Hello,
When using the stereo L16 codec the loss_period statistics are double the
expected value. It seems that the rtcp rx/tx loss_period and xr gap/burst
duration calculations are only correct when a stream consists of one channel and
not two or more.
The RTCP session member variable pkt_size is at the source of the incorrect
results: samples_per_frame would need to be divided by the number of channels,
or else instead of passing samples_per_frame to pjmedia_rtcp_init, ptime could
be passed in instead.
in rtpc.c:
in pjmedia_rtcp_init():
sess->pkt_size = samples_per_frame;
in pjmedia_rtcp_xr_init():
session->ptime = session->rtcp_session->pkt_size * 1000 /
session->rtcp_session->clock_rate;
in pjmedia_rtcp_rx_rtp2():
period = count * sess->pkt_size * 1000 / sess->clock_rate;
and pjmedia_rtcp_rx_rtcp():
period = (sess->stat.tx.loss - last_loss) * sess->pkt_size *
1000 / sess->clock_rate;
Cheers,
Yann
