Monitor changes inside Scriptfx - the correct method? (broadcasters listeners)

[Christoph Hart]

@griffinboy I looked into yesterday because it worked for me but then I realized that we're talking about different things. I was checking the Hardcoded FX and you are probably loading the node in a network (because there it doesn't work yet).

I tried to fix it but there is one nasty persistent crash when unloading the nodes that connect to a cable that I still have to fix. In the meantime you can check the procedure with the hardcoded FX module, there it should work.

[Christoph Hart]

Alright, please check it again, now it should work.

[griffinboy]

@Christoph-Hart

I'll check it! Thanks for the update.

[griffinboy]

@Christoph-Hart

It works! Thank you!
I'll do a video on this soon in my scriptnode c++ series. I've been remaking the first few videos to make more sense and go into better depth.

[ustk]

@griffinboy @Christoph-Hart What is the way to send the value to the node from the UI?
Is there a callback that should be defined?

[griffinboy]

@ustk

Global cables can be used.

// Griffin_Node.h
// -----------------------------------------------------------------------------

#pragma once
#include <JuceHeader.h>

//#include "src/.h"
//#include "src/.h"
//#include "src/.h"
//#include "src/.h"

//#include "src/Utils_DelayInterpolation.h"
//#include "src/Utils_General.h"
//#include "src/Utils_XSimd.h"

namespace project
{

    #ifndef M_PI
    #define M_PI 3.14159265358979323846
    #endif

    using namespace juce;
    using namespace hise;
    using namespace scriptnode;


    /*
        Griffin_Node
        -----------
        Description of entire program + specs
    */


    /*

    // Global Cable Example (communicate arbitrary data to Hise)
    enum class GlobalCables
    {
        dataCable = 0
    };
    using cable_manager_t = routing::global_cable_cpp_manager<SN_GLOBAL_CABLE(-389806413)>;

    // Template the node with this
    template <int NV> struct Griffin_Node: public data::base,
                                    public cable_manager_t
{

    // In c++ we can then:    
    // create a json object
    hise::JSONObject obj;
    // write values into the JSON object
    obj["thingies"] = [0,1,2,3,4];
    // send the object back to HISE
    this->sendDataToGlobalCable<GlobalCables::dataCable>(obj);
    // thus we can send any type of data to Hise

    // then in Hise we can do:
    const var rm = Engine.getGlobalRoutingManager();
    const var cableName = rm.getCable("cableName");
    cableName.registerDataCallback(function(data)
    {
        Console.print("DATA: " + trace(data));
    });
    

    */


    // pre C++20
    // You cannot change the way this node is templated
    template <int NV>
    // name
    struct Griffin_Node : public data::base
    {          // name
        SNEX_NODE(Griffin_Node);

        struct MetadataClass
        {              // name
            SN_NODE_ID("Griffin_Node");
        };

        // name
        Griffin_Node()
        {
            // Callback for global cables
            // (from HISE to your C++ node, this is the way to register callbacks).
            //this->registerDataCallback<GlobalCables::dataCable>([](const var& funky)
            //{
            //    jassertfalse;
            //});
        }


        //==============================================================================
        // Node Properties 
        //==============================================================================

        static constexpr bool isModNode() { return false; }
        static constexpr bool isPolyphonic() { return NV > 1; }
        static constexpr bool hasTail() { return false; }
        static constexpr bool isSuspendedOnSilence() { return false; }
        static constexpr int getFixChannelAmount() { return 2; }

        // Add external data slots to the node UI
        static constexpr int NumTables = 0;
        static constexpr int NumSliderPacks = 0;
        static constexpr int NumAudioFiles = 0;
        static constexpr int NumFilters = 0;
        static constexpr int NumDisplayBuffers = 0;


        /*
            AudioEffect
            -----------
            Description
        */

        class AudioEffect
        {
        public:
            AudioEffect(float initiaParam = 5000.0f)
            {
                localParam = initiaParam;
            }

