Binaural audio processing

An apparatus for generating a bitstream, the apparatus comprising:

• a binaural circuit (601) for providing a plurality of binaural rendering data sets, each binaural rendering data set comprising data representing parameters for a virtual position binaural rendering processing and providing a different representation of the same underlying head related binaural transfer function,
• a representation circuit (603) for providing, for each of the binaural rendering data sets, a representation indication indicative of a representation for the binaural rendering data set;
• and
• an output circuit (605) for generating a bitstream comprising the binaural rendering data sets and the representation indications,
• wherein at least some representations for the binaural rendering data sets correspond to different binaural audio processing algorithms.

A method of processing audio, the method comprising:

• receiving input data, the input data comprising a plurality of binaural rendering data sets, each binaural rendering data set comprising data representing parameters for a virtual position binaural rendering processing and providing a different representation of the same underlying head related binaural transfer function, the input data further, for each of the binaural rendering data sets, comprising a representation indication indicative of a representation for the binaural rendering data set;
• selecting a selected binaural rendering data set in response to the representation indications and a capability of the apparatus;
• and
• processing an audio signal in response to data of the selected binaural rendering data set,
• wherein at least some representations for the binaural rendering data sets correspond to different binaural audio processing algorithms, and the selection of the selected binaural rendering data set is dependent on a binaural processing algorithm used by the audio processor (707).

A method of generating a bitstream, the method comprising:

• providing a plurality of binaural rendering data sets, each binaural rendering data set comprising data representing parameters for a virtual position binaural rendering processing and providing a different representation of the same underlying head related binaural transfer function,
• providing, for each of the binaural rendering data sets, a representation indication indicative of a representation for the binaural rendering data set;
• generating a bitstream comprising the binaural rendering data sets and the representation indication,
• wherein at least some representations for the binaural rendering data sets correspond to different binaural audio processing algorithms.

A bitstream comprising:

• a plurality of binaural rendering data sets, each binaural rendering data set comprising data representing parameters of at least one binaural virtual position rendering processing and providing a different representation of the same underlying head related binaural transfer function;
• and
• a representation indication for each of the binaural rendering data sets, the representation indication for a binaural rendering data set being indicative of a representation used by the binaural rendering data set,
• wherein at least some representations for the binaural rendering data sets correspond to different binaural audio processing algorithms.