Apparatus method and computer program for encoding, decoding, scene processing and other procedures related to DirAC based spatial audio coding

An apparatus for generating a sound field description from an input signal comprising at least two channels comprises: an input signal analyzer (600) for obtaining direction data and diffuseness data from the input signal; an estimator (620) for estimating a first energy- or amplitude-related measure for an omnidirectional component derived from the input signal and for estimating a second energy- or amplitude-related measure for a directional component derived from the input signal, and a sound component generator (750) for generating sound field components of the sound field, wherein the sound component generator is configured to perform an energy compensation of the directional component using the first energy- or amplitude-related measure, the second energy- or amplitude-related measure, the direction data and the diffuseness data.