AM62A7: associate arbitrary user data with vpac image buffer

T S

Part Number: AM62A7

Tool/software:

i have an application with the following data flow:
V4L->VISS->LDC->MSC

is there a way to
* associate the image buffer received from V4L with an arbitrary scalar/pointer,
* have that data propagate along the buffer chain to the MSC output buf (where the application will query it)

iiuc tivxSetReferenceAttribute(TIVX_REFERENCE_TIMESTAMP) has similar functionality, is there a user data equivalent?

over 1 year ago

0 Jianzhong Xu over 1 year ago

TI__Guru 60075 points

Hi Tomer,

I do not think that is possible. What were you trying to do, adding some meta data to the V4L2 buffer and retrieving it after all the processing?

I'll let Rahul Ravikumar comment further.

Thanks,

Jianzhong

0 T S over 1 year ago in reply to Jianzhong Xu

Prodigy 60 points

alternatively,
instead of setting our own arbitrary user data,
if there's some TI attribute we can query from MSC output buffer and from the V4L buffer that will tell us one is based on the other, that would be helpful as well.

0 Rahul Ravikumar over 1 year ago in reply to T S

TI__Expert 4349 points

Hi Tomer,

I guess you can use TIVX_REFERENCE_TIMESTAMP itself
Do you see any problem with that?

Regards
Rahul T R

0 T S over 1 year ago in reply to Rahul Ravikumar

Prodigy 60 points

i was hoping to use both TIVX_REFERENCE_TIMESTAMP and an extra user data pointer.
i understand from you answers that's not possible.

one last question about this -
is TIVX_REFERENCE_TIMESTAMP ever written or read by any TI code? or is it purely for user use?

+1 Rahul Ravikumar over 1 year ago in reply to T S

TI__Expert 4349 points

Hi Tomer,

TIVX_REFERENCE_TIMESTAMP is not initialized by the framework
It can be set by the user for the input buffers

All OpenVX kernels propagates these values from input buffers to output buffers
So, you read the timestamps from the output buffers and match it with input

Regards
Rahul T R

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AM62A7: associate arbitrary user data with vpac image buffer