117 lines
4.2 KiB
C++
117 lines
4.2 KiB
C++
/* This file is part of Clementine.
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Copyright 2014, David Sansome <me@davidsansome.com>
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Copyright 2021, Lukas Prediger <lumip@lumip.de>
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Clementine is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Clementine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Clementine. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CDDASONGLOADER_H
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#define CDDASONGLOADER_H
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#include <QFuture>
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#include <QObject>
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#include <QUrl>
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// These must come after Qt includes (issue 3247)
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#include <gst/audio/gstaudiocdsrc.h>
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#include <atomic>
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#include "core/song.h"
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#include "musicbrainz/musicbrainzclient.h"
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// This class provides a (hopefully) nice, high level interface to get CD
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// information and load tracks
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class CddaSongLoader : public QObject {
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Q_OBJECT
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public:
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CddaSongLoader(
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// Url of the CD device. Will use the default device if empty
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const QUrl& url = QUrl(), QObject* parent = nullptr);
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~CddaSongLoader();
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// Load songs.
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// Signals declared below will be emitted anytime new information becomes
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// available.
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void LoadSongs();
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bool IsActive() const;
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// The list of currently cached tracks. This gets updated when
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// LoadSongs() is called.
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SongList cached_tracks() const;
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signals:
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// Emitted whenever information about tracks were updated.
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// Guarantees consistency with previous updates, i.e., consumers can rely
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// entirely on the updated list and do not have to merge metadata. May be
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// emitted multiple times during reading the disc as long as the Finished
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// signal was not emitted.
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void SongsUpdated(const SongList& songs);
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// Emitted when no further updates will follow; guaranteed to be emitted
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// at some point.
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void Finished();
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// The following signals are mostly for internal processing; other classes
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// can get all relevant updates by just connecting to SongsUpdated. However,
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// the more specialised remain available.
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// Emitted when the number of tracks has been initially loaded from the disc.
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// This is a specialised signal; subscribe to SongsUpdated for general updates
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// information about tracks is updated.
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void SongsLoaded(const SongList& songs);
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// Emitted when track durations have been loaded from the disc.
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// This is a specialised signal; subscribe to SongsUpdated for general updates
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// information about tracks is updated.
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void SongsDurationLoaded(const SongList& songs);
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// Emitted when metadata has been loaded from the disc.
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// This is a specialised signal; subscribe to SongsUpdated for general updates
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// information about tracks is updated.
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void SongsMetadataLoaded(const SongList& songs);
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// Emitted when the MusicBrainz disc id has been determined.
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// This is a specialised signal; subscribe to SongsUpdated for general updates
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// information about tracks is updated.
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void MusicBrainzDiscIdLoaded(const QString& musicbrainz_discid);
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private slots:
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void LoadAudioCDTags(const QString& musicbrainz_discid) const;
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void ProcessMusicBrainzResponse(const QString& artist, const QString& album,
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const MusicBrainzClient::ResultList& results);
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void SetDiscTracks(const SongList& songs, bool has_titles);
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private:
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QUrl GetUrlFromTrack(int track_number) const;
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void LoadSongsFromCdda();
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// Parse gstreamer taglist for a song
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// Returns true if any tags were read, updates the Song object in songs
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// accordingly, and returns the zero-based track index via the track_no
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// argument.
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bool ParseSongTags(SongList& songs, GstTagList* tags, gint* track_no);
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struct Disc {
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SongList tracks;
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bool has_titles; // indicates that titles have been read and are not
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// defaulted
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};
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QUrl url_;
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GstElement* cdda_;
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QFuture<void> loading_future_;
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std::atomic<bool> may_load_;
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Disc disc_;
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mutable QMutex disc_mutex_;
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};
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#endif // CDDASONGLOADER_H
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