Repository navigation
Expand file tree
/
Copy pathmixer.rs
More file actions
1416 lines (1347 loc) · 59.1 KB
/
Copy pathmixer.rs
File metadata and controls
1416 lines (1347 loc) · 59.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//! Audio Track Mixer commands and the automation recorder.
//!
//! Strips are addressed by `strip` (or `track`): `"A1"` … (audio tracks), `"S1"` … (submixes),
//! `"Mix"` (the master), a track id, or a strip name. Lanes are `volume`, `pan`, `mute`,
//! `send.<i>.level` and `fx.<slot>.<param>` (see [`filmcraft_project::mixer`]).
//!
//! **Recording.** `mixer.recordStart` begins an automation pass at the playhead (the UI calls it
//! when playback starts). While it runs, `mixer.touch` / `mixer.release` are the fader gestures:
//! the audio follows the control immediately (through [`filmcraft_render::mixer::LiveMix`]) and the
//! gesture is recorded as a stream of (time, value) points. `mixer.recordStop` (playback stops)
//! thins every stream into keyframes and writes them as one undoable step, following the strip's
//! automation mode:
//!
//! | mode | records | after release |
//! |---|---|---|
//! | Off / Read | nothing (Read plays the automation) | the control returns to the automation |
//! | Latch | from the first touch | keeps writing the last value until playback stops |
//! | Touch | while touched | ramps back to the existing automation over the automatch time |
//! | Write | every control from the start of playback | keeps writing the last value until playback stops |
//!
//! With "Switch to Touch after Write" (on by default) a Write strip changes to Touch after the
//! pass.
//!
//! **Audio Clip Mixer.** Each audio track also has a Clip Mixer mode (`clipMixer.setMode`, session
//! state, Read by default). Its fader and pan knob are the lanes `clip.volume` / `clip.pan` of the
//! track (`clipMixer.touch` / `clipMixer.release`); they are heard live (the clip under the
//! playhead plays the held value) and recorded with the same Latch / Touch / Write rules, but the
//! pass writes **clip keyframes**: the Volume `level` and Panner `balance` of every clip the
//! gesture covers, in media time, thinned like track automation, with boundary keyframes that keep
//! each clip's values outside the recorded range. Without a recording pass, `mixer.touch` holds the control live and `mixer.release` commits
//! it once (a static value, or a keyframe at the playhead when the lane is automated).
use serde_json::{Value, json};
use filmcraft_project::mixer::{
self as pm, FADER_MAX_DB, FADER_MIN_DB, LANE_MUTE, LANE_PAN, LANE_VOLUME, MASTER_STRIP, lane_info, parse_fx_lane, parse_send_lane, thin_points, write_lane,
};
use filmcraft_project::{AudioChannels, AutomationMode, InputMap, ItemId, Param, ParamValue, Sequence, Track, TrackId, TrackKind, TrackSend, find_effect};
use filmcraft_time::{TICKS_PER_SECOND, Tick};
use crate::commands::{CommandSpec, always, bad, bool_p, f64_p, has_seq, str_p, time_p, u64_p};
use crate::{EngineError, Result, Session};
use filmcraft_project::mixer::{LANE_PAN51_X, LANE_PAN51_Y, PAN51_LANES};
use filmcraft_render::audio::{CLIP_LANE_PAN, CLIP_LANE_VOLUME};
type Run = fn(&mut Session, &Value) -> Result<Value>;
type Enabled = fn(&Session) -> std::result::Result<(), String>;
// ------------------------------------------------------------------------------------- recorder
/// A held value ends this long before the next move (one sample at 48 kHz).
const HOLD_EPS: Tick = Tick(TICKS_PER_SECOND / 48_000);
/// One recorded control gesture.
#[derive(Clone, Debug)]
pub struct Gesture {
pub strip: TrackId,
pub lane: String,
pub mode: AutomationMode,
/// Recorded (time, value) points.
pub points: Vec<(Tick, f64)>,
pub touching: bool,
/// Touch: released at.
pub released: Option<Tick>,
last: (Tick, f64),
}
impl Gesture {
fn new(strip: TrackId, lane: &str, mode: AutomationMode, t: Tick, v: f64) -> Self {
Gesture { strip, lane: lane.to_string(), mode, points: vec![(t, v)], touching: true, released: None, last: (t, v) }
}
/// A new value at `t`. Repeats of the same value extend the hold instead of adding points, so a
/// fader held still records a flat line, not a ramp to the next move.
fn push(&mut self, t: Tick, v: f64) {
if t < self.last.0 {
return;
}
if v == self.last.1 {
self.last.0 = t;
return;
}
if self.points.last().is_some_and(|p| self.last.0 > p.0) {
self.points.push(self.last);
}
self.points.push((t, v));
self.last = (t, v);
}
fn flush(&mut self) {
if self.points.last().is_some_and(|p| self.last.0 > p.0) {
self.points.push(self.last);
}
}
pub fn value(&self) -> f64 {
self.last.1
}
}
/// State of the current automation pass.
#[derive(Clone, Debug, Default)]
pub struct Recorder {
/// Sequence being recorded (None = no pass running).
pub seq: Option<ItemId>,
pub start: Tick,
pub gestures: Vec<Gesture>,
}
impl Recorder {
pub fn active(&self) -> bool {
self.seq.is_some()
}
fn find(&mut self, strip: TrackId, lane: &str) -> Option<&mut Gesture> {
self.gestures.iter_mut().find(|g| g.strip == strip && g.lane == lane)
}
}
/// Lanes a Write pass records on a strip (the 5.1 puck instead of pan when it feeds a 5.1 bus).
fn write_lanes(seq: &Sequence, strip: TrackId) -> &'static [&'static str] {
if strip == MASTER_STRIP {
&[LANE_VOLUME]
} else if seq.pans_51(strip) {
&[LANE_VOLUME, LANE_PAN51_X, LANE_PAN51_Y, LANE_MUTE]
} else {
&[LANE_VOLUME, LANE_PAN, LANE_MUTE]
}
}
// ------------------------------------------------------------------------------------- clip lanes
/// Whether `lane` is an Audio Clip Mixer lane (`clip.volume`, `clip.pan`).
pub fn is_clip_lane(lane: &str) -> bool {
lane == CLIP_LANE_VOLUME || lane == CLIP_LANE_PAN
}
/// The clip effect parameter behind a Clip Mixer lane.
fn clip_target(lane: &str) -> (&'static str, &'static str) {
if lane == CLIP_LANE_PAN { ("panner", "balance") } else { ("volume", "level") }
}
/// The Clip Mixer mode of an audio track (Read unless set).
pub fn clip_mode(s: &Session, track: TrackId) -> AutomationMode {
s.state.clip_mixer_modes.get(&track.0).copied().unwrap_or_default()
}
/// The clip lane value at `t`: the clip under `t` on the track (its keyframes or static value).
fn clip_underlying(tr: &Track, lane: &str, t: Tick) -> f64 {
let (eff, par) = clip_target(lane);
tr.item_at(t).and_then(|c| c.effect(eff).map(|e| e.f64_at(par, c.source_time_at(t)))).unwrap_or(0.0)
}
fn lane_underlying(tr: &Track, lane: &str, t: Tick) -> f64 {
if is_clip_lane(lane) { clip_underlying(tr, lane, t) } else { underlying(tr, lane, t) }
}
/// Parse a Clip Mixer lane from `lane` / `param` (`volume`/`level`, `pan`/`balance`).
fn clip_lane_p(p: &Value) -> String {
match str_p(p, "lane").or_else(|| str_p(p, "param")).unwrap_or("volume") {
"pan" | "balance" | "clip.pan" => CLIP_LANE_PAN.to_string(),
_ => CLIP_LANE_VOLUME.to_string(),
}
}
/// Write recorded clip-lane points (sequence time) as keyframes into every clip of `tr` they cover.
fn write_clip_points(tr: &mut Track, lane: &str, pts: &[(Tick, f64)], sr: i64) -> usize {
let (eff, par) = clip_target(lane);
let (Some(t0), Some(t1)) = (pts.first().map(|p| p.0), pts.last().map(|p| p.0)) else { return 0 };
let mut written = 0;
for c in tr.items.iter_mut().filter(|c| c.end() > t0 && c.start <= t1) {
let c0 = t0.max(c.start);
let c1 = t1.min(c.end() - Tick(1));
if c1 < c0 {
continue;
}
// points inside the clip, plus the interpolated value at its edges of the range
let at = |t: Tick| -> f64 {
let i = pts.partition_point(|p| p.0 <= t);
match (i.checked_sub(1).map(|j| pts[j]), pts.get(i)) {
(Some(a), Some(b)) if b.0 > a.0 => a.1 + (b.1 - a.1) * ((t - a.0).0 as f64 / (b.0 - a.0).0 as f64),
(Some(a), _) => a.1,
(None, Some(b)) => b.1,
(None, None) => 0.0,
}
};
let mut local: Vec<(Tick, f64)> = vec![(c0, at(c0))];
local.extend(pts.iter().copied().filter(|p| p.0 > c0 && p.0 < c1));
if c1 > c0 {
local.push((c1, at(c1)));
}
let mt: Vec<(Tick, f64)> = local.iter().map(|&(t, v)| (c.source_time_at(t), v)).collect();
let (m0, m1) = (mt[0].0.min(mt[mt.len() - 1].0), mt[0].0.max(mt[mt.len() - 1].0));
let mut mt = mt;
mt.sort_by_key(|p| p.0);
let eps = Tick::from_units(1, sr).max(Tick(1));
let starts_inside = c0 > c.start;
let ends_inside = c1 < c.end() - Tick(1);
let Some(e) = c.effect_mut(eff) else { continue };
let Some(param) = e.param_mut(par) else { continue };
let before = starts_inside.then(|| param.f64_at(m0 - eps));
let after = ends_inside.then(|| param.f64_at(m1 + eps));
write_lane(param, m0, m1, &mt, before, after, eps, false);
written += mt.len();
}
written
}
/// The lane value as automation plays it (no live overrides).
fn underlying(tr: &Track, lane: &str, t: Tick) -> f64 {
let v = tr.lane_value(lane, t);
if lane_info(lane).is_some_and(|i| i.hold) {
// hold lanes: last keyframe at or before t
if let Some(p) = tr.lane(lane).filter(|p| p.is_animated() && tr.mixer.mode.reads()) {
let i = p.keyframes.partition_point(|k| k.time <= t);
return p.keyframes[i.saturating_sub(1)].value.as_f64().unwrap_or(v);
}
}
v
}
fn clamp_lane(lane: &str, v: f64) -> f64 {
if lane == CLIP_LANE_VOLUME {
return v.clamp(FADER_MIN_DB, FADER_MAX_DB);
}
if lane == CLIP_LANE_PAN {
return v.clamp(-100.0, 100.0);
}
match lane_info(lane) {
Some(i) if i.hold => {
if v >= 0.5 {
1.0
} else {
0.0
}
}
Some(i) => v.clamp(i.min, i.max),
None => v,
}
}
fn seq_of(s: &Session, id: ItemId) -> Result<&Sequence> {
s.project.sequence(id).ok_or(EngineError::NoSequence)
}
/// Start an automation pass at `t` (playback start).
