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avfilter/vf_blurdetect: fix uninitialized variables and possible div by zero

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Found-by: Coverity
This commit is contained in:
Thilo Borgmann 2022-04-27 11:37:12 +02:00
parent 39f22df6cd
commit 79286d3eb6
1 changed files with 2 additions and 1 deletions
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3
libavfilter/vf_blurdetect.c
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@ -138,6 +138,7 @@ static float edge_width(BLRContext *blr, int i, int j, int8_t dir, int w, int h,
case DIRECTION_VERTICAL: dX = 0; dY = 1; break; case DIRECTION_VERTICAL: dX = 0; dY = 1; break;
case DIRECTION_45UP: dX = 1; dY = -1; break; case DIRECTION_45UP: dX = 1; dY = -1; break;
case DIRECTION_45DOWN: dX = 1; dY = 1; break; case DIRECTION_45DOWN: dX = 1; dY = 1; break;
default: dX = 1; dY = 1; break;
} }
// determines if search in direction dX/dY is looking for a maximum or minimum // determines if search in direction dX/dY is looking for a maximum or minimum
@ -227,7 +228,7 @@ static float calculate_blur(BLRContext *s, int w, int h, int hsub, int vsub,
} }
} }
// if not enough edge pixels in a block, consider it smooth // if not enough edge pixels in a block, consider it smooth
if (block_total_width >= 2) { if (block_total_width >= 2 && block_count) {
blks[blkcnt] = block_total_width / block_count; blks[blkcnt] = block_total_width / block_count;
blkcnt++; blkcnt++;
} }