DecodeGain

Decodes adaptive and fixed-codebook gains.

Syntax

IppStatus ippsDecodeGain_AMRWB_16s(int valQIndex, Ipp32s valEnergy, Ipp16s* pDstPitchGain, int* pDstCodeGain, int bfi, int prevBfi, Ipp16s* pSrcDstPastEnergy, Ipp16s* pPrevCodeGain, Ipp16s* pSrcDstPastCodeGain, IppSpchBitRate mode);

Parameters

valQIndex	Index of quantization.
valEnergy	Pointer to the input filtered adaptive codebook vector y(n).
pDstPitchGain	Pointer to the decoded pitch gain.
pDstCodeGain	Pointer to the decoded code gain.
bfi	Bad frame indicator.
prevBfi	Bad frame indicator of the previous frame.
pSrcDstPastEnergy	Past quantized energies.
pPrevCodeGain	Past code gain.
pSrcDstPastCodeGain	Past code gain for frame erasures.
mode	Decoding mode.

Description

The function ippsDecodeGain_AMRWB is declared in ippsc.h file.

If there are no errors detected in the frame, the function computes predicted and fixed codebook gains.

In case of frame erasure, the gains are the attenuated versions of the previous gains.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointers is NULL.
ippStsRangeErr	Indicates an error when mode is not a valid element of the enumerated type IppSpchBitRate.