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diff --git a/src/decoder/flac_common.h b/src/decoder/flac_common.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.
+ */
+
+/*
+ * Common data structures and functions used by FLAC and OggFLAC
+ */
+
+#ifndef MPD_FLAC_COMMON_H
+#define MPD_FLAC_COMMON_H
+
+#include "decoder_api.h"
+#include "pcm_buffer.h"
+
+#include <FLAC/stream_decoder.h>
+#include <FLAC/metadata.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "flac"
+
+struct flac_data {
+	struct pcm_buffer buffer;
+
+	/**
+	 * The size of one frame in the output buffer.
+	 */
+	unsigned frame_size;
+
+	/**
+	 * Has decoder_initialized() been called yet?
+	 */
+	bool initialized;
+
+	/**
+	 * Does the FLAC file contain an unsupported audio format?
+	 */
+	bool unsupported;
+
+	/**
+	 * The validated audio format of the FLAC file.  This
+	 * attribute is defined if "initialized" is true.
+	 */
+	struct audio_format audio_format;
+
+	/**
+	 * The total number of frames in this song.  The decoder
+	 * plugin may initialize this attribute to override the value
+	 * provided by libFLAC (e.g. for sub songs from a CUE sheet).
+	 */
+	FLAC__uint64 total_frames;
+
+	/**
+	 * The number of the first frame in this song.  This is only
+	 * non-zero if playing sub songs from a CUE sheet.
+	 */
+	FLAC__uint64 first_frame;
+
+	/**
+	 * The number of the next frame which is going to be decoded.
+	 */
+	FLAC__uint64 next_frame;
+
+	FLAC__uint64 position;
+	struct decoder *decoder;
+	struct input_stream *input_stream;
+	struct tag *tag;
+};
+
+/* initializes a given FlacData struct */
+void
+flac_data_init(struct flac_data *data, struct decoder * decoder,
+	       struct input_stream *input_stream);
+
+void
+flac_data_deinit(struct flac_data *data);
+
+void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
+			     struct flac_data *data);
+
+void flac_error_common_cb(FLAC__StreamDecoderErrorStatus status,
+			  struct flac_data *data);
+
+FLAC__StreamDecoderWriteStatus
+flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
+		  const FLAC__int32 *const buf[],
+		  FLAC__uint64 nbytes);
+
+#endif /* _FLAC_COMMON_H */