1 files changed, 61 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/general/gr_delay.h b/gnuradio-core/src/lib/general/gr_delay.h
new file mode 100644
index 000000000..ed05c47f4
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_delay.h
@@ -0,0 +1,61 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2012 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_GR_DELAY_H
+#define INCLUDED_GR_DELAY_H
+
+#include <gr_core_api.h>
+#include <gr_block.h>
+#include <gruel/thread.h>
+
+class gr_delay;
+typedef boost::shared_ptr<gr_delay> gr_delay_sptr;
+
+GR_CORE_API gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
+
+/*!
+ * \brief delay the input by a certain number of samples
+ * \ingroup misc_blk
+ */
+class GR_CORE_API gr_delay : public gr_block
+{
+  friend GR_CORE_API gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
+
+  gr_delay (size_t itemsize, int delay);
+
+  void forecast (int noutput_items, gr_vector_int &ninput_items_required);
+
+  size_t d_itemsize;
+  int d_delta;
+  gruel::mutex d_mutex_delay;
+
+ public:
+  int delay () const { return history()-1; }
+  void set_delay (int delay);
+
+  int general_work (int noutput_items,
+		    gr_vector_int &ninput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items);
+};
+
+#endif