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/*
* Copyright 2003-2020 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_SONG_HXX
#define MPD_SONG_HXX
#include "Ptr.hxx"
#include "Chrono.hxx"
#include "tag/Tag.hxx"
#include "pcm/AudioFormat.hxx"
#include "util/Compiler.h"
#include "config.h"
#include <boost/intrusive/list.hpp>
#include <string>
struct StringView;
struct LightSong;
struct Directory;
class DetachedSong;
class Storage;
class ArchiveFile;
/**
* A song file inside the configured music directory. Internal
* #SimpleDatabase class.
*/
struct Song {
static constexpr auto link_mode = boost::intrusive::normal_link;
typedef boost::intrusive::link_mode<link_mode> LinkMode;
typedef boost::intrusive::list_member_hook<LinkMode> Hook;
/**
* Pointers to the siblings of this directory within the
* parent directory. It is unused (undefined) if this song is
* not in the database.
*
* This attribute is protected with the global #db_mutex.
* Read access in the update thread does not need protection.
*/
Hook siblings;
Tag tag;
/**
* The #Directory that contains this song.
*/
Directory &parent;
/**
* The time stamp of the last file modification. A negative
* value means that this is unknown/unavailable.
*/
std::chrono::system_clock::time_point mtime =
std::chrono::system_clock::time_point::min();
/**
* Start of this sub-song within the file.
*/
SongTime start_time = SongTime::zero();
/**
* End of this sub-song within the file.
* Unused if zero.
*/
SongTime end_time = SongTime::zero();
/**
* The audio format of the song, if given by the decoder
* plugin. May be undefined if unknown.
*/
AudioFormat audio_format = AudioFormat::Undefined();
/**
* The file name.
*/
std::string filename;
/**
* If non-empty, then this object does not describe a file
* within the `music_directory`, but some sort of symbolic
* link pointing to this value. It can be an absolute URI
* (i.e. with URI scheme) or a URI relative to this object
* (which may begin with one or more "../").
*/
std::string target;
template<typename F>
Song(F &&_filename, Directory &_parent) noexcept
:parent(_parent), filename(std::forward<F>(_filename)) {}
Song(DetachedSong &&other, Directory &_parent) noexcept;
gcc_pure
const char *GetFilenameSuffix() const noexcept;
/**
* Checks whether the decoder plugin for this song is
* available.
*/
gcc_pure
bool IsPluginAvailable() const noexcept;
/**
* allocate a new song structure with a local file name and attempt to
* load its metadata. If all decoder plugin fail to read its meta
* data, nullptr is returned.
*
* Throws on error.
*
* @return the song on success, nullptr if the file was not
* recognized
*/
static SongPtr LoadFile(Storage &storage, const char *name_utf8,
Directory &parent);
/**
* Throws on error.
*
* @return true on success, false if the file was not recognized
*/
bool UpdateFile(Storage &storage);
#ifdef ENABLE_ARCHIVE
static SongPtr LoadFromArchive(ArchiveFile &archive,
const char *name_utf8,
Directory &parent) noexcept;
bool UpdateFileInArchive(ArchiveFile &archive) noexcept;
#endif
/**
* Returns the URI of the song in UTF-8 encoding, including its
* location within the music directory.
*/
gcc_pure
std::string GetURI() const noexcept;
gcc_pure
LightSong Export() const noexcept;
};
typedef boost::intrusive::list<Song,
boost::intrusive::member_hook<Song, Song::Hook,
&Song::siblings>,
boost::intrusive::constant_time_size<false>> SongList;
#endif
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