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ardour {
["type"] = "dsp",
name = "Notch Bank",
category = "Example",
license = "MIT",
author = "Ardour Lua Task Force",
description = [[An Example Filter Plugin]]
}
function dsp_ioconfig ()
return
{
{ audio_in = 1, audio_out = 1},
}
end
function dsp_params ()
return
{
{ ["type"] = "input", name = "Base Freq", min = 10, max = 1000, default = 100, unit="Hz", logarithmic = true },
{ ["type"] = "input", name = "Quality", min = 1.0, max = 16.0, default = 8.0 },
{ ["type"] = "input", name = "Stages", min = 1.0, max = 20, default = 6.0, integer = true },
}
end
local filters = {} -- the biquad filter instances
local freq = 0
local bw = 0
function dsp_init (rate)
for i = 1,20 do
filters[i] = ARDOUR.DSP.Biquad (rate)
end
end
function dsp_run (ins, outs, n_samples)
assert (#outs == 1)
assert (n_samples < 8192)
-- this is quick/dirty: no declick, no de-zipper, no latency reporting,...
-- and no documentation :)
local ctrl = CtrlPorts:array() -- get control parameters
if freq ~= ctrl[1] or bw ~= ctrl[2] then
freq = ctrl[1]
bw = ctrl[2]
for i = 1,20 do
filters[i]:compute (ARDOUR.DSP.BiquadType.Notch, freq * i, bw, 0)
end
end
if not ins[1]:sameinstance (outs[1]) then
ARDOUR.DSP.copy_vector (outs[1], outs[1], n_samples)
end
local stages = math.floor (ctrl['3'])
if stages < 1 then stages = 1; end
if stages > 20 then stages = 20; end
for i = 1, stages do
filters[i]:run (outs[1], n_samples)
end
end
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