49 lines
1.0 KiB
Lua
49 lines
1.0 KiB
Lua
ardour {
|
|
["type"] = "dsp",
|
|
name = "MIDI generator with multiple ports",
|
|
category = "Example",
|
|
license = "MIT",
|
|
author = "R8000",
|
|
description = [[An Example Midi Generator for prototyping.]]
|
|
}
|
|
|
|
function dsp_ioconfig () return { { midi_out = 5} } end
|
|
|
|
local tme = 0 -- sample-counter
|
|
local seq = 0 -- sequence-step
|
|
local spb = 0 -- samples per beat
|
|
|
|
local midi_sequence_one = {
|
|
{ 0x90, 64, 127 },
|
|
{ 0x80, 64, 0 },
|
|
}
|
|
local midi_sequence_two = {
|
|
{ 0x90, 60, 70 },
|
|
{ 0x80, 60, 0 },
|
|
}
|
|
|
|
local midi_sequences = { midi_sequence_one, midi_sequence_two }
|
|
|
|
function dsp_init (rate)
|
|
local bpm = 120
|
|
spb = rate * 60 / bpm
|
|
if spb < 2 then spb = 2 end
|
|
end
|
|
|
|
function dsp_run (_, _, n_samples)
|
|
assert (type(midiout) == "table")
|
|
assert (spb > 1)
|
|
|
|
for time = 1,n_samples do -- not very efficient
|
|
-- TODO, timestamp the sequence in beats, calc/skip to next event
|
|
tme = tme + 1
|
|
if tme >= spb then
|
|
for m = 1, 5 do
|
|
midiout[m] = {time = time, data = midi_sequences[m % 2 + 1][seq + 1]}
|
|
end
|
|
tme = 0
|
|
seq = (seq + 1) % 2
|
|
end
|
|
end
|
|
end
|