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diff --git a/src/CrossFade.hxx b/src/CrossFade.hxx
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+++ b/src/CrossFade.hxx
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+/*
+ * Copyright (C) 2003-2013 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.
+ */
+
+#ifndef MPD_CROSSFADE_HXX
+#define MPD_CROSSFADE_HXX
+
+struct audio_format;
+struct music_chunk;
+
+/**
+ * Calculate how many music pipe chunks should be used for crossfading.
+ *
+ * @param duration the requested crossfade duration
+ * @param total_time total_time the duration of the new song
+ * @param mixramp_db the current mixramp_db setting
+ * @param mixramp_delay the current mixramp_delay setting
+ * @param replay_gain_db the ReplayGain adjustment used for this song
+ * @param replay_gain_prev_db the ReplayGain adjustment used on the last song
+ * @param mixramp_start the next songs mixramp_start tag
+ * @param mixramp_prev_end the last songs mixramp_end setting
+ * @param af the audio format of the new song
+ * @param old_format the audio format of the current song
+ * @param max_chunks the maximum number of chunks
+ * @return the number of chunks for crossfading, or 0 if cross fading
+ * should be disabled for this song change
+ */
+unsigned cross_fade_calc(float duration, float total_time,
+			 float mixramp_db, float mixramp_delay,
+			 float replay_gain_db, float replay_gain_prev_db,
+			 char *mixramp_start, char *mixramp_prev_end,
+			 const struct audio_format *af,
+			 const struct audio_format *old_format,
+			 unsigned max_chunks);
+
+#endif