mframe.c

Intel开发的IPP库的应用实例

/*
//
//                  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) 2003-2006 Intel Corporation. All Rights Reserved.
//
//     Intel(R) Integrated Performance Primitives Advanced Aurora Sample for Windows*
//
//   By downloading and installing this sample, you hereby agree that the
//   accompanying Materials are being provided to you under the terms and
//   conditions of the End User License Agreement for the Intel(R) Integrated
//   Performance Primitives product previously accepted by you. Please refer
//   to the file ippEULA.rtf located in the root directory of your Intel(R) IPP
//   product installation for more information.
//
//   ES 202 050 v1.1.1 is the international standard promoted by ETSI
//   and other organizations. Implementations of these standards, or the standard
//   enabled platforms may require licenses from various entities, including
//   Intel Corporation.
//
*/

#include "mframe.h"
#include <stdio.h>
#include <math.h>

void madeHeader(MFrame *pFrame,int mframeCounter){

  unsigned short int crc, data;

  unsigned char sync[2]={0xb2,0x87};

  pFrame->pFrameBuffer[0] = sync[0];
  pFrame->pFrameBuffer[1] = sync[1];

  data  = 0x0003 & pFrame->sampRate;
  data |= 0x0078 & (mframeCounter<<3);

  crc = calcCRC(data);

  pFrame->pFrameBuffer[2] = 0xff & data;
  pFrame->pFrameBuffer[3] = 0xff & (data >> 8);
  pFrame->pFrameBuffer[4] = 0xff & crc ;
  pFrame->pFrameBuffer[5] = 0xff & (crc >> 8);
  return;
}

unsigned short calcCRC(unsigned short data){

  unsigned short pMask[16] = {0x808b,0xc0ce,0xe0ed,0x7077,0xb8b0,0x5c58,0x2e2c,
                 0x1716,0x8b01,0x4581,0x22c1,0x1161,0x08b1,0x0459,0x022d,0x0117};

  int i;
  unsigned short mask;
  unsigned short crc=0;

  for (i=0,mask=0x1; i<16; i++,mask<<=1)
    if (mask & data)
      crc ^= pMask[i];

  return crc;
}

unsigned char encodeCRC(unsigned char *data){

  int i;
  unsigned char crcBuff[16] = {0,13,3,14,6,11,5,8,12,1,15,2,10,7,9,4};
  unsigned char crc,idx;

  crc = 0;
  for (i=0; i<22; i++){
    idx = (i % 2 == 0) ? (0xf & data[i / 2]) : ((0xf0 & data[i / 2]) >> 4);
    crc = crcBuff[crc ^ idx];
  }

  return crc;
}


int CheckFrames(unsigned char *pIndexVQBuffer,unsigned char *pCRCBuffer,short crc){
   int iCountFoundZero;
   int FrameNoZero;
   int j;
   FrameNoZero = 2;
   if(encodeCRC(pCRCBuffer)!=crc){
       printf("Warning: A CRC error detected in multiframe \n");

       iCountFoundZero = 0;
       for(j=0; j<7; j++)
         if(pIndexVQBuffer[j]==0) iCountFoundZero++;

       if(iCountFoundZero>=5)
          FrameNoZero=0;
       else{
          FrameNoZero = 0;

          for(j=7; j<14; j++)
              if(pIndexVQBuffer[j]==0) iCountFoundZero++;

          if(iCountFoundZero>=5)
             FrameNoZero=1;
          else
             FrameNoZero=2;
       }
             FrameNoZero |= 0x4;
   }
   else{
      iCountFoundZero = 0;
      for(j=0; j<7; j++)
         if(pIndexVQBuffer[j]==0) iCountFoundZero++;

      if(iCountFoundZero==7)
         FrameNoZero=0;
      else{
         iCountFoundZero = 0;
         for(j=7; j<14; j++)
            if(pIndexVQBuffer[j]==0) iCountFoundZero++;

         if(iCountFoundZero==7)
            FrameNoZero=1;
         else
            FrameNoZero=2;
      }
   }
   return FrameNoZero;
}

int CheckThreshold(short *pPrev){
short treshold_16s[14] = {448,362,316,316,281,266,
               252,235,225,212,202,186,1042,103};

  int error,i;
  short diff[14];
  for (i=0; i<14; i++)
     diff[i]=(short)fabs(pPrev[i]-pPrev[i+16]);

  error = 0;
  for (i=0;i<14;i+=2)
         if((diff[i] > treshold_16s[i]) || (diff[i+1] > treshold_16s[i+1])) error++;

  if(error >= 2){
    printf("Warning:Threshold error(s) in multiframe");
    return 1;
  }
  return 0;
}