From feb3f39614b88c113211a98dda1bc2fe5c3c6957 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 27 Nov 2015 21:02:13 +0100
Subject: [PATCH] avcodec/jpeg2000dwt: Check ndeclevels before calling
 dwt_encode*()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/jpeg2000dwt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/jpeg2000dwt.c b/libavcodec/jpeg2000dwt.c
index 36e443d478..a46c93a9b2 100644
--- a/libavcodec/jpeg2000dwt.c
+++ b/libavcodec/jpeg2000dwt.c
@@ -580,6 +580,9 @@ int ff_jpeg2000_dwt_init(DWTContext *s, int border[2][2],
 
 int ff_dwt_encode(DWTContext *s, void *t)
 {
+    if (s->ndeclevels == 0)
+        return 0;
+
     switch(s->type){
         case FF_DWT97:
             dwt_encode97_float(s, t); break;