ISFQuantDecode

Decodes quantized ISFs from the received codebook index.

Syntax

IppStatus ippsISFQuantDecode_AMRWBE_16s(const Ipp16s* pSrcIdxs, Ipp16s* pDstQntIsf, Ipp16s* pSrcDstResidual, const Ipp16s* pSrcPrevQntIsf, Ipp16s* pSrcDstIsfMemory, Ipp32s bfi, Ipp32s splitMask);

Parameters

pSrcIdxs	Pointer to the seven-element vector containing codebook indices of the quantized LSPs.
pDstQntIsf	Pointer to a 16-element destination vector containing quantized ISF in cosine domain.
pSrcDstResidual	Pointer to the 16-element quantized ISF residual from the previous frame.
pSrcPrevQntIsf	Pointer to the 16-element quantized ISF vector from the previous frame.
pSrcDstIsfMemory	Pointer to the 64-element vector containing four subframe ISF sets.
bfi	Bad frame indicator: value "0" indicates a good frame, all other values indicate a bad frame.
splitMask	Binary mask for the second-stage splitting. It contains 5 significant bits, low significant bit corresponds to the low number of splitting.

Description

The function ippsISFQuantDecode_AMRWBE is declared in ippsc.h file. The function decodes quantized ISFs from the received codebook index. This function is extension of the function ippsISFQuantDecode_AMRWE. If the parameter splitMask is set to 0, both functions are identical. Otherwise the function performs the second-level splitting in accordance with the splitMask.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointer is NULL.