AV_CH_LAYOUT_5POINT0

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C) @nogc nothrow
enum AV_CH_LAYOUT_5POINT0 = AV_CH_LAYOUT_SURROUND | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT;

Meta