C++ Buffers, and using the Hise interpolator?

[griffinboy]

Probably a question for @Christoph-Hart

I'm having a lot of issues trying to use the hise interpolator in C++ with my own custom buffer.
The juce and C++ buffers don't seem to be compatible with the interpolator. What is the ideal array type I should use if I want to interface with the snex interpolators?

using InterpolatorType = index::hermite<index::unscaled<double, index::clamped<0, false>>>;

I am currently using this to resample the external data buffer, for which I have a span:

span<dyn<float>, 2> sample;              // Stereo sample data.

void setExternalData(const ExternalData& ed, int index)
        {
            // Reference the external sample data to the internal sample buffers.
            sampleData = ed;
            ed.referBlockTo(sample[0], 0);
            ed.referBlockTo(sample[1], 1);
        }

And that works fine

// Perform interpolation.
                    InterpolatorType idx(voice.position);
                    float sampleValue = (sample[0][idx] + sample[1][idx]) * 0.5f * voice.velocity;

                    // Accumulate sample contributions.
                    sampleSumLeft += sampleValue;
                    sampleSumRight += sampleValue;

                    // Advance the voice position by delta.
                    voice.position += voice.delta;

But I'm having a great amount of trouble doing the same thing for a custom buffer.

I've been attempting to use heap and then make a span that references it, and I've also tried to create a span referencing a regular vector array, and a dyn span that refrences a span. But it's not been turning out well! don't really understand the procedure for declaring and using these properly.

This is all part of my sampler, which I've been having a horrible time trying to put together.

[griffinboy]

@griffinboy @Christoph-Hart

Could you perhaps demonstrate how to end up at a dyn span from nothing?
Do we start out as a different type of array and then create a span from that?
If we want the size of the buffer to be dynamic is that possible?

Or last of all, should I just make my own interpolator and forget about all this...

[Christoph Hart]

@griffinboy the SNEX API has three main container types and if you want to use the index template for interpolating / safe access you need to use them. They differ in their ability to change their size dynamically and whether or not they "own" the data:

• span: owns the data, compile time size (allocated on creation)
• dyn: doesn't own the data, only refers to it
• heap: owns the data, but allocates it dynamically

The easiest entry into this would be creating a dyn<T> container with a simple T* pointer and a size. Almost any container in the world will give you access to the raw data. Here's a std::vector<float> example:

std::vector<float> x;
x.push_back(1.0f);
x.push_back(1.0f);
x.push_back(1.0f);

dyn<float> snexContainer(x.data(), x.size());

[griffinboy]

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[griffinboy]

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