CMakeLists.txt
index 9a620133a..f912649d9 100644
--- a/gr-analog/lib/CMakeLists.txt
+++ b/gr-analog/lib/CMakeLists.txt
@@ -128,6 +128,7 @@ list(APPEND analog_sources
     probe_avg_mag_sqrd_f_impl.cc
     pwr_squelch_cc_impl.cc
     pwr_squelch_ff_impl.cc
+    rail_ff_impl.cc
     simple_squelch_cc_impl.cc
 )
 
diff --git a/gr-analog/lib/rail_ff_impl.cc b/gr-analog/lib/rail_ff_impl.cc
new file mode 100644
index 000000000..106c6353a
--- /dev/null
+++ b/gr-analog/lib/rail_ff_impl.cc
@@ -0,0 +1,91 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010,2012 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 "rail_ff_impl.h"
+#include <gr_io_signature.h>
+#include <gr_math.h>
+
+namespace gr {
+  namespace analog {
+    
+    rail_ff::sptr
+    rail_ff::make(float lo, float hi)
+    {
+      return gnuradio::get_initial_sptr
+	(new rail_ff_impl(lo, hi));
+    }
+
+    rail_ff_impl::rail_ff_impl(float lo, float hi)
+      : gr_sync_block("rail_ff",
+		      gr_make_io_signature(1, 1, sizeof(float)),
+		      gr_make_io_signature(1, 1, sizeof(float))),
+	d_lo(lo), d_hi(hi)
+    {
+      set_clipping();
+    }
+
+    rail_ff_impl::~rail_ff_impl()
+    {
+    }
+
+    void
+    rail_ff_impl::set_lo(float lo)
+    {
+      d_lo = lo;
+      set_clipping();
+    }
+    
+    void
+    rail_ff_impl::set_hi(float hi)
+    {
+      d_hi = hi;
+      set_clipping();
+    }
+
+    void
+    rail_ff_impl::set_clipping()
+    {
+      d_mid = (d_lo + d_hi)/2;
+      d_clip = d_hi - d_mid;
+    }
+
+    int
+    rail_ff_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];
+      float *out = (float*)output_items[0];
+
+      for(int i = 0; i < noutput_items; i++) {
+	out[i] = d_mid + gr_branchless_clip(in[i] - d_mid, d_clip);
+      }
+
+      return noutput_items;
+    }
+
+  } /* namespace analog */
+} /* namespace gr */
diff --git a/gr-analog/lib/rail_ff_impl.h b/gr-analog/lib/rail_ff_impl.h
new file mode 100644
index 000000000..436b10b41
--- /dev/null
+++ b/gr-analog/lib/rail_ff_impl.h
@@ -0,0 +1,57 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2012 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.
+ */
+
+#ifndef INCLUDED_ANALOG_RAIL_FF_IMPL_H
+#define INCLUDED_ANALOG_RAIL_FF_IMPL_H
+
+#include <analog/rail_ff.h>
+
+namespace gr {
+  namespace analog {
+    
+    class rail_ff_impl : public rail_ff
+    {
+    private:
+      float d_lo, d_hi;
+      float d_mid, d_clip;
+
+      void set_clipping();
+
+    public:
+      rail_ff_impl(float lo, float hi);
+      ~rail_ff_impl();
+
+      float lo() const { return d_lo; }
+      float hi() const { return d_hi; }
+
+      void set_lo(float lo);
+      void set_hi(float hi);
+
+      int work(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace analog */
+} /* namespace gr */
+
+#endif /* INCLUDED_ANALOG_RAIL_FF_IMPL_H */