Hi, 2014-07-24 19:45 GMT+02:00 Steven Toth <st...@kernellabs.com>: > I'd like my application to allocate buffers (not DRM_PRIME or > KERNEL_PRIME) and use each of these for a surface, passing the > allocation by reference during CreateSurface. I've seen various > examples (below) of projects that demonstrate the use of > VASurfaceAttribExternalBuffers but nothing that creates via user > allocated pointers. > > Based on reading the intel driver internals, I'm starting to think my > goal isn't currently possible. > > Looking at the intel-driver project, function i965_CreateSurfaces2... > > If you pass VA_SURFACE_ATTRIB_MEM_TYPE_VA it appears as if the i965 > driver allocates the surface memory internally via > i965_surface_native_memory() > > If you pass VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME or > VA_SURFACE_ATTRIB_MEM_TYPE_KERNEL_DRM it appears as if the i965 driver > uses external surfaces via i965_suface_external_memory(), but not user > pointers, only I965_SURFACE_MEM_GEM_FLINK or > I965_SURFACE_MEM_DRM_PRIME. > > The only i965 driver attempt to query the > VASurfaceAttribExternalBuffers->num_buffers/buffers member is inside > i965_suface_external_memory(). > > Have I missed something important, or is this simply not possible? > > I assume DRM_PRIME or KERNEL_PRIME handles don't permit the use of > user allocated pointers. Correct?
Correct. On the VA-API side, what you want is userptr support (VA_SURFACE_ATTRIB_MEM_TYPE_USER_PTR). However, this comes with restrictions on the driver side, and requires additional kernel patches (vmap). What specific use-cases do you want to support? Regards, Gwenole. _______________________________________________ Libva mailing list Libva@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/libva
