46 lines
1.2 KiB
Lua
46 lines
1.2 KiB
Lua
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ardour {
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["type"] = "dsp",
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name = "Simple Amp III",
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license = "MIT",
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author = "Robin Gareus",
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email = "robin@gareus.org",
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site = "http://gareus.org",
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description = [[
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An Example DSP Plugin for processing audio, to
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be used with Ardour's Lua scripting facility.]]
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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 = "Gain", min = -20, max = 20, default = 6, unit="dB", scalepoints = { ["0"] = 0, ["twice as loud"] = 6 , ["half as loud"] = -6 } },
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}
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end
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-- use ardour's vectorized functions
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--
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-- This is as efficient as Ardour doing it itself in C++
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-- Lua function overhead is negligible
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--
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-- this also exemplifies the /simpler/ way of letting ardour to
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-- the channel and offset mapping.
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function dsp_run (ins, outs, n_samples)
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local ctrl = CtrlPorts:array() -- get control port array (read/write)
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local gain = ARDOUR.DSP.dB_to_coefficient (ctrl[1])
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assert (#ins == #outs) -- ensure that we can run in-place
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for c = 1,#ins do
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--for c in pairs (ins) do -- also works, slightly less effective
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ARDOUR.DSP.apply_gain_to_buffer (ins[c], n_samples, gain); -- process in-place
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end
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end
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