带PyQT4和声子的交叉衰落音频

def music_play(self):
    self.delayedInit()
    self.m_media.setCurrentSource(Phonon.MediaSource(self.playlist[self.playlist_pos]))
    self.m_media.play()

def music_stop(self):
    self.m_media.stop()

def delayedInit(self):
    if not self.m_media:
        self.m_media = Phonon.MediaObject(self)
        audioOutput = Phonon.AudioOutput(Phonon.MusicCategory, self)
        Phonon.createPath(self.m_media, audioOutput)

def enqueueNextSource(self):
    if len(self.playlist) >= self.playlist_pos+1:
        self.playlist_pos += 1
        self.m_media.enqueue(Phonon.MediaSource(self.playlist[self.playlist_pos]))
    else:
        self.m_media.stop()