rotate method
rotate video content around the center. degree
can be 0, 90, 180, 270 in counterclockwise.
https://github.com/wang-bin/mdk-sdk/wiki/Player-APIs#void-rotateint-degree-void-vo_opaque--nullptr
Implementation
void rotate(int degree) => _player.ref.rotate
.asFunction<void Function(Pointer<mdkPlayer>, int, Pointer<Void>)>()(
_player.ref.object, degree, Pointer.fromAddress(0));