AV_CH_LAYOUT_7POINT1_WIDE_BACK

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
@nogc nothrow extern (C)
enum AV_CH_LAYOUT_7POINT1_WIDE_BACK = (AV_CH_LAYOUT_5POINT1_BACK | AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER);

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