Can pl_vulkan_hold_ex explicitly sync the imported dmabuf resource?

[langyuxf]

Should the exporter(e.g., vaExportSurfaceHandle) make sure the exported resource is synced?

[haasn]

In principle, you can use pl_vulkan_sem_create to export a semaphore which you can then import into foreign APIs (e.g. cuda/nvdec), and use it for non-blocking synchronization. But to my knowledge, there is no way to import semaphores in vaapi, so this path is not possible. In mpv, we use vaSyncSurface to synchronize the surface explicitly before passing it to libplacebo.

[langyuxf]

"In mpv, we use vaSyncSurface to synchronize the surface explicitly before passing it to libplacebo."

Yes, but if the consumer is OpenGL which is implicitly synced, vaSyncSurface will introduce some overheads.

I'm trying to remove vaSyncSurface in mpv, use https://docs.kernel.org/driver-api/dma-buf.html#c.dma_buf_export_sync_file
for Vulkan.