The co-pilot of AirAsia Flight QZ8501 was flying the passenger jet when it crashed last month, officials have said.
It was last week reported that the plane was climbing at a speed "beyond normal" before stalling.
Recovery efforts are still underway following the crash, which left all 162 on board dead.
Divers have retrieved the crashed AirAsia plane's second black box from the bottom of the Java Sea, giving investigators the essential tools they need to start piecing together what brought Flight 8501 down.
Reuters say the report said that the cockpit voice recorder was on board an Indonesian navy vessel and expected to be sent to the capital, Jakarta, for analysis.
The Airbus A320-200 airliner lost contact with air traffic control in bad weather on 28 December, less than halfway into a two-hour flight from Indonesia's second-biggest city of Surabaya to Singapore.
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