Fivem - Mumble splitting

local deltas = {
    vector2(-1, -1),
    vector2(-1, 0),
    vector2(-1, 1),
    vector2(0, -1),
    vector2(1, -1),
    vector2(1, 0),
    vector2(1, 1),
    vector2(0, 1),
}


local targetList = {}
local lastTargetList = {}


local function getGridChunk(x)
    return math.floor((x + 8192) / 256)
end

local function getGridBase(x)
    return (x * 256) - 8192
end

local function toChannel(v)
    return (v.x << 8) | v.y
end

local function DoVoiceSystem()
    local coords = GetEntityCoords(PlayerPedId())

    local gz = vector2(getGridChunk(coords.x), getGridChunk(coords.y))

    local gridZone = toChannel(gz)

    NetworkSetVoiceChannel(gridZone)

    targetList = {}

    for _, d in ipairs(deltas) do
        local v = coords.xy + (d * 20) -- edge size

        targetList[toChannel(vector2(getGridChunk(v.x), getGridChunk(v.y)))] = true
    end

    MumbleClearVoiceTarget(2)
    for k, _ in pairs(targetList) do
        MumbleAddVoiceTargetChannel(2, k)
    end
    MumbleSetVoiceTarget(2)

    lastTargetList = targetList
end

-- Loop
Citizen.CreateThread(function()
    Citizen.Wait(500)

    while true do
        DoVoiceSystem()
        Citizen.Wait(250)
    end
end)