How to get event ids for artificial events?

benosterhouse

Basically, I'm seeing if I can port a library to vst using hise.
It has string swells in it, which are tempo synced. I see that hise doesn't really have timestretching yet, but I was realizing there's another way around it:
If you play the beginning of the swell, then crossfade into the middle of the swell, you can adjust the length of the swell, so it'd fit into any project tempo (the phasing isn't too bad. I have some ideas to get around that).

If you're fading together different parts of the swell, the tail end of it needs to be started with an artificial event.
If you have multiple stiched-together swells (which use artificial events), and they're happening on the same key at the same time, you need a way to note-off all the artificial events when you lift the pedal.

d.healey

@benosterhouse I get it, I'll play around with it a little tomorrow and see if I can come up with a way of managing the sustain/note off thing manually.

benosterhouse

Ok cool!
On a sampled piano, if you play a repeated note with the pedal down you want to keep the previous sample going.

benosterhouse

Ok, that way I was trying to iterate through things before was too complicated and didn't actually work.

I just added another dimension to the array so I could record more than one event id per key!
Waaay simpler.

d.healey

How many events do you want to record per key? I'm still thinking that with acoustic instruments in general each repeated note will kill old notes, causing them to decay.

Christoph Hart

That's not completely true. For example if you press down the sustain pedal, play a loud note on the piano, then play a soft note on the same key shortly after it, you would hear that the new note is fading down the old note which sounds really bad.

That's why in the sampler options you have the "Kill second note" retrigger behaviour which allows you to have at least two notes of the same key ringing at once. This weakens that effect a little bit, but it's still noticeable.

d.healey

@Christoph-Hart Very good point!

benosterhouse

This should record as many event ids per key as needed --I didn't set a max number.

Here's what I got!

function onNoteOn()
{     
    Message.ignoreEvent(true);
    
    note = Message.getNoteNumber();
    if (keyDown.getValue(note) == 1)
        keyVoiceCount[note]++;
        
    g_group_allows[G_START] = 1;
    eventIds[note][keyVoiceCount[note]] = Synth.playNote(note, 64);
    eventTimeStamp[note][keyVoiceCount[note]] = Engine.getUptime();
    keyDown.setValue(note, 1);
}

function onNoteOff()
{   
    if (pedal == 0) 
    {
        keyDown.setValue(Message.getNoteNumber(), 0);
        note = Message.getNoteNumber();
        for (v = 0; v <= keyVoiceCount[note]; v++)
        {
            Synth.noteOffByEventId(eventIds[note][v]);
            if (delayedEventIds[note][v])
            {
                Synth.noteOffByEventId(delayedEventIds[note][v]);
                delayedEventIds[note][v] = 0;
            };
            eventTimeStamp[note][v] = 0;
        };
        keyVoiceCount[note] = 0;
    };
}
 
function onTimer()
{
    for (n = 0; n < 128; n++)
    {
        for (v = 0; v <= keyVoiceCount[n]; v++)
        {
            if (eventTimeStamp[n][v]) 
            {
                playPos = (Engine.getUptime() - eventTimeStamp[n][v]) * 1000;
                playPos = Engine.getQuarterBeatsForMilliSeconds(playPos);
                if (playPos > 4 && !delayedEventIds[n][v])
                {
                    g_group_allows[G_START] = 1;
                    delayedEventIds[n][v] = Synth.playNote(n, 64);
                };
            };
        };  
    };
}
 
function onController()
{
    if (Message.getControllerNumber() == 64) 
    {
        if (Message.getControllerValue() > 5) 
        {
            pedal = 1;
            //Console.print("pedal down");
        } else {
            pedal = 0;
            for (n = 0; n < 128; n++)
            {
                if (Synth.isKeyDown(n) == 0 && keyDown.getValue(n) == 1)
                {
                    keyDown.setValue(n, 0);
                    for (v = 0; v <= keyVoiceCount[n]; v++)
                    {   
                        Synth.noteOffByEventId(eventIds[n][v]);
                        eventIds[n][v] = 0;
                        Synth.noteOffByEventId(delayedEventIds[n][v]);
                        delayedEventIds[n][v] = 0;
                        eventTimeStamp[n][v] = 0;
                    };
                    keyVoiceCount[n] = 0;
                };
            };
        };
    };
}

So basically now you can have multiple parallel sequences of artificial events on the same key, which are note off'd correctly by the pedal.

Before, I did this by using Synth.addNote() to schedule the sequence of artificial events, but I was running into some problems there.

This is with Retrigger set to "Do nothing"

Man, this was a lot of work! Maybe I should have just done the "Kill Duplicate" option and just NOT allowed overlapping swells on the same key haha :face_with_tongue:

d.healey

@benosterhouse

Maybe I should have just done the "Kill Duplicate" option and just NOT allowed overlapping swells on the same key haha

Looks like you're having fun though :)

benosterhouse

Yep, I'm learning a lot :)

Christoph Hart

Yep, I'm learning a lot

Make sure you use the reserve function for all those arrays to avoid allocating items in the MIDI callbacks:

HISE | Scripting | Array

An Array is a object that can hold multiple other objects and can be indexed using a sequential number.

(docs.hise.audio)

d.healey

@Christoph-Hart Would an array of MIDI lists be more efficient?

benosterhouse

For a multi-dimensional array, would reserve make sense used this way?

delayedEventIds.reserve(128); // note slots
delayedEventIds[n].reserve(16); // reserve 16 voices per note slot
delayedEventIds[n][v] = Synth.playNote(n, 64);

Christoph Hart

Yes. You might need to initialise the element at delayedEventIds[n]
as array before calling reserve, but then it should work.

@d-healey the efficiency of the MIDI list gets interesting as soon as it helps you avoid writing for loops, so

searching for an item
clearing all items

It will speed up things a bit.

The nested for loop in this example will most likely be the bottleneck, so I would start optimizing there on a higher level though...

benosterhouse

Cool, yep it gets initialized in the onInit

How to get event ids for artificial events?

HISE | Scripting | Array

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