blocks: added gr::blocks::char_to_float

3 files changed, 117 insertions, 0 deletions

diff --git a/gr-blocks/lib/CMakeLists.txt b/gr-blocks/lib/CMakeLists.txt
index 6cdfdd03c..a3bb67e4d 100644
--- a/gr-blocks/lib/CMakeLists.txt
+++ b/gr-blocks/lib/CMakeLists.txt
@@ -118,6 +118,7 @@ link_directories(${Boost_LIBRARY_DIRS})
 list(APPEND gr_blocks_sources
     ${generated_sources}
     add_ff_impl.cc
+    char_to_float_impl.cc
     multiply_cc_impl.cc
     multiply_ff_impl.cc
     multiply_const_cc_impl.cc
diff --git a/gr-blocks/lib/char_to_float_impl.cc b/gr-blocks/lib/char_to_float_impl.cc
new file mode 100644
index 000000000..22c5d2e25
--- /dev/null
+++ b/gr-blocks/lib/char_to_float_impl.cc
@@ -0,0 +1,65 @@
+/* -*- 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_float_impl.h"
+#include <gr_io_signature.h>
+#include <volk/volk.h>
+
+namespace gr {
+  namespace blocks {
+
+    char_to_float::sptr char_to_float::make(size_t vlen, float scale)
+    {
+      return gnuradio::get_initial_sptr(new char_to_float_impl(vlen, scale));
+    }
+
+    char_to_float_impl::char_to_float_impl(size_t vlen, float scale)
+      : gr_sync_block("char_to_float",
+		      gr_make_io_signature (1, -1, sizeof(char)*vlen),
+		      gr_make_io_signature (1,  1, sizeof(float)*vlen)),
+	d_vlen(vlen), d_scale(scale)
+    {
+      const int alignment_multiple =
+	volk_get_alignment() / sizeof(float);
+      set_alignment(std::max(1, alignment_multiple));
+    }
+
+    int
+    char_to_float_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];
+      float *out = (float *) output_items[0];
+
+      // Note: the unaligned benchmarked much faster than the aligned
+      volk_8i_s32f_convert_32f_u(out, in, d_scale, d_vlen*noutput_items);
+      
+      return noutput_items;
+    }
+
+  } /* namespace blocks */
+}/* namespace gr */
diff --git a/gr-blocks/lib/char_to_float_impl.h b/gr-blocks/lib/char_to_float_impl.h
new file mode 100644
index 000000000..620d7e737
--- /dev/null
+++ b/gr-blocks/lib/char_to_float_impl.h
@@ -0,0 +1,51 @@
+/* -*- 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.
+ */
+
+#ifndef INCLUDED_CHAR_TO_FLOAT_IMPL_H
+#define INCLUDED_CHAR_TO_FLOAT_IMPL_H
+
+#include <blocks/char_to_float.h>
+
+namespace gr {
+  namespace blocks {
+
+    class BLOCKS_API char_to_float_impl : public char_to_float
+    {
+      size_t d_vlen;
+      float d_scale;
+
+    public:
+      char_to_float_impl(size_t vlen, float scale);
+
+      virtual float scale() const { return d_scale; }
+      virtual void set_scale(float scale) { d_scale = scale; }
+
+      int work(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+   
+
+#endif /* INCLUDED_CHAR_TO_FLOAT_IMPL_H */