scale method
scale video content. 1.0 is no scale. https://github.com/wang-bin/mdk-sdk/wiki/Player-APIs#void-scalefloat-x-float-y-void-vo_opaque--nullptr
Implementation
void scale(double x, double y) => _player.ref.scale.asFunction<
void Function(Pointer<mdkPlayer>, double, double, Pointer<Void>)>()(
_player.ref.object, x, y, Pointer.fromAddress(0));