AdaptiveCodebookDecode

Performs the adaptive codebook decoding.

Syntax

IppStatus ippsAdaptiveCodebookDecode_AMRWB_16s(int valAdptIndex, Ipp16s* pResultFracPitchLag, Ipp16s* pSrcDstExcitation, Ipp16s* pPitchLag, Ipp16s* pPitchLagBounds, int subFrame, int bfi, int unusableFrame, IppSpchBitRate mode, IppsAdaptiveCodebookDecodeState_AMRWB_16s* pState);

Parameters

valAdptIndex	Adaptive codebook index.
pResultFracPitchLag	Pointer to the fractional pitch lag obtained during the adaptive codebook search.
pSrcDstExcitation	Pointer to the 321-element excitation vector.
pPitchLag	Pointer to the integral pitch lag.
pPitchLagBounds	Pointer to the previous integral pitch lag bounds.
subFrame	Subframe number.
bfi	Bad frame indicator. Value "0" signifies a good frame; any other value signifies a bad frame.
unusableFrame	Value "0" signifies a lost frame with content that can not be used at all.
mode	Encoding mode.
pState	Pointer to the memory of the adaptive codebook decode module.

Description

This function is declared in ippsc.h file. It performs the following steps:

1. If no errors are detected on the current frame, the function extracts integer and fractional pitch lags from the adaptive codebook indices.

2. If errors are detected, the function recovers the integer pitch either from the previous integer pitch or the LTP-lag. See clause 6.2.3.4 in 3GPP TS 26.191 V5.1.0.

3. To obtain the adaptive codebook vector, the function ippsAdaptiveCodebookDecode_AMRWB applies the same adaptive codebook computation procedure as described in the function ippsAdaptiveCodebookSearch_AMRWB.

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.
ippStsSizeErr	Indicates an error when subFrame is less than 0 or greater than 3.