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-rw-r--r--gr-blocks/lib/nlog10_ff_impl.cc64
1 files changed, 64 insertions, 0 deletions
diff --git a/gr-blocks/lib/nlog10_ff_impl.cc b/gr-blocks/lib/nlog10_ff_impl.cc
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+++ b/gr-blocks/lib/nlog10_ff_impl.cc
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+/* -*- c++ -*- */
+/*
+ * Copyright 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 "nlog10_ff_impl.h"
+#include <gr_io_signature.h>
+
+namespace gr {
+ namespace blocks {
+
+ nlog10_ff::sptr nlog10_ff::make(float n, size_t vlen, float k)
+ {
+ return gnuradio::get_initial_sptr(new nlog10_ff_impl(n, vlen, k));
+ }
+
+ nlog10_ff_impl::nlog10_ff_impl(float n, size_t vlen, float k)
+ : gr_sync_block("nlog10_ff",
+ gr_make_io_signature (1, 1, sizeof(float)*vlen),
+ gr_make_io_signature (1, 1, sizeof(float)*vlen)),
+ d_n(n), d_vlen(vlen), d_k(k)
+ {
+ }
+
+ int
+ nlog10_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];
+ int noi = noutput_items * d_vlen;
+ float n = d_n;
+ float k = d_k;
+
+ for (int i = 0; i < noi; i++)
+ out[i] = n * log10(std::max(in[i], (float) 1e-18)) + k;
+
+ return noutput_items;
+ }
+
+ } /* namespace blocks */
+}/* namespace gr */