unsafe extern "C" fn set_caps<T: GLFilterImpl>(
ptr: *mut GstGLFilter,
incaps: *mut GstCaps,
outcaps: *mut GstCaps,
) -> gboolean
unsafe extern "C" fn set_caps<T: GLFilterImpl>(
ptr: *mut GstGLFilter,
incaps: *mut GstCaps,
outcaps: *mut GstCaps,
) -> gboolean