Skip to content

Instantly share code, notes, and snippets.

@mildred

mildred/README.md

Last active February 23, 2017 11:58
Show Gist options
  • Save mildred/95cb25d42852e76fc136 to your computer and use it in GitHub Desktop.
Save mildred/95cb25d42852e76fc136 to your computer and use it in GitHub Desktop.
Download ZIP
Listen to Pulseaudio RTP stream using gstreamer
Raw
README.md

This ought to be in the wiki

The command line is :

gst-launch-1.0 udpsrc address=224.0.0.56 port=46194 caps="application/x-rtp, media=audio, payload=10, clock-rate=44100" ! .recv_rtp_sink_0 rtpbin ! rtpL16depay ! audioconvert ! audioresample ! alsasink device=hw:0,0

gst-launch-1.0 udpsrc address=224.0.0.56 port=45678 caps="application/x-rtp, media=audio, payload=10, clock-rate=44100" ! .recv_rtp_sink_0 rtpbin ! rtpL16depay ! audioconvert ! audioresample ! alsasink device=hw:1,0

Of course, you adjust the sink how you want and update the port number according to the method given on the above page of the wiki (tcpdump -n net 224.0.0.0/8 -c 10).

Now, how does this pipeline works:

  • udpsrc will listen to the multicast address on the given UDP port (that you have to configure)
  • You have to tell what kind of stream it is (the caps). I found playing the stream using VLC that it was PCM 16bits stereo audio. Looking up RTP constants on the IANA website I found that this corresponded to the stream type 10 (The L16 codec of RFC 3551).
  • rtpbin will manage the rtp session and output a rtp stream
  • rtpL16depay will decode PCM audio and output an audio stream
  • you can do what you want from this point on

References:

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment