DecoderInternal.hxx 2.97 KB
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/*
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 * Copyright (C) 2003-2013 The Music Player Daemon Project
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 * http://www.musicpd.org
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 *
 * 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.
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 *
 * 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.
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 */

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#ifndef MPD_DECODER_INTERNAL_HXX
#define MPD_DECODER_INTERNAL_HXX
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#include "decoder_command.h"
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#include "pcm_convert.h"
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#include "replay_gain_info.h"
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struct input_stream;

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struct decoder {
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	struct decoder_control *dc;

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	struct pcm_convert_state conv_state;
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	/**
	 * The time stamp of the next data chunk, in seconds.
	 */
	double timestamp;

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	/**
	 * 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;

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	/**
	 * This flag is set by decoder_seek_where(), and checked by
	 * decoder_command_finished().  It is used to clean up after
	 * seeking.
	 */
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	bool seeking;
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	/**
	 * 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.
	 */
	struct tag *song_tag;

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	/** the last tag received from the stream */
	struct tag *stream_tag;

	/** the last tag received from the decoder plugin */
	struct tag *decoder_tag;
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	/** the chunk currently being written to */
	struct music_chunk *chunk;
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	struct replay_gain_info replay_gain_info;

	/**
	 * A positive serial number for checking if replay gain info
	 * has changed since the last check.
	 */
	unsigned replay_gain_serial;
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	decoder(decoder_control *_dc, bool _initial_seek_pending,
		struct tag *_tag)
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		:dc(_dc),
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		 timestamp(0),
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		 initial_seek_pending(_initial_seek_pending),
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		 initial_seek_running(false),
		 seeking(false),
		 song_tag(_tag), stream_tag(nullptr), decoder_tag(nullptr),
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		 chunk(nullptr),
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		 replay_gain_serial(0) {
		pcm_convert_init(&conv_state);
	}

	~decoder();
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};

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/**
 * Returns the current chunk the decoder writes to, or allocates a new
 * chunk if there is none.
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 *
 * @return the chunk, or NULL if we have received a decoder command
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 */
struct music_chunk *
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decoder_get_chunk(struct decoder *decoder);
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/**
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 * Flushes the current chunk.
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 */
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void
decoder_flush_chunk(struct decoder *decoder);
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#endif