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diff --git a/src/pcm_pack.h b/src/pcm_pack.h
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+++ b/src/pcm_pack.h
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+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/** \file
+ *
+ * Library for working with packed 24 bit samples.
+ */
+
+#ifndef PCM_PACK_H
+#define PCM_PACK_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+/**
+ * Converts padded 24 bit samples (4 bytes per sample) to packed 24
+ * bit samples (3 bytes per sample).
+ *
+ * This function can be used to convert a buffer in-place.
+ *
+ * @param dest the destination buffer (array of triples)
+ * @param src the source buffer
+ * @param num_samples the number of samples to convert
+ * @param reverse_endian is src and dest in non-host byte order?
+ */
+void
+pcm_pack_24(uint8_t *dest, const int32_t *src, unsigned num_samples,
+	    bool reverse_endian);
+
+/**
+ * Converts packed 24 bit samples (3 bytes per sample) to padded 24
+ * bit samples (4 bytes per sample).
+ *
+ * @param dest the destination buffer
+ * @param src the source buffer (array of triples)
+ * @param num_samples the number of samples to convert
+ * @param reverse_endian is src and dest in non-host byte order?
+ */
+void
+pcm_unpack_24(int32_t *dest, const uint8_t *src, unsigned num_samples,
+	      bool reverse_endian);
+
+#endif