Digital Audio Output

ZekeNorris

Hi All,

New to the Linux world and probably not as well versed in programming as many - hoping for some pointers to speed along a current project.

The Bela works as advertised - better than anticipated. The examples in the cpp code to get the sound coming in and out of the analog outputs worked with no problems and modifying the samples to get the needed results was not an issue.

The next phase of the project requires the following:
44.1 khz digital audio out in realtime (close as possible) going into a Raspberry Pi 4 where it can there be further edited (potentially with PureData) and also joined with video (from a separate Pi) then uploaded for livestreaming.

After a good amount of digging I have been unable to determine the best method for digital communication between the RPI and BELA and I don't know if it's because it's something simple that I should already know or a tricky problem but should I be looking into:

I2S
USB (serial)
UDP (ethernet)
UART
OSC
16 pins of digital GPIO

Any and all suggestions will be appreciated to help reduce the amount of time needed in research🙂

Thanks,

Zeke Norris

ryjobil

ZekeNorris 44.1 khz digital audio out in realtime (close as possible)

ZekeNorris and also joined with video (from a separate Pi) then uploaded for livestreaming.

It may be acceptable to use a network socket to transport audio rather than a digital audio interface. When you get into the pi4 you will take the normal operating system latency hit and you will have to synchronize audio and video anyway. In this case, Bela becomes a fancy audio interface and the realtime low-latency capabilities are not the most important feature.

Transporting audio over network might simplify the interface. For example, something like this might allow you to easily access Bela audio from the Pi:
http://write.flossmanuals.net/pure-data/audio-streaming/