pns.c

MP3 for ARM codec. [asm+C]

/* ***** BEGIN LICENSE BLOCK *****  
 * Source last modified: $Id: pns.c,v 1.1 2005/02/26 01:47:34 jrecker Exp $ 
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/**************************************************************************************
 * Fixed-point AAC decoder using Intel IPP libraries
 * Jon Recker ([e-mail])
 * February 2005
 *
 * pns.c - apply perceptual noise substitution
 **************************************************************************************/

#include "coder.h"

/**************************************************************************************
 * Function:    PNS
 *
 * Description: apply perceptual noise substitution, if enabled (MPEG-4 only)
 *
 * Inputs:      valid AACDecInfo struct
 *              index of current channel
 *
 * Outputs:     shaped noise in scalefactor bands where PNS is active
 *
 * Return:      0 if successful, -1 if error
 **************************************************************************************/
int PNS(AACDecInfo *aacDecInfo, int ch)
{
	int nSamps;
	PSInfoBase *psi;
	IppStatus err;
	IppAACIcsInfo *icsInfo;

	/* validate pointers */
	if (!aacDecInfo || !aacDecInfo->psInfoBase)
		return -1;
	psi = (PSInfoBase *)(aacDecInfo->psInfoBase);
	icsInfo = psi->chanInfo[ch].pIcsInfo;

	nSamps = (icsInfo->winSequence == 2 ? NSAMPS_SHORT : NSAMPS_LONG);
	err = ippStsNoErr;

	/* IPP still doesn't support PNS properly (IPP 4.1 on Windows)
	 *  - see comments in ipp\noiseless.c (ippsNoiselessDecode_AAC() errors if cb == 13)\
	 *  - for now return no error (should never get here if file uses PNS, since DecodeNoiselessData() will error)
	 * 
	 * err = ippsDecodePNS_AAC_32s(psi->coef[ch], psi->ltpFlag, psi->sfbCodeBook[ch], psi->scaleFactors[ch],
	 *         icsInfo->maxSfb, icsInfo->numWinGrp, icsInfo->pWinGrpLen, psi->sampRateIdx, nSamps, &psi->seed);
	 */

	if (err)
		return -1;

	return 0;
}