decimateBy2()

static void fl::audio::fft::Context::decimateBy2 ( kiss_fft_scalar * buf, int len )

inlinestaticprivate

Definition at line 1061 of file fft_impl.cpp.hpp.

                                                           {
        int outLen = len / 2;
        for (int i = 0; i < outLen; i++) {
            int idx = i * 2;
            auto s = [&](int offset) -> i32 {
                int j = idx + offset;
                if (j < 0) j = 0;
                if (j >= len) j = len - 1;
                return buf[j];
            };
            i32 val = -s(-3) + 9*s(-1) + 16*s(0) + 9*s(1) - s(3);
            buf[i] = static_cast<kiss_fft_scalar>(val / 32);
        }
    }

References kiss_fft_scalar, and offset().

Referenced by runHybrid(), and runOctaveWise().

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