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diff --git a/src/codec2_fifo.h b/src/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 *codec2_fifo_create(int nshort);
+struct FIFO *codec2_fifo_create_buf(int nshort, short *buf);
+void codec2_fifo_destroy(struct FIFO *fifo);
+int codec2_fifo_write(struct FIFO *fifo, short data[], int n);
+int codec2_fifo_read(struct FIFO *fifo, short data[], int n);
+
+/* Return the number of bytes stored in the FIFO */
+int codec2_fifo_used(const struct FIFO *const fifo);
+
+/* Return the space available in the FIFO */
+int codec2_fifo_free(const struct FIFO *const fifo);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif