{
    "desciption": "A volume controller allows to control volume and mute. At the very least, increaseVolume and decreaseVolume are to be implemented for devices that don't have a way to fetch the current volume. For devices allowing to set an absolute volume value, the volume and mute states should be implemented as well.",
    "extends": "media",
    "states": [
        {
            "name": "mute",
            "type": "bool",
            "writable": true,
            "optional": true
        },
        {
            "name": "volume",
            "type": "int",
            "minValue": "any",
            "maxValue": "any",
            "writable": true,
            "optional": true
        }
    ],
    "actions": [
        {
            "name": "increaseVolume"
        },
        {
            "name": "decreaseVolume"
        }
    ]
}