Original commit message from CVS:
* ext/theora/theoradec.c: (theora_dec_src_query),
(theora_dec_sink_event):
* ext/theora/theoraenc.c: (theora_enc_sink_event),
(theora_enc_change_state):
* ext/vorbis/vorbisenc.c: (gst_vorbisenc_init),
(gst_vorbisenc_sink_event), (gst_vorbisenc_change_state):
Take proper locks when handling events.