Module transform 

Fast Fourier Transform (FFT), Real FFT (RFFT), Discrete Cosine Transform (DCT-IV), and Bit Reversal functions.

Functions

bit_reversal

Bit reversal function for interleaved complex array of size 2 * n.

cfft_f32

In-place Complex FFT for floating point 32-bit (f32). data is interleaved complex array of size 2 * n ([re0, im0, re1, im1, ...]). ifft_flag: 0 for forward FFT, 1 for inverse FFT (IFFT). bit_reverse_flag: 1 to enable bit reversal, 0 to disable.

cfft_q15

In-place Complex FFT for Q15 fixed-point.

cfft_q31

In-place Complex FFT for Q31 fixed-point.

dct4_f32

Discrete Cosine Transform Type IV (DCT-IV) for f32.

rfft_f32

Real FFT for floating point 32-bit (f32). src has n real samples. dst receives 2 * n complex outputs.

rfft_q15

Real FFT for Q15 fixed-point.

rfft_q31

Real FFT for Q31 fixed-point.