An empty entry in a table means 'Not Applicable'. For instance, no temporary buffer is needed for a specific configuration.

'X' means configuration is not supported.

All returned lengths are in real numbers. The number of input samples is the transform length.

Several functions are available in the C and Python API to compute the buffer sizes at runtime.

CFFT

CFFT of length N

CFFT Temporary Buffer Size

CFFT Output Buffer Size

CIFFT Output Buffer Size

RFFT

RFFT of length N

RFFT/RIFFT Temporary Buffer Size

Apply to both RFFT and RIFFT

RFFT Output Buffer Size

RIFFT Input Buffer Size

MFCC (CFFT based)

MFCC of length N

MFCC Temporary Buffer Size 1

MFCC Temporary Buffer Size 2

MFCC (RFFT based)

MFCC of length N

MFCC Temporary Buffer Size 1

MFCC Temporary Buffer Size 2