README change

1 files changed, 69 insertions, 0 deletions

diff --git a/gr-blocks/lib/char_to_short_impl.cc b/gr-blocks/lib/char_to_short_impl.cc
new file mode 100644
index 000000000..a86a928b5
--- /dev/null
+++ b/gr-blocks/lib/char_to_short_impl.cc
@@ -0,0 +1,69 @@
+/* -*- 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 "char_to_short_impl.h"
+#include <gr_io_signature.h>
+#include <volk/volk.h>
+
+namespace gr {
+  namespace blocks {
+
+    char_to_short::sptr char_to_short::make(size_t vlen)
+    {
+      return gnuradio::get_initial_sptr(new char_to_short_impl(vlen));
+    }
+
+    char_to_short_impl::char_to_short_impl(size_t vlen)
+      : gr_sync_block("char_to_short",
+		      gr_make_io_signature (1, -1, sizeof(char)*vlen),
+		      gr_make_io_signature (1,  1, sizeof(short)*vlen)),
+	d_vlen(vlen)
+    {
+      const int alignment_multiple =
+	volk_get_alignment() / sizeof(short);
+      set_alignment(std::max(1, alignment_multiple));
+    }
+
+    int
+    char_to_short_impl::work(int noutput_items,
+			     gr_vector_const_void_star &input_items,
+			     gr_vector_void_star &output_items)
+    {
+      const int8_t *in = (const int8_t *) input_items[0];
+      int16_t *out = (int16_t *) output_items[0];
+
+      if(is_unaligned()) {
+	volk_8i_convert_16i_u(out, in, d_vlen*noutput_items);
+      }
+      else {
+	volk_8i_convert_16i_a(out, in, d_vlen*noutput_items);
+      }
+
+      return noutput_items;
+    }
+
+  } /* namespace blocks */
+}/* namespace gr */