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ardour { | ||
["type"] = "dsp", | ||
name = "Notch Bank", | ||
category = "Example", | ||
license = "MIT", | ||
author = "Ardour Lua Task Force", | ||
description = [[An Example Filter Plugin]] | ||
} | ||
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function dsp_ioconfig () | ||
return | ||
{ | ||
{ audio_in = 1, audio_out = 1}, | ||
} | ||
end | ||
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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 | ||
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local filters = {} -- the biquad filter instances | ||
local freq = 0 | ||
local bw = 0 | ||
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function dsp_init (rate) | ||
for i = 1,20 do | ||
filters[i] = ARDOUR.DSP.Biquad (rate) | ||
end | ||
end | ||
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function dsp_run (ins, outs, n_samples) | ||
assert (#outs == 1) | ||
assert (n_samples < 8192) | ||
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-- this is quick/dirty: no declick, no de-zipper, no latency reporting,... | ||
-- and no documentation :) | ||
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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 | ||
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if not ins[1]:sameinstance (outs[1]) then | ||
ARDOUR.DSP.copy_vector (outs[1], outs[1], n_samples) | ||
end | ||
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local stages = math.floor (ctrl['3']) | ||
if stages < 1 then stages = 1; end | ||
if stages > 20 then stages = 20; end | ||
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for i = 1, stages do | ||
filters[i]:run (outs[1], n_samples) | ||
end | ||
end |