Hosting Slate VCC, FG-X

[zabukowski]

I am experimenting with VST hosting in my app. So far I've managed to load and process audio thru many diff plugins (PSP, IKMultimedia, Nebula etc. etc.) without noticeable problems.

I have a problem with Slate VCC and FG-X, though. They load ok, controls are working. The only thing is that meters are not working, regardless of input signal.

VTM is surprisingly working

Does anyone know - do Slate plugins require some kind of special treatment ??

Thanks in advance!
Zabukowski

[murnau]

have recently purchased exact the same plugins (VCC and FG-X)and no special treatment here. everything works as expected: sorry, i cant help! maybe it's a graphic card issue on your side?

[zabukowski]

Have you programmed your own VST host? Plugins are working in other hosts, not working in mine, so i am trying to find a solution ...

[murnau]

Yes of course.

[zabukowski]

Ok, thanks for info

I don't have much experience with VST hosting, so i guess i am doing something wrong here. But strangely, all other plugins are working, including Slate VTM.

Again, processing is working, knobs are working, only meters are dead.

I don't suspect graphic card problem, because these problems are not present in other hosts. Definitively VCC/FG-X are somehow different.

I have editor opened in main thread and processing is done in a separate, audio dedicated thread.

If you have any ideas what can cause this problems, please let me know!

Thanks for help!
Zabukowski

[arakula]

Either you don't send effEditIdle or you don't process audioMasterIdle.

[zabukowski]

Either you don't send effEditIdle or you don't process audioMasterIdle.

Hm, actually i do both - i guess other plugins shouldn't be working otherwise ?

if (opcode == audioMasterIdle) {
if (effect)
effect->dispatcher(effect, effEditIdle, 0, 0, 0, 0);

...


SetTimer (hwnd, 1, 20, 0);

case WM_TIMER :
if (effect)
effect->dispatcher (effect, effEditIdle, 0, 0, 0, 0);
break;

...

I noticed VCC use audioMasterGetCurrentProcessLevel. I've tried to return every possible value with no sucess (from host callback)

Thanks!
Zabukowski

[arakula]

if (opcode == audioMasterIdle) {
if (effect)
effect->dispatcher(effect, effEditIdle, 0, 0, 0, 0);

...

That's no good idea. You've just been called by the PlugIn to do your idle stuff. That's a good time to process pending screen updates (on Windows, that would mean processing queued WM_PAINT and WM_NCPAINT messages), but calling the PlugIn with effEditIdle from within the callback is rather useless.

[zabukowski]

if (opcode == audioMasterIdle) {
if (effect)
effect->dispatcher(effect, effEditIdle, 0, 0, 0, 0);

...

That's no good idea. You've just been called by the PlugIn to do your idle stuff. That's a good time to process pending screen updates (on Windows, that would mean processing queued WM_PAINT and WM_NCPAINT messages), but calling the PlugIn with effEditIdle from within the callback is rather useless.

Yes, i agree. I've just added this looking at Teragon MrsWatson code, it has no effect, though.

My app is using QT framework and i use standard Windows dialog for effect windows. Maybe there are some problems related to this, but again, only for mentioned plugins.

[zabukowski]

Ups, i was not aware that Arakula stands for Herman Seib !!!!

Respect, your VSTHOST is a great piece of software and invaluable resource for developers.

Big thank you !!!!!

Unfortunately i am still stuck with non working meters on VCC & FG-X. I've dig into VST host and Audacity sources and just can't find something reated, which could make a difference. I've followed all the rules, but still no success.

Again, all other plugins including VTM are working (IKM, VUMT, S-Gear etc. etc.).
This is really weird, can't imagine what could be the cause

I am sure something is wrong in my host, but what, ehhhh ...

I'll have cut down my code to minimum and start from the scratch, i guess. Most of the VST code is from SDK's minihost.

Still not sure if QT framework is making any difference.

Thanks for help!
Zabukowski

[eidenk]

Still not sure if QT framework is making any difference.

Perhaps it'll help checking out vstboard which is an host built with Qt framework too.

http://sourceforge.net/projects/vstboard/

[zabukowski]

Still not sure if QT framework is making any difference.

Perhaps it'll help checking out vstboard which is an host built with Qt framework too.

http://sourceforge.net/projects/vstboard/

Thank you, great host as well, very complex

I've checked it, as expected everything works. I'll try to contact author, if he had encountered any problems with QT/VST combo. He uses some kind of MFC/QT migration package.

Thanks!
Zabukowski

[arakula]

Ups, i was not aware that Arakula stands for Herman Seib

After all, it's not relevant to your problem anyway.

Unfortunately, I'm out of additional ideas, since I don't use Qt; but I'd suspect the problem lies there.

[zabukowski]

Ups, i was not aware that Arakula stands for Herman Seib

After all, it's not relevant to your problem anyway.

If I knew who it is Arakula, i would thank you for VSTHost already in the first post

Zabukowski

[zabukowski]

Finally, I've found the cause for this misbehavior:

Moving processReplacing call to the main "audio callback" function of my host solves mentioned problems. Previously it was called from a separate, synchronized thread.

Looks like processing call not being 100% bound to audio interrupt is causing anomalies with GUI of these plugins.

Good to know

Thanks everybody for your help!!!

Zabukowski