-/* Make sure there's at least 8 bits of variance in the samples */
-#define MIN_VARIANCE (128 * 128)
-
-/* Make sure the signal is spread around a bit */
-#define MAX_VARIANCE (512 * 512)
-
-#define ADD_STATS(value) do { \
- sum += (value); \
- sum2 += (value) * (value); \
- } while(0)
-
-#define VARIANCE(n) ((sum2 - (sum / (n) * sum)) / (n))