[FFmpeg-cvslog] avfilter/vf_elbg: Use unsigned for shifting into the top bit

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Jul  8 00:45:45 2024 +0200| [2af95b9214a6bf75f946440d36c349963396e23b] | committer: Michael Niedermayer

avfilter/vf_elbg: Use unsigned for shifting into the top bit

Fixes: part of CID1355110 Overflowed constant

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2af95b9214a6bf75f946440d36c349963396e23b
---

 libavfilter/vf_elbg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_elbg.c b/libavfilter/vf_elbg.c
index 732a2c8abf..dd22da07b6 100644
--- a/libavfilter/vf_elbg.c
+++ b/libavfilter/vf_elbg.c
@@ -195,7 +195,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
         p0 = (uint8_t *)out->data[0];
 
         for (i = 0; i < elbg->codebook_length; i++) {
-            const int al =  elbg->use_alpha ? elbg->codebook[i*4+3] : 0xff;
+            const unsigned al =  elbg->use_alpha ? elbg->codebook[i*4+3] : 0xff;
             pal[i] =  al                    << 24  |
                      (elbg->codebook[i*4+2] << 16) |
                      (elbg->codebook[i*4+1] <<  8) |