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VCU II library Complex FFT

hello all
I have one question concerning VCU-II lib for C28x processors.
This lib contains struct _CFFT_Obj_ which has fields
 int16_t *pInBuffer;
int16_t *pOutBuffer;
But I thought that complex FFT returns  some array of complex digits.
So What is   the meaning  int16_t type of this  output buffer?
Can somebody explain me?