automation_osc.lua

ardour {
    ["type"]    = "EditorHook",
    name        = "Automation to OSC"
}

function signals ()
    return LuaSignal.Set():add ({[LuaSignal.LuaTimerS] = true})
end

function factory ()

    local port = ARDOUR.LuaOSC.Address ("osc.udp://127.0.0.1:5555")

    -- define which parameters of which plugins of which track should be sent
    local tracks = {
        [0] = { -- [track index] = {
            [0] = {5} -- [plugin index] = {parameters indexes}
        }, -- }
        [1] = {
            [1] = {0, 2}
        }
    }

    return function (signal, ref, ...)
        -- runs every 100ms

        local playhead = Session:transport_sample ()

        -- loop over tracks, plugins and parameters
        for track_id, plugins in pairs(tracks) do

            -- get route
            local route = Session:get_remote_nth_route (track_id)

            if not route:isnil() then

                for plugin_id, parameters in pairs(plugins) do

                    -- get plugin
                    local plugin = route:nth_plugin (plugin_id)

                    if not plugin:isnil() then

                        for k, parameter_id in pairs(parameters) do

                            -- get AutomationList, ControlList and ParameterDescriptor
                            local al, cl, pd = ARDOUR.LuaAPI.plugin_automation (plugin, parameter_id)

                            if not cl:isnil() then

                                -- get parameter value
                                local value = cl:eval (playhead)

                                -- send osc
                                port:send("/automation", "iiif", track_id, plugin_id, parameter_id, value)

                            end

                        end

                    end

                end
            end
        end


    end
end