Hi sqweek,
2018-04-18 11:10 GMT+02:00 sqweek <sqw...@gmail.com>:
> ie. there's a hard realtime requirement here in some usages - is it still
possible to meet that requirement with the samples being loaded/unloaded?
No, with samples being loaded and unloaded on demand, requirements like
guaranteed immediate availability of selected presets are not possible, of
course. That is actually partly a feature of this idea. Distributing the
time it takes to load the whole Soundfont and shifting it back to the point
when a preset is actually selected. And yes, that is not useful or even
harmful in many situations. But in some situations, it's just what will
make users happy. :-)
Please understand that the dynamic sample loading is an optional feature
and is disabled by default. So for "hard realtime" requirements, you simply
don't switch on the feature.
> I'm not a midi expert so please forgive the vagueness of the question.
>From what you've written I guess the performer can setup presets for all
required instruments and then switch between them without any loading
having to take place? That seems ok to me, but is perhaps still surprising
to a performer who is used to everything being available once the soundfont
is loaded.
Actually, the current implementation in the dynamic-sample-loading branch
always unloads samples if a preset is not used on any channel anymore.
But we've been discussing an additional feature that would scan a MIDI
file, look for program change events and then preload all presets in those
events before starting playback. So we would need to add a "preload"
function anyway. If we expose this function via the Fluidsynth shell and
add a "--sticky" argument (which would keep the samples in memory until the
Soundfont is completely unloaded), we basically have the best of both
worlds. Musicians could use that command to do exactly what you propose:
preload all required presets before the performance and still have the
advantage of lower memory consumption.
Either that, or have two modes for dynamic-sample-loading: "fully dynamic"
(load and unload on demand) or "lazy load" (load on demand but only unload
when Soundfont is unloaded).
Cheers,
Marcus
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