calculateBinMappings()

void fl::audio::FrequencyBinMapper::calculateBinMappings ( )

private

Calculate FFT bin to frequency bin mappings Pre-calculates which FFT bins contribute to each frequency bin.

Definition at line 75 of file frequency_bin_mapper.cpp.hpp.

                                              {
    const size numBins = static_cast<size>(mConfig.mode);
 
    mBinMappings.clear();
    mBinMappings.reserve(numBins);
 
    // For each output frequency bin, determine which fft::FFT bins contribute
    for (size i = 0; i < numBins; ++i) {
        float minFreq = mBinFrequencies[i];
        float maxFreq = mBinFrequencies[i + 1];
 
        // Convert frequencies to fft::FFT bin indices
        float startBinFloat = frequencyToFFTBin(minFreq);
        float endBinFloat = frequencyToFFTBin(maxFreq);
 
        // Round to integer fft::FFT bin indices
        u32 startBin = static_cast<u32>(startBinFloat);
        u32 endBin = static_cast<u32>(fl::ceilf(endBinFloat));
 
        // Clamp to valid fft::FFT bin range
        if (startBin >= mConfig.fftBinCount) {
            startBin = mConfig.fftBinCount - 1;
        }
        if (endBin > mConfig.fftBinCount) {
            endBin = mConfig.fftBinCount;
        }
 
        // Ensure at least one fft::FFT bin per output bin
        if (endBin <= startBin) {
            endBin = startBin + 1;
        }
 
        BinMapping mapping;
        mapping.startBin = startBin;
        mapping.endBin = endBin;
        mBinMappings.push_back(mapping);
    }
}

References fl::ceilf(), fl::audio::FrequencyBinMapper::BinMapping::endBin, frequencyToFFTBin(), mBinFrequencies, mBinMappings, mConfig, and fl::audio::FrequencyBinMapper::BinMapping::startBin.

Referenced by configure().

Here is the call graph for this function:

Here is the caller graph for this function: