tree 08673913a4e6ae3c007f16c380aed08530822330
parent d62419b574f7002b1c857d9e2df72a95daca36f1
author Jacob Erlbeck <jerlbeck@sysmocom.de> 1385389415 +0100
committer Holger Hans Peter Freyther <holger@moiji-mobile.com> 1385400650 +0100

mgcp/rtp: Fix timestamp offset when patching RTP packets

The current implementation increments the seqno but does not increment
the RTP timestamp, leading to two identical timestamps following one
after the other.

This patch fixes this by adding the computed tsdelta when the offset
is calulated. In the unlikely case, that a tsdelta hasn't been
computed yet when the SSRC changes, a tsdelta is computed based on
the RTP rate and a RTP packet duration of 20ms (one speech frame per
channel and packet). If the RTP rate is not known, a rate of 8000 is
assumed.

Note that this approach presumes, that the per RTP packet duration
(in samples) is the same for the last two packets of the stream being
replaced (the first one).

Sponsored-by: On-Waves ehf