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local ml = require 'melisma.lazy'
ml.util.openmodule(ml.functional)
local argv = ml.internal.argv
local device = argv[1]
if not device then
print('Usage: melisma -C synth main.lua DEVICE')
print('Available devices are:')
for _,source in ipairs(ml.port.midi.sources()) do
print('\t'..source)
end
os.exit(1)
end
local mport = ml.port.midi.input.open('midi-in')
print(string.format('Connecting device \'%s\'', device))
mport:connect(device)
local wt = ml.oscil.wavetable.saw()
wt = wt + wt:scale(2)
local size = 8
local active = replicate(false, size)
local allocs = replicate(nil, 128)
local oscil = replicate(bind(ml.oscil.init, wt, 0, 0), size)
local interp = replicate(bind(ml.interp.init, 0), size)
zip(ml.oscil.mapa, oscil, interp)
local mix = ml.mixer.init(table.unpack(oscil))
local delay = ml.delay.init(mix)
:delay(0.2)
:feedback(0.4)
:wetdrymix(0.5)
:gain(0.8)
local lowpass = ml.biquad.lowpass.init(delay)
:cutoff(4000)
:resonance(0.7)
local aport = ml.port.audio.output.open('audio-out', lowpass)
local dests = ml.port.audio.destinations()
fmap(bind(aport.connect, aport), dests)
local attack = 0.025
local release = 0.05
local function handle_on(key, vel)
print('on', key)
-- Check if this note is already on
if allocs[key] then return end
-- Find unused oscillator
local i = nil
for j = 1,size do
if not active[j] then
i = j
break
end
end
if not i then return end
-- Play the note
print('activate oscillator', i)
active[i] = true
allocs[key] = i
interp[i]:linear(vel / 127.0, attack)
local f = 440 * 2^((key - 57) / 12.0)
print('frequency', f)
oscil[i]:setf(f)
end
local function free(args)
-- Mark the oscillator as unused after the note is released
local i, key = table.unpack(args)
print('free oscillator', i)
active[i] = false
allocs[key] = nil
end
local function handle_off(key)
print('off', key)
-- Find the oscillator
local i = allocs[key]
if not i then return end
-- Stop playing the note
print('deactivate oscillator', i)
interp[i]:linear(0, release)
ml.event.schedule(release, free, { i, key })
end
mport:callback(function(msg)
local status = msg.status & 0xf0
local key = msg.data1
local vel = msg.data2
print('received', status, key, vel)
local off = 0x80
local on = 0x90
if status == off then
handle_off(key)
return
end
if status == on then
handle_on(key, vel)
return
end
end)
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