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diff --git a/gr-vocoder/lib/codec2/codec2_fifo.h b/gr-vocoder/lib/codec2/codec2_fifo.h
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+/*---------------------------------------------------------------------------*\
+
+ FILE........: codec2_fifo.h
+ AUTHOR......: David Rowe
+ DATE CREATED: Oct 15 2012
+
+ A FIFO design useful in gluing the FDMDV modem and codec together in
+ integrated applications.
+
+ The name codec2_fifo.h is used to make it unique when "make
+ installed".
+
+\*---------------------------------------------------------------------------*/
+
+/*
+ Copyright (C) 2012 David Rowe
+
+ All rights reserved.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License version 2.1, as
+ published by the Free Software Foundation. This program 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 Lesser General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __FIFO__
+#define __FIFO__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct FIFO;
+
+struct FIFO *fifo_create(int nshort);
+void fifo_destroy(struct FIFO *fifo);
+int fifo_write(struct FIFO *fifo, short data[], int n);
+int fifo_read(struct FIFO *fifo, short data[], int n);
+int fifo_used(struct FIFO *fifo);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif