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J721S2XSOMXEVM: vxObjectArray with existing vx_reference

Juhyun Kim
Prodigy 240 points
Part Number: J721S2XSOMXEVM


Tool/software:

Hello Ti experts,

Is there any way to map or assign already existing vx_reference to vxObjectArray?

Or If possible, even a way to create vxObjectArray with exsting vx_reference would be okay.

Regards,

Juhyun

  • 0
    TI__Genius 16860 points

    Hi Kim,

      Create object array from the meta data of the reference, using createObjectarray api and then get reference of element from the object array using vxGetObjectArrayItem api and then depending on the reference type use map or copy api to assign the existing reference.

    Regards,

    Gokul

  • 0 in reply to Gokul S
    Prodigy 240 points

    Hi Gokul,

    Thanks for the answer.

    So if the type is vx_image or vx_tensor, then how should I map or assign existing vx_reference to vxObjectArray via the element fetched by vxGetObjectArrayItem?

    And the copy for the assign should be shallow, not deep copy.

    Regards,

    Juhyun

  • 0 in reply to Juhyun Kim
    TI__Genius 16860 points

    Hi Kim,

      Can you elaborate on shallow copy ?


    Regards,

    Gokul

  • 0 in reply to Gokul S
    Prodigy 240 points

    I meant shallow copy as general terminology that means copying only meta data and buffer pointer, which doesn't involve actual memory copy of the buffer.

    Usually we use that with pointer assignment as you know.

    Regards,

    Juhyun

  • +1 in reply to Juhyun Kim
    TI__Genius 16860 points

    Hi Juhyun,

      Thanks for the reply.
      Use the element as dst and the existing reference as src in the following code snippet,

    vx_status copyImageHandles(vx_image src, vx_image dst)
{
    vx_status status = VX_SUCCESS;
    void           *addr[TIVX_IMAGE_MAX_PLANES] = {NULL};
    uint32_t        size[TIVX_IMAGE_MAX_PLANES];
    uint32_t        num_entries;

    status = tivxReferenceExportHandle((vx_reference)src,
                                         addr,
                                         size,
                                         max_entries,
                                         &num_entries);

    if(status==VX_SUCCESS)
    {
        status = tivxReferenceImportHandle((vx_reference)dst,
                                           (const void **)addr,
                                           (const uint32_t *)size,
                                           num_entries);
    }

    return status;
}

    this will work if dst is already allocated (either by vxMapImagePatch or vxVerifyGraph).

    Regards,

    Gokul

  • 0 in reply to Gokul S
    Prodigy 240 points

    Hi Gokul,

    I appreciate the code snippet, I get the idea and will try it soon.

    Regards,

    Juhyun

  • 0 in reply to Gokul S
    Prodigy 240 points

    Hi Gokul,

    I tested the code you shared, and checked it worked as I expected.

    I appreciate your support, that's exactly what I wanted.

    Regards,

    Juhyun