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/*
* Copyright 2003-2016 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
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