Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element
AssigneeDolby International AB
InventorsLars Villemoes, Heiko Purnhagen, Per Ekstrand
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Abstract
Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.
Claims9
An audio processing device comprising:
- a bitstream payload deformatter configured to demultiplex a block of an encoded audio bitstream;
- a decoding subsystem coupled to the bitstream payload deformatter and configured to decode at least a portion of the block of the encoded audio bitstream, wherein the block of the encoded audio bitstream includes:
- a fill element with an identifier indicating a start of the fill element and fill data after the identifier, wherein the fill data includes:
- at least one flag identifying whether enhanced spectral band replication processing is to be performed on audio content of the block of the encoded audio bitstream, and
- enhanced spectral band replication metadata which does not include one or more parameters used for both spectral patching and harmonic transposition, wherein the enhanced spectral band replication metadata is metadata configured to enable at least one eSBR tool which is described or mentioned in the MPEG USAC standard and which is not described or mentioned in the MPEG-4 AAC standard,
- wherein the enhanced spectral band replication metadata includes a parameter indicating whether to perform signal adaptive frequency domain oversampling, and the decoding subsystem is further configured to perform signal adaptive frequency domain oversampling if the parameter indicates that signal adaptive frequency domain oversampling is to be performed.
A method for decoding an encoded audio bitstream, the method comprising:
- demultiplexing a block of the encoded audio bitstream;
- decoding at least a portion of the block of the encoded audio bitstream,
- wherein the block of the encoded audio bitstream includes:
- a fill element with an identifier indicating a start of the fill element and fill data after the identifier, wherein the fill data includes:
- a flag identifying whether enhanced spectral band replication processing is to be performed on audio content of the block of the encoded audio bitstream, and
- enhanced spectral band replication metadata which does not include one or more parameters used for both spectral patching and harmonic transposition, wherein the enhanced spectral band replication metadata is metadata configured to enable at least one eSBR tool which is described or mentioned in the MPEG USAC standard and which is not described or mentioned in the MPEG-4 AAC standard;
- and
- wherein the enhanced spectral band replication metadata includes a parameter indicating whether to perform signal adaptive frequency domain oversampling, and the decoding subsystem is further configured to perform signal adaptive frequency domain oversampling if the parameter indicates that signal adaptive frequency domain oversampling is to be performed.
Dependencies are inferred from the claim text.