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rtpmanager: improve performance in NACK/RTX handling

Miguel París Díaz requested to merge mparisdiaz/gst-plugins-good:rtpmanager_improve_rtx_performance into master

Hello,
I am providing several changes to improve NACK/RTX handling.
The general remarks are:

  • Add GstRTPRetransmissionListRequest that allows send a list of seqnum to ask for NACKS. avoiding sending a lot of events on packet looses bursts.
  • GstRtpRtxQueue: several changes to avoid unnecessary operations.
  • Add "rtt" field in both GstRTPRetransmissionRequest and GstRTPRetransmissionListRequest that allows upstream elements like GstRtpRtxQueue to send retransmissions under the RTT.

Anyway, each commit has more detailed info.

Related to #411

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