sbr_enc_resampler_fp.c

audio-video-codecs.rar语音编解码器

/*//////////////////////////////////////////////////////////////////////////////
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2006 Intel Corporation. All Rights Reserved.
//
*/

#include <ipps.h>
#include <ippac.h>
#include <math.h>
#include "align.h"
#include "sbr_enc_api_fp.h"
#include "aac_status.h"

/********************************************************************/

#ifndef NULL
#define NULL 0
#endif

/********************************************************************/

#if 1

#define LEN_RS_FILTER 65

static Ipp32f pTabFirCoefsKovalResampler65[] = {
  0.001528047897641f, 0.001041615092844f, 0.000097822857246f, -0.001299411518046f,
    -0.002317956700839f, -0.001650433913058f, 0.000601873542942f, 0.003327121906948f,
    0.004171001097190f, 0.001946227878677f, -0.002725842274920f, -0.006602610006835f,
    -0.006422148891553f, -0.000916257798822f, 0.006891796540917f, 0.011535548672663f,
    0.008228313898783f, -0.002521817453714f, -0.014394333696814f, -0.018145919322278f,
    -0.008566583300550f, 0.010775561315008f, 0.027401050935321f, 0.027322985617968f,
    0.004871427658090f, -0.030146726019331f, -0.054800191240244f, -0.044186884614393f,
    0.013276904110205f, 0.106258586046795f, 0.202606266447074f, 0.263760118622812f,
    0.263760118622812f, 0.202606266447074f, 0.106258586046795f, 0.013276904110205f,
    -0.044186884614393f, -0.054800191240244f, -0.030146726019331f, 0.004871427658090f,
    0.027322985617968f, 0.027401050935321f, 0.010775561315008f, -0.008566583300550f,
    -0.018145919322278f, -0.014394333696814f, -0.002521817453714f, 0.008228313898783f,
    0.011535548672663f, 0.006891796540917f, -0.000916257798822f, -0.006422148891553f,
    -0.006602610006835f, -0.002725842274920f, 0.001946227878677f, 0.004171001097190f,
    0.003327121906948f, 0.000601873542942f, -0.001650433913058f, -0.002317956700839f,
    -0.001299411518046f, 0.000097822857246f, 0.001041615092844f, 0.001528047897641f
};
#endif
/********************************************************************/

#ifndef NULL
#define NULL 0
#endif

/********************************************************************/

AACStatus sbrencResampler(Ipp32f* pSrc, Ipp32f* pDst, IppsFIRState_32f* pFilterResample)
{
  IppStatus status = ippStsNoErr;
  __ALIGN Ipp32f  tmpBuf[2048];
  Ipp32s dstLen = 1024;
  Ipp32s phase = 0;

  status = ippsFIR_32f( pSrc, tmpBuf, 2048, pFilterResample );
  if ( status != ippStsNoErr ){
    return AAC_BAD_PARAMETER;
  }

  status = ippsSampleDown_32f(tmpBuf, 2048, pDst, &dstLen, 2, &phase);
  if ( status != ippStsNoErr ){
    return AAC_BAD_PARAMETER;
  }

  return AAC_OK;
}

/********************************************************************/

//AACStatus sbrencResampler_v2_32f(Ipp32f* pSrc, Ipp32f* pDst, const Ipp32f* pRSCoefTab, Ipp32s nCoef)
AACStatus sbrencResampler_v2_32f(Ipp32f* pSrc, Ipp32f* pDst)
{
  Ipp32s i, j, k, l;
  Ipp32f sum;
  Ipp32f* pRSCoefTab = pTabFirCoefsKovalResampler65;
  Ipp32s nCoef = LEN_RS_FILTER;

  k = nCoef-1;
  k = nCoef;
  for (i=0; i<1024; i++ ) {

    sum = 0.0;
    l = k;
    for (j=0; j<nCoef; j++) {
      sum += pRSCoefTab[j] * pSrc[l--];
    }

    pDst[i] = sum;
    k+=2;
  }

  return AAC_OK;
}

/********************************************************************/

void sbrencResamplerFree(IppsFIRState_32f* pFilterResample)
{
   if (NULL != pFilterResample)
     ippsFIRFree_32f(pFilterResample);
}