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livetrax/scripts/varispeed_callback.lua

33 lines
742 B
Lua

ardour {
["type"] = "EditorHook",
name = "Varispeed Test - 100ms Callback",
author = "Ardour Lua Task Force",
description = "An example script that invokes a callback a every 0.1sec and modifies the transport speed",
}
function signals ()
s = LuaSignal.Set()
s:add (
{
[LuaSignal.LuaTimerDS] = true,
}
)
return s
end
function factory (params)
-- upindex variables
local cnt = 0
local speed = 0
local delta = 0.01
return function (signal, ref, ...)
cnt = (cnt + 1) % 5 -- divide clock: every half a second
if cnt == 0 then
if speed < -0.25 then delta = delta * -1 end
if speed > 0.25 then delta = delta * -1 end
speed = speed + delta
Session:request_transport_speed (speed)
end
end
end