pub fn record_start(s: &mut Session, t: Tick) -> Result<Value> {
let seq_id = s.state.active_sequence.ok_or(EngineError::NoSequence)?;
let seq = seq_of(s, seq_id)?;
let mut gestures = Vec::new();
for id in seq.strip_ids() {
let Some(tr) = seq.strip(id) else { continue };
if tr.mixer.mode != AutomationMode::Write {
continue;
}
for lane in write_lanes(seq, id) {
let v = underlying(&tr, lane, t);
let mut g = Gesture::new(id, lane, AutomationMode::Write, t, v);
g.touching = false;
gestures.push(g);
}
}
// Audio Clip Mixer tracks in Write mode
for tr in &seq.audio_tracks {
if clip_mode(s, tr.id) != AutomationMode::Write {
continue;
}
for lane in [CLIP_LANE_VOLUME, CLIP_LANE_PAN] {
let mut g = Gesture::new(tr.id, lane, AutomationMode::Write, t, clip_underlying(tr, lane, t));
g.touching = false;
gestures.push(g);
}
}
s.previews.live.clear_all();
for g in &gestures {
s.previews.live.hold(g.strip, &g.lane, g.value());
}
let n = gestures.len();
s.mixrec = Recorder { seq: Some(seq_id), start: t, gestures };
Ok(json!({"recording": true, "writing": n}))
}
/// A control moved to `v` at `t`.
pub fn touch(s: &mut Session, strip: TrackId, lane: &str, v: f64, t: Tick) -> Result<Value> {
let v = clamp_lane(lane, v);
let seq_id = s.mixrec.seq.or(s.state.active_sequence).ok_or(EngineError::NoSequence)?;
let strip_mode = seq_of(s, seq_id)?.strip(strip).ok_or_else(|| bad("mixer.touch", "no such strip"))?.mixer.mode;
let mode = if is_clip_lane(lane) { clip_mode(s, strip) } else { strip_mode };
s.previews.live.hold(strip, lane, v);
if !s.mixrec.active() || !mode.writes() {
return Ok(json!({"recording": false, "value": v}));
}
match s.mixrec.find(strip, lane) {
Some(g) => {
if !g.touching {
if g.mode == AutomationMode::Touch {
// a new touch after a release: the old ramp is overwritten from here
g.released = None;
} else if t > g.last.0 {
// Write / Latch held the last value until this touch
g.last.0 = (t - HOLD_EPS).max(g.last.0);
}
}
g.touching = true;
g.push(t, v);
}
None => s.mixrec.gestures.push(Gesture::new(strip, lane, mode, t, v)),
}
Ok(json!({"recording": true, "value": v}))
}
/// A control let go at `t`.
pub fn release(s: &mut Session, strip: TrackId, lane: &str, t: Tick) -> Result<Value> {
let automatch = Tick::from_seconds_f64(s.prefs.audio.automatch_time);
if s.mixrec.active() {
if let Some(g) = s.mixrec.find(strip, lane) {
g.touching = false;
g.push(t, g.value());
if g.mode == AutomationMode::Touch {
g.released = Some(t);
s.previews.live.release(strip, lane, t, automatch);
}
// Latch / Write keep holding the last value until playback stops.
return Ok(json!({"recording": true}));
}
s.previews.live.clear(strip, lane);
return Ok(json!({"recording": false}));
}
// no pass: commit the held value once
let held = s.previews.live.get(strip, lane);
s.previews.live.clear(strip, lane);
match held {
Some(o) if is_clip_lane(lane) => {
set_clip_value(s, strip, lane, o.value, t)?;
Ok(json!({"recording": false, "value": o.value}))
}
Some(o) => {
set_value(s, strip, lane, o.value, t)?;
Ok(json!({"recording": false, "value": o.value}))
}
None => Ok(json!({"recording": false})),
}
}
/// End the pass at `t`: write every gesture as keyframes (one undo step).
pub fn record_stop(s: &mut Session, t_stop: Tick) -> Result<Value> {
let rec = std::mem::take(&mut s.mixrec);
let Some(seq_id) = rec.seq.filter(|_| !rec.gestures.is_empty()) else {
s.previews.live.clear_all();
return Ok(json!({"recording": false, "lanes": 0}));
};
let automatch = Tick::from_seconds_f64(s.prefs.audio.automatch_time);
let prefs = s.prefs.audio.clone();
let rate = seq_of(s, seq_id)?.settings.sample_rate.max(1) as i64;
let eps = Tick::from_units(1, rate).max(Tick(1));
let min_interval = if prefs.minimum_time_interval_thinning { Tick(prefs.minimum_time_ms as i64 * TICKS_PER_SECOND / 1000) } else { Tick::ZERO };
let mut written = Vec::new();
let mut keyframes = 0usize;
let result = s.edit("Write Automation", |p, _| {
let seq = p.sequence_mut(seq_id).ok_or(EngineError::NoSequence)?;
for mut g in rec.gestures {
if g.points.is_empty() {
continue;
}
let Some(tr) = seq.strip(g.strip).map(|c| c.into_owned()) else { continue };
let clip_lane = is_clip_lane(&g.lane);
let hold = !clip_lane && lane_info(&g.lane).is_some_and(|i| i.hold);
let held = g.value();
let end = match g.mode {
AutomationMode::Touch => g.released.unwrap_or(t_stop).min(t_stop.max(g.points[0].0)),
_ => t_stop,
};
g.push(end.max(g.last.0), held);
g.flush();
let mut pts = g.points.clone();
if g.mode == AutomationMode::Touch && automatch.0 > 0 && !hold {
let back = end + automatch;
pts.push((back, lane_underlying(&tr, &g.lane, back)));
}
let t0 = pts[0].0;
let t1 = pts.last().map(|p| p.0).unwrap_or(t0);
let tol = if hold {
0.0
} else if prefs.linear_keyframe_thinning {
if g.lane == LANE_PAN || g.lane == CLIP_LANE_PAN || PAN51_LANES.contains(&g.lane.as_str()) { 0.25 } else { 0.05 }
} else {
0.0
};
let thinned = thin_points(&pts, tol, min_interval, hold);
if clip_lane {
let lane = g.lane.clone();
let n = seq.mix_track_mut(g.strip).map(|tr| write_clip_points(tr, &lane, &thinned, rate)).unwrap_or(0);
keyframes += n;
written.push(json!({"strip": g.strip.0, "lane": lane, "from": t0.0, "to": t1.0, "keyframes": n, "points": pts.len(), "clips": true}));
continue;
}
let before = (t0.0 > 0).then(|| underlying(&tr, &g.lane, t0 - eps));
let after = tr.lane(&g.lane).filter(|p| p.keyframes.iter().any(|k| k.time > t1)).map(|_| underlying(&tr, &g.lane, t1 + eps));
keyframes += thinned.len();
let lane = g.lane.clone();
seq.with_strip_mut(g.strip, |tr| {
if let Some(param) = tr.lane_mut(&lane) {
write_lane(param, t0, t1, &thinned, before, after, eps, hold);
}
});
written.push(json!({"strip": g.strip.0, "lane": lane, "from": t0.0, "to": t1.0, "keyframes": thinned.len(), "points": pts.len()}));
}
if prefs.switch_to_touch_after_write {
for id in seq.strip_ids() {
seq.with_strip_mut(id, |tr| {
if tr.mixer.mode == AutomationMode::Write {
tr.mixer.mode = AutomationMode::Touch;
}
});
}
}
Ok(())
});
s.previews.live.clear_all();
s.previews.live.publish_project(s.project.clone());
result?;
Ok(json!({"recording": false, "lanes": written.len(), "keyframes": keyframes, "written": written}))
}
/// Commit a Clip Mixer value outside a pass: the clip under `t` on the track gets the value (a
/// keyframe at `t` when the parameter is animated, else its static value).
pub fn set_clip_value(s: &mut Session, track: TrackId, lane: &str, v: f64, t: Tick) -> Result<()> {
let (eff, par) = clip_target(lane);
let v = clamp_lane(lane, v);
s.edit_sequence("Audio Clip Mixer", move |q, _, _| {
let tr = q.mix_track_mut(track).ok_or_else(|| EngineError::Other("no such track".into()))?;
let idx = tr.items.iter().position(|c| c.start <= t && t < c.end()).ok_or_else(|| EngineError::Other("no clip under the playhead".into()))?;
let c = &mut tr.items[idx];
let mt = c.source_time_at(t);
let p = c.effect_mut(eff).and_then(|e| e.param_mut(par)).ok_or_else(|| EngineError::Other(format!("the clip has no {eff} effect")))?;
if p.is_animated() {
p.put_keyframe(mt, ParamValue::Float(v));
} else {
p.value = ParamValue::Float(v);
}
Ok(())
})
}
fn clip_track_p(s: &Session, p: &Value, cmd: &str) -> Result<TrackId> {
let id = strip_p(s, p, cmd)?;
if !active_seq(s)?.audio_tracks.iter().any(|t| t.id == id) {
return Err(bad(cmd, "the Audio Clip Mixer has audio tracks only"));
}
Ok(id)
}
// ------------------------------------------------------------------------------------- helpers
fn active_seq(s: &Session) -> Result<&Sequence> {
s.active_sequence().ok_or(EngineError::NoSequence)
}
/// Parse a strip reference: id, "A1", "S1", "Mix", or a strip name.
pub fn strip_ref(seq: &Sequence, v: &Value) -> Option<TrackId> {
if let Some(id) = v.as_u64() {
let id = TrackId(id);
return seq.strip(id).map(|_| id);
}
let name = v.as_str()?.trim();
if name.eq_ignore_ascii_case("mix") || name.eq_ignore_ascii_case("master") {
return Some(MASTER_STRIP);
}
let idx = |pre: &str| {
name.strip_prefix(pre).or_else(|| name.strip_prefix(&pre.to_lowercase())).and_then(|n| n.parse::<usize>().ok()).and_then(|n| n.checked_sub(1))
};
if let Some(i) = idx("A") {
return seq.audio_tracks.get(i).map(|t| t.id);
}
if let Some(i) = idx("S") {
return seq.submix_tracks.get(i).map(|t| t.id);
}
seq.audio_tracks.iter().chain(&seq.submix_tracks).find(|t| t.name.eq_ignore_ascii_case(name)).map(|t| t.id)
}
/// Display reference of a strip ("A1", "S2", "Mix").
