Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element

Abstract

Embodiments relate to an audio processing unit (210) that includes a bitstream payload deformatter (215) and a decoding subsystem (202). The decoding subsystem (202) is coupled to the bitstream payload deformatter (215) and configured to decode at least a portion of a block of an encoded audio bitstream. The block includes a fill element with an identifier indicating a start of the fill element and fill data after the identifier. The fill data includes at least one flag identifying whether a base form of spectral band replication or an enhanced form of spectral band replication is to be performed on audio content of the block. The identifier is a three bit unsigned integer transmitted most significant bit first and having a value of 0x6.