DecodePNS

Implements perceptual noise substitution (PNS) coding within individual channel stream (ICS).

Syntax

IppStatus ippsDecodePNS_AAC_32s(Ipp32s* pSrcDstSpec, int* pSrcDstLtpFlag, Ipp8u* pSfbCb, Ipp16s* pScaleFactor, int maxSfb, int numWinGrp, int* pWinGrpLen, int samplingFreqIndex, int winLen, int* pRandomSeed);

Parameters

pSrcDstSpec	Pointer to spectrum coefficients for perceptual noise substitution (PNS).
pSrcDstLtpFlag	Pointer to long term predict (LTP) flag.
pSfbCb	Pointer to the scale factor codebook.
pScaleFactor	Pointer to the scalefactor value.
maxSfb	Number of scale factor bands used in this layer.
numWinGrp	Number of window groups.
pWinGrpLen	Pointer to the length of every window group.
samplingFreqIndex	Sampling frequency index.
winLen	Window length. 1024 for long windows, 128 for short windows.
pRandomSeed	Random seed for PNS.

Description

This function is declared in the ippac.h file. The function implements perceptual noise substitution (PNS) coding within the individual channel stream (ICS). Certain sets of spectral coefficients are derived from random vectors rather than from Huffman‑coded symbols and inverse quantization process.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when at least one of the specified pointers is NULL.
ippStsAacMaxSfbErr	Indicates an error when maxSfb exceeds [0,IPP_AAC_MAX_SFB].
ippStsAacSmplRateIdxErr	Indicates an error when samplingFreqIndex exceeds [0,16].
ippStsAacWinLenErr	Indicates an error when winLen is not equal to 128 or 1024.