C / C++ / MFC

int CAudioOut::Reduce48to8kHz(short* pBuffer, int nBytesToReduce)
{
    ASSERT((nBytesToReduce % 6) == 0);
    short* pSrc = pBuffer;
    short* pDst = pBuffer;
    for(int i = 0; i < (nBytesToReduce / 6); i++)
    {
        long val = 0;
        val = *pSrc++;
        val += (long)*pSrc++ * 4;
        val += (long)*pSrc++ * 14;
        val += (long)*pSrc++ * 14;
        val += (long)*pSrc++ *4;
        val += *pSrc++;
        *pDst++ = (short)(val/38);
    }
    return (pDst - pBuffer);
}

unsigned char CG711::encodeULaw(short pcm_val)
{
static int exp_lut[256] = {0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
                             4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
                             5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
                             5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
                             6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
                             6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
                             6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
                             6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
                             7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7};
    int sign, exponent, mantissa;
    unsigned char ulawbyte;

    /* Get the sample into sign-magnitude. */
    sign = (pcm_val >> 8) & 0x80;		/* set aside the sign */
    if (sign != 0) pcm_val = -pcm_val;		/* get magnitude */
    if (pcm_val > CLIP) pcm_val = CLIP;		/* clip the magnitude */

    /* Convert from 16 bit linear to ulaw. */
    pcm_val = pcm_val + BIAS;
    exponent = exp_lut[(pcm_val >> 7) & 0xFF];
    mantissa = (pcm_val >> (exponent + 3)) & 0x0F;
    ulawbyte = ~(sign | (exponent << 4) | mantissa);
    #ifdef ZEROTRAP
      if (ulawbyte == 0) ulawbyte = 0x02;	/* optional CCITT trap */
    #endif

    return(ulawbyte);
}
//which I call 
for(int i = 0; i < size2; i++)
        newPacket.m_payload[i] = g711.encodeULaw(downsampledAudio[i]);

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