1 files changed, 72 insertions, 0 deletions
diff --git a/gr-blocks/lib/streams_to_stream_impl.cc b/gr-blocks/lib/streams_to_stream_impl.cc
new file mode 100644
index 000000000..09c593e81
--- /dev/null
+++ b/gr-blocks/lib/streams_to_stream_impl.cc
@@ -0,0 +1,72 @@
+/* -*- 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 "streams_to_stream_impl.h"
+#include <gr_io_signature.h>
+
+namespace gr {
+  namespace blocks {
+
+    streams_to_stream::sptr streams_to_stream::make(size_t itemsize, size_t nstreams)
+    {
+      return gnuradio::get_initial_sptr(new streams_to_stream_impl(itemsize, nstreams));
+    }
+
+    streams_to_stream_impl::streams_to_stream_impl(size_t itemsize, size_t nstreams)
+      : gr_sync_interpolator ("streams_to_stream",
+			      gr_make_io_signature (nstreams, nstreams, itemsize),
+			      gr_make_io_signature (1, 1, itemsize),
+			      nstreams)
+    {
+    }
+
+    int
+    streams_to_stream_impl::work(int noutput_items,
+				 gr_vector_const_void_star &input_items,
+				 gr_vector_void_star &output_items)
+    {
+      size_t itemsize = output_signature()->sizeof_stream_item (0);
+      
+      const char **inv = (const char **) &input_items[0];
+      char *out = (char *) output_items[0];
+      int nstreams = input_items.size();
+      
+      assert (noutput_items % nstreams == 0);
+      int ni = noutput_items / nstreams;
+      
+      for (int i = 0; i < ni; i++){
+	for (int j = 0; j < nstreams; j++){
+	  memcpy(out, inv[j], itemsize);
+	  out += itemsize;
+	  inv[j] += itemsize;
+	}
+      }
+      
+      return noutput_items;
+    }
+
+  } /* namespace blocks */
+} /* namespace gr */