blocks: added gr::blocks::char_to_float

9 files changed, 278 insertions, 0 deletions

diff --git a/gr-blocks/grc/blocks_block_tree.xml b/gr-blocks/grc/blocks_block_tree.xml
index b1680497b..ae540d3b1 100644
--- a/gr-blocks/grc/blocks_block_tree.xml
+++ b/gr-blocks/grc/blocks_block_tree.xml
@@ -37,4 +37,9 @@
 		<block>blocks_multiply_const_vxx</block>
 		<block>blocks_sub_xx</block>
 	</cat>
+	<cat>
+	        <name>Type Conversions</name>
+		<block>blocks_char_to_float</block>
+	</cat>
+	
 </cat>
diff --git a/gr-blocks/grc/blocks_char_to_float.xml b/gr-blocks/grc/blocks_char_to_float.xml
new file mode 100644
index 000000000..5d367d719
--- /dev/null
+++ b/gr-blocks/grc/blocks_char_to_float.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0"?>
+<!--
+###################################################
+##Char to Float:
+###################################################
+ -->
+<block>
+	<name>Char To Float</name>
+	<key>blocks_char_to_float</key>
+	<import>from gnuradio import blocks</import>
+	<make>blocks.char_to_float($vlen, $scale)</make>
+	<callback>set_scale($scale)</callback>
+	<param>
+		<name>Vec Length</name>
+		<key>vlen</key>
+		<value>1</value>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Scale</name>
+		<key>scale</key>
+		<value>1</value>
+		<type>real</type>
+	</param>
+	<sink>
+		<name>in</name>
+		<type>byte</type>
+		<vlen>$vlen</vlen>
+	</sink>
+	<source>
+		<name>out</name>
+		<type>float</type>
+		<vlen>$vlen</vlen>
+	</source>
+</block>
diff --git a/gr-blocks/include/blocks/CMakeLists.txt b/gr-blocks/include/blocks/CMakeLists.txt
index c54e10fac..bfdde9701 100644
--- a/gr-blocks/include/blocks/CMakeLists.txt
+++ b/gr-blocks/include/blocks/CMakeLists.txt
@@ -84,6 +84,7 @@ install(FILES
     ${generated_includes}
     api.h
     add_ff.h
+    char_to_float.h
     multiply_cc.h
     multiply_ff.h
     multiply_const_cc.h
diff --git a/gr-blocks/include/blocks/char_to_float.h b/gr-blocks/include/blocks/char_to_float.h
new file mode 100644
index 000000000..92a2dbf80
--- /dev/null
+++ b/gr-blocks/include/blocks/char_to_float.h
@@ -0,0 +1,62 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2012 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_BLOCKS_CHAR_TO_FLOAT_H
+#define INCLUDED_BLOCKS_CHAR_TO_FLOAT_H
+
+#include <blocks/api.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief Convert stream of chars to a stream of float
+     * \ingroup converter_blk
+     *
+     * \param vlen vector length of data streams.
+     * \param scale a scalar divider to change the output signal scale.
+     */
+    class BLOCKS_API char_to_float : virtual public gr_sync_block
+    {
+    public:
+      
+      // gr::blocks::char_to_float_ff::sptr
+      typedef boost::shared_ptr<char_to_float> sptr;
+
+      static sptr make(size_t vlen=1, float scale=1.0);
+
+      /*!
+       * Get the scalar divider value.
+       */
+      virtual float scale() const = 0;
+
+      /*!
+       * Set the scalar divider value.
+       */
+      virtual void set_scale(float scale) = 0;
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_BLOCKS_CHAR_TO_FLOAT_H */
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 */
diff --git a/gr-blocks/python/qa_type_conversions.py b/gr-blocks/python/qa_type_conversions.py
new file mode 100755
index 000000000..bc65a2781
--- /dev/null
+++ b/gr-blocks/python/qa_type_conversions.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+#
+# 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.
+#
+
+from gnuradio import gr, gr_unittest
+import blocks_swig
+
+class test_type_conversions(gr_unittest.TestCase):
+
+    def setUp(self):
+        self.tb = gr.top_block()
+
+    def tearDown(self):
+        self.tb = None
+
+    def test_char_to_float_identity(self):
+        src_data = (1, 2, 3, 4, 5)
+        expected_data = (1.0, 2.0, 3.0, 4.0, 5.0)
+        src = gr.vector_source_b(src_data)
+        op = blocks_swig.char_to_float()
+        dst = gr.vector_sink_f()
+        self.tb.connect(src, op, dst)
+        self.tb.run()
+        self.assertFloatTuplesAlmostEqual(expected_data, dst.data())
+
+    def test_char_to_float_scale(self):
+        src_data = (1, 2, 3, 4, 5)
+        expected_data = (0.5, 1.0, 1.5, 2.0, 2.5)
+        src = gr.vector_source_b(src_data)
+        op = blocks_swig.char_to_float(scale=2.0)
+        dst = gr.vector_sink_f()
+        self.tb.connect(src, op, dst)
+        self.tb.run()
+        self.assertFloatTuplesAlmostEqual(expected_data, dst.data())
+
+if __name__ == '__main__':
+    gr_unittest.run(test_type_conversions, "test_type_conversions.xml")
diff --git a/gr-blocks/swig/blocks_swig.i b/gr-blocks/swig/blocks_swig.i
index b0be1ae0d..6eb10a688 100644
--- a/gr-blocks/swig/blocks_swig.i
+++ b/gr-blocks/swig/blocks_swig.i
@@ -40,6 +40,7 @@
 #include "blocks/add_const_vss.h"
 #include "blocks/add_const_vii.h"
 #include "blocks/add_const_vcc.h"
+#include "blocks/char_to_float.h"
 #include "blocks/divide_ff.h"
 #include "blocks/divide_ss.h"
 #include "blocks/divide_ii.h"
@@ -74,6 +75,7 @@
 %include "blocks/add_const_vss.h"
 %include "blocks/add_const_vii.h"
 %include "blocks/add_const_vcc.h"
+%include "blocks/char_to_float.h"
 %include "blocks/divide_ff.h"
 %include "blocks/divide_ss.h"
 %include "blocks/divide_ii.h"
@@ -107,6 +109,7 @@ GR_SWIG_BLOCK_MAGIC2(blocks, add_const_vff);
 GR_SWIG_BLOCK_MAGIC2(blocks, add_const_vss);
 GR_SWIG_BLOCK_MAGIC2(blocks, add_const_vii);
 GR_SWIG_BLOCK_MAGIC2(blocks, add_const_vcc);
+GR_SWIG_BLOCK_MAGIC2(blocks, char_to_float);
 GR_SWIG_BLOCK_MAGIC2(blocks, divide_ff);
 GR_SWIG_BLOCK_MAGIC2(blocks, divide_ss);
 GR_SWIG_BLOCK_MAGIC2(blocks, divide_ii);