Also, please don't put more than one C statement on the same line.
Do you mean code like this:
`case WG_WMV_VIDEO_FORMAT_WMV1: wmv_format = "WMV1"; break;` ?
If do, I just follow the parttern in wg_format_to_caps_video_h264(). Should I put `wmv_format = "WMV1";` and `break;` into new lines?