FDPResetGroup

Resets predictors for group of spectral lines.

Syntax

IppStatus ippsFDPResetGroup_32f (int resetGroupNumber, int step, IppsFDPState_32f* pFDPState);

Parameters

resetGroupNumber	Number of the group to be reset.
step	Distance between two neighboring spectral lines in the group.
pFDPState	Pointer to the predictor specific state structure.

Description

This function is declared in the ippac.h header file. The function ippsFDPResetGroup resets predictors for each step-th spectral line beginning from the start up to the end of spectrum.

Below see code example of using ippsFDPInv and ippsFDPResetGroup_32f functions.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when the pFDPState pointer is NULL.
ippStsSizeErr	Indicates an error when resetGroupNumber or step is less than or equal to 0.
ippStsContextMatchErr	Indicates an error when the state structure is invalid.

ippsFDPInv and ippsFDPResetGroup Usage

/* 1 step - initialization */

IppsFDPState_32f* pFDPState;

ippsFDPInitAlloc_32f(&pFDPState, 1024);

/* 2 step - using inside decoder. Something like this (from AAC)*/

ippsFDPInv_32f_I(p_spectrum, sfb_offset_long_window,

                 pred_max_sfb, prediction_used,

                 pFDPState);

if ((predictor_reset) &&

    predictor_reset_group_number > 0 &&

    predictor_reset_group_number < 31) {

    ippsFDPResetGroup_32f(30, predictor_reset_group_number - 1, pFDPState);

 /* 3 step - freeing */

 ippsFDPFree_32f(pFDPState);