EDID based passthrough formats for Vero / Kodi

999-passthrough-formats.rules

# /etc/udev/rules.d/999-passthrough-formats.rules
KERNEL=="hdmi_audio", ACTION=="change", ATTR{state}=="HDMI=1", RUN+="/bin/bash -c '/home/osmc/.kodi/userdata/passthrough-format-from-edid.sh %p >> /var/log/edit_passthrough_detection_errors.log 2>&1'"

passthrough-format-from-edid.sh

#!/bin/bash

# /home/osmc/.kodi/userdata/passthrough-format-from-edid.sh

if [ -z "$1" ]
  then
    echo "Arg 1 must be the devpath"
    exit 1;
fi

EDIDFILE="/sys$1/device/edid"

if [ ! -f "$EDIDFILE" ]; then
    echo "$EDIDFILE does not exist."
    exit 2;
fi

#date

declare -a FORMATS
declare -a SETTINGS

FORMATS[2]=ac3
FORMATS[10]=eac3
FORMATS[7]=dts
FORMATS[12]=truehd
FORMATS[11]=dtshd

FORMATIDS=""

for ID in ${!FORMATS[@]}; do
    FORMATIDS+="$ID|"
    SETTINGS[$ID]="false"
done

SUPPORTED=$(egrep -o "^\{(${FORMATIDS:0:-1}), " $EDIDFILE | sort -V -u)

ACTIVES=""

for ID in $SUPPORTED; do
    ID=${ID:1:-1}
    SETTINGS[$ID]="true"
    ACTIVES+="${FORMATS[$ID]}, "
done

for id in ${!FORMATS[@]}; do
    echo "{\"jsonrpc\":\"2.0\", \"method\":\"Settings.SetSettingValue\", \"params\":{\"setting\":\"audiooutput.${FORMATS[$id]}passthrough\",\"value\":${SETTINGS[$id]}}, \"id\":1}" > /dev/tcp/localhost/9090
done

MESSAGE="Active for ${ACTIVES:0:-2}"

echo "{\"jsonrpc\":\"2.0\", \"method\":\"GUI.ShowNotification\", \"params\":{\"title\":\"Audio Passthrough\",\"message\":\"$MESSAGE\", \"displaytime\":10000}, \"id\":1}" > /dev/tcp/localhost/9090

echo $MESSAGE

systemd-udevd.service

# /lib/systemd/system/systemd-udevd.service

# add IPAddressAllow=localhost after IPAddressDeny=any

[Service]
...
IPAddressDeny=any
IPAddressAllow=localhost
...