unsafe extern "C" fn base_transform_prepare_output_buffer<T: BaseTransformImpl>(
ptr: *mut GstBaseTransform,
inbuf: *mut GstBuffer,
outbuf: *mut GstBuffer,
) -> GstFlowReturn
unsafe extern "C" fn base_transform_prepare_output_buffer<T: BaseTransformImpl>(
ptr: *mut GstBaseTransform,
inbuf: *mut GstBuffer,
outbuf: *mut GstBuffer,
) -> GstFlowReturn