We will pass a non-NULL format here only if we want to handle stream change notify returned by wg_transform_read_data(). See: https://gitlab.winehq.org/wine/wine/-/blob/master/dlls/winegstreamer/wg_tran....
H264 decoder handles it, and passes a non-NULL format. See: https://gitlab.winehq.org/wine/wine/-/blob/master/dlls/winegstreamer/h264_de...
Right, but will we ever pass a non-NULL format for DMO objects?