csky_dct4_instance_q15 Struct Reference

Instance structure for the Q15 DCT4/IDCT4 function.

Data Fields
uint16_t	N
uint16_t	Nby2
q15_t	normalize
q15_t *	pTwiddle
q15_t *	pCosFactor
csky_rfft_instance_q15 *	pRfft
csky_cfft_radix4_instance_q15 *	pCfft

Field Documentation

uint16_t csky_dct4_instance_q15::N

length of the DCT4.

uint16_t csky_dct4_instance_q15::Nby2

half of the length of the DCT4.

q15_t csky_dct4_instance_q15::normalize

normalizing factor.

csky_cfft_radix4_instance_q15* csky_dct4_instance_q15::pCfft

points to the complex FFT instance.

q15_t* csky_dct4_instance_q15::pCosFactor

points to the cosFactor table.

csky_rfft_instance_q15* csky_dct4_instance_q15::pRfft

points to the real FFT instance.

q15_t* csky_dct4_instance_q15::pTwiddle

points to the twiddle factor table.