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OMX's allow 3rds party to define extensions using their own enums (like OMX_VIDEO_CODINGEXTTYPE) and to be used as the general ones (like OMX_VIDEO_CODINGTYPE). Properly cast those to fix -Wenum-conversion warnings from some compilers such as clang. https://bugzilla.gnome.org/show_bug.cgi?id=789057
cc0e3c83