Prevent freq calculation to produce from NaN/inf -- #15

x42 · Nov 11, 2019 · a551bd2 · a551bd2
1 parent 5a44436
commit a551bd2
Showing 1 changed file with 2 additions and 7 deletions.
diff --git a/src/retuner.cc b/src/retuner.cc
@@ -439,13 +439,8 @@ Retuner::findcycle (void)
 		x      = _fftTdata[j - 1];
 		y      = _fftTdata[j];
 		z      = _fftTdata[j + 1];
-		_cycle = j + 0.5f * (x - z) / (z - 2 * y + x - 1e-9f);
-		if (_cycle < 0) {
-			// sometimes the above formula returns -inf
-			// which ends up crashing the process
-			// Cause : x, y, z being floats
-			// -> Could also be fixed by using doubles instead
-			_cycle = 0;
+		if (fabsf(z - 2 * y + x) > 2e-9f) {
+			_cycle = j + 0.5f * (x - z) / (z - 2 * y + x - 1e-9f);
 		}
 	}
 }