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| magnetophon | Hi, could someone comment on this issue: https://bitbucket.org/agraef/faust-lv2/issues/9/feature-request-latency-compensation-meta | 15:49 |
|---|---|---|
| magnetophon | I asked for latency-compensation in faust2lv2, but neither the author nor me knows how to do it, or where to find the specs. | 15:50 |
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| drobilla | magnetophon: done | 17:19 |
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| magnetophon | drobilla: thanks | 17:39 |
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| drobilla | n/p | 17:53 |
| ssj71 | do any hosts tend to send the same tempo over and over, or does it only come when tempo changes? | 18:13 |
| ventosus | ssj71: yes, some do | 18:22 |
| ventosus | qtractor sends an update at least once per beat or upon change | 18:22 |
| ssj71 | ok, then its probably worth a check | 18:22 |
| ventosus | ardour sends updates like crazy, e.g. every other period or so | 18:22 |
| ssj71 | they always send the whole time_position structure thing? | 18:22 |
| ventosus | yes | 18:22 |
| ssj71 | alright | 18:22 |
| ventosus | jalv only sends something upon change, iirc | 18:22 |
| ssj71 | IMHO thats how it should be done | 18:23 |
| ventosus | I was told by rgareus that plugins can get out of sync | 18:23 |
| ventosus | an update once per beat as does qtractor seems sensible to me | 18:24 |
| ssj71 | leap frames I guess | 18:24 |
| rgareus | rounding issues | 18:24 |
| ssj71 | ye | 18:24 |
| ssj71 | s | 18:24 |
| rgareus | much less of an issue with jalv (since jack transport does not vari-speed) | 18:25 |
| rgareus | "once per beat" assume you do actually have musical time | 18:26 |
| rgareus | which may not be the case. it can also just be samples | 18:26 |
| rgareus | think timecode | 18:26 |
| ssj71 | if you don't have musical time does the position matter? | 18:26 |
| rgareus | and once per beat is way too often | 18:26 |
| ssj71 | bpm speed beats etc | 18:27 |
| ssj71 | I guess speed yes | 18:27 |
| ssj71 | but then only change seems sufficient | 18:27 |
| ssj71 | *on change | 18:27 |
| rgareus | ssj71: loop points for example are usually samples (not BBT) | 18:27 |
| ssj71 | hmm | 18:28 |
| rgareus | in theory a notification is only needed when a setting changes (bpm, transport-speed, position/bar-beat, metrum = beats/bar) | 18:29 |
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| rgareus | if a plugin uses a double to count bar-beat internally it's also safe for a long time. | 18:31 |
| rgareus | but vari-speed + sample-count is hard. Ardour for example uses cubic interpolation and keeps track of the sub-sample phase. | 18:32 |
| rgareus | other hosts may do different things | 18:32 |
| ssj71 | I just plan on everything breaking if using varispeed :) | 18:33 |
| drobilla | We probably need to forge (hah!) proper rules for this | 18:34 |
| rgareus | IIRC ardour does send an update every cycle during vari-speed | 18:37 |
| rgareus | what I use in plugins to keep track: self->bar_beats += n_samples * self->host_bpm * self->host_speed / (60.f * self->sample_rate); | 18:40 |
| rgareus | self->bar_beats == val(LV2_TIME__bar) * val(LV2_TIME__beatsPerBar) + val (LV2_TIME__barBeat) | 18:43 |
| rgareus | that can fail when beatsPerBar changes, though | 18:44 |
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| rgareus | VST and AU requires the host to re-map things to quarter notes. sonuds odd, but is kinda handy, really | 18:45 |
| rgareus | something to keep in mind for LV3 | 18:45 |
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| * drobilla doesn't get what "re-map things to quarter notes" means | 19:28 | |
| rgareus | the "B" in BPM is always a quarter-note, regardles of actual metrum | 19:31 |
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| grejppi | hey, would an lv2:symbol on an lv2:Parameter make any sense? | 20:05 |
| drobilla | Sure. Yet another thing we probably need rules about | 20:09 |
| drobilla | I have thought a bit about this, because "everything I/O thingie has a unique symbol" is an important guarantee of LV2 | 20:10 |
| drobilla | and if we're going to start using parameters for control, well.. | 20:10 |
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| grejppi | thanks! I'm slowly getting back to lv2 in lmms. I wonder if there's an equivalent for port properties? lv2:integer and lv2:toggled can be represented by atom:Int and atom:Bool, but is there a way to specify if values should be logarithmic for example? or scale points? | 20:19 |
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