isDtlsPacket

fnbool isDtlsPacket(ubyte firstByte) @safe pure nothrow @nogc

Demultiplexes DTLS and RTP/RTCP packets (RFC 5764 §5.1.2).

Examines the first byte to determine if a received packet is a DTLS record or an RTP/RTCP packet. Per RFC 5764 §5.1.2 the ranges are disjoint:

  • 20-63: DTLS (valid ContentType values)
  • 128-191: RTP/RTCP (version 2 with the padding bit clear/set)

    Parameters

    firstByteThe first byte of the received packet.

    Returns

    true if the packet is DTLS, false if it is RTP/RTCP.