TDA4AL-Q1: [IFV700] Get time stamp of each frame

Hi Dinesh,

Do you mean the processing time for the frame? As such, VISS node captures the processing time for each frame and uses it for internal reporting. But it is not available in the application. Also do you want to get for each frame? This can be additional IPC communication on R5F to get the timestamp on application layer. 

Regards,

Brijesh 

Hello Brijesh,

Thanks for reply.

Can you point any ready reference for such IPC between cores please?

Hi Dinesh,

There are PDK examples for IPC between cores, but i guess you are planning to use OpenVX framework, isn't it? 

In this case, could you help us understand why you require per frame processing time?

Regards,

Brijesh

Hello Brijesh,

yes correct, we are using openvx.

actually we want to get timestamp of the current raw frame coming from camera. Such time stamp is already been extracted in a target kernel from embedded data of current frame. 

we need frame timestamp in vision app running on A72 core.

for above use case request your implementation suggests please. 

Dinesh Badkas said:

actually we want to get timestamp of the current raw frame coming from camera. Such time stamp is already been extracted in a target kernel from embedded data of current frame. 

Do you mean the timestamp present in the embedded data of the captured frame? and you can extract in the capture node? 

I guess you already are using capture node's output as graph parameter, probably, you can add another variable in the raw_image and then can extract it in the application, without any additional IPC. Once the variable is added in the raw_image, you can put the extracted timestamp in it in the capture node and then once the buffer is dequeued, you can call QueryAttribute to get this variable value in the application. 

Regards,

Brijesh