1. A method for encoding audio data, comprising: detecting for the audio data a Higher-Order Ambisonics (HOA) format; transforming the HOA format based on an inverse Discrete Spherical Harmonics Transform (iDSHT) to a common HOA format; encoding coefficients of the common HOA format, and auxiliary data that indicate at least metadata about virtual or real loudspeaker positions and mixing information about the audio data, the mixing information comprising details of the HOA format.