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import Constant, Op, Input, T, any, sig, evt from require 'alv.base'
al = require 'abletonlink'
clock = Constant.meta
meta:
name: 'clock'
summary: "Create a clock source."
examples: { '(clock [synced] [bpm] [fps])' }
description: "Creates a new `link/clock~` stream.
The clock event stream is an IO that triggers other operators at a fixed
frame rate.
- `synced` has to be a bool~ constant and defaults to `false`.
- `bpm` should be a num~ stream and defaults to `120`.
- `fps` has to be a num= constant and defaults to `60` if omitted."
value: class extends Op
setup: (inputs) =>
{ synced, bpm, fps } = (sig.bool + -sig.num + -sig.num)\match inputs
super
synced: Input.hot synced or Constant.bool false
bpm: Input.hot bpm or Constant.num 120
fps: Input.hot fps or Constant.num 60
io: Input.hot T.bang\mk_evt!
@setup_out '~', T['link/clock']
@state or= {
link: al.create 120
state: al.create_session_state!
}
@state.time or= @state.link\clock_micros!
poll: =>
time = @state.link\clock_micros!
dt = time - @state.time
ft = 1 / @inputs.fps!
if dt >= ft and not @inputs.io.result\dirty!
@state.state = al.create_session_state!
@state.link\capture_app_session_state @state.state
@inputs.io.result\set true
true
tick: (setup) =>
{ :link, :time, :state } = @state
if @inputs.synced\dirty!
link\enable @inputs.synced!
if @inputs.bpm\dirty!
state\set_tempo @inputs.bpm!, time
link\commit_app_session_state state
if setup or @inputs.io\dirty!
time = link\clock_micros!
dt = time - @state.time
@state.time = time
@out\set :time, :state, :dt
every = Constant.meta
meta:
name: 'every'
summary: "Emit events regularly."
examples: { '(every [clock] period [phase] [evt])' }
description: "Emits `evt` as an event once every `period` beats.
- `clock` should be a `link/clock~` stream. This argument can be omitted
and the stream be passed as a dynamic definition in `*clock*` instead.
- `period` should be a num~ stream.
- `phase` should be a num~ stream and defaults to 0.
- `evt` can be a value of any type. It defaults to `bang`.
- the return type will be an event stream with the same type as `evt`."
value: class extends Op
pattern = -sig['link/clock'] + sig.num + -sig.num + -sig!
setup: (inputs, scope) =>
{ clock, period, phase, evt } = pattern\match inputs
super
clock: Input.hot clock or scope\get '*clock*'
period: Input.cold period
phase: Input.cold phase or Constant.num 0
evt: Input.cold evt or T.bang\mk_const true
@setup_out '!', @inputs.evt\type!
tick: =>
{ :clock, :period, :phase, :evt } = @unwrap_all!
return if period == 0
pre = clock.state\phase_at_time clock.time - clock.dt, period
post = clock.state\phase_at_time clock.time, period
pre = (pre + period - phase) % period
post = (post + period - phase) % period
if post < pre
@out\set evt
lfo = Constant.meta
meta:
name: 'lfo'
summary: "Low-frequency oscillator."
examples: { '(lfo [clock] period [phase] [wave])' }
description: "Oscillates betwen `0` and `1` once every `period` beats.
- `clock` should be a `link/clock~` stream. This argument can be omitted
and the stream be passed as a dynamic definition in `*clock*` instead.
- `freq` should be a num~ stream.
- `phase` should be a num~ stream and defaults to 0.
- `wave` selects the wave shape from one of the following:
- `'sin'` (the default)
- `'saw'`
- `'tri'`"
value: class extends Op
pattern = -sig['link/clock'] + sig.num + -sig.num + -sig.str
setup: (inputs, scope) =>
{ clock, period, phase, wave } = pattern\match inputs
super
clock: Input.hot clock or scope\get '*clock*'
period: Input.cold period
phase: Input.cold phase or Constant.num 0
wave: Input.cold wave or Constant.str 'sin'
@state or= 0
@setup_out '~', T.num
tau = math.pi * 2
tick: =>
{ :clock, :period, :phase, :wave } = @unwrap_all!
t = clock.state\phase_at_time clock.time, period
t = (t - phase) / period % 1
@out\set switch wave
when 'sin' then .5 + .5 * math.cos t * tau
when 'saw' then t
when 'tri' then math.abs (2*t % 2) - 1
else error Error 'argument', "unknown wave type '#{wave}'"
vis: => type: 'bar', bar: @.out!
ramp = Constant.meta
meta:
name: 'ramp'
summary: "Sawtooth LFO."
examples: { '(ramp [clock] period [phase] [max])' }
description: "Ramps from `0` to `max` once every `period` beats.
- `clock` should be a `time/clock!` stream. This argument can be omitted
and the stream be passed as a dynamic definition in `*clock*` instead.
- `period` should be a num~ stream.
- `phase` should be a num~ stream and defaults to 0.
- `max` should be a num~ stream and defaults to `period` if omitted."
value: class extends Op
pattern = -sig['link/clock'] + sig.num + -sig.num + -sig.num
setup: (inputs, scope) =>
{ clock, period, phase, max } = pattern\match inputs
super
clock: Input.hot clock or scope\get '*clock*'
period: Input.cold period
phase: Input.cold phase or Constant.num 0
max: max and Input.cold max
@setup_out '~', T.num, 0
tick: =>
{ :clock, :period, :phase, :max } = @unwrap_all!
t = clock.state\phase_at_time clock.time, period
t = (t - phase) / period % 1
max or= period
@out\set t * max
vis: => type: 'bar', bar: @state
tick = Constant.meta
meta:
name: 'tick'
summary: "Count ticks."
examples: { '(tick [clock] period [phase])' }
description: "Counts upwards by one every `period` beats.
- `clock` should be a `link/clock~` stream. This argument can be omitted
and the stream be passed as a dynamic definition in `*clock*` instead.
- `period` should be a num~ stream and defaults to 1.
- `phase` should be a num~ stream and defaults to 0.
- returns a `num~` stream that increases by 1 every `period`."
value: class extends Op
pattern = -sig['link/clock'] + -sig.num + -sig.num
setup: (inputs, scope) =>
{ clock, period, phase } = pattern\match inputs
super
clock: Input.hot clock or scope\get '*clock*'
period: Input.cold period or Constant.num 0
phase: Input.cold phase or Constant.num 0
@setup_out '~', T.num, 0
tick: =>
{ :clock, :period, :phase, :evt } = @unwrap_all!
return if period == 0
pre = clock.state\phase_at_time clock.time - clock.dt, period
post = clock.state\phase_at_time clock.time, period
pre = (pre + period - phase) % period
post = (post + period - phase) % period
if post < pre
@out\set @.out! + 1
vis: => type: 'event'
Constant.meta
meta:
name: 'link-time'
summary: "Musical time with Ableton Link."
value:
:clock
:every
:lfo
:ramp
:tick
|
