+ // pick a buffer size that is a power of 2 (by masking off low bits)
+ buffer_size = i = (int)(requested->speed * 0.15f);
+ while (buffer_size & (buffer_size-1))
+ buffer_size &= (buffer_size-1);
+ // then check if it is the nearest power of 2 and bump it up if not
+ if (i - buffer_size >= buffer_size >> 1)
+ buffer_size *= 2;
+