10:40 AM PT -- Baltimore PD tells TMZ ... they got a call for disorderly conduct and an assault, but it doesn't sound like any officers actually showed up -- as we're told no police services were needed.
Blueface attacked his girlfriend's father this week -- but it wasn't out of nowhere ... the guy literally swung at his daughter's boyfriend first, and seems to have connected.
TMZ has obtained the video that everyone's been wanting to see as it relates to this scuffle -- actual surveillance footage from Friday evening in Baltimore, which shows Blueface actually deliver the knockdown blow to her Chrisean Rock's dad .