Measuring plugin delay times....

[HISEnberg]

@Lindon @griffinboy 's method is essentially how I do it too (measure them beforehand while working on the core DSP). But to do it from within HISE is not so hard either:

You can leverage Engine.get/setLatencySamples to do this.

I discussed it here, and I believe someone developed an automated process for it on the forum elsewhere (I can't find the link, or perhaps I am going mad)....

I'm not terribly confident the HISE CLI/MCP could handle this, but you could direct an agent to load each network, one at a time, into a HardcodedMasterFx. Each time get it to recompile with:

Console.print(Engine.getLatencySamples);

Collect all those values, then anytime that network is loaded in, use Engine.setlatencySamples to update the host. In my experience these two functions will work both when the plugin is loaded, and during real-time processing (presumably at blockrate).

Likewise you could turn an Agent onto the source code and read the DSP pieces (as griffinboy suggested), but in a complex network, done for all 133 FX, I picture that leading to more errors long-term.

*Note: I've never tested this method thoroughly enough. Possibly some hosts are not going to support dynamic changes to the latency reported *

[ustk]

@Lindon My process is to automate this from Hise itself.

You can write a test script that:

• loads the FXs one by one
• play a test signal
• record that test signal before and after the FX in 2 scriptFX module process callbacks (or 1 unique recorder with 2 passes, bypassed/unbypassed)
• perform a cross correlation between the two buffers to get the sample diff
• and populate an array that will hold the latencies per FX

Claude can easily create this for you if you need

And as @griffinboy said group delay can be tricky and give weird results, especially with impulses. I'd do it with white noise since cross-correlation is very effective with it (I do this in my Align-IT app)

[dannytaurus]

@HISEnberg said in Measuring plugin delay times....:

Console.print(Engine.getLatencySamples);

Unfortunately, all that does is show you the value you already set with setLatencySamples(), it doesn't get the actual latency of the current configuration.

[dannytaurus]

@Lindon @HISEnberg said in Measuring plugin delay times....:

Possibly some hosts are not going to support dynamic changes to the latency reported

This might end up being the biggest issue of all. Even if you accurately record all those permutations and combinations of latency, if the hosts don't play ball with dynamic changes to latency values you're SOL.

EDIT: nonsense, as oust points out below

[ustk]

@dannytaurus said in Measuring plugin delay times....:

This might end up being the biggest issue of all

Not really because this would be poor design to report dynamic latency anyway.
The way (one way?) to do it is to report for the maximum latency, and add a delay in the chain based on the difference between the maximum and the currently loaded FXs. This is the purpose of having a latency array per FX.
So the host sees a permanent latency, and it's the plugin job to compensate for exceeding reported latency.

[dannytaurus]

@ustk Oh yeah, of course. We already discussed all that previously in other topics. I must be delirious!

[Lindon]

@ustk said in Measuring plugin delay times....:

@Lindon My process is to automate this from Hise itself.

You can write a test script that:

• loads the FXs one by one
• play a test signal
• record that test signal before and after the FX in 2 scriptFX module process callbacks (or 1 unique recorder with 2 passes, bypassed/unbypassed)
• perform a cross correlation between the two buffers to get the sample diff
• and populate an array that will hold the latencies per FX

Claude can easily create this for you if you need

And as @griffinboy said group delay can be tricky and give weird results, especially with impulses. I'd do it with white noise since cross-correlation is very effective with it (I do this in my Align-IT app)

do you have an example(snippet) of this cause I dont(yet) use Claude and its all new to me.

[ustk]

@Lindon I'll try to find and recycle something...

[ustk]

@Lindon this one uses an impulse. See if you can make it work with your project, then you might need to use a noise and a correlation algorithm later instead of simple subtraction of the peak index

Note that it takes the number of channels of the routing matrix.
the current snippet gives you a report of ch0-1 delay L-R, and ch2-3 scriptFX, which is L=silent and R=untouched. A silence gives a negative latency that easily speaks for "there's nothing to report"

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[Lindon]

@ustk thanks mate I will give it a go...I have no idea how to do a "correlation algorithm" but its all an adventure...