Patent ID: 7844355

Claim:
A stream playback device for playing back an audio stream including audio frames which are each made up of base data and extension data, the base data being for obtaining audio data with a predetermined quality, the extension data being for improving the quality of the audio data obtained by using the base data, comprising: a decoder; and an interface unit operable to receive the audio stream supplied from a stream supply device, wherein the stream playback device has a function of (i) notifying the stream supply device whether the base data is usable and whether the extension data is usable in decoding of the audio stream by the decoder, through the interface unit, and (ii) (a) in a case where the notification indicates that the extension data is usable, receiving the audio stream including the extension data supplied through the interface unit, without being decoded by the stream supply device, and (b) in a case where the notification indicates that the extension data is not usable and the stream supply device is able to decode the extension data, receiving data obtained by decoding the audio stream including the extension data by the stream supply device, supplied through the interface unit.