From 8a2679ada43665f19eb8282e82f2acaad8ba4f84 Mon Sep 17 00:00:00 2001
From: Luca Abeni <lucabe72@email.it>
Date: Thu, 17 Jun 2010 10:30:52 +0000
Subject: [PATCH] Simplify (no need to check for st->codec->extradata) and
 correct (extradata_size must be at least 5 bytes) the H.264 MP4 syntax check
 in rtpenc.c

Originally committed as revision 23638 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/rtpenc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c
index 5abd490cc4..3a541dd283 100644
--- a/libavformat/rtpenc.c
+++ b/libavformat/rtpenc.c
@@ -133,8 +133,7 @@ static int rtp_write_header(AVFormatContext *s1)
         break;
     case CODEC_ID_H264:
         /* check for H.264 MP4 syntax */
-        if (st->codec->extradata_size > 0 && st->codec->extradata &&
-            st->codec->extradata[0] == 1) {
+        if (st->codec->extradata_size > 4 && st->codec->extradata[0] == 1) {
             s->nal_length_size = (st->codec->extradata[4] & 0x03) + 1;
         }
         break;