template or tutorial for custom c++ scriptnode?

[griffinboy]

@Morphoice Did a small fix there was an error in the template

C++ Node Templates – Google Drive

Google Drive (drive.google.com)

[Morphoice]

@griffinboy said in template or tutorial for custom c++ scriptnode?:

C++ Node Templates – Google Drive

Google Drive (drive.google.com)

thanks so much! I'll use this wisely to make new nodes ;))

[Morphoice]

@griffinboy btw just tried compiling the node on PC but that didnt work at all it's throwing a ton of errors. you wont happen to have any idea what I did wrong?

// ==========================| muLawBitCrusher v1.0 by Morphoice |==========================

#pragma once
#include <JuceHeader.h>
#include <cmath>


namespace project
{
    using namespace juce;
    using namespace hise;
    using namespace scriptnode;

    template <typename T> int sgn(T val) {
        return (T(0) < val) - (val < T(0));
    }

    template <int NV>
    // --- Replace with Name
    struct muLawBitCrusher : public data::base
    {   // ------ Replace with Name
        SNEX_NODE(muLawBitCrusher);

        struct MetadataClass
        { // --------- Replace with "Name"
            SN_NODE_ID("muLawBitCrusher");
        };

        // ==========================| 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; }

        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;

        // ==========================| Global Variables |==========================

        // ==========================| Prepare |==========================
        // Called on init, and when sample rate changes
        void prepare(PrepareSpecs specs)
        {
            float sampleRate = specs.sampleRate;
            float numChannels = specs.numChannels;

            leftChannelEffect.prepare(sampleRate, 5.0); // 5ms smoothing on the gain parameter
            rightChannelEffect.prepare(sampleRate, 5.0);
        }

        // ==========================| Reset |==========================
        // Called when the plugin is reloaded
        void reset() {}

        // ==========================| Process |==========================
        // Blocks of audio enter the script here
        template <typename ProcessDataType>
        void process(ProcessDataType& data)
        {
            // Convert the audio data to a fixed-channel format for efficient processing
            auto& fixData = data.template as<ProcessData<getFixChannelAmount()>>();

            // Get pointers to each channel's audio data
            // Changes to these variables will now directly modify the original audio buffer
            auto audioBlock = fixData.toAudioBlock();
            auto* leftChannelData = audioBlock.getChannelPointer(0);
            auto* rightChannelData = audioBlock.getChannelPointer(1);

            // Get the number of samples (one channel) for this block
            int numSamples = data.getNumSamples();

            // Pass each channel's audio to the appropriate AudioEffect class
            leftChannelEffect.process(leftChannelData, numSamples);
            rightChannelEffect.process(rightChannelData, numSamples);
        }

        // ==========================| AudioEffect Class |==========================
        class AudioEffect
        {
        public:
            AudioEffect(float initialGain = 1.0f)
            {
                smoothGain.set(initialGain); // Initialize sfloat with initial gain
            }

            void prepare(double sampleRate, double timeInMilliseconds)
            {
                smoothGain.prepare(sampleRate, timeInMilliseconds);
            }

            void process(float* samples, int numSamples)
            {
                for (int i = 0; i < numSamples; ++i)
                {
                    float val = samples[i];
                    
                    if (val!=0) {
                        
                        // mu-law compress signal
                        int max = 255;
                        float valmu  = sgn(val) * log( 1.0f + max * abs(val) ) / log( 1.0f + max);
                        
                        // Quantize to 8 bits
                        float valmu8 = valmu - fmodf(valmu, 1.0f / max);
                        
                        // mu-law expand signal
                        float valex = sgn(valmu8) * (1.0f / max) * ( pow(max + 1.0f, abs(valmu8)) - 1.0f );
                        
                        // Apply Demo Gain
                        samples[i] = valex * smoothGain.advance();
                        
                    }
                    /*
                     float rem = fmodf(val,1/max);
                     
                     // Linear quantized to 8 bits
                     float val8 = val - rem;

