49 lines
1.0 KiB
Lua
49 lines
1.0 KiB
Lua
ardour {
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["type"] = "dsp",
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name = "Midi Generator",
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category = "Example", -- "Utility"
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license = "MIT",
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author = "Ardour Lua Task Force",
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description = [[An Example Midi Generator for prototyping.]]
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}
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function dsp_ioconfig ()
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return { { midi_out = 1, audio_in = 0, audio_out = 0}, }
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end
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local tme = 0 -- sample-counter
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local seq = 1 -- sequence-step
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local spb = 0 -- samples per beat
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local midi_sequence = {
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{ 0x90, 64, 127 },
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{ 0x80, 64, 0 },
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}
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function dsp_init (rate)
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local bpm = 120
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spb = rate * 60 / bpm
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if spb < 2 then spb = 2 end
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end
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function dsp_run (_, _, n_samples)
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assert (type(midiout) == "table")
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assert (spb > 1)
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local m = 1
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for time = 1,n_samples do -- not very efficient
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-- TODO, timestamp the sequence in beats, calc/skip to next event
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tme = tme + 1
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if tme >= spb then
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midiout[m] = {}
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midiout[m]["time"] = time
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midiout[m]["data"] = midi_sequence[seq]
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tme = 0
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m = m + 1
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if seq == #midi_sequence then seq = 1 else seq = seq + 1 end
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end
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end
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end
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