From f5be84cfbc9c132a867ae8a8c0e0de26ed1a4e88 Mon Sep 17 00:00:00 2001
From: Janne Grunau <janne-libav@jannau.net>
Date: Thu, 5 Jan 2012 21:57:22 +0100
Subject: ipmovie: do not read audio packets before the codec is known

Prevents a division by zero.
---
 libavformat/ipmovie.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'libavformat/ipmovie.c')

diff --git a/libavformat/ipmovie.c b/libavformat/ipmovie.c
index 4bd3580bc2..bd5ec30016 100644
--- a/libavformat/ipmovie.c
+++ b/libavformat/ipmovie.c
@@ -116,6 +116,11 @@ static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb,
     int chunk_type;
 
     if (s->audio_chunk_offset) {
+        if (s->audio_type == CODEC_ID_NONE) {
+            av_log(NULL, AV_LOG_ERROR, "Can not read audio packet before"
+                   "audio codec is known\n");
+                return CHUNK_BAD;
+        }
 
         /* adjust for PCM audio by skipping chunk header */
         if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) {
-- 
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