From 0cd90a86100db1871a83073ebf9c08f218173e3d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20=C3=96man?= <andreas@lonelycoder.com>
Date: Sun, 7 Nov 2010 22:43:24 +0000
Subject: [PATCH] Avoid division by zero if h264 width and/or height is 0.
 (Happens on corrupt data)

---
 src/parser_h264.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/parser_h264.c b/src/parser_h264.c
index 38330490..7f31f236 100644
--- a/src/parser_h264.c
+++ b/src/parser_h264.c
@@ -412,10 +412,12 @@ h264_decode_slice_header(th_stream_t *st, bitstream_t *bs, int *pkttype,
 
     int w = p->sps[sps_id].aspect_num * st->st_width;
     int h = p->sps[sps_id].aspect_den * st->st_height;
-    int d = gcd(w, h);
 
-    st->st_aspect_num = w / d;
-    st->st_aspect_den = h / d;
+    if(w & h) { 
+      int d = gcd(w, h);
+      st->st_aspect_num = w / d;
+      st->st_aspect_den = h / d;
+    }
 
   } else {
     st->st_aspect_num = 0;