From 5ac59c559b18c2585bae2dd29b77d2b38b7e3449 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 4 Jan 2004 14:43:52 +0000
Subject: [PATCH] warn the user if we had to clip some dct coefficient due to a
crappy format which doenst support the whole needed range (msmpeg4/wmv mostly
but mpeg1 too to a lesser extend)
Originally committed as revision 2661 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/mpegvideo.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 01e0d9930f8..827e2ad5b43 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -3140,6 +3140,7 @@ static inline void clip_coeffs(MpegEncContext *s, DCTELEM *block, int last_index
int i;
const int maxlevel= s->max_qcoeff;
const int minlevel= s->min_qcoeff;
+ int overflow=0;
if(s->mb_intra){
i=1; //skip clipping of intra dc
@@ -3150,11 +3151,19 @@ static inline void clip_coeffs(MpegEncContext *s, DCTELEM *block, int last_index
const int j= s->intra_scantable.permutated[i];
int level = block[j];
- if (level>maxlevel) level=maxlevel;
- else if(level<minlevel) level=minlevel;
-
+ if (level>maxlevel){
+ level=maxlevel;
+ overflow++;
+ }else if(level<minlevel){
+ level=minlevel;
+ overflow++;
+ }
+
block[j]= level;
}
+
+ if(overflow && s->avctx->mb_decision == FF_MB_DECISION_SIMPLE)
+ av_log(s->avctx, AV_LOG_INFO, "warning, cliping %d dct coefficents to %d..%d\n", overflow, minlevel, maxlevel);
}
#if 0
--
GitLab