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diff --git a/src/OutputInternal.hxx b/src/OutputInternal.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_OUTPUT_INTERNAL_HXX
+#define MPD_OUTPUT_INTERNAL_HXX
+
+#include "audio_format.h"
+#include "pcm/pcm_buffer.h"
+
+#include <glib.h>
+
+#include <time.h>
+
+class Filter;
+struct config_param;
+
+enum audio_output_command {
+	AO_COMMAND_NONE = 0,
+	AO_COMMAND_ENABLE,
+	AO_COMMAND_DISABLE,
+	AO_COMMAND_OPEN,
+
+	/**
+	 * This command is invoked when the input audio format
+	 * changes.
+	 */
+	AO_COMMAND_REOPEN,
+
+	AO_COMMAND_CLOSE,
+	AO_COMMAND_PAUSE,
+
+	/**
+	 * Drains the internal (hardware) buffers of the device.  This
+	 * operation may take a while to complete.
+	 */
+	AO_COMMAND_DRAIN,
+
+	AO_COMMAND_CANCEL,
+	AO_COMMAND_KILL
+};
+
+struct audio_output {
+	/**
+	 * The device's configured display name.
+	 */
+	const char *name;
+
+	/**
+	 * The plugin which implements this output device.
+	 */
+	const struct audio_output_plugin *plugin;
+
+	/**
+	 * The #mixer object associated with this audio output device.
+	 * May be NULL if none is available, or if software volume is
+	 * configured.
+	 */
+	class Mixer *mixer;
+
+	/**
+	 * Will this output receive tags from the decoder?  The
+	 * default is true, but it may be configured to false to
+	 * suppress sending tags to the output.
+	 */
+	bool tags;
+
+	/**
+	 * Shall this output always play something (i.e. silence),
+	 * even when playback is stopped?
+	 */
+	bool always_on;
+
+	/**
+	 * Has the user enabled this device?
+	 */
+	bool enabled;
+
+	/**
+	 * Is this device actually enabled, i.e. the "enable" method
+	 * has succeeded?
+	 */
+	bool really_enabled;
+
+	/**
+	 * Is the device (already) open and functional?
+	 *
+	 * This attribute may only be modified by the output thread.
+	 * It is protected with #mutex: write accesses inside the
+	 * output thread and read accesses outside of it may only be
+	 * performed while the lock is held.
+	 */
+	bool open;
+
+	/**
+	 * Is the device paused?  i.e. the output thread is in the
+	 * ao_pause() loop.
+	 */
+	bool pause;
+
+	/**
+	 * When this flag is set, the output thread will not do any
+	 * playback.  It will wait until the flag is cleared.
+	 *
+	 * This is used to synchronize the "clear" operation on the
+	 * shared music pipe during the CANCEL command.
+	 */
+	bool allow_play;
+
+	/**
+	 * If not NULL, the device has failed, and this timer is used
+	 * to estimate how long it should stay disabled (unless
+	 * explicitly reopened with "play").
+	 */
+	GTimer *fail_timer;
+
+	/**
+	 * The configured audio format.
+	 */
+	struct audio_format config_audio_format;
+
+	/**
+	 * The audio_format in which audio data is received from the
+	 * player thread (which in turn receives it from the decoder).
+	 */
+	struct audio_format in_audio_format;
+
+	/**
+	 * The audio_format which is really sent to the device.  This
+	 * is basically config_audio_format (if configured) or
+	 * in_audio_format, but may have been modified by
+	 * plugin->open().
+	 */
+	struct audio_format out_audio_format;
+
+	/**
+	 * The buffer used to allocate the cross-fading result.
+	 */
+	struct pcm_buffer cross_fade_buffer;
+
+	/**
+	 * The filter object of this audio output.  This is an
+	 * instance of chain_filter_plugin.
+	 */
+	Filter *filter;
+
+	/**
+	 * The replay_gain_filter_plugin instance of this audio
+	 * output.
+	 */
+	Filter *replay_gain_filter;
+
+	/**
+	 * The serial number of the last replay gain info.  0 means no
+	 * replay gain info was available.
+	 */
+	unsigned replay_gain_serial;
+
+	/**
+	 * The replay_gain_filter_plugin instance of this audio
+	 * output, to be applied to the second chunk during
+	 * cross-fading.
+	 */
+	Filter *other_replay_gain_filter;
+
+	/**
+	 * The serial number of the last replay gain info by the
+	 * "other" chunk during cross-fading.
+	 */
+	unsigned other_replay_gain_serial;
+
+	/**
+	 * The convert_filter_plugin instance of this audio output.
+	 * It is the last item in the filter chain, and is responsible
+	 * for converting the input data into the appropriate format
+	 * for this audio output.
+	 */
+	Filter *convert_filter;
+
+	/**
+	 * The thread handle, or NULL if the output thread isn't
+	 * running.
+	 */
+	GThread *thread;
+
+	/**
+	 * The next command to be performed by the output thread.
+	 */
+	enum audio_output_command command;
+
+	/**
+	 * The music pipe which provides music chunks to be played.
+	 */
+	const struct music_pipe *pipe;
+
+	/**
+	 * This mutex protects #open, #fail_timer, #chunk and
+	 * #chunk_finished.
+	 */
+	GMutex *mutex;
+
+	/**
+	 * This condition object wakes up the output thread after
+	 * #command has been set.
+	 */
+	GCond *cond;
+
+	/**
+	 * The player_control object which "owns" this output.  This
+	 * object is needed to signal command completion.
+	 */
+	struct player_control *player_control;
+
+	/**
+	 * The #music_chunk which is currently being played.  All
+	 * chunks before this one may be returned to the
+	 * #music_buffer, because they are not going to be used by
+	 * this output anymore.
+	 */
+	const struct music_chunk *chunk;
+
+	/**
+	 * Has the output finished playing #chunk?
+	 */
+	bool chunk_finished;
+};
+
+/**
+ * Notify object used by the thread's client, i.e. we will send a
+ * notify signal to this object, expecting the caller to wait on it.
+ */
+extern struct notify audio_output_client_notify;
+
+static inline bool
+audio_output_is_open(const struct audio_output *ao)
+{
+	return ao->open;
+}
+
+static inline bool
+audio_output_command_is_finished(const struct audio_output *ao)
+{
+	return ao->command == AO_COMMAND_NONE;
+}
+
+struct audio_output *
+audio_output_new(const struct config_param *param,
+		 struct player_control *pc,
+		 GError **error_r);
+
+bool
+ao_base_init(struct audio_output *ao,
+	     const struct audio_output_plugin *plugin,
+	     const struct config_param *param, GError **error_r);
+
+void
+ao_base_finish(struct audio_output *ao);
+
+void
+audio_output_free(struct audio_output *ao);
+
+#endif