Body-worn cameras will be delivered to every frontline police officer in South Australia, with the State Government to spend nearly $6 million over four years on the devices.

The Government will commit $5.9 million in the 2015-16 SA budget to the cameras, and will also spend $7.4 million to put 680 removable "rugged" tablets in patrol cars.

Deputy commissioner Linda Williams said vision of police interactions with the public gave them better evidence for prosecution.

"We've seen them being used overseas in a couple of different jurisdictions," she said.

"They've been well-received by the police officers themselves.

"We've had trials with them here. It's very easy and quick for police officers to use, and the evidence capturing is fantastic."

SA Council for Civil Liberties spokesman George Mancini said it was yet another aspect of surveillance.

He said police should be required to tell people when they were being recorded and they should have access to the video.

"There may be no limitations on when the cameras are on and who they're filming," Mr Mancini said.

Police Association of SA president Mark Carroll said there was nothing new about the cameras, which he said had been used for many years across many jurisdictions.

"We want to find out about the capture of this data," he said.

"How will it be stored? How long will it be stored for? And what cost will come for SAPOL to do that."

Police Minister Tony Piccolo said the total SAPOL budget will rise to nearly $850 million in 2015-16, in "its highest ever funding allocation".

The full 2015-16 SA budget will be released on Thursday.