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diff --git a/src/PlayerThread.hxx b/src/PlayerThread.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.
+ */
+
+/* \file
+ *
+ * The player thread controls the playback.  It acts as a bridge
+ * between the decoder thread and the output thread(s): it receives
+ * #music_chunk objects from the decoder, optionally mixes them
+ * (cross-fading), applies software volume, and sends them to the
+ * audio outputs via audio_output_all_play().
+ *
+ * It is controlled by the main thread (the playlist code), see
+ * player_control.h.  The playlist enqueues new songs into the player
+ * thread and sends it commands.
+ *
+ * The player thread itself does not do any I/O.  It synchronizes with
+ * other threads via #GMutex and #GCond objects, and passes
+ * #music_chunk instances around in #music_pipe objects.
+ */
+
+#ifndef MPD_PLAYER_THREAD_HXX
+#define MPD_PLAYER_THREAD_HXX
+
+struct player_control;
+
+void
+player_create(struct player_control *pc);
+
+#endif