[pjsip] jitter buffer - missing frame or zero (empty) frame?

[yyy]

Anshuman S. Rawat <arawat <at> 3clogic.com> writes:

> 
> Hi,
> 
> I have query regarding the frame type returned by pjmedia_jbuf_get_frame2(). 
> For a particular application I am developing, I want to know precisely 
> whether an incoming media (audio) frame is lost or delayed (such that it has 
> to be dropped) and I want this information just about when frames are being 
> played out (i.e. after jitter buffer processing). For this I was using frame 
> type returned from jitter buffer as an indicator i.e.if frame type is 
> PJMEDIA_JB_MISSING_FRAME, frame is considered lost or dropped.
> 
> However, I noticed from logs that when frames are lost (I physically "broke" 
> the network connection), frame type shows up as PJMEDIA_JB_ZERO_EMPTY_FRAME 
> and not PJMEDIA_JB_MISSING_FRAME.
> 
> Could some one throw some more light on this? or have a different way to do 
> this?
> 
> Thanks,
> Anshuman 
> 
> 
Hi,

As I understand it PJMEDIA_JB_MISSING_FRAME is for when there is gap in the
received frame sequence numbers, i.e. if frames 1,2,4,5 are received, frame 3 is
missing. PJMEDIA_JB_ZERO_EMPTY_FRAME is when the jitter buffer has run empty.

Yann