Johnny Depp: Coke and Booze Fueled Recent Violence ... Amber Claims

Johnny Depp may have a credibility problem if Amber Heard's violence claims make their way to court ... because if she's right, his memory of events will be highly questionable, thanks to coke and liquor.

Sources connected to Amber tell us she's outraged Johnny is calling her a liar over the domestic violence allegations ... because he's almost always high.

Amber claims Johnny was "barely ever sober" during the 15 months they were married. She says he was perpetually high, except when he was shooting a movie, when he hired a chef and a trainer and got sober. Once the movie wrapped, it was back to drugs and alcohol.

Amber claimed in her legal docs he is "often paranoid and his temper is exceptionally scary for me." She goes on ... "Johnny's paranoia, delusions and aggression increased throughout our relationship. So has my awareness of his continued substance abuse."

She claims on both occasions where she has accused him of domestic violence, he was "inebriated and high."