The mixed radix FFT can be configured using TP_API to use IO buffer ports (0) or streams (1).
When configured for streams, additional kernels are added on input and output to convert from streams to iobuffers and vice versa, since internally the kernel performing the FFT itself uses IO buffers.
When configured to use streams, 2 streams are used. Even samples are to be supplied on the first stream input and odd samples are to be supplied on the second input. In a similar fashion, even samples out appear on the first port out and odd samples out on the second port out.