From c675ef70253bdb8ad44d71198ff98be5474b85ee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20=C3=96man?= <andreas@lonelycoder.com>
Date: Mon, 21 Apr 2008 15:20:53 +0000
Subject: Compute AC3 frame CRC for stronger raw AC3 format probing.

Closes issue64.

Originally committed as revision 12920 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/raw.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'libavformat')

diff --git a/libavformat/raw.c b/libavformat/raw.c
index c860b7f54e..5c188dc92b 100644
--- a/libavformat/raw.c
+++ b/libavformat/raw.c
@@ -22,6 +22,7 @@
 #include "avformat.h"
 #include "ac3_parser.h"
 #include "raw.h"
+#include "crc.h"
 
 #ifdef CONFIG_MUXERS
 /* simple formats */
@@ -429,6 +430,9 @@ static int ac3_probe(AVProbeData *p)
         for(frames = 0; buf2 < end; frames++) {
             if(ff_ac3_parse_header(buf2, &hdr) < 0)
                 break;
+            if(buf2 + hdr.frame_size > end ||
+               av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf2 + 2, hdr.frame_size - 2))
+                break;
             buf2 += hdr.frame_size;
         }
         max_frames = FFMAX(max_frames, frames);
-- 
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