HOWTO: Audio Line out when using HDMI

[deskwizard]

Good afternoon everyone,
For developpement purposes, I am using an HDMI monitor which, when connected becomes the default audio device.

If like me you want to use the line out jack with an HDMI monitor connected, use this very simple line I figured out completely by accident:

setprop audio.routing 2

2 being Line out, 1024 being HDMI.

This will work until reboot/HDMI reconnection if disconnected.

I am working on a modified audio HAL that will check for a HDMI audio bypass property and output on the selected device accordingly that would work on reboots and HDMI connect/disconnect.

I'll keep you guys/gals posted.

DW

[rouvas]

Check this out

https://www.olimex.com/forum/index.php?topic=3645.msg15369#msg15369

for another approach to using the line-out jack.

[deskwizard]

Thanks for the heads up man, wish I saw that lol

[deskwizard]

I noticed I forgot to specify I was using Android.

There is no such file under Android.
I will go back to my first idea, at least for my own project.

DW

[deskwizard]

Modified HAL @

http://pastebin.com/nrpFaPmb


Uses the property audio.hdmi_bypass to direct audio output to either HDMI monitor or Line out jack

Add to init.sun7i.rc:

Code Select Expand

setprop audio.hdmi_bypass 1

1 for bypass HDMI and output to line out
0 for HDMI audio

Default is 0, so no need to set the prop to 0 to use HDMI audio out by default.

Survives HDMI cable connection/deconnection.

DW