Getting a callback after n buffers

[lourman]

Hi,

 I am using the 1427 PCIe card and I am writting a code in c++.

I am just wondering if there is a way to have a callback after a specific number of buffers are filled up rather than in every buffer.

I have a ring setup and I want every 1600 frames to have a callback to get these frames and manipulate them while it continues to acquire and fill up the other buffers.   

Is there a simple way to get this done?

Thanks

Alex

[Ian Colman]

Hi Alex,

I'm afraid I don't think there is a specific function that will callback when x number of buffers are full. Can I have a little more information on your problem so I can suggest an alternative approach? Specifically what type of buffer are you filling?

Regards,

Ian C.
Applications Engineer
National Instruments UK & Ireland

[odedbd]

Hi Alex,

Have you found a good way to do the n-buffers callback? My solution for a similar probelm was using a "multimedia timer" to check for the position in the ring ever few millisecs, but I'm not very happy with the result. I'd love to hear of a better way to do this.

Thanks,
Oded.

[lourman]

well the best way that I have found is this, which works nicely for the moment:

imgSessionExamineBuffer(Sid, IMG_CURRENT_BUFFER, &real_index, &buffAddr);

start_frames = real_index + nframes;

imgSessionReleaseBuffer(Sid);

for(int j = 0; j < nframes; j++)

{

imgSessionExamineBuffer(Sid, start_frames, &real_index, &buffAddr);

for (int i=0;i<2048;i++) data[i + 2048*j] = ((unsigned short*)buffAddr)[i];

start_frames++;

imgSessionReleaseBuffer(Sid);

}

Alex