[AG-DEV] UCL common lib rtp_recv & frame timing

[Rhys Hawkins]

On Tue, 27 Jul 2010 14:12:37 -0400
Andrew Ford <andrew.ford at rit.edu> wrote:

> 
>   timeout.tv_sec = 0;
>   timeout.tv_usec = 10000;
>   for (int i = 0; i < 1000 && rtp_recv(session, &timeout, _timestamp); i ++) {
> 
> 
>     timeout.tv_sec = 0;
>     timeout.tv_usec = 10;
> 
>   }				
> 

Hi Andrew,

All that code is doing is a crude version of:
  
  while (elapsed_time < 10ms) {
    process incoming packets
  }

You could try and replace the for loop with just one call to the rtp_recv
function, ie:

  timeout.tv_sec = 0;
  timeout.tv_usec = 10000;
  rtp_recv(session, &timeout, _timestamp);

and see if that fixes your problem.

The code above was to handle an issue with DV decoding in that decoding an 
entire frame of DV took a certain length of time and during that time the
UDP buffer (kernel side) could overflow causing loss of data. I don't think
it should be the cause of your problems, but things are pretty foggy that
far back in time so it may have other ramifications I've forgotten about.

Cheers,
    Rhys