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midi.lua
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midi.lua
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--- midi devices
-- @classmod midi
-- @alias Midi
local vport = require 'vport'
local Midi = {}
Midi.__index = Midi
Midi.devices = {}
Midi.vports = {}
for i=1,4 do
Midi.vports[i] = {
name = "none",
device = nil,
event = nil,
send = function(self, ...) if self.device then self.device:send(...) end end,
note_on = vport.wrap_method('note_on'),
note_off = vport.wrap_method('note_off'),
cc = vport.wrap_method('cc'),
pitchbend = vport.wrap_method('pitchbend'),
key_pressure = vport.wrap_method('key_pressure'),
channel_pressure = vport.wrap_method('channel_pressure'),
program_change = vport.wrap_method('program_change'),
start = vport.wrap_method('start'),
stop = vport.wrap_method('stop'),
continue = vport.wrap_method('continue'),
clock = vport.wrap_method('clock'),
song_position = vport.wrap_method('song_position'),
song_select = vport.wrap_method('song_select'),
}
end
--- constructor
-- @tparam integer id : arbitrary numeric identifier
-- @tparam string name : name
-- @tparam userdata dev : opaque pointer to device
function Midi.new(id, name, dev)
local d = setmetatable({}, Midi)
d.id = id
d.name = vport.get_unique_device_name(name, Midi.devices)
d.dev = dev -- opaque pointer
d.event = nil -- event callback
d.remove = nil -- device unplug callback
d.port = nil
-- autofill next postiion
local connected = {}
for i=1,4 do
table.insert(connected, Midi.vports[i].name)
end
if not tab.contains(connected, name) then
for i=1,4 do
-- assign device unless device is specialized virtual interface
if Midi.vports[i].name == "none" and d.name ~= "virtual" then
Midi.vports[i].name = d.name
break
end
end
end
return d
end
--- static callback when any midi device is added.
-- user scripts can redefine.
-- @static
-- @param dev : a Midi table
function Midi.add(dev) end
--- static callback when any midi device is removed.
-- user scripts can redefine.
-- @static
-- @param dev : a Midi table
function Midi.remove(dev) end
--- send midi event to device.
-- @param data
function Midi:send(data)
if data.type then
local d = Midi.to_data(data)
_norns.midi_send(self.dev, d)
else
_norns.midi_send(self.dev, data)
end
end
--- send midi note on event.
-- @tparam integer note : note number
-- @tparam integer vel : velocity
-- @tparam integer ch : midi channel
function Midi:note_on(note, vel, ch)
self:send{type="note_on", note=note, vel=vel, ch=ch or 1}
end
--- send midi note off event.
-- @tparam integer note : note number
-- @tparam integer vel : velocity
-- @tparam integer ch : midi channel
function Midi:note_off(note, vel, ch)
self:send{type="note_off", note=note, vel=vel or 100, ch=ch or 1}
end
--- send midi continuous controller event.
-- @tparam integer cc : cc number
-- @tparam integer val : value
-- @tparam integer ch : midi channel
function Midi:cc(cc, val, ch)
self:send{type="cc", cc=cc, val=val, ch=ch or 1}
end
--- send midi pitchbend event.
-- @tparam integer val : value
-- @tparam integer ch : midi channel
function Midi:pitchbend(val, ch)
self:send{type="pitchbend", val=val, ch=ch or 1}
end
--- send midi key pressure event.
-- @tparam integer note : note number
-- @tparam integer val : value
-- @tparam integer ch : midi channel
function Midi:key_pressure(note, val, ch)
self:send{type="key_pressure", note=note, val=val, ch=ch or 1}
end
--- send midi channel pressure event.
-- @tparam integer val : value
-- @tparam integer ch : midi channel
function Midi:channel_pressure(val, ch)
self:send{type="channel_pressure", val=val, ch=ch or 1}
end
--- send midi program change event.
-- @tparam integer val : value
-- @tparam integer ch : midi channel
function Midi:program_change(val, ch)
self:send{type="program_change", val=val, ch=ch or 1}
end
--- send midi start event.
function Midi:start()
self:send{type="start"}
end
--- send midi stop event.
function Midi:stop()
self:send{type="stop"}
end
--- send midi continue event.
function Midi:continue()
self:send{type="continue"}
end
--- send midi clock event.
function Midi:clock()
self:send{type="clock"}
end
--- send midi song position event.
-- @tparam integer lsb :
-- @tparam integer msb :
function Midi:song_position(lsb, msb)
self:send{type="song_position", lsb=lsb, msb=msb}
end
--- send midi song select event.
-- @tparam integer val : value
function Midi:song_select(val)
self:send{type="song_select", val=val}
end
--- create device, returns object with handler and send.
