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avfilter/vf_codecview: Clamp block to the visible frame region

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Fixes: write into the padding area of the frame

Found-by: Marius Momeu <marius.momeu@berkeley.edu>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-05-02 12:22:34 +02:00
committed by michaelni
parent 2a991a3475
commit c568f40597
1 changed files with 15 additions and 2 deletions
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libavfilter/vf_codecview.c
+15 -2
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@@ -266,9 +266,22 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
if (par->nb_blocks) {
for (int block_idx = 0; block_idx < par->nb_blocks; block_idx++) {
AVVideoBlockParams *b = av_video_enc_params_block(par, block_idx);
uint8_t *buf = frame->data[0] + b->src_y * stride;
draw_block_rectangle(buf, b->src_x, b->src_y, b->w, b->h, stride, 100);
int64_t x0 = b->src_x;
int64_t y0 = b->src_y;
int64_t x1 = x0 + b->w;
int64_t y1 = y0 + b->h;
x0 = FFMAX(x0, 0);
y0 = FFMAX(y0, 0);
x1 = FFMIN(x1, frame->width);
y1 = FFMIN(y1, frame->height);
if (x1 <= x0 || y1 <= y0)
continue;
uint8_t *buf = frame->data[0] + y0 * stride;
draw_block_rectangle(buf, x0, y0, x1-x0, y1-y0, stride, 100);
}
}
}