UpdatePathMetricsDV

Searches for the state with the minimum path metric.

Syntax

IppStatus ippsUpdatePathMetricsDV_16u(Ipp16u* pBranchError, Ipp16u* pMinPathError, Ipp8u* pMinSost, Ipp16u* pPathError, int state);

Parameters

pBranchError	Pointer to the branch error table.
pMinPathError	Pointer to the current minimum path error metric.
pMinSost	Pointer to the number of states with the minimum metric.
pPathError	Pointer to the table of accumulated path errors.
state	Number of states of a convolutional encoder.

Description

The function ippsBuildSymblTableDV4D is declared in the ipps.h file. This function searches for the state with the minimum path error metric and stores its number in the pMinSost. For all states, the minimum metric is subtracted from the path metric. The branch errors for all states are set to be infinitely large as is required for the next step of the Viterbi decoding.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when any of the specified pointers is NULL.