pub fn strip_label(seq: &Sequence, id: TrackId) -> String {
if id == MASTER_STRIP {
return "Mix".into();
}
if let Some(i) = seq.audio_tracks.iter().position(|t| t.id == id) {
return format!("A{}", i + 1);
}
if let Some(i) = seq.submix_tracks.iter().position(|t| t.id == id) {
return format!("S{}", i + 1);
}
id.0.to_string()
}
fn strip_p(s: &Session, p: &Value, cmd: &str) -> Result<TrackId> {
let seq = active_seq(s)?;
let v = p.get("strip").or_else(|| p.get("track")).ok_or_else(|| bad(cmd, "need `strip` (\"A1\", \"S1\", \"Mix\" or an id)"))?;
strip_ref(seq, v).ok_or_else(|| bad(cmd, format!("no strip {v}")))
}
fn lane_p(s: &Session, p: &Value, strip: TrackId, cmd: &str) -> Result<String> {
let lane = str_p(p, "lane").unwrap_or(LANE_VOLUME).to_string();
let seq = active_seq(s)?;
let tr = seq.strip(strip).ok_or_else(|| bad(cmd, "no such strip"))?;
let ok = match parse_fx_lane(&lane) {
Some((slot, param)) => tr.effects.get(slot).and_then(|e| e.param(param)).is_some_and(|p| p.value.as_f64().is_some()),
None => lane_info(&lane).is_some() && (parse_send_lane(&lane).is_none_or(|i| i < tr.mixer.sends.len())),
};
if !ok {
return Err(bad(cmd, format!("no lane `{lane}` on this strip (volume, pan, mute, send.<i>.level, fx.<slot>.<param>)")));
}
if strip == MASTER_STRIP && (lane == LANE_PAN || lane == LANE_MUTE || PAN51_LANES.contains(&lane.as_str()) || parse_send_lane(&lane).is_some()) {
return Err(bad(cmd, "the Mix track has volume and effect lanes only"));
}
Ok(lane)
}
fn value_p(p: &Value, lane: &str, cmd: &str) -> Result<f64> {
let v = p.get("value").ok_or_else(|| bad(cmd, "need `value`"))?;
let x = v.as_f64().or_else(|| v.as_bool().map(|b| if b { 1.0 } else { 0.0 })).ok_or_else(|| bad(cmd, "`value` must be a number"))?;
Ok(clamp_lane(lane, x))
}
/// Set a control outside a recording pass: the static value, or a keyframe at `t` when the lane
/// is automated and the strip reads automation.
pub fn set_value(s: &mut Session, strip: TrackId, lane: &str, v: f64, t: Tick) -> Result<()> {
let lane = lane.to_string();
let hold = lane_info(&lane).is_some_and(|i| i.hold);
s.edit_sequence("Track Mixer Adjust", move |q, _, _| {
q.with_strip_mut(strip, |tr| {
let animated = tr.lane(&lane).is_some_and(Param::is_animated) && tr.mixer.mode.reads();
if animated {
if let Some(p) = tr.lane_mut(&lane) {
set_keyframe(p, t, v, hold);
}
} else {
tr.set_lane_static(&lane, v);
}
})
.ok_or_else(|| EngineError::Other("no such strip".into()))
})
}
fn set_keyframe(p: &mut Param, t: Tick, v: f64, hold: bool) {
p.put_keyframe(t, ParamValue::Float(v));
if hold {
for k in p.keyframes.iter_mut() {
k.interp = filmcraft_project::Interpolation::Hold;
}
}
}
fn mode_p(p: &Value) -> Option<AutomationMode> {
str_p(p, "mode").and_then(AutomationMode::from_name)
}
pub(crate) fn channels_name(c: AudioChannels) -> &'static str {
match c {
AudioChannels::Mono => "Mono",
AudioChannels::Stereo => "Stereo",
AudioChannels::Surround51 => "5.1",
AudioChannels::Adaptive => "Adaptive",
}
}
/// Parse a channel format / track type name (`Mono`, `Stereo` or `Standard`, `5.1`, `Adaptive`).
pub(crate) fn channels_from(s: &str) -> Option<AudioChannels> {
match s.to_ascii_lowercase().as_str() {
"mono" => Some(AudioChannels::Mono),
"stereo" | "standard" => Some(AudioChannels::Stereo),
"5.1" | "surround51" => Some(AudioChannels::Surround51),
"adaptive" => Some(AudioChannels::Adaptive),
_ => None,
}
}
/// JSON view of one strip at time `t`.
pub fn strip_json(s: &Session, seq: &Sequence, id: TrackId, t: Tick) -> Value {
let Some(tr) = seq.strip(id) else { return Value::Null };
let live = &s.previews.live;
let shown = |lane: &str| live.get(id, lane).map(|o| o.value).unwrap_or_else(|| underlying(&tr, lane, t));
let lanes: serde_json::Map<String, Value> = tr
.automated_lanes()
.into_iter()
.map(|k| {
let kf: Vec<Value> = tr.lane_keyframes(&k).iter().map(|kf| json!([kf.time.0, kf.value.as_f64()])).collect();
(k, Value::Array(kf))
})
.collect();
let kind = if id == MASTER_STRIP {
"mix"
} else if seq.submix_tracks.iter().any(|t| t.id == id) {
"submix"
} else {
"audio"
};
json!({
"id": id.0,
"ref": strip_label(seq, id),
"name": tr.name,
"kind": kind,
"channels": channels_name(tr.channels),
"mode": tr.mixer.mode.label(),
"volumeDb": tr.volume_db,
"pan": tr.pan,
"muted": tr.muted,
"solo": tr.solo,
"recordArm": tr.mixer.record_arm,
"soloSafe": tr.mixer.solo_safe,
"inputMap": tr.mixer.input_map.label(),
"output": tr.mixer.output.map(|o| strip_label(seq, o)).unwrap_or_else(|| if id == MASTER_STRIP { String::new() } else { "Mix".into() }),
"inserts": tr.effects.iter().enumerate().map(|(i, e)| json!({"slot": i, "effect": e.effect, "name": e.def().map(|d| d.name).unwrap_or(""), "enabled": e.enabled, "postFader": e.post_fader, "params": insert_params(e)})).collect::<Vec<_>>(),
