From e457023a95e449ac2c80a49256f0611d5a8fffff Mon Sep 17 00:00:00 2001
From: Marco Gerards <mgerards@xs4all.nl>
Date: Tue, 10 Apr 2007 08:18:04 +0000
Subject: [PATCH] Fix an underflow/overflow that was causing some crackles when
 playing certain THP files. patch by Marco Gerards, mgerards xs4all nl

Originally committed as revision 8703 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/adpcm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index d02ccfb9f2..57281d137a 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -1359,8 +1359,10 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
                     if(n&1) sampledat=  *src++    <<28;
                     else    sampledat= (*src&0xF0)<<24;
 
-                    *samples = ((prev[ch][0]*factor1
+                    sampledat = ((prev[ch][0]*factor1
                                 + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);
+                    CLAMP_TO_SHORT(sampledat);
+                    *samples = sampledat;
                     prev[ch][1] = prev[ch][0];
                     prev[ch][0] = *samples++;