/**
* Check if a media file is new or changed.
* A file is considered existing and unchanged only when:
* - its hash (ID) can be found in the database, and
* - its last modified time is the same with that of the comparing file.
*
* @param SplFileInfo $file
*
* @return bool
*/
protected function isNewOrChanged(SplFileInfo $file)
{
return !Song::whereIdAndMtime($this->getHash($file->getPathname()), $file->getMTime())->count();
}