"sends": tr.mixer.sends.iter().enumerate().map(|(i, sd)| json!({"send": i, "target": strip_label(seq, sd.target), "levelDb": sd.level_db, "pan": sd.pan, "preFader": sd.pre_fader, "muted": sd.muted})).collect::<Vec<_>>(),
"at": {"time": t.0, "volumeDb": shown(LANE_VOLUME), "pan": shown(LANE_PAN), "mute": shown(LANE_MUTE) >= 0.5},
"outputChannels": channels_name(seq.output_channels(id)),
"pans51": seq.pans_51(id),
"pan51": {"x": shown(LANE_PAN51_X), "y": shown(LANE_PAN51_Y), "center": shown(pm::LANE_PAN51_CENTER), "lfeDb": shown(pm::LANE_PAN51_LFE)},
"lanes": lanes,
})
}
fn inspect(s: &mut Session, p: &Value) -> Result<Value> {
let t = time_p(s, p, "").unwrap_or(s.playhead());
let seq = active_seq(s)?;
let strips: Vec<Value> = seq.strip_ids().into_iter().map(|id| strip_json(s, seq, id, t)).collect();
Ok(json!({
"strips": strips,
"recording": s.mixrec.active(),
"gestures": s.mixrec.gestures.iter().map(|g| json!({"strip": strip_label(seq, g.strip), "lane": g.lane, "mode": g.mode.label(), "touching": g.touching, "points": g.points.len(), "value": g.value()})).collect::<Vec<_>>(),
"latencySamples": filmcraft_render::mixer::graph_latency(seq),
"automatchTime": s.prefs.audio.automatch_time,
"clipModes": seq.audio_tracks.iter().map(|t| json!({"track": strip_label(seq, t.id), "mode": clip_mode(s, t.id).label()})).collect::<Vec<_>>(),
}))
}
fn set_strip(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.setStrip")?;
let seq = active_seq(s)?;
let output = match p.get("output") {
None => None,
Some(Value::Null) => Some(None),
Some(v) => {
let o = strip_ref(seq, v).ok_or_else(|| bad("mixer.setStrip", format!("no output {v}")))?;
if o == MASTER_STRIP {
Some(None)
} else if o == id || !seq.submix_tracks.iter().any(|t| t.id == o) {
return Err(bad("mixer.setStrip", "output must be the Mix or a submix"));
} else if seq
.submix_tracks
.iter()
.position(|t| t.id == id)
.is_some_and(|me| seq.submix_tracks.iter().position(|t| t.id == o).is_some_and(|it| it <= me))
{
return Err(bad("mixer.setStrip", "a submix can only feed a submix after it (no feedback)"));
} else {
Some(Some(o))
}
}
};
let p = p.clone();
s.edit_sequence("Track Mixer Settings", move |q, _, _| {
q.with_strip_mut(id, |t| {
if let Some(v) = str_p(&p, "name") {
t.name = v.to_string();
}
if let Some(v) = f64_p(&p, "volumeDb") {
t.volume_db = v.clamp(FADER_MIN_DB, FADER_MAX_DB);
}
if let Some(v) = f64_p(&p, "pan") {
t.pan = v.clamp(-100.0, 100.0);
}
if let Some(v) = bool_p(&p, "muted") {
t.muted = v;
}
if let Some(v) = bool_p(&p, "solo") {
t.solo = v;
}
if let Some(v) = bool_p(&p, "recordArm") {
t.mixer.record_arm = v;
}
if let Some(v) = bool_p(&p, "soloSafe") {
t.mixer.solo_safe = v;
}
if let Some(m) = mode_p(&p) {
t.mixer.mode = m;
}
if let Some(m) = str_p(&p, "inputMap").and_then(InputMap::from_name) {
t.mixer.input_map = m;
}
if let Some(c) = str_p(&p, "channels").and_then(channels_from) {
t.channels = c;
}
if let Some(o) = output {
t.mixer.output = o;
}
})
.ok_or_else(|| EngineError::Other("no such strip".into()))
})?;
let seq = active_seq(s)?;
Ok(strip_json(s, seq, id, s.playhead()))
}
fn add_submix(s: &mut Session, p: &Value) -> Result<Value> {
let name = str_p(p, "name").map(str::to_string);
let channels = str_p(p, "channels").and_then(channels_from).unwrap_or(AudioChannels::Stereo);
let seq_id = s.state.active_sequence.ok_or(EngineError::NoSequence)?;
let id = s.edit("Add Submix Track", |pr, _| {
let id = TrackId(pr.alloc_id());
let seq = pr.sequence_mut(seq_id).ok_or(EngineError::NoSequence)?;
let n = seq.submix_tracks.len() + 1;
let mut t = Track::new(id, TrackKind::Audio, name.unwrap_or_else(|| format!("Submix {n}")));
t.channels = channels;
seq.submix_tracks.push(t);
Ok(id)
})?;
let seq = active_seq(s)?;
Ok(json!({"id": id.0, "ref": strip_label(seq, id)}))
}
fn delete_submix(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.deleteSubmix")?;
if !active_seq(s)?.submix_tracks.iter().any(|t| t.id == id) {
return Err(bad("mixer.deleteSubmix", "not a submix"));
}
s.edit_sequence("Delete Submix Track", move |q, _, _| {
q.submix_tracks.retain(|t| t.id != id);
// re-route everything that fed it to the Mix and drop sends to it
for sid in q.strip_ids() {
q.with_strip_mut(sid, |t| {
if t.mixer.output == Some(id) {
t.mixer.output = None;
}
while let Some(i) = t.mixer.sends.iter().position(|sd| sd.target == id) {
t.remove_send(i);
}
});
}
Ok(())
})?;
Ok(Value::Null)
}
fn slot_p(p: &Value, cmd: &str) -> Result<usize> {
u64_p(p, "slot").map(|v| v as usize).ok_or_else(|| bad(cmd, "need `slot` (0-based)"))
}
/// An insert's scalar parameter values (numbers; toggles as booleans) for `mixer.inspect`.
