1 files changed, 74 insertions, 0 deletions
diff --git a/gr-digital/lib/digital_bytes_to_syms.cc b/gr-digital/lib/digital_bytes_to_syms.cc
new file mode 100644
index 000000000..f8bd82d5b
--- /dev/null
+++ b/gr-digital/lib/digital_bytes_to_syms.cc
@@ -0,0 +1,74 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010,2012 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 <digital_bytes_to_syms.h>
+#include <gr_io_signature.h>
+#include <assert.h>
+
+static const int BITS_PER_BYTE = 8;
+
+digital_bytes_to_syms_sptr
+digital_make_bytes_to_syms ()
+{
+  return gnuradio::get_initial_sptr(new digital_bytes_to_syms ());
+}
+
+digital_bytes_to_syms::digital_bytes_to_syms ()
+  : gr_sync_interpolator ("bytes_to_syms",
+			  gr_make_io_signature (1, 1, sizeof (unsigned char)),
+			  gr_make_io_signature (1, 1, sizeof (float)),
+			  BITS_PER_BYTE)
+{
+}
+
+int
+digital_bytes_to_syms::work (int noutput_items,
+			     gr_vector_const_void_star &input_items,
+			     gr_vector_void_star &output_items)
+{
+  const unsigned char *in = (unsigned char *) input_items[0];
+  float *out = (float *) output_items[0];
+  
+  assert (noutput_items % BITS_PER_BYTE == 0);
+  
+  for (int i = 0; i < noutput_items / BITS_PER_BYTE; i++) {
+    int x = in[i];
+
+    *out++ = (((x >> 7) & 0x1) << 1) - 1;
+    *out++ = (((x >> 6) & 0x1) << 1) - 1;
+    *out++ = (((x >> 5) & 0x1) << 1) - 1;
+    *out++ = (((x >> 4) & 0x1) << 1) - 1;
+    *out++ = (((x >> 3) & 0x1) << 1) - 1;
+    *out++ = (((x >> 2) & 0x1) << 1) - 1;
+    *out++ = (((x >> 1) & 0x1) << 1) - 1;
+    *out++ = (((x >> 0) & 0x1) << 1) - 1;
+  }
+
+  return noutput_items;
+}
+
+
+