            // Initialize the effect if needed
            void prepare(double sampleRate)
            {

            }

            // Process a block of samples
            inline void process(float* samples, int numSamples)
            {
                // Iterate over the samples
                for (int i = 0; i < numSamples; ++i)
                {

                }
            }

            // Update the parameters
            inline void updateParam1(float newParam)
            {
                localParam = newParam;
            }

        private:
            float localParam;
        };


        /*
            Main Node
            -----------
            Description
        */

        // Initialize the effect
        void prepare(PrepareSpecs specs)
        {
            float sampleRate = specs.sampleRate;
            float numChannels = specs.numChannels;

            // Initialize both effects (does nothing by default)
            leftChannelEffect.prepare(sampleRate);
            rightChannelEffect.prepare(sampleRate);
        }

        // Reset (called when the plugin is reloaded)
        void reset() {}

        // Process audio blocks (audio enters the node here)
        template <typename PD>
        inline void process(PD& d)
        {
            auto& fix = d.template as<ProcessData<2>>();
            auto  blk = fix.toAudioBlock();
            float* L = blk.getChannelPointer(0);
            float* R = blk.getChannelPointer(1);
            int    n = d.getNumSamples();

            // Process each channel separately through their own audioEffect instance
            leftChannelEffect.process(L, n);
            rightChannelEffect.process(R, n);
        }

        /*
            Parameter Handling
            -----------
            Description
        */

        // Update parameters
        template <int P>
        inline void setParameter(double v)
        {
            if (P == 0) {
                leftChannelEffect.updateParam1(static_cast<float>(v));
                rightChannelEffect.updateParam1(static_cast<float>(v));
            }
            if (P == 1) {
                // Do something with value (v)
            }

        }

        // Create GUI parameters
        void createParameters(ParameterDataList& data)
        {
            {
                parameter::data p("Param", { 0.0, 1.0, 0.01 });
                registerCallback<0>(p);
                p.setDefaultValue(5000.0);
                data.add(std::move(p));
            }
            {
                parameter::data p("Param2", { 0.0, 1.0, 0.01 });
                registerCallback<0>(p);
                p.setDefaultValue(5000.0);
                data.add(std::move(p));
            }

        }

        // When this header file gets run for the first time, setParameter gets called with the default knob values


        /*
            External Data
            -----------
            Description
        */

        // span<dyn<float>, NUM_CHANNELS> externalBuffer;

        void setExternalData(const ExternalData& ed, int index)
        {
            /*

            if(data.isNotEmpty())
            {
    
                // ExternalData data = ed;
    
                // float audioSampleRate = data.sampleRate;
                // float audioNumChannels = data.numChannels;
                // float audioNumSamples = data.numSamples;
    
                // ed.referBlockTo(externalBuffer[0], 0);
                // ed.referBlockTo(externalBuffer[1], 1);

                // Alternatively convert the data to the juce::AudioSampleBuffer class
                // auto buffer = data.toAudioSampleBuffer();
    
            }

            */
        }

        /*
            Hise Event
            -----------
            Description
        */

        void handleHiseEvent(HiseEvent& e)
        {
            /*

            if (e.isNoteOn())
            {
                float note = e.getNoteNumber();
            }

            */
        }


        /*
            Modulation Output
            -----------
            To enable, set isModNode() to true)
        */

        // ModValue modOut;

       // bool handleModulation(double& value)
       // {
           // return modOut.getChangedValue(value);
       // }

        // Use this to call handleModulation
        // modOut.setModValueIfChanged( set mod to something );

        //==============================================================================
        // Unused Functions (Required by compiler)
        //==============================================================================

        SN_EMPTY_PROCESS_FRAME;

      	//SN_EMPTY_HANDLE_EVENT;
      	//SN_EMPTY_SET_EXTERNAL_DATA;
        //SN_EMPTY_CREATE_PARAM;

    private:
        AudioEffect leftChannelEffect;
        AudioEffect rightChannelEffect;
    };
}

[ustk]

@griffinboy Yeah cable is what I am trying to use, I need to receive JSON data from UI.

