lavfi/blockdetect: Fix possible div by 0

Found-by Covererity, CID 1504568, 1504569
3 years ago · b7cea55730
parent 11912f65ef
commit b7cea55730
1 changed files with 4 additions and 0 deletions
--- a/libavfilter/vf_blockdetect.c
+++ b/libavfilter/vf_blockdetect.c
@ -132,8 +132,10 @@ static float calculate_blockiness(BLKContext *s, int w, int h,
                nonblock_count++;
            }
        }
+        if (block_count && nonblock_count) {
        temp = (block / block_count) / (nonblock / nonblock_count);
        ret = FFMAX(ret, temp);
+        }
    }

    // vertical blockiness (fixed height)
@ -175,8 +177,10 @@ static float calculate_blockiness(BLKContext *s, int w, int h,
                nonblock_count++;
            }
        }
+        if (block_count && nonblock_count) {
        temp = (block / block_count) / (nonblock / nonblock_count);
        ret = FFMAX(ret, temp);
+        }
    }

    // return highest value of horz||vert