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ardour {
["type"] = "dsp",
name = "Spike Synth",
category = "Instrument",
license = "MIT",
author = "Ardour Lua Task Force",
description = [[A debug and test-instrumentation synth. This plugin is useful with Ardour's "Dummy" backend "Engine-Pulse" mode to verify capture alignment. This plugin generate the exact same audio-signal from MIDI data that the backend also generates: Note-on: +1, Note-off: -1.]]
}
function dsp_ioconfig ()
return { { midi_in = 1, audio_in = 0, audio_out = 1} }
end
function dsp_run (ins, outs, n_samples)
local a = {}
for s = 1, n_samples do a[s] = 0 end
for c = 1,#outs do
ARDOUR.DSP.memset (outs[c], 0, n_samples)
end
assert (type(midiin) == "table")
for _,b in pairs (midiin) do
local t = b["time"] -- t = [ 1 .. n_samples ]
local d = b["data"] -- get midi-event
if (#d == 3 and (d[1] & 240) == 144) then -- note on
for c = 1,#outs do
outs[c]:array()[t] = 1.0
end
end
if (#d == 3 and (d[1] & 240) == 128) then -- note off
for c = 1,#outs do
outs[c]:array()[t] = -1.0
end
end
end
end
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