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#include "ref.h"
void ref_var_f32(
float32_t * pSrc,
uint32_t blockSize,
float32_t * pResult)
{
uint32_t i;
float32_t sum=0, sumsq=0;
if (blockSize == 1)
{
*pResult = 0;
return;
}
for(i=0;i<blockSize;i++)
{
sum += pSrc[i];
sumsq += pSrc[i] * pSrc[i];
}
*pResult = (sumsq - sum * sum / (float32_t)blockSize) / ((float32_t)blockSize - 1);
}
void ref_var_q31(
q31_t * pSrc,
uint32_t blockSize,
q31_t * pResult)
{
uint32_t i;
q63_t sum=0, sumsq=0;
q31_t in;
if (blockSize == 1)
{
*pResult = 0;
return;
}
for(i=0;i<blockSize;i++)
{
in = pSrc[i] >> 8;
sum += in;
sumsq += (q63_t)in * in;
}
*pResult = (sumsq - sum * sum / (q31_t)blockSize) / ((q31_t)blockSize - 1) >> 15;
}
void ref_var_q15(
q15_t * pSrc,
uint32_t blockSize,
q15_t * pResult)
{
uint32_t i;
q31_t sum=0;
q63_t sumsq=0;
if (blockSize == 1)
{
*pResult = 0;
return;
}
for(i=0;i<blockSize;i++)
{
sum += pSrc[i];
sumsq += (q63_t)pSrc[i] * pSrc[i];
}
*pResult = (q31_t)((sumsq - (q63_t)sum * sum / (q63_t)blockSize) / ((q63_t)blockSize - 1)) >> 15;
}
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