AudioInjector headphone jack left/right reversed?

[LWesthaver]

I just got a new AudioInjector today and installed it. Installation went pretty easy. Sounds good.

But, when I ran some audio test files to check for left/right channel operation and phasing it appears that the 3.5mm audio jack has the left and right channels reversed. To verify, I ran the same files on several of my computers and checked with multiple headphone sets. All systems checked ok except for the AudioInjector.

Can the left/right channels be swapped in software to compensate?

-Wes

[flatmax]

Hey there,

I believe that the AudioInjector Stereo card has the right headphone wired to the tip and the left routed to the sleeve of the headphone jack.

In order to reroute left to right and vice versa, you can use the ALSA route plugin to automatically switch channels.
First step, backup your .asoundrc :

Code: Select all

cd $HOME
cp .asoundrc .asoundrc.bak

Save the following file to .asoundrc and anything which uses the sound device will automatically have their channels switched :

Code: Select all

pcm.!default {
        type plug
        slave.pcm "switchChannels"
}

ctl.!default {
        type hw
        card 0
}

pcm.switchChannels {
    type route
    slave.pcm "hw:0"
    ttable.0.1 1
    ttable.1.0 1
}

[LWesthaver]

ok, got it.

How about the other question I posted about only being able to run one instance of OMXPlayer with the AudioInjector card? That post never got approved?

-Wes

[flatmax]

Apologies, can you please post again. This site collects a lot of spam posts, which no one ever sees, it is likely it got misplaced in there !

thanks
Matt

[PiEater3]

I've added the code that was suggested to hack the left right error on the card, but even after doing this the audio is still swapped after a reboot.
I know it seems trivial, however with wanting a live 24/7 binaural audio stream (that's fine), and a live stream to YouTube (not so) would make any watchers confused as they are not hearing what they would see, swapping ear buds isn't always possible.

Is there a planned re-hash of the boards? probably no one else would be bothered, but I can't really use stereo adapters the manually swap, it's defeating the game.

I do like the audio card, it seems to be less noisy than those now no longer made Cirrus Logic 'pain in ass' audio cards, just a few crinkles to iron out and you've an audio card that is totally usable in many applications. If I would have know about these cards before I did, I would have backed this project.