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/**
* Copyright (C) 2018 Michael Pyne <mpyne@kde.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, see <http://www.gnu.org/licenses/>.
*/
#include "directoryloader.h"
#include <QFileInfo>
#include <QMutex>
#include <QMutexLocker>
#include "mediafiles.h"
#include "collectionlist.h"
// Classifies files into types for potential loading purposes.
enum class MediaFileType {
UnusableFile,
MediaFile,
Playlist,
Directory
};
static MediaFileType classifyFile(const QFileInfo &fileInfo);
static FileHandle loadMediaFile(const QString &fileName);
DirectoryLoader::DirectoryLoader(const QString &dir, QObject *parent)
: QObject(parent)
, m_dirIterator(
dir,
QDir::AllEntries | QDir::NoDotAndDotDot,
QDirIterator::Subdirectories | QDirIterator::FollowSymlinks)
{
}
void DirectoryLoader::startLoading()
{
static const int BATCH_SIZE = 256;
FileHandleList files;
while(m_dirIterator.hasNext()) {
const auto fileName = m_dirIterator.next();
const QFileInfo fileInfo(fileName);
const auto type = classifyFile(fileInfo);
switch(type) {
case MediaFileType::Playlist:
emit loadedPlaylist(fileName);
break;
case MediaFileType::MediaFile:
{
const auto loadedMetadata = loadMediaFile(fileInfo.canonicalFilePath());
files << loadedMetadata;
if(files.count() >= BATCH_SIZE) {
emit loadedFiles(files);
files.clear();
}
}
break;
case MediaFileType::Directory:
// this should be impossible based on the
// QDirIterator settings
continue;
case MediaFileType::UnusableFile:
continue;
default:
continue;
}
}
if(!files.isEmpty()) {
emit loadedFiles(files);
}
}
MediaFileType classifyFile(const QFileInfo &fileInfo)
{
const QString path = fileInfo.canonicalFilePath();
if(fileInfo.isFile() && fileInfo.isReadable() &&
MediaFiles::isMediaFile(path))
{
return MediaFileType::MediaFile;
}
// These are all the files we care about, anything remaining needs to be a
// directory or playlist or it must be unusable
if(MediaFiles::isPlaylistFile(path)) {
return MediaFileType::Playlist;
}
if(fileInfo.isDir()) {
return MediaFileType::Directory;
}
return MediaFileType::UnusableFile;
}
FileHandle loadMediaFile(const QString &fileName)
{
// Just because our GUI thread accesses are serialized by signal/slot magic
// doesn't mean that our non-GUI threads don't require deconfliction
// Neither FileHandle nor TagLib are not thread-safe so synchronize access
// to this function.
static QMutex fhLock;
QMutexLocker locker(&fhLock);
const auto item = CollectionList::instance()->lookup(fileName);
if(item) {
// Don't re-load a file if it's already loaded once
return FileHandle(item->file());
}
else {
FileHandle loadedMetadata(fileName);
(void) loadedMetadata.tag(); // Ensure tag is read
return loadedMetadata;
}
}
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