From 2efcf292750a1bc99ae65912ee6987995314c809 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Wed, 6 Jan 2010 22:40:52 +0000
Subject: [PATCH] Stop the approximation in bessel() once it does no longer
 improve. This is faster.

Originally committed as revision 21038 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/resample2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/resample2.c b/libavcodec/resample2.c
index 31d2be7ded..52769836e0 100644
--- a/libavcodec/resample2.c
+++ b/libavcodec/resample2.c
@@ -76,11 +76,13 @@ typedef struct AVResampleContext{
  */
 static double bessel(double x){
     double v=1;
+    double lastv=0;
     double t=1;
     int i;
 
     x= x*x/4;
-    for(i=1; i<50; i++){
+    for(i=1; v != lastv; i++){
+        lastv=v;
         t *= x/(i*i);
         v += t;
     }