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diff --git a/include/asterisk/smoother.h b/include/asterisk/smoother.h
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+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2005, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ * \brief Asterisk internal frame definitions.
+ * \arg For an explanation of frames, see \ref Def_Frame
+ * \arg Frames are send of Asterisk channels, see \ref Def_Channel
+ */
+
+#ifndef _ASTERISK_SMOOTHER_H
+#define _ASTERISK_SMOOTHER_H
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#include "asterisk/endian.h"
+
+#define AST_SMOOTHER_FLAG_G729		(1 << 0)
+#define AST_SMOOTHER_FLAG_BE		(1 << 1)
+
+/*! \name AST_Smoother
+*/
+/*@{ */
+/*! \page ast_smooth The AST Frame Smoother
+The ast_smoother interface was designed specifically
+to take frames of variant sizes and produce frames of a single expected
+size, precisely what you want to do.
+
+The basic interface is:
+
+- Initialize with ast_smoother_new()
+- Queue input frames with ast_smoother_feed()
+- Get output frames with ast_smoother_read()
+- when you're done, free the structure with ast_smoother_free()
+- Also see ast_smoother_test_flag(), ast_smoother_set_flags(), ast_smoother_get_flags(), ast_smoother_reset()
+*/
+struct ast_smoother;
+
+struct ast_frame;
+
+struct ast_smoother *ast_smoother_new(int bytes);
+void ast_smoother_set_flags(struct ast_smoother *smoother, int flags);
+int ast_smoother_get_flags(struct ast_smoother *smoother);
+int ast_smoother_test_flag(struct ast_smoother *s, int flag);
+void ast_smoother_free(struct ast_smoother *s);
+void ast_smoother_reset(struct ast_smoother *s, int bytes);
+
+/*!
+ * \brief Reconfigure an existing smoother to output a different number of bytes per frame
+ * \param s the smoother to reconfigure
+ * \param bytes the desired number of bytes per output frame
+ * \return nothing
+ *
+ */
+void ast_smoother_reconfigure(struct ast_smoother *s, int bytes);
+
+int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap);
+struct ast_frame *ast_smoother_read(struct ast_smoother *s);
+#define ast_smoother_feed(s,f) __ast_smoother_feed(s, f, 0)
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define ast_smoother_feed_be(s,f) __ast_smoother_feed(s, f, 1)
+#define ast_smoother_feed_le(s,f) __ast_smoother_feed(s, f, 0)
+#else
+#define ast_smoother_feed_be(s,f) __ast_smoother_feed(s, f, 0)
+#define ast_smoother_feed_le(s,f) __ast_smoother_feed(s, f, 1)
+#endif
+/*@} Doxygen marker */
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}
+#endif
+
+#endif /* _ASTERISK_SMOOTHER_H */