Icecast - Jun 2020 - using Icecast source client as PulseAudio source

There are many Icecast source clients[1] available now.

The Coolmic[2] app is particularly interesting because it can turn a
Android phone (e.g. SmartLav+ lapel mic[3]) into a wearable mic for
presenters.

Not everybody is keen to run Icecast though, some people may want to
mix-and-match the Icecast source clients like that with some other
broadcasting platform, Jitsi Meet[4], Zoom or whatever.

Is there any documented way to make the Icecast source client appear as
a source in PulseAudio so that any arbitrary application can use the
sound feed as if it was a local microphone?  For example, has anybody
tried to do this with PulseAudio module-pipe-source[5] or
module-tunnel-source[6]?

We can already do stuff like this with video, for example, using the
v4l2loopback kernel module with gstreamer.  I provided a very trivial[7]
script for that and it would be interesting to have a parallel example
for audio.

Regards,

Daniel


1. https://icecast.org/apps/
2. https://coolmic.net/
3. https://www.rode.com/microphones/smartlav-plus
4. https://meet.jit.si
5.
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/#module-pipe-source
6.
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/#module-tunnel-source-new
7. https://gitlab.com/freertc/gstreamer-chroma-key

If you want to pick up the sound from the icecast server mount point
this should work:

gst-launch-1.0 -v souphttpsrc
location=https://mustafejen.se:8443/verket.opus ! decodebin ! pulsesink
device="sndio-sink"

In this case the audio is picked up from the icecast server, not
directly from the icecast source client.

If you want to pick up the audio within the source client itself maybe
it's possible with pulsesrc (related to pulsesink).

I don't know much about how Cool Mic works (even if I use it everyday)
but I have had occasional contact with Cool Mic developers and they were
real nice. My suggestion is that you look for the Cool Mic contact
information:

https://coolmic.net/contact/

Same goes for pulseaudio.

Regards,

Per Gunnarsson

On 2020-06-03 10:04, Daniel Pocock wrote:
> There are many Icecast source clients[1] available now.
>
> The Coolmic[2] app is particularly interesting because it can turn a
> Android phone (e.g. SmartLav+ lapel mic[3]) into a wearable mic for
> presenters.
>
> Not everybody is keen to run Icecast though, some people may want to
> mix-and-match the Icecast source clients like that with some other
> broadcasting platform, Jitsi Meet[4], Zoom or whatever.
>
> Is there any documented way to make the Icecast source client appear as
> a source in PulseAudio so that any arbitrary application can use the
> sound feed as if it was a local microphone?  For example, has anybody
> tried to do this with PulseAudio module-pipe-source[5] or
> module-tunnel-source[6]?
>
> We can already do stuff like this with video, for example, using the
> v4l2loopback kernel module with gstreamer.  I provided a very trivial[7]
> script for that and it would be interesting to have a parallel example
> for audio.
>
> Regards,
>
> Daniel
>
>
> 1. https://icecast.org/apps/
> 2. https://coolmic.net/
> 3. https://www.rode.com/microphones/smartlav-plus
> 4. https://meet.jit.si
> 5.
>
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/#module-pipe-source
> 6.
>
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/#module-tunnel-source-new
> 7. https://gitlab.com/freertc/gstreamer-chroma-key
> _______________________________________________
> Icecast mailing list
> Icecast at xiph.org
> http://lists.xiph.org/mailman/listinfo/icecast

On Wed, Jun 03, 2020 at 10:04:08AM +0200, Daniel Pocock
wrote:
> Is there any documented way to make the Icecast source client appear as
> a source in PulseAudio so that any arbitrary application can use the
> sound feed as if it was a local microphone?  For example, has anybody
> tried to do this with PulseAudio module-pipe-source[5] or
> module-tunnel-source[6]?
pactl load-module module-null-sink sink_name=NULL
pactl load-module module-remap-source master=NULL.monitor \
      source_properties=device.description=VirtualMike

Anything you feed into the NULL sink device will appear on the
VirtualMike source.

I've used it to feed live mixed audio from OBS into Zoom.

-- 
Paul Martin <pm at nowster.me.uk>