Buffer Sizes for RFFT

Functions
int32_t	arm_rfft_tmp_buffer_size (arm_math_target_arch arch, arm_math_datatype dt, uint32_t nb_samples, uint32_t buf_id)
	Calculate required length for the temporary buffer for both RFFT and RIFFT.
int32_t	arm_rfft_output_buffer_size (arm_math_target_arch arch, arm_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the output buffer.
int32_t	arm_rifft_input_buffer_size (arm_math_target_arch arch, arm_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the input buffer.

Description

end of CFFTBuffers group

Function Documentation

arm_rfft_output_buffer_size()

int32_t arm_rfft_output_buffer_size	(	arm_math_target_arch	arch,
		arm_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the output buffer.

Parameters

[in]	arch	Target architecture identification
[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

arm_rfft_tmp_buffer_size()

int32_t arm_rfft_tmp_buffer_size	(	arm_math_target_arch	arch,
		arm_math_datatype	dt,
		uint32_t	nb_samples,
		uint32_t	buf_id
	)

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

Parameters

[in]	arch	Target architecture identification
[in]	dt	Data type of the input data
[in]	nb_samples	Number of samples in the input data
[in]	buf_id	Identification for the temporary buffer

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

arm_rifft_input_buffer_size()

int32_t arm_rifft_input_buffer_size	(	arm_math_target_arch	arch,
		arm_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the input buffer.

Parameters

[in]	arch	Target architecture identification
[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