__csid_get_format
format = __csid_get_format(csid, sd_state, i, fmt->which);
*fmt = *__csid_get_format(csid, sd_state,
sink_fmt = __csid_get_format(csid, sd_state,
format = __csid_get_format(csid, sd_state, fmt->pad, fmt->which);
format = __csid_get_format(csid, sd_state, fmt->pad, fmt->which);