packetizer: mpegaudio: implement draining and proper discontinuity handling
packetizer: mpegaudio: implement draining and proper discontinuity handling

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc