How to set filter for directories in qfiledialog

I would like to know is there any way to select only some directories and some files at a time using QFileDialog class. Here I set filesfilter but I also need to set folder filter. I have folders whic

QFileDialog filter from mime-types

I want the filter in a QFileDialog to match all audio file types supported by Phonon on the platform in question.

海滨之歌歌词？