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TDA4VM: Some questions about openvx pipeline when using "vx_object_array".

fengjie hu
Prodigy 120 points
Part Number: TDA4VM


Hi, Brijesh.

{
vx_image out_img = vxCreateImage(context, width, heig.ht, VX_DF_IMAGE_NV12);
scalerObj->output[0].arr = vxCreateObjectArray(context, (vx_reference)out_img, 4);
scalerObj->output[1].arr = vxCreateObjectArray(context, (vx_reference)out_img, 4);

output0 = (vx_image)vxGetObjectArrayItem((vx_object_array)scalerObj->output[0].arr, 0);
output1 = (vx_image)vxGetObjectArrayItem((vx_object_array)scalerObj->output[1].arr, 0);
scalerObj->node = tivxVpacMscScaleNode(graph, input,output0,output1, NULL,NULL,NULL);
}

tivxSetNodeParameterNumBufByIndex(scalerObj->node, 1, 2);
tivxSetNodeParameterNumBufByIndex(scalerObj->node, 1, 3);
The Scaler node output[0] is objectArray, it has 4 channels, then we set the output[0]'s buffer number to 2 by tivxSetNodeParameterNumBufByIndex.
 My question is  what dose the output[0] buffer number 2 means? does it mean we have 2 objectArray or we only have 2 object(vx_image)?
 


  • 0
    TI__Guru**** 484275 points

    Hi,

    it would be two object arrays, Because framework knows that the output0 is part of the object array, so it would create two instance of the object array.

    Btw, why are you calling it two times? 

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Prodigy 120 points

    Thanks Brijesh..

    I create two scaler output because I need two  resolutions from scaler node...

    few more questions to ask:

    If a node in pipeline has object_array as output, if i use "vxGraphParameterDequeueDoneRef" to deque the output, dose it deque all the channels data in the object_array, or it only deque one channel data in the object_array?  if I use "vxGraphParameterEnqueueReadyRef" to enque the "empty" output, does it enque all the channels data to object_array?

  • +1 in reply to fengjie hu
    TI__Guru**** 484275 points

    Hi fenbgjie hu,

    fengjie hu said:

    I create two scaler output because I need two  resolutions from scaler node...

    But it looks like you are using same output index in both the below calls.

    tivxSetNodeParameterNumBufByIndex(scalerObj->node, 1, 2);
    tivxSetNodeParameterNumBufByIndex(scalerObj->node, 1, 3);
    fengjie hu said:
    If a node in pipeline has object_array as output, if i use "vxGraphParameterDequeueDoneRef" to deque the output, dose it deque all the channels data in the object_array, or it only deque one channel data in the object_array?  if I use "vxGraphParameterEnqueueReadyRef" to enque the "empty" output, does it enque all the channels data to object_array?

    No, Dequeue will just give your one of the element of the object array, if you want all elements, then you need to get parent object array from the dequeued image object using tivxGetReferenceParent API and then from the parent object array, you could get access to all the other image objects using vxGetObjectArrayItem API.

    Regards,

    Brijesh