RTP and RTCP are different protocols, but which work together. RTP packets
deliver the media data. RTCP is used (in the reverse direction) to
monitor/report the quality of the RTP stream (including reporting packet loss
rates). Also, if you have separate RTP streams for audio and video, then RTCP
(in the forward direction) is used to provide time synchronization between them.
For more information about the purpose of RTCP, see
https://www.rfc-editor.org/rfc/rfc3550.html#section-6
and
https://en.wikipedia.org/wiki/RTP_Control_Protocol
Although you should implement RTCP as well as RTP, RTCP can probably be omitted
if - as in your case - you have just a single media stream (in your case, just
audio). But implementing RTCP is very easy; just call
RTCPInstance::createNew()
as we do in the demo applications (e.g., “testMP3Receiver” and
“testAMRAudioStreamer”), and RTCP packets will be sent/received automatically
by our code.
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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