The NSW laws are the same as above. Actually they are the Australian Road rules. So unless a state has change the rule specifically then this is Australia wide. If it is showing movies, they can book you for that if it is in view of the drivers or drives in other cars. If it is showing music or GPS you should be fine.

Edit: Found it. Link to the PDF file. It is in the Australian road rules, part 18 (Miscellaneous road rules) Para 299.