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output "Line in" sound

Sat Dec 22, 2018 5:31 pm

hello, I'm trying to output "line in" sound if nothing is playing on shairport. if anyone has any thought about how i could get this to work please let me know. Thanks in advance

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Re: output "Line in" sound

Sat Dec 22, 2018 5:56 pm

I assume you mean shairplay, not shairpoint?
Please explain where that line in signal comes from?
It is not possible to input audio to a Pi via the built-in audio connector; it only works as output.

If you're meaning some digital audio coming from other sources, try exiting the shairplay program and see if you can get some sound out.
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Re: output "Line in" sound

Sat Dec 22, 2018 6:00 pm

The first step would be to add a sound device with a line in. No Pi model has one as standard.

Beyond that, more info on your hardware and software setup is likely to be needed.

If you're using shairport-sync, it can be configured to run a command both before play begins and after play ends. You could use this functionality to stop and start playback of audio from a line in source. You'd need a sound device that supports line in (see above) and a suitable audio player program.

Actual details of how to configure this depends very much on your choice of hardware, player software and system level sound software (ALSA, Pulse audio, etc).
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Re: output "Line in" sound

Wed Dec 26, 2018 5:08 pm

thank you very much for the quick responds, i bought a external sound card with a line in and outputs. I'm trying to use the line in from an iPad that will take priority meaning that if the iPad is playing sound i want it to come through and if it's not playing then sound from shairport-sync will be able to come through. i don't know the exact chip set but its compatible alsa sound by default (but heres the link if that helps https://www.amazon.com/Optimal-Shop-Ext ... B00Q4WQ7XW). i would like to use alsa sound just because i have the sound card working with alsa sound right now but i'm very willing to switch to another solution if needed. i really need the basics on how to handle line in. is there some python classes that i can just import to allow me to tunnel the line in to the line out? also for whatever solution if there a way to check is line is active or can i only check whether shairport-sync is playing? and a thought for a little down the road, does anyone know of a shairport-sync metadata decoder that is compatible with ios 12, it seems once i updated to ios 12 the decoder that is linked in their github gets much more warning flags than after about 20 secs stops. i think this is due to airplay being updated to airplay 2 or something to allow for stereo airplay devices. thanks again

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