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avutil/hwcontext_cuda: fix yuv420p V/U plane overlap in cuda_get_buffer()

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Odd-height yuv420p result in incorrect calculations of the U-plane
address offset. The last row of the V-plane overlapped with and was
overwritten by the first row of the U-plane, leading to chroma artifacts.

```
ffmpeg -init_hw_device cuda=cu -filter_hw_device cu -f lavfi -i \
testsrc=s=1920x1081,format=yuv420p -vf hwupload -c:v hevc_nvenc \
-vframes 1 -y <OUTPUT>
```

Signed-off-by: nyanmisaka <nst799610810@gmail.com>
(cherry picked from commit 3f6bf150cb)
Signed-off-by: Marvin Scholz <epirat07@gmail.com>
This commit is contained in:
nyanmisaka
2026-06-29 15:32:00 +08:00
committed by Marvin Scholz
parent 901a25e0d1
commit a508495cd7
1 changed files with 1 additions and 1 deletions
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2
libavutil/hwcontext_cuda.c
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@@ -209,7 +209,7 @@ static int cuda_get_buffer(AVHWFramesContext *ctx, AVFrame *frame)
if (ctx->sw_format == AV_PIX_FMT_YUV420P) {
frame->linesize[1] = frame->linesize[2] = frame->linesize[0] / 2;
frame->data[2] = frame->data[1];
frame->data[1] = frame->data[2] + frame->linesize[2] * (ctx->height / 2);
frame->data[1] = frame->data[2] + frame->linesize[2] * AV_CEIL_RSHIFT(ctx->height, 1);
}
frame->format = AV_PIX_FMT_CUDA;