rtprtxreceive: add ssrc-map property
Mirroring the rtxsend, this allows the application to "pre-map" the retransmission-ssrcs to the "real" ssrc, if this information is known.
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Mirroring the rtxsend, this allows the application to "pre-map" the retransmission-ssrcs to the "real" ssrc, if this information is known.