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diff --git a/src/decoder/decoder_api.h b/src/decoder/decoder_api.h
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+/*
+ * Copyright (C) 2003-2011 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
+ * \brief The MPD Decoder API
+ *
+ * This is the public API which is used by decoder plugins to
+ * communicate with the mpd core.
+ */
+
+#ifndef MPD_DECODER_API_H
+#define MPD_DECODER_API_H
+
+#include "check.h"
+#include "decoder_command.h"
+#include "decoder_plugin.h"
+#include "input_stream.h"
+#include "replay_gain_info.h"
+#include "tag.h"
+#include "audio_format.h"
+#include "conf.h"
+
+#include <libavutil/frame.h>
+
+#include <stdbool.h>
+
+/**
+ * Notify the player thread that it has finished initialization and
+ * that it has read the song's meta data.
+ *
+ * @param decoder the decoder object
+ * @param audio_format the audio format which is going to be sent to
+ * decoder_data()
+ * @param seekable true if the song is seekable
+ * @param total_time the total number of seconds in this song; -1 if unknown
+ */
+void
+decoder_initialized(struct decoder *decoder,
+            const struct audio_format *audio_format,
+            bool seekable, float total_time);
+
+/**
+ * Determines the pending decoder command.
+ *
+ * @param decoder the decoder object
+ * @return the current command, or DECODE_COMMAND_NONE if there is no
+ * command pending
+ */
+enum decoder_command
+decoder_get_command(struct decoder *decoder);
+
+/**
+ * Called by the decoder when it has performed the requested command
+ * (dc->command).  This function resets dc->command and wakes up the
+ * player thread.
+ *
+ * @param decoder the decoder object
+ */
+void
+decoder_command_finished(struct decoder *decoder);
+
+/**
+ * Call this when you have received the DECODE_COMMAND_SEEK command.
+ *
+ * @param decoder the decoder object
+ * @return the destination position for the week
+ */
+double
+decoder_seek_where(struct decoder *decoder);
+
+/**
+ * Call this instead of decoder_command_finished() when seeking has
+ * failed.
+ *
+ * @param decoder the decoder object
+ */
+void
+decoder_seek_error(struct decoder *decoder);
+
+/**
+ * Blocking read from the input stream.
+ *
+ * @param decoder the decoder object
+ * @param is the input stream to read from
+ * @param buffer the destination buffer
+ * @param length the maximum number of bytes to read
+ * @return the number of bytes read, or 0 if one of the following
+ * occurs: end of file; error; command (like SEEK or STOP).
+ */
+size_t
+decoder_read(struct decoder *decoder, struct input_stream *is,
+         void *buffer, size_t length);
+
+/**
+ * Sets the time stamp for the next data chunk [seconds].  The MPD
+ * core automatically counts it up, and a decoder plugin only needs to
+ * use this function if it thinks that adding to the time stamp based
+ * on the buffer size won't work.
+ */
+void
+decoder_timestamp(struct decoder *decoder, double t);
+
+/**
+ * This function is called by the decoder plugin when it has
+ * successfully decoded block of input data.
+ *
+ * @param decoder the decoder object
+ * @param is an input stream which is buffering while we are waiting
+ * for the player
+ * @param data the source buffer
+ * @param length the number of bytes in the buffer
+ * @return the current command, or DECODE_COMMAND_NONE if there is no
+ * command pending
+ */
+enum decoder_command decoder_data(struct decoder *decoder, struct input_stream *is,
+                                  AVFrame *frame, uint16_t kbit_rate);
+
+/**
+ * This function is called by the decoder plugin when it has
+ * successfully decoded a tag.
+ *
+ * @param decoder the decoder object
+ * @param is an input stream which is buffering while we are waiting
+ * for the player
+ * @param tag the tag to send
+ * @return the current command, or DECODE_COMMAND_NONE if there is no
+ * command pending
+ */
+enum decoder_command
+decoder_tag(struct decoder *decoder, struct input_stream *is,
+        const struct tag *tag);
+
+/**
+ * Set replay gain values for the following chunks.
+ *
+ * @param decoder the decoder object
+ * @param rgi the replay_gain_info object; may be NULL to invalidate
+ * the previous replay gain values
+ * @return the replay gain adjustment used
+ */
+float
+decoder_replay_gain(struct decoder *decoder,
+            const struct replay_gain_info *replay_gain_info);
+
+/**
+ * Store MixRamp tags.
+ *
+ * @param decoder the decoder object
+ * @param replay_gain_db the ReplayGain adjustment used for this song
+ * @param mixramp_start the mixramp_start tag; may be NULL to invalidate
+ * @param mixramp_end the mixramp_end tag; may be NULL to invalidate
+ */
+void
+decoder_mixramp(struct decoder *decoder, float replay_gain_db,
+        char *mixramp_start, char *mixramp_end);
+
+#endif