JUCE Assertion failure in juce_DelayLine.cpp:60

Audio Plugins
1

Hello, when attempting to run a delay plugin that relies on JUCE’s delay line class, I receive the following error message: JUCE Assertion failure in juce_DelayLine.cpp:60

For reference, here are some relevant lines of juce_DelayLine.cpp:

void DelayLine<SampleType, InterpolationType>::setDelay (SampleType newDelayInSamples)
{
    auto upperLimit = (SampleType) getMaximumDelayInSamples();
    jassert (isPositiveAndNotGreaterThan (newDelayInSamples, upperLimit)); // Line 60

    delay     = jlimit ((SampleType) 0, upperLimit, newDelayInSamples);
    delayInt  = static_cast<int> (std::floor (delay));
    delayFrac = delay - (SampleType) delayInt;

    updateInternalVariables();
}

In my code, delay is an AudioParameterFloat that ranges from 0.001f to 1.0f, and prepareToPlay is as follows:

void prepareToPlay (double sampleRate, int samplesPerBlock) override
    {
        juce::dsp::ProcessSpec spec;
        spec.maximumBlockSize = samplesPerBlock;
        spec.sampleRate = sampleRate;
        spec.numChannels = getTotalNumOutputChannels();
        delayLine.prepare (spec);
        
        // Delay in seconds is converted to delay in samples
        delayLine.setDelay (delay->get() * sampleRate);
        
        // Since the delay parameter is limited to a maximum of 1s, the maximum possible delay in samples is sampleRate in samples/s * 1s
        delayLine.setMaximumDelayInSamples (sampleRate);
    }

I also tried hard coding int, double, and float values for both setDelay and setMaximumDelayInSamples that ensure newDelayInSamples is positive and not greater than upperLimit in reference to juce_DelayLine.cpp line 60 but got the same JUCE assertion failure each time.

2

You should call delayLine.setMaximumDelayInSamples (sampleRate) BEFORE delayLine.setDelay (delay->get() * sampleRate);.

1 Like
3

Thank you for your help!