how to stream multichannel PCM audio, channel count > 2 ???

[Charlie Laub]

I have been using gstreamer to stream PCM stereo audio over UDP, payloaded
as 16 or 24 bit RTP packets (rtpL16pay, rtpL24pay). I recently embarked on
an effort to expand my testing to multichannel audio, but have run into a
problem.

 

It seems that rtpL16pay and rtpL24pay cannot payload more than 2 channels of
audio. If I feed more than 2 channel audio into these payloaders, they give
a warning and then try to send 2 channel audio, which is garbage on the
receiving end.

 

My goal is to be able to stream an arbitrary (but modest) number of
uncompressed audio channels over a local area network. How can I do that
with gstreamer?

 

One possibility I discovered uses the element rtpmux. Since all my audio
streams will be at the same rate, I could mux separate 2-channel rtp streams
together using rtpmux. This seems like a bit of a kludge. but perhaps that
is the only way??? Has anyone tried that?

 

If there is a better or known way to send multichannel audio over RTP under
gstreamer (gst-launch only please) I would be very interested in some tips
about it.

 

-Charlie

 

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