buildLogBinLut()

void fl::audio::fft::Context::buildLogBinLut ( fl::vector< u8 > & lut, int fftN, float fs, int binStart, int binEnd )

inlineprivate

Definition at line 439 of file fft_impl.cpp.hpp.

                                                               {
        const int numRawBins = fftN / 2 + 1;
        lut.resize(numRawBins);
        const u16x16 rawBinHz(fs / static_cast<float>(fftN));
 
        for (int k = 0; k < numRawBins; ++k) {
            u16x16 freq = rawBinHz * static_cast<u32>(k);
 
            int lo = binStart, hi = binEnd - 1;
            while (lo < hi) {
                int mid = (lo + hi + 1) / 2;
                if (mLogBinEdgesQ16[mid] <= freq)
                    lo = mid;
                else
                    hi = mid - 1;
            }
            lut[k] = static_cast<u8>(lo);
        }
    }

References fl::FL_NO_EXCEPT, and mLogBinEdgesQ16.

Referenced by initHybrid(), and initLogRebin().

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