How to use juce::LinearInterpolator?

1

Hi,

I can’t find any examples. When I use speedRatio = 1.0, everything seems to be fine. But if I want to use different speeds then I hear just crackles and my sine looks like 512 samples is sine and the rest is just zero values.

I asked chatgpt and after two hours we come with it. But it still not working as expected:

// prepareSample:
float inputSample[2048]{}; // sine
float output[bufferSize]; // size equals to the buffer size. Basically 512 or 1024.
 juce::LinearInterpolator interpolator;
...
// render next block:
double speedRatio = 2.0;
auto sampleSize = 2048;
auto increment = interpolator.process(speedRatio, inputSample, outputSamples, bufferSize, sampleSize, 1);

  position += increment; // increment for some reason always 0 why?!?!

  if (position >= sampleSize) {
      position -= sampleSize;
      interpolator.reset();
  }
2

It looks like I misunderstood int wrapAround parameter. I used 1. Now I tried to use 2048 and it seems like generate now full sample. Here is on screenshot I used test 16.2343 speedRatio.

But why breaks? how to make the signal continuous by filling the output buffer? Any example?

Thank you!

image
image2526×666 129 KB

3

wrapAround is the size of your input. Here indeed 2048

never call reset

4

@otristan thx. I forgot to put updated code. Yes I removed reset() but result you can see on screenshot above. In fact, it never entered this line, because the size was always returned less than sampleSize, it was 2047 max