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mpeg12enc: use sign_extend() function

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-10-08 12:56:54 +01:00
parent 60f10e0ad3
commit 2f329db90e
1 changed files with 2 additions and 2 deletions
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4
libavcodec/mpeg12enc.c
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@ -27,6 +27,7 @@
#include "avcodec.h"
#include "dsputil.h"
#include "mathops.h"
#include "mpegvideo.h"
#include "mpeg12.h"
@ -690,8 +691,7 @@ static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
int bit_size = f_or_b_code - 1;
int range = 1 << bit_size;
/* modulo encoding */
int l= INT_BIT - 5 - bit_size;
val= (val<<l)>>l;
val = sign_extend(val, 5 + bit_size);
if (val >= 0) {
val--;