DecodeMsPNS

Implements perceptual noise substitution (PNS) coding in the case of joint coding.

Syntax

IppStatus ippsDecodeMsPNS_AAC_32s(Ipp32s* pSrcDstSpec, int* pSrcDstLtpFlag, Ipp8u* pSfbCb, Ipp16s* pScaleFactor, int maxSfb, int numWinGrp, int* pWinGrpLen, int samplingFreqIndex, int winLen, int* pRandomSeed, int channel, Ipp8u* pMsUsed, int* pNoiseState);

Parameters

pSrcDstSpec	Pointer to spectrum coefficients for perceptual noise substitution (PNS).
pSrcDstLtpFlag	Pointer to long term predict (LTP) flag.
pSfbCb	Pointer to the scalefactor code book.
pScaleFactor	Pointer to the scalefactor coefficients.
maxSfb	Number of maximum scalefactor band.
numWinGrp	Number of window groups.
pWinGrpLen	Pointer to the length of every window group.
samplingFreqIndex	Sampling frequency index.
winLen	Window length.
pRandomSeed	Random seed.
channel	Index of the current channel: 0 means left, 1 means right.
pMsUsed	Pointer to MS-used buffer in CPE structure.
pNoiseState	Pointer to the noise state buffer, which stores the left channel noise random seed for every scalefactor band. When pMsUsed[sfb]==1, the content in this buffer is used for the right channel.

Description

This function is declared in the ippac.h file. The function implements perceptual noise substitution (PNS) coding in the case of joint coding. 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].
ippStsAacWinGrpErr	Indicates an error when maxWinGrp exceeds [0,8].
ippStsAacSmplRateIdxErr	Indicates an error when samplingFreqIndex exceeds [0,16].
ippStsAacWinLenErr	Indicates an error when winLen is not equal to 128 or 1024.