conf.d/project/etc/4a-softmixer-config.json


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{
    "schema": "To Be Defined",
    "metadata": {
        "uid": "Soft Mixer",
        "version": "1.0",
        "api": "softmixer",
        "info": "Soft Mixer emulating hardware mixer"
    },
    "plugins": [
        {
            "uid": "alsa-router",
            "ldpath": "./plugins/alsa",
            "lua2c": ["snd_cards", "snd_zones", "snd_loops", "snd_streams"],
            "info": "Map alsa-loop subdevices to 4A HAL streams"
        }
    ],

    "onload": [
        {
            "uid": "init-soft-mixer",
            "info": "Initialise Audio Router",
            "lua": "_init_softmixer_"
        }
    ],

    "sndcards": [
        {
            "uid": "Focusrite_Scarlett_18i8",
            "info": "Focusrite 18i8",
            "device": "/dev/snd/by-id/usb-Focusrite_Scarlett_18i8_USB_10004EE6-00",
            "action": {
                "uid": "init-snd-card",
                "function": "lua://init-focusrite"
            },
            "channels": {
                "sink": [
                    {
                        "type": "FrontLeftFullRange",
                        "port": 0
                    },
                    {
                        "type": "FrontRightFullRange",
                        "port": 1
                    },
                    {
                        "type": "RearLeftFullRange",
                        "port": 2
                    },
                    {
                        "type": "FrontRightFullRange",
                        "port": 3
                    },
                    {
                        "type": "Center",
                        "port": 4
                    },
                    {
                        "type": "LFE",
                        "port": 5
                    }
                ],
                "source": [
                    {
                        "uid": "FrontRightMic",
                        "type": "Directional",
                        "port": 0
                    }
                ]
            }
        }
    ],

    "streams": [{
            "uid": "alsa-loop",
            "dev": "/dev/snd/by-path/platform-snd_aloop.0",
            "subdev": 0,
            "count": 8
        }],

    "controls": [
        {
            "uid": "mixer-config",
            "lua": "_mixer_config_"
        },
        {
            "uid": "snd-cards",
            "callback": {
                "plugin": "alsa-router",
                "function": "snd_cards"
            }
        },
        {
            "uid": "snd-zone",
            "callback": {
                "plugin": "alsa-router",
                "function": "snd_zones"
            }
        }
    ]
}