[FFmpeg-devel] [PATCH] vulkan: fix host copy stride (PR #21073)

[averne via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21073 opened by averne
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21073
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21073.patch

memoryRowLength is is texels, not bytes


>From 1e90047fe6dae4abf19351d678819bd29b41be0e Mon Sep 17 00:00:00 2001
From: averne <averne381@gmail.com>
Date: Mon, 1 Dec 2025 15:40:40 +0100
Subject: [PATCH] vulkan: fix host copy stride

memoryRowLength is is texels, not bytes
---
 libavutil/hwcontext_vulkan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavutil/hwcontext_vulkan.c b/libavutil/hwcontext_vulkan.c
index c3322bafbd..89bf39bb3f 100644
--- a/libavutil/hwcontext_vulkan.c
+++ b/libavutil/hwcontext_vulkan.c
@@ -4382,6 +4382,7 @@ static int vulkan_transfer_host(AVHWFramesContext *hwfc, AVFrame *hwf,
     FFVulkanFunctions *vk = &p->vkctx.vkfn;
 
     AVVkFrame *hwf_vk = (AVVkFrame *)hwf->data[0];
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(swf->format);
     const int planes = av_pix_fmt_count_planes(swf->format);
     const int nb_images = ff_vk_count_images(hwf_vk);
 
@@ -4474,7 +4475,7 @@ static int vulkan_transfer_host(AVHWFramesContext *hwfc, AVFrame *hwf,
             get_plane_wh(&p_w, &p_h, swf->format, swf->width, swf->height, i);
 
             region_info.pHostPointer = swf->data[i];
-            region_info.memoryRowLength = swf->linesize[i];
+            region_info.memoryRowLength = swf->linesize[i] / desc->comp[i].step;
             region_info.imageSubresource.aspectMask = ff_vk_aspect_flag(hwf, i);
             region_info.imageExtent = (VkExtent3D){ p_w, p_h, 1 };
             copy_info.srcImage = hwf_vk->img[img_idx];
-- 
2.49.1

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