Finite impulse response (FIR) predictor.

Data Structures
struct	fir_params_struct
	Parameters for fir predictor. More...
struct	fir_struct
	Finite Impulse Response predictor class definition. More...
Files
file	fir.h
	Private interface for the Finite Impulse Response predictor.
file	fir_lib.h
	Public interface for the Finite Impulse Response predictor.
Typedefs
typedef struct fir_params_struct	fir_params_t
	Parameters for fir predictor.
typedef struct fir_struct	fir_t
	Finite Impulse Response predictor class definition.
Functions
qos_rv	fir_register (void)
	Register the Finite Impulse Response class with the framework.
qos_rv	fir_init (void *self, void *params)
	Initialize a fir object.
qos_rv	fir_final (qmgr_pred_t *self)
	Virtual destructor for a fir object.
qos_rv	fir_add_sample (qmgr_pred_t *pred, qres_time_t new_sample)
	Virtual add_sample function for fir object.
qres_time_t	fir_get_exp_value (qmgr_pred_t *pred)
qos_rv	fir_set_defaults (void)
	Configures a Finite Impulse Response predictor with default parameters.
qos_rv	fir_set_coeffs (int *coeffs, int coeffs_num)
	Sets the FIR coefficients.

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Function Documentation

qos_rv fir_add_sample	(	qmgr_pred_t *	pred,
		qres_time_t	new_sample
	)

Virtual add_sample function for fir object.

Todo:

2 versions of this function could be created, one for the initial transitory when the window is not yet full, and another to be used when the window is full. By replacing the function pointer in the virtual table, this would avoid one comparison in the function at each call.

qos_rv fir_init	(	void *	self,
		void *	params
	)

Initialize a fir object.

Parameters:

params

Set of parameters passed by the QMGR Library. When in kernel-space, self is a pointer to user-space.

Returns:

QOS_OK or one of the predefined error-codes.

qos_rv fir_set_coeffs	(	int *	coeffs,
		int	coeffs_num
	)

Sets the FIR coefficients.

Parameters:

	coeffs	An integer array containing the FIR coefficients, in temporal order, i.e., coeffs[coeffs_num-1] is applied to the latest sample, coeffs[coeffs_num-2] is applied to the previous one, and so on.
	coeffs_num	Number of coefficients

qos_rv fir_set_defaults

(

void

)

Configures a Finite Impulse Response predictor with default parameters.

Tells to the QoS library to use a Finite Impulse Response predictor with a default set of parameters.