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