An apparatus comprising means configured to: receive encoded spatial audio signal directional metadata parameters for time-frequency tiles of an audio frame; receive an indicator configured to identify whether the encoded spatial audio signal directional metadata parameters were encoded based on a quantization resolution which is equal to or less than a determined number of bits; decode the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the quantization resolution which is equal to or less than the determined number of bits when the indicator identifies that the encoded spatial audio signal directional metadata parameters were encoded based on the quantization resolution which is equal to or less than the determined number of bits; and when the indicator identifies that the encoded spatial audio signal directional metadata parameters were not encoded based on the quantization resolution which is equal to or less than the determined number of bits, the means is configured to: decode a first part of the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on a further quantization resolution, the first part comprising entropy encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution; decode, when the difference between the determined number of bits and a number of bits used to encode the first part is less than a number of bits required to encode a second part of the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution, the second part comprising fixed rate encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on a reduced bit quantization resolution, else decode the second part comprising fixed rate encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution. receive encoded spatial audio signal directional metadata parameters for time-frequency tiles of an audio frame; receive an indicator configured to identify whether the encoded spatial audio signal directional metadata parameters were encoded based on a quantization resolution which is equal to or less than a determined number of bits; decode the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the quantization resolution which is equal to or less than the determined number of bits when the indicator identifies that the encoded spatial audio signal directional metadata parameters were encoded based on the quantization resolution which is equal to or less than the determined number of bits; and when the indicator identifies that the encoded spatial audio signal directional metadata parameters were not encoded based on the quantization resolution which is equal to or less than the determined number of bits, the means is configured to: decode a first part of the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on a further quantization resolution, the first part comprising entropy encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution; decode, when the difference between the determined number of bits and a number of bits used to encode the first part is less than a number of bits required to encode a second part of the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution, the second part comprising fixed rate encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on a reduced bit quantization resolution, else decode the second part comprising fixed rate encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution. decode a first part of the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on a further quantization resolution, the first part comprising entropy encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution; decode, when the difference between the determined number of bits and a number of bits used to encode the first part is less than a number of bits required to encode a second part of the encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution, the second part comprising fixed rate encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on a reduced bit quantization resolution, else decode the second part comprising fixed rate encoded spatial audio signal directional metadata parameters for the time-frequency tiles of the audio frame based on the further quantization resolution.