                     */
                    
                }
            }

            void updateGain(float newGain)
            {
                smoothGain.set(newGain);
            }

        private:
            sfloat smoothGain; // Declare smoothGain variable, using sfloat type for smoothing
        };

        // ==========================| Set Parameter |==========================
        template <int P>
        void setParameter(double v)
        {
            if (P == 0)
                leftChannelEffect.updateGain(static_cast<float>(v)); // Update gain for left channel
            else if (P == 1)
                rightChannelEffect.updateGain(static_cast<float>(v)); // Update gain for right channel
        }

        // ==========================| Create Parameters |==========================
        void createParameters(ParameterDataList& data)
        {

            {   //                             { min, max,  step }                 { id }
                parameter::data p("LeftGain", { 0.1, 2.0, 0.01 }); registerCallback<0>(p);
                p.setDefaultValue(1.0);
                data.add(std::move(p));
            }
            {
                parameter::data p("RightGain", { 0.1, 2.0, 0.01 });
                registerCallback<1>(p);
                p.setDefaultValue(1.0);
                data.add(std::move(p));
            }
        }

        // ==========================| External Data |==========================
        void setExternalData(const ExternalData& data, int index) {}

        // ==========================| Handle HISE Event |==========================
        void handleHiseEvent(HiseEvent& e) {}

        // ==========================| Modulation Slot |==========================
        // ( first enable isModNode() at the top of script )
        /*
            ModValue modValue;
            int handleModulation(double& value)
            {
                return modValue.getChangedValue(value);
            }
            // Creates callback so that altering the 'modValue' var elsewhere will now update the mod slot
            modValue.setModValue(0);
        */

        // processFrame: Needed for compiler, does nothing
        template <typename FrameDataType>
        void processFrame(FrameDataType& data) {}

    private:
        AudioEffect leftChannelEffect;
        AudioEffect rightChannelEffect;
    };
}

what works on mac doesn't on PC

error C3203: 'muLawBitCrusher':
unspecialized class template can't be used as a template argument for template parameter 'T', expected a real type

[griffinboy]

@Morphoice

it compiles on my end.
Did you make sure to name the .h file as follows:

muLawBitCrusher.h

The c++ file always needs to share the same name as the node.
Also by the way, your effect has a heck ton of aliasing.

Edit: *facepalm, aliasing is the point, please ignore me lol

[Morphoice]

@griffinboy ;-))) yes it's named correctly, the VS compiler seems to take offense of my sgn function I got off the webs which is weird as it works fine on mac

template <typename T> int sgn(T val) {
        return (T(0) < val) - (val < T(0));
    }

[griffinboy]

@Morphoice

Yeah it works on my machine... try a fresh hise project.
You could also always try recompiling the latest hise.
If those two things don't fix it, then it's a tricky one

[Morphoice]

@griffinboy i'm getting rid of that template thing for that stupid sign function, which is a syntax beyond my c++ knowledge

this should work too, at least on mac it compiles fine, gotta try on the pc later

                        // mu-law compress signal
                        int max      = 255;
                        int sign     = (0 < val) - (val < 0);
                        float valmu  = sign * log( 1.0f + max * abs(val) ) / log( 1.0f + max);
                        
                        // Quantize to 8 bits
                        float valmu8 = valmu - fmodf(valmu, 1.0f / max);
                        
                        // mu-law expand signal
                        float valex = sign * (1.0f / max) * ( pow(max + 1.0f, abs(valmu8)) - 1.0f );

[Morphoice]

@griffinboy on second thought sign probably only needs to calculate once and should be the same on compressing and expanding a sample so even more calculations can be avoided

[Lindon]

@griffinboy said in template or tutorial for custom c++ scriptnode?:

@Morphoice Did a small fix there was an error in the template

C++ Node Templates – Google Drive

Google Drive (drive.google.com)

Sadly this is pretty unusable - as it blocks chrome from looking at it if adblockers are turned on...

[griffinboy]

@Lindon

Thanks for the heads up

[griffinboy]

@Morphoice

Doesn't even need to be used once. There are approximations or lookup tables that can be used.