csky_dct4_instance_q31 Struct Reference

Instance structure for the Q31 DCT4/IDCT4 function.

Data Fields
uint16_t	N
uint16_t	Nby2
q31_t	normalize
q31_t *	pTwiddle
q31_t *	pCosFactor
csky_rfft_instance_q31 *	pRfft
csky_cfft_radix4_instance_q31 *	pCfft

Field Documentation

uint16_t csky_dct4_instance_q31::N

length of the DCT4.

uint16_t csky_dct4_instance_q31::Nby2

half of the length of the DCT4.

q31_t csky_dct4_instance_q31::normalize

normalizing factor.

csky_cfft_radix4_instance_q31* csky_dct4_instance_q31::pCfft

points to the complex FFT instance.

q31_t* csky_dct4_instance_q31::pCosFactor

points to the cosFactor table.

csky_rfft_instance_q31* csky_dct4_instance_q31::pRfft

points to the real FFT instance.

q31_t* csky_dct4_instance_q31::pTwiddle

points to the twiddle factor table.