Reproduction apparatus, data processing system, reproduction method, program, and storage medium

A reproduction apparatus successively decoding and reproducing a plurality of picture data forming reproduced data, comprising a reproduction memory, a decoder decoding the picture data, writing the decoding results in the reproduction memory, and reproducing and outputting the decoding results read from the reproduction memory, and a processing circuit for performing decoding scheduling for determining an order of making the decoder decode picture data belonging to a group of picture data in units of groups of picture data comprised of a predetermined plurality of the picture data, generating scheduling result data including decoding order data indicating the determined order and validity data indicating validity of the picture data, selecting the picture data to be processed in the order determined by the decoding scheduling based on the scheduling result data, and, conditional on the selected picture data being valid, making the decoder decode and reproduce and output the picture data and, when receiving a reproduction rate change command, updating the validity data of the scheduling result data in accordance with the changed reproduction rate.