From 1e3515e03e2dbdbd48dacc31ef75d25c201a4c51 Mon Sep 17 00:00:00 2001
From: Martin Storsjo <martin@martin.st>
Date: Mon, 30 Oct 2017 23:06:44 +0200
Subject: Fix an assertion failure (avoid division by zero) when encoding a
 particular input

---
 libAACenc/src/aacenc_tns.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'libAACenc')

diff --git a/libAACenc/src/aacenc_tns.cpp b/libAACenc/src/aacenc_tns.cpp
index 5fcd309..3026d69 100644
--- a/libAACenc/src/aacenc_tns.cpp
+++ b/libAACenc/src/aacenc_tns.cpp
@@ -1147,6 +1147,9 @@ static INT FDKaacEnc_AutoToParcor(
     workBuffer++;
   }
 
+  if (input[0] == 0)
+    input[0] = 1;
+
   tmp = fMult((FIXP_DBL)((LONG)TNS_PREDGAIN_SCALE<<21), fDivNorm(fAbs(autoCorr_0), fAbs(input[0]), &scale));
   if ( fMultDiv2(autoCorr_0, input[0])<FL2FXCONST_DBL(0.0f) ) {
     tmp = -tmp;
-- 
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