Buffer Sizes for RFFT

Functions
int32_t	riscv_rfft_tmp_buffer_size (riscv_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the temporary buffer for both RFFT and RIFFT. More...
int32_t	riscv_rfft_output_buffer_size (riscv_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the output buffer. More...
int32_t	riscv_rifft_input_buffer_size (riscv_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the input buffer. More...

Detailed Description

end of CFFTBuffers group

Function Documentation

riscv_rfft_output_buffer_size()

int32_t riscv_rfft_output_buffer_size	(	riscv_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the output buffer.

Parameters

[in]	dt	Data type of the input data
[in]	nb_samples	Number of samples in the input data

Returns

Length in datatype elements (real numbers) for the output buffer

Note

0 means not applicable (temporary buffer not needed)

-1 means error : configuration not supported

riscv_rfft_tmp_buffer_size()

int32_t riscv_rfft_tmp_buffer_size	(	riscv_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the temporary buffer for both RFFT and RIFFT.

Parameters

[in]	dt	Data type of the input data
[in]	nb_samples	Number of samples in the input data

Returns

Length in datatype elements (real numbers) for the temporary buffer

Note

0 means not applicable (temporary buffer not needed)

-1 means error : configuration not supported

nb_samples is the RFFT length, also means how many real numbers are in the input buffer nb_samples * 2U is the buffer length used for CFFT And there is an extra buffer needed for temp result

riscv_rifft_input_buffer_size()

int32_t riscv_rifft_input_buffer_size	(	riscv_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the input buffer.

Parameters

[in]	dt	Data type of the input data
[in]	nb_samples	RFFT length in samples

Returns

Length in datatype elements (real numbers) for the input buffer

Note

0 means not applicable (temporary buffer not needed)

-1 means error : configuration not supported