[HOWTO] Sound in Chroot

[ferviverus]

Hello!

I have cyanogenmod 10.1 (Android 4.2.2) with 3.1.10-g5174254 kernel

In chroot (LinuxOnAndroid) I don't have a sound, so I test some configuration, and I got it (in theory)

1) Binding /dev from android to chroot
Go (as root in console) to /data/data/com.zpwebsites.linuxonandroid/files
Open text editor and (i recommend nano) and change bootscript.sh file

Below "Mount all required partitions" write:

$bbox mount --bind /dev $mnt/dev
if [ $? -ne 0 ]; then error_exit "Unable to mount $mnt/dev!"; fi

Now you can use USB Printers (tested, HP Deskjet 3745 work) and Scanners (etc) in Debian Chroot

2) Run Chroot

3) Play song by mplayer (for example)

4) Unmute some channels
amixer -set -c 0 EPDAC unmute
amixer -set -c 0 HSLDAC unmute
amixer -set -c 0 HSRDAC unmute
amixer -set -c 0 "CPCAP Mixer Stereo DAC" unmute

5) And the problem ...
When Music is ended, then this channels go automatically mute (Need Fix)

#!/bin/sh

while [ neverendingloop=1 ] ;
do
sleep 2s
if amixer cget numid=27 | grep values=off > /dev/null 2>&1
then
amixer set -c 0 EPDAC unmute > /dev/null 2>&1
amixer set -c 0 HSLDAC unmute > /dev/null 2>&1
amixer set -c 0 HSRDAC unmute > /dev/null 2>&1
amixer set -c 0 "CPCAP Mixer Stereo DAC" unmute > /dev/ull 2>&1
fi
done

My fix - You should add it to init.sh (/root/init.sh)

This channels are only for headphones (and it should not working in phone speaker [probably need to unmute other channel]
You can also set a sound from headphones and phone speakers at the same time

Fervi