From a54dc5bab6cc38513e9732be9f5c2670145b160f Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Sun, 24 Feb 2013 18:55:04 -0500
Subject: blocks: adding threshold, strech, and throttle to gr-blocks.
---
gr-blocks/lib/stretch_ff_impl.cc | 84 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+)
create mode 100644 gr-blocks/lib/stretch_ff_impl.cc
(limited to 'gr-blocks/lib/stretch_ff_impl.cc')
diff --git a/gr-blocks/lib/stretch_ff_impl.cc b/gr-blocks/lib/stretch_ff_impl.cc
new file mode 100644
index 0000000000..90bbc7ee5a
--- /dev/null
+++ b/gr-blocks/lib/stretch_ff_impl.cc
@@ -0,0 +1,84 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2010,2013 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 "stretch_ff_impl.h"
+#include <gr_io_signature.h>
+
+namespace gr {
+ namespace blocks {
+
+ stretch_ff::sptr
+ stretch_ff::make(float lo, size_t vlen)
+ {
+ return gnuradio::get_initial_sptr
+ (new stretch_ff_impl(lo, vlen));
+ }
+
+ stretch_ff_impl::stretch_ff_impl(float lo, size_t vlen)
+ : gr_sync_block("stretch_ff",
+ gr_make_io_signature(1, 1, vlen * sizeof(float)),
+ gr_make_io_signature(1, 1, vlen * sizeof(float))),
+ d_lo(lo), d_vlen(vlen)
+ {
+ }
+
+ stretch_ff_impl::~stretch_ff_impl()
+ {
+ }
+
+ int
+ stretch_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 count = 0; count < noutput_items; count++) {
+ float vmax = in[0] - d_lo;
+
+ for(unsigned int i = 1; i < d_vlen; i++) {
+ float vtmp = in[i] - d_lo;
+ if(vtmp > vmax)
+ vmax = vtmp;
+ }
+
+ if(vmax != 0.0)
+ for(unsigned int i = 0; i < d_vlen; i++)
+ out[i] = d_lo * (1.0 - (in[i] - d_lo) / vmax);
+ else
+ for(unsigned int i = 0; i < d_vlen; i++)
+ out[i] = in[i];
+
+ in += d_vlen;
+ out += d_vlen;
+ }
+
+ return noutput_items;
+ }
+
+ } /* namespace blocks */
+} /* namespace gr */
--
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