fn insert_params(e: &filmcraft_project::EffectInstance) -> Value {
let mut m = serde_json::Map::new();
for (k, p) in &e.params {
let v = match &p.value {
ParamValue::Bool(b) => json!(b),
v => v.as_f64().map_or(Value::Null, |x| json!(x)),
};
m.insert(k.clone(), v);
}
Value::Object(m)
}
fn add_insert(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.addInsert")?;
let eid = str_p(p, "effect").ok_or_else(|| bad("mixer.addInsert", "need `effect` (an audio effect id)"))?;
let def = find_effect(eid)
.filter(|d| d.kind == filmcraft_project::EffectKind::Audio && !d.intrinsic)
.ok_or_else(|| bad("mixer.addInsert", format!("`{eid}` is not an audio effect")))?;
let mut inst = def.instance();
inst.post_fader = bool_p(p, "postFader").unwrap_or(false);
let slot = u64_p(p, "slot").map(|v| v as usize);
let n = active_seq(s)?.strip(id).map(|t| t.effects.len()).unwrap_or(0);
if n >= pm::MAX_INSERTS {
return Err(bad("mixer.addInsert", format!("all {} effect slots are in use", pm::MAX_INSERTS)));
}
let at = slot.unwrap_or(n).min(n);
s.edit_sequence(&format!("Add Track Effect {}", def.name), move |q, _, _| {
q.with_strip_mut(id, |t| t.effects.insert(at, inst)).ok_or_else(|| EngineError::Other("no such strip".into()))
})?;
Ok(json!({"slot": at}))
}
fn remove_insert(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.removeInsert")?;
let slot = slot_p(p, "mixer.removeInsert")?;
let ok = s.edit_sequence("Remove Track Effect", move |q, _, _| Ok(q.with_strip_mut(id, |t| t.remove_insert(slot)).unwrap_or(false)))?;
if !ok {
return Err(bad("mixer.removeInsert", "no effect in that slot"));
}
Ok(Value::Null)
}
fn set_insert(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.setInsert")?;
let slot = slot_p(p, "mixer.setInsert")?;
let p = p.clone();
s.edit_sequence("Track Effect Settings", move |q, _, _| {
q.with_strip_mut(id, |t| -> Result<()> {
let e = t.effects.get_mut(slot).ok_or_else(|| bad("mixer.setInsert", "no effect in that slot"))?;
if let Some(v) = bool_p(&p, "enabled") {
e.enabled = v;
}
if let Some(v) = bool_p(&p, "postFader") {
e.post_fader = v;
}
if let Some(obj) = p.get("params").and_then(Value::as_object) {
for (k, v) in obj {
// instances saved before a parameter existed get it from the definition
if e.param(k).is_none()
&& let Some(d) = e.def().and_then(|d| d.param(k))
{
e.params.insert(k.clone(), filmcraft_project::Param::new(d.default.clone()));
}
let par = e.param_mut(k).ok_or_else(|| bad("mixer.setInsert", format!("no parameter `{k}`")))?;
par.value = match (&par.value, v) {
(ParamValue::Bool(_), Value::Bool(b)) => ParamValue::Bool(*b),
(ParamValue::Choice(_), v) => ParamValue::Choice(v.as_u64().unwrap_or(0) as u32),
(_, v) => ParamValue::Float(v.as_f64().ok_or_else(|| bad("mixer.setInsert", format!("`{k}` needs a number")))?),
};
}
}
Ok(())
})
.ok_or_else(|| EngineError::Other("no such strip".into()))?
})?;
Ok(Value::Null)
}
fn send_target(s: &Session, p: &Value, id: TrackId, cmd: &str) -> Result<TrackId> {
let seq = active_seq(s)?;
let v = p.get("target").ok_or_else(|| bad(cmd, "need `target` (a submix)"))?;
let t = strip_ref(seq, v).filter(|t| seq.submix_tracks.iter().any(|x| x.id == *t)).ok_or_else(|| bad(cmd, "`target` must be a submix"))?;
let pos = |x: TrackId| seq.submix_tracks.iter().position(|y| y.id == x);
if t == id || pos(id).is_some_and(|me| pos(t).is_some_and(|it| it <= me)) {
return Err(bad(cmd, "a submix can only send to a submix after it (no feedback)"));
}
Ok(t)
}
fn add_send(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.addSend")?;
if id == MASTER_STRIP {
return Err(bad("mixer.addSend", "the Mix track has no sends"));
}
let target = send_target(s, p, id, "mixer.addSend")?;
let mut snd = TrackSend::new(target);
snd.level_db = f64_p(p, "levelDb").unwrap_or(0.0).clamp(FADER_MIN_DB, FADER_MAX_DB);
snd.pre_fader = bool_p(p, "preFader").unwrap_or(false);
snd.pan = f64_p(p, "pan").unwrap_or(0.0).clamp(-100.0, 100.0);
if active_seq(s)?.strip(id).is_some_and(|t| t.mixer.sends.len() >= pm::MAX_SENDS) {
return Err(bad("mixer.addSend", format!("all {} send slots are in use", pm::MAX_SENDS)));
}
let i = s.edit_sequence("Add Send", move |q, _, _| {
q.with_strip_mut(id, |t| {
t.mixer.sends.push(snd);
t.mixer.sends.len() - 1
})
.ok_or_else(|| EngineError::Other("no such strip".into()))
})?;
Ok(json!({"send": i}))
}
fn set_send(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.setSend")?;
let i = u64_p(p, "send").ok_or_else(|| bad("mixer.setSend", "need `send` (0-based)"))? as usize;
let target = if p.get("target").is_some() { Some(send_target(s, p, id, "mixer.setSend")?) } else { None };
let p = p.clone();
s.edit_sequence("Send Settings", move |q, _, _| {
q.with_strip_mut(id, |t| -> Result<()> {
let sd = t.mixer.sends.get_mut(i).ok_or_else(|| bad("mixer.setSend", "no such send"))?;
if let Some(v) = f64_p(&p, "levelDb") {
sd.level_db = v.clamp(FADER_MIN_DB, FADER_MAX_DB);
}
if let Some(v) = f64_p(&p, "pan") {
sd.pan = v.clamp(-100.0, 100.0);
}
if let Some(v) = bool_p(&p, "preFader") {
sd.pre_fader = v;
}
if let Some(v) = bool_p(&p, "muted") {
sd.muted = v;
}
if let Some(t) = target {
sd.target = t;
}
Ok(())
})
.ok_or_else(|| EngineError::Other("no such strip".into()))?