Thanks for your template code it's awesome! Well... when I'll be able to make it work lol

[griffinboy]

@ustk

Christoph wrote an example for exactly that somewhere... I wonder where it was I'm not sure, search for global cable posts!

That template above has a version of it. Use GPT to untangle my comments itll understand mostly what I was writing there

[ustk]

@griffinboy I tried many keywords already with no luck...

[ustk]

@griffinboy Cool I got it to compile with the callback!
Now it's a matter of properly reading the JSON I am sending... -> Working

UI code:

const var RoutingManager = Engine.getGlobalRoutingManager();
const var DataCable = RoutingManager.getCable("dataCable");

const var data = {level: 0.0};


inline function onKnob1Control(component, value)
{
	data.level = value;
	
	DataCable.sendData(data);
};

C++

    global_cable_data()
    {
        // Register a data callback for the global cable
        this->registerDataCallback<GlobalCables::dataCable>([this](const var& data)
        {
            if (auto* obj = data.getDynamicObject())
            {
                const var& levelVar = obj->getProperty("level");

                //if (levelVar.isDouble() || levelVar.isInt())
                //{
                    gain = static_cast<float>(static_cast<double>(levelVar));
                //}
            }
        });
    }

This doesn't seem to update gain

EDIT: my bad... wasn't listening on the right set of speakers lol WORKING LKE A CHARM!!!
Thanks a lot @griffinboy !

[griffinboy]

@ustk

Nice thanks for posting the working answer

[Christoph Hart]

@ustk said in Monitor changes inside Scriptfx - the correct method? (broadcasters listeners):

@griffinboy I tried many keywords already with no luck...

In the docs:

HISE | ScriptNode | global_cable

Send a double precision float value anywhere to HISE

(docs.hise.dev)

What is the way to send the value to the node from the UI?
Is there a callback that should be defined?

For UI -> Node communication, just use the stock parameter system. Only for Node -> UI communication (eg. reporting back analysis values from your C++ class) you need to use the global cables - and then you can choose between a realtimesafe single value or any arbitrary data that will be allocated and copied around over the DLL boundaries (which is not realtime safe).

[ustk]

@Christoph-Hart hmmm... have to look at this ! I made it to work UI -> global cable -> node, but I'll try with standard parameter to send an array of JSON

[griffinboy]

@ustk

GCs are the only way to send an array into a node, unless you encode it as audio or other.

[ustk]

@griffinboy oh that's what I was thinking, @Christoph-Hart's shortcut needed a sequel

[Christoph Hart]

@ustk ah ok, I was just underwhelmed by the data you send over the cable in your example (a single gain number lol) but I have no idea what you're doing in the real world.

If you need to send more to your node, then yeah the global cable might be the best option.

[ustk]

@Christoph-Hart said in Monitor changes inside Scriptfx - the correct method? (broadcasters listeners):

@ustk ah ok, I was just underwhelmed by the data you send over the cable in your example (a single gain number lol)

Yeah you make me feel padawan like, which I probably am lol.

but I have no idea what you're doing in the real world.

I'm wondering the same thing every single day, until I'm uploaded to the cloud...

More seriously, I draw a spline in the interface, and send the control points to the node in order to reconstruct the wave shaper in a buffer...
Sounds the right approach or did I spend a week luring myself?

[Christoph Hart]

@ustk the table UI component is exactly that - a path with (quadratic) curves that are rendered to a float buffer and can be send to a C++ class over the ExternalData API. If for some reason the Table doesn't fit your requirements then yes your approach would be the next best thing.

[ustk]

@Christoph-Hart I am making a cubic B-spline so a quadratic is somewhat underwhelming lol

But that would be so much easier

[ustk]

@Christoph-Hart Do you think making the table to be working with any kind of custom spline (using a custom object) can be a serious request?
Since there are many type of spline behaviour out there...