USBVC_STREAM_FID
strm_if->fid = head_flag & USBVC_STREAM_FID;
(head_flag & USBVC_STREAM_FID)) {
strm_if->fid = head_flag & USBVC_STREAM_FID;
} else if (strm_if->fid != (head_flag & USBVC_STREAM_FID)) {
strm_if->fid = head_flag & USBVC_STREAM_FID;