})?;
Ok(Value::Null)
}
fn remove_send(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.removeSend")?;
let i = u64_p(p, "send").ok_or_else(|| bad("mixer.removeSend", "need `send` (0-based)"))? as usize;
let ok = s.edit_sequence("Remove Send", move |q, _, _| Ok(q.with_strip_mut(id, |t| t.remove_send(i)).unwrap_or(false)))?;
if !ok {
return Err(bad("mixer.removeSend", "no such send"));
}
Ok(Value::Null)
}
fn set_kf(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.setKeyframe")?;
let lane = lane_p(s, p, id, "mixer.setKeyframe")?;
let t = time_p(s, p, "").unwrap_or(s.playhead());
let v = value_p(p, &lane, "mixer.setKeyframe")?;
let hold = lane_info(&lane).is_some_and(|i| i.hold);
s.edit_sequence("Add Track Keyframe", move |q, _, _| {
q.with_strip_mut(id, |tr| {
if let Some(par) = tr.lane_mut(&lane) {
if par.keyframes.is_empty() {
// the first keyframe keeps the current value everywhere else
let cur = par.value.as_f64().unwrap_or(v);
par.value = ParamValue::Float(cur);
}
set_keyframe(par, t, v, hold);
}
})
.ok_or_else(|| EngineError::Other("no such strip".into()))
})?;
Ok(json!({"time": t.0, "value": v}))
}
fn delete_kf(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.deleteKeyframe")?;
let lane = lane_p(s, p, id, "mixer.deleteKeyframe")?;
let t = time_p(s, p, "").ok_or_else(|| bad("mixer.deleteKeyframe", "need `time`"))?;
let ok = s.edit_sequence("Delete Track Keyframe", move |q, _, _| {
Ok(q.with_strip_mut(id, |tr| tr.lane_mut(&lane).is_some_and(|par| par.remove_keyframe_at(t))).unwrap_or(false))
})?;
if !ok {
return Err(bad("mixer.deleteKeyframe", "no keyframe at that time"));
}
Ok(Value::Null)
}
fn move_kf(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.moveKeyframe")?;
let lane = lane_p(s, p, id, "mixer.moveKeyframe")?;
let t = time_p(s, p, "").ok_or_else(|| bad("mixer.moveKeyframe", "need `time` (the keyframe)"))?;
let nt = time_p(s, p, "new");
let nv = p.get("value").map(|_| value_p(p, &lane, "mixer.moveKeyframe")).transpose()?;
let ok = s.edit_sequence("Move Track Keyframe", move |q, _, _| {
Ok(q.with_strip_mut(id, |tr| {
let Some(par) = tr.lane_mut(&lane) else { return false };
let Ok(i) = par.keyframes.binary_search_by_key(&t, |k| k.time) else { return false };
let mut k = par.keyframes.remove(i);
if let Some(nt) = nt {
// keep keyframe order: clamp between the neighbours
let lo = i.checked_sub(1).map(|j| par.keyframes[j].time + Tick(1)).unwrap_or(Tick::ZERO);
let hi = par.keyframes.get(i).map(|n| n.time - Tick(1)).unwrap_or(Tick(i64::MAX));
k.time = nt.clamp(lo, hi);
}
if let Some(v) = nv {
k.value = ParamValue::Float(v);
}
let j = par.keyframes.partition_point(|x| x.time < k.time);
par.keyframes.insert(j, k);
true
})
.unwrap_or(false))
})?;
if !ok {
return Err(bad("mixer.moveKeyframe", "no keyframe at that time"));
}
Ok(Value::Null)
}
fn clear_lane(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.clearLane")?;
let lane = lane_p(s, p, id, "mixer.clearLane")?;
let t = s.playhead();
s.edit_sequence("Clear Track Keyframes", move |q, _, _| {
q.with_strip_mut(id, |tr| {
let v = tr.lane_value(&lane, t);
if let Some(par) = tr.lane_mut(&lane) {
par.keyframes.clear();
}
tr.set_lane_static(&lane, v);
if parse_fx_lane(&lane).is_none() {
tr.mixer.lanes.remove(&lane);
}
})
.ok_or_else(|| EngineError::Other("no such strip".into()))
})?;
Ok(Value::Null)
}
fn write_automation(s: &mut Session, p: &Value) -> Result<Value> {
let id = strip_p(s, p, "mixer.writeAutomation")?;
let lane = lane_p(s, p, id, "mixer.writeAutomation")?;
let pts: Vec<(Tick, f64)> = p
.get("points")
.and_then(Value::as_array)
.ok_or_else(|| bad("mixer.writeAutomation", "need `points`: [[ticks, value], …]"))?
.iter()
.filter_map(|v| Some((Tick(v.get(0)?.as_i64()?), clamp_lane(&lane, v.get(1)?.as_f64()?))))
.collect();
if pts.is_empty() {
return Err(bad("mixer.writeAutomation", "no points"));
}
let hold = lane_info(&lane).is_some_and(|i| i.hold);
let tol = f64_p(p, "tolerance").unwrap_or(if hold { 0.0 } else { 0.05 });
let thinned = thin_points(&pts, tol, Tick::ZERO, hold);
let (t0, t1) = (thinned[0].0, thinned[thinned.len() - 1].0);
let rate = active_seq(s)?.settings.sample_rate.max(1) as i64;