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import Constant, Op, Input, T, Struct, sig, evt from require 'alv.base'
import input, output, port, apply_range from require 'alv-lib._midi'
import monotime from require 'system'
gate = Constant.meta
meta:
name: 'gate'
summary: "gate from note-on and note-off messages."
examples: { '(midi/gate [port] note [chan])' }
value: class extends Op
pattern = -sig['midi/in'] + sig.num -sig.num
setup: (inputs, scope) =>
{ port, note, chan } = pattern\match inputs
@out or= T.bool\mk_sig!
super
port: Input.cold port or scope\get '*midi*'
note: Input.hot note
chan: Input.hot chan or Constant.num -1
internal: Input.hot T.bool\mk_sig!
poll: =>
{ :port, :note, :chan, :internal } = @inputs
msgs = port!.msgs
for i = #msgs, 1, -1
msg = msgs[i]
if msg.a == note! and (chan! == -1 or msg.chan == chan!)
if msg.status == 'note-on'
internal.result\set true
return true
elseif msg.status == 'note-off'
internal.result\set false
return true
false
tick: =>
{ :note, :chan, :internal } = @inputs
if note\dirty! or chan\dirty!
@out\set false
elseif internal\dirty!
@out\set internal!
trig = Constant.meta
meta:
name: 'trig'
summary: "`bang`s from note-on messages."
examples: { '(midi/trig [port] note [chan])' }
value: class extends Op
pattern = -sig['midi/in'] + sig.num -sig.num
setup: (inputs, scope) =>
{ port, note, chan } = pattern\match inputs
@out or= T.bang\mk_evt!
super
port: Input.cold port or scope\get '*midi*'
note: Input.cold note
chan: Input.cold chan or Constant.num -1
internal: Input.hot T.bang\mk_evt!
poll: =>
{ :port, :note, :chan, :internal } = @inputs
msgs = port!.msgs
for i = #msgs, 1, -1
msg = msgs[i]
if msg.a == note! and (chan! == -1 or msg.chan == chan!)
if msg.status == 'note-on'
internal.result\set true
return true
false
tick: =>
@out\set @inputs.internal!
cc = Constant.meta
meta:
name: 'cc'
summary: "`num` from cc-change messages."
examples: { '(midi/cc [port] cc [range] [chan])' }
description: "
`range` can be one of:
- 'raw' [ 0 - 128[
- 'uni' [ 0 - 1[ (default)
- 'bip' [-1 - 1[
- 'rad' [ 0 - tau[
- 'deg' [ 0 - 360[
- (num) [ 0 - num["
value: class extends Op
pattern = -sig['midi/in'] + sig.num + -(sig.num / sig.str) + -sig.num
setup: (inputs, scope) =>
{ port, cc, range, chan } = pattern\match inputs
super
port: Input.cold port or scope\get '*midi*'
cc: Input.cold cc
range: Input.cold range or Constant.str 'uni'
chan: Input.cold chan or Constant.num -1
internal: Input.hot T.bang\mk_evt!
@state or= 0
@out or= T.num\mk_sig apply_range @inputs.range, @state
poll: =>
{ :port, :cc, :chan, :internal } = @inputs
msgs = port!.msgs
for i = #msgs, 1, -1
msg = msgs[i]
if msg.a == cc! and (chan! == -1 or msg.chan == chan!)
if msg.status == 'control-change'
@state = msg.b
internal.result\set true
return true
false
tick: =>
{ :range, :internal } = @inputs
if internal!
@out\set apply_range range, @state
vis: =>
{
type: 'bar'
bar: @state / 128
}
send_notes = Constant.meta
meta:
name: 'send-notes'
summary: "`send MIDI note events."
examples: { '(midi/send-notes [port] [chan] note-events)' }
description: "
`note-events` is a !-stream of structs with the following keys:
- `pitch`: MIDI pitch (num)
- `dur`: note duration in seconds (num)
- `vel`: MIDI velocity (num, optional)"
value: class extends Op
thin = Struct pitch: T.num, dur: T.num
thiq = Struct pitch: T.num, dur: T.num, vel: T.num
pattern = -sig['midi/out'] + -sig.num + (evt(thin) / evt(thiq))
setup: (inputs, scope) =>
{ port, chan, notes } = pattern\match inputs
@state = {}
super
port: Input.cold port or scope\get '*midi*'
notes: Input.hot notes
chan: Input.cold chan or Constant.num 0
note_off: Input.hot T.num\mk_evt!
poll: =>
time = monotime!
for pitch, endt in pairs @state
if endt <= time
@inputs.note_off.result\set pitch
return true
false
tick: =>
{ :port, :chan, :notes, :note_off } = @unwrap_all!
if notes
{ :pitch, :dur, :vel } = notes
pitch = math.floor pitch
vel = if vel then math.floor vel else 127
@state[pitch] = monotime! + dur
port\send 'note-on', chan, pitch, vel
if pitch = note_off
@state[pitch] = nil
port\send 'note-off', chan, pitch, 0
destroy: =>
{ :port, :chan } = @unwrap_all!
for pitch, endt in pairs @state
port\send 'note-off', chan, pitch, 0
Constant.meta
meta:
name: 'midi'
summary: "MIDI integration."
value:
:input
:output
:port
:gate
:trig
:cc
'send-notes': send_notes
|
