THD_CH_MODIFIER_SURROUNDEX  444 libavcodec/mlpdec.c             mh.channel_modifier_thd_stream2 == THD_CH_MODIFIER_SURROUNDEX)
THD_CH_MODIFIER_SURROUNDEX  450 libavcodec/mlpdec.c             mh.channel_modifier_thd_stream1 == THD_CH_MODIFIER_SURROUNDEX)