Apply frequency shift to input audio samples.

The filter accepts the following options:

shift

Specify frequency shift. Allowed range is -INT_MAX to INT_MAX. Default value is 0.0.

level

Set output gain applied to final output. Allowed range is from 0.0 to 1.0. Default value is 1.0.

order

Set filter order used for filtering. Allowed range is from 1 to 16. Default value is 8.