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...

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

HISE | ScriptNode | global_cable

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