From f080a7bd90bd093820156d2eefcad027f7139ea1 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sat, 4 Oct 2008 21:57:01 +0000
Subject: [PATCH] Factorize stream id parsing.

Originally committed as revision 15556 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/avidec.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index c9c27e262d..1a9a11c439 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -614,6 +614,15 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     return 0;
 }
 
+static int get_stream_idx(int *d){
+    if(    d[0] >= '0' && d[0] <= '9'
+        && d[1] >= '0' && d[1] <= '9'){
+        return (d[0] - '0') * 10 + (d[1] - '0');
+    }else{
+        return 100; //invalid stream ID
+    }
+}
+
 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     AVIContext *avi = s->priv_data;
@@ -756,12 +765,7 @@ resync:
 
         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
 
-        if(    d[2] >= '0' && d[2] <= '9'
-            && d[3] >= '0' && d[3] <= '9'){
-            n= (d[2] - '0') * 10 + (d[3] - '0');
-        }else{
-            n= 100; //invalid stream id
-        }
+        n= get_stream_idx(d+2);
 //av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
         if(i + size > avi->fsize || d[0]<0)
             continue;
@@ -776,12 +780,7 @@ resync:
             goto resync;
         }
 
-        if(    d[0] >= '0' && d[0] <= '9'
-            && d[1] >= '0' && d[1] <= '9'){
-            n= (d[0] - '0') * 10 + (d[1] - '0');
-        }else{
-            n= 100; //invalid stream ID
-        }
+        n= get_stream_idx(d);
 
         //parse ##dc/##wb
         if(n < s->nb_streams){