-- @tparam integer n : vport index
function Midi.connect(n)
local n = n or 1
return Midi.vports[n]
end
--- clear handlers.
function Midi.cleanup()
for i=1,4 do
Midi.vports[i].event = nil
end
for _, dev in pairs(Midi.devices) do
dev.event = nil
end
end
-- utility
-- function table for msg-to-data conversion
local to_data = {
-- FIXME: should all subfields have default values (ie note/vel?)
note_on = function(msg)
return {0x90 + (msg.ch or 1) - 1, msg.note, msg.vel or 100}
end,
note_off = function(msg)
return {0x80 + (msg.ch or 1) - 1, msg.note, msg.vel or 100}
end,
cc = function(msg)
return {0xb0 + (msg.ch or 1) - 1, msg.cc, msg.val}
end,
pitchbend = function(msg)
return {0xe0 + (msg.ch or 1) - 1, msg.val & 0x7f, (msg.val >> 7) & 0x7f}
end,
key_pressure = function(msg)
return {0xa0 + (msg.ch or 1) - 1, msg.note, msg.val}
end,
channel_pressure = function(msg)
return {0xd0 + (msg.ch or 1) - 1, msg.val}
end,
program_change = function(msg)
return {0xc0 + (msg.ch or 1) - 1, msg.val}
end,
start = function(msg)
return {0xfa}
end,
stop = function(msg)
return {0xfc}
end,
continue = function(msg)
return {0xfb}
end,
clock = function(msg)
return {0xf8}
end,
song_position = function(msg)
return {0xf2, msg.lsb, msg.msb}
end,
song_select = function(msg)
return {0xf3, msg.val}
end
}
--- convert msg to data (midi bytes).
-- @tparam table msg :
-- @treturn table data : table of midi status and data bytes
function Midi.to_data(msg)
if msg.type then
return to_data[msg.type](msg)
else
error('failed to serialize midi message')
end
end
--- convert data (midi bytes) to msg.
-- @tparam table data :
-- @treturn table msg : midi message table, contents vary depending on message
function Midi.to_msg(data)
local msg = {}
-- note on
if data[1] & 0xf0 == 0x90 then
msg = {
note = data[2],
vel = data[3],
ch = data[1] - 0x90 + 1
}
if data[3] > 0 then
msg.type = "note_on"
elseif data[3] == 0 then -- if velocity is zero then send note off
msg.type = "note_off"
end
-- note off
elseif data[1] & 0xf0 == 0x80 then
msg = {
type = "note_off",
note = data[2],
vel = data[3],
ch = data[1] - 0x80 + 1
}
-- cc
elseif data[1] & 0xf0 == 0xb0 then
msg = {
type = "cc",
cc = data[2],
val = data[3],
ch = data[1] - 0xb0 + 1
}
-- pitchbend
elseif data[1] & 0xf0 == 0xe0 then
msg = {
type = "pitchbend",
val = data[2] + (data[3] << 7),
ch = data[1] - 0xe0 + 1
}
-- key pressure
elseif data[1] & 0xf0 == 0xa0 then
msg = {
type = "key_pressure",
note = data[2],
val = data[3],
ch = data[1] - 0xa0 + 1
}
-- channel pressure
elseif data[1] & 0xf0 == 0xd0 then
msg = {
type = "channel_pressure",
val = data[2],
ch = data[1] - 0xd0 + 1
}
-- program change
elseif data[1] & 0xf0 == 0xc0 then
msg = {
type = "program_change",
val = data[2],
ch = data[1] - 0xc0 + 1
}
-- start
elseif data[1] == 0xfa then
msg.type = "start"
-- stop
elseif data[1] == 0xfc then
msg.type = "stop"
-- continue
elseif data[1] == 0xfb then
msg.type = "continue"
-- clock
elseif data[1] == 0xf8 then
msg.type = "clock"
-- song position pointer
elseif data[1] == 0xf2 then
msg = {
type = "song_position",
lsb = data[2],
msb = data[3]
}
-- song select
elseif data[1] == 0xf3 then
msg = {
type = "song_select",
val = data[2]
}
-- active sensing (should probably ignore)
elseif data[1] == 0xfe then
-- do nothing
-- system exclusive
elseif data[1] == 0xf0 then
msg = {
type = "sysex",
raw = data,
}
-- everything else
else
msg = {
type = "other",
raw = data,
}
end
return msg
end
--- update devices.
function Midi.update_devices()
-- reset vports for existing devices
for _,device in pairs(Midi.devices) do
device.port = nil
end
-- connect available devices to vports
for i=1,4 do
Midi.vports[i].device = nil
for _, device in pairs(Midi.devices) do
if device.name == Midi.vports[i].name then
Midi.vports[i].device = device
device.port = i
end
end
end
end
--- add a device.
_norns.midi.add = function(id, name, dev)
local d = Midi.new(id, name, dev)
Midi.devices[id] = d
Midi.update_devices()
if Midi.add ~= nil then Midi.add(d) end
end
--- remove a device.
_norns.midi.remove = function(id)
if Midi.devices[id] then
if Midi.devices[id].remove then
Midi.devices[id].remove()
end
end
Midi.devices[id] = nil
Midi.update_devices()
end
--- handle a midi event.
_norns.midi.event = function(id, data)
local d = Midi.devices[id]
if d ~= nil then
if d.event ~= nil then
d.event(data)
end
if d.port then
if Midi.vports[d.port].event then
Midi.vports[d.port].event(data)
end
-- hack = send all midi to menu for param-cc-map
norns.menu_midi_event(data, d.port)
end
else
error('no entry for midi '..id)
end
end
return Midi