Experimental Audio over IP Intercom Receiver - using a Raspberry PI & the VOIP APP - Seren
Description: Experimental setup for using a Raspberry Pi as an AUDIO OVER IP Receiver...using its own ANALOGUE AUDIO OUTPUT speaker jack. The VOIP APP chosen is SEREN:
Seren is a command line program and runs using just ALSA on Linux(Raspbian for PI) ALSA is chosen to simplify the setup...and save some CPU cycles from being chewed up by PULSEAUDIO.
Since the PI does not have audio input...I instead told Seren to use an ALSA LOOPBACK CABLE(snd.aloop module)
to bring up this "virtual" soundcard, snd.aloop module, that will show up as a soundcard in Linux... just issue this command :
"sudo modprobe snd-aloop" (without quotes)
then you can type in terminal - arecord -l and aplay-l & you should see the new virtual sound card show up...
Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
make note of the CARD NUMBER of the virtual loopback and then
tell SEREN to use that as its input, here is what the command looks like on my Raspberry Pi to get Seren running and ready for receiving an outside connection:(LAN or WAN)
seren -d hw:0 -D hw:4 -a -n Raspberry_PI
hw:0 is the Pi's own analogue sound card(output)
hw:4 is the snd-aloop loopback sound card(input)- NOTE: we are only using the loopback input so SEREN will start up, we actually do not intend to input any audio from the loopback...but I found that Seren using alsa, will not load unless it registers an "input" sound card.
-a is so that the Raspberry Pi will automatically answer a call
-n is what you can "name" the Pi's Seren...which I chose "Raspberry_PI"
on the REMOTE computer(LAN or WAN) (NOTE: - if remote is from the WAN, then you have to port forward in your router to the Raspberry PI's internal ip address...Seren's default port # is 8110)
the laptop's SEREN terminal command line used in this video is:
seren -d pulse -a -n REMOTEconnection
-d pulse uses PULSEAUDIO on the laptop
the connection is automatic, if the -a command was used on the PI's SEREN
the bitrate was set to 64000
sample rate was set to 48000
encryption was "on"
PODCAST shown on video is from here:
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Published at: 2017-04-17 19:45:44.000
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