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+/*
+ * Copyright (C) 2003-2014 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_DECODER_INTERNAL_HXX
+#define MPD_DECODER_INTERNAL_HXX
+
+#include "ReplayGainInfo.hxx"
+#include "util/Error.hxx"
+
+class PcmConvert;
+struct MusicChunk;
+struct DecoderControl;
+struct Tag;
+
+struct Decoder {
+ DecoderControl &dc;
+
+ /**
+ * For converting input data to the configured audio format.
+ * nullptr means no conversion necessary.
+ */
+ PcmConvert *convert;
+
+ /**
+ * The time stamp of the next data chunk, in seconds.
+ */
+ double timestamp;
+
+ /**
+ * Is the initial seek (to the start position of the sub-song)
+ * pending, or has it been performed already?
+ */
+ bool initial_seek_pending;
+
+ /**
+ * Is the initial seek currently running? During this time,
+ * the decoder command is SEEK. This flag is set by
+ * decoder_get_virtual_command(), when the virtual SEEK
+ * command is generated for the first time.
+ */
+ bool initial_seek_running;
+
+ /**
+ * This flag is set by decoder_seek_time(), and checked by
+ * decoder_command_finished(). It is used to clean up after
+ * seeking.
+ */
+ bool seeking;
+
+ /**
+ * The tag from the song object. This is only used for local
+ * files, because we expect the stream server to send us a new
+ * tag each time we play it.
+ */
+ Tag *song_tag;
+
+ /** the last tag received from the stream */
+ Tag *stream_tag;
+
+ /** the last tag received from the decoder plugin */
+ Tag *decoder_tag;
+
+ /** the chunk currently being written to */
+ MusicChunk *chunk;
+
+ ReplayGainInfo replay_gain_info;
+
+ /**
+ * A positive serial number for checking if replay gain info
+ * has changed since the last check.
+ */
+ unsigned replay_gain_serial;
+
+ /**
+ * An error has occurred (in DecoderAPI.cxx), and the plugin
+ * will be asked to stop.
+ */
+ Error error;
+
+ Decoder(DecoderControl &_dc, bool _initial_seek_pending, Tag *_tag)
+ :dc(_dc),
+ convert(nullptr),
+ timestamp(0),
+ initial_seek_pending(_initial_seek_pending),
+ initial_seek_running(false),
+ seeking(false),
+ song_tag(_tag), stream_tag(nullptr), decoder_tag(nullptr),
+ chunk(nullptr),
+ replay_gain_serial(0) {
+ }
+
+ ~Decoder();
+
+ /**
+ * Returns the current chunk the decoder writes to, or allocates a new
+ * chunk if there is none.
+ *
+ * @return the chunk, or NULL if we have received a decoder command
+ */
+ MusicChunk *GetChunk();
+
+ /**
+ * Flushes the current chunk.
+ *
+ * Caller must not lock the #DecoderControl object.
+ */
+ void FlushChunk();
+};
+
+#endif