Added Extract CSI block.

This block takes PDU messages as input, looks for a "csi" entry in the meta dictionary, and if found outputs a complex CSI vector on a stream output. The meta is also sent along as stream tags.

include/ieee802_11/extract_csi.h

@@ -0,0 +1,41 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2021 Anton Ottosson.
+ *
+ * This 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.
+ *
+ * This software 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 this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_IEEE802_11_EXTRACT_CSI_H
+#define INCLUDED_IEEE802_11_EXTRACT_CSI_H
+
+#include <ieee802_11/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr {
+  namespace ieee802_11 {
+
+    class IEEE802_11_API extract_csi : virtual public gr::sync_block
+    {
+     public:
+      typedef boost::shared_ptr<extract_csi> sptr;
+      static sptr make();
+    };
+
+  } // namespace ieee802_11
+} // namespace gr
+
+#endif /* INCLUDED_IEEE802_11_EXTRACT_CSI_H */
+