[Linphone-developers] G722

[Vadim Lebedev]

Hello,

We've a following interop problem with G722 codec:

Because of historical reasons the relevant RTP RFC   speicifies that 
when using G722 payload
RTP TIMESTAMP should be incremented with 8KHZ frequency  even if the 
REAL sampling rate
is 16KHZ.

As you understand msrtp.c filter is unable to handle this situation,
so we've been thinking about possible enchancements.

One idea that comes to mind is to add a 'rtp_rate'  field to Payloadtype 
structure , and if it is non zero and different from sampling rate to 
compute adjustement (divider or multiplier) to rtp time stamp.

Any comments on this approach?


Thanks
Vadim