| #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; |
| } |