Functions
void	arm_dct4_f32 (const arm_dct4_instance_f32 S, float32_t pState, float32_t *pInlineBuffer)
	Processing function for the floating-point DCT4/IDCT4.

arm_status	arm_dct4_init_f32 (arm_dct4_instance_f32 S, arm_rfft_instance_f32 S_RFFT, arm_cfft_radix4_instance_f32 *S_CFFT, uint16_t N, uint16_t Nby2, float32_t normalize)
	Initialization function for the floating-point DCT4/IDCT4.

Description

Function Documentation

Processing function for the floating-point DCT4/IDCT4.

Deprecated:: Do not use this function. It is using a deprecated version of the RFFT.

Parameters

[in]	S	points to an instance of the floating-point DCT4/IDCT4 structure
[in]	pState	points to state buffer
[in,out]	pInlineBuffer	points to the in-place input and output buffer

Initialization function for the floating-point DCT4/IDCT4.

Deprecated:: Do not use this function. It is using a deprecated version of the RFFT.

Parameters

[in,out]	S	points to an instance of floating-point DCT4/IDCT4 structure
[in]	S_RFFT	points to an instance of floating-point RFFT/RIFFT structure
[in]	S_CFFT	points to an instance of floating-point CFFT/CIFFT structure
[in]	N	length of the DCT4
[in]	Nby2	half of the length of the DCT4
[in]	normalize	normalizing factor.

Returns

execution status

Normalizing factor: The normalizing factor is sqrt(2/N), which depends on the size of transform N. Floating-point normalizing factors are mentioned in the table below for different DCT sizes: