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avfilter/vf_xpsnr: avoid a zero block size on small frames

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Fixes: division by zero
Fixes: SUcVEyk7r3Gc
Found-by: Kenan Alghythee <kalghy2@uic.edu>
This commit is contained in:
Kenan Alghythee
2026-07-11 16:53:41 +02:00
committed by michaelni
parent e2bc6d88cd
commit 06fd4fd0e7
1 changed files with 2 additions and 2 deletions
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4
libavfilter/vf_xpsnr.c
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@@ -273,7 +273,7 @@ static int get_wsse(AVFilterContext *ctx, int16_t **org, int16_t *org_m1,
const uint32_t w = s->plane_width [0]; /* luma image width in pixels */
const uint32_t h = s->plane_height[0];/* luma image height in pixels */
const double r = (double)(w * h) / (3840.0 * 2160.0); /* UHD ratio */
const uint32_t b = FFMAX(0, 4 * (int32_t) (32.0 * sqrt(r) +
const uint32_t b = FFMAX(1, 4 * (int32_t) (32.0 * sqrt(r) +
0.5)); /* block size, integer multiple of 4 for SIMD */
const uint32_t w_blk = (w + b - 1) / b; /* luma width in units of blocks */
const double avg_act = sqrt(16.0 * (double) (1 << (2 * s->depth - 9)) / sqrt(FFMAX(0.00001,
@@ -399,7 +399,7 @@ static int do_xpsnr(FFFrameSync *fs)
XPSNRContext *const s = ctx->priv;
const uint32_t w = s->plane_width [0]; /* luma image width in pixels */
const uint32_t h = s->plane_height[0]; /* luma image height in pixels */
const uint32_t b = FFMAX(0, 4 * (int32_t) (32.0 * sqrt((double) (w * h) / (3840.0 * 2160.0)) + 0.5)); /* block size */
const uint32_t b = FFMAX(1, 4 * (int32_t) (32.0 * sqrt((double) (w * h) / (3840.0 * 2160.0)) + 0.5)); /* block size */
const uint32_t w_blk = (w + b - 1) / b; /* luma width in units of blocks */
const uint32_t h_blk = (h + b - 1) / b; /* luma height in units of blocks */
AVFrame *master, *ref = NULL;