Function MakeInterpolatedKernel

src/internal/src/HRTFPanner.cpp:519–540

Interpolates two kernels with x: 0 -> 1 and returns the result.

// Interpolates two kernels with x: 0 -> 1 and returns the result.
std::unique_ptr<HRTFKernel> MakeInterpolatedKernel(HRTFKernel * kernel1, HRTFKernel * kernel2, float x)
{
    ASSERT(kernel1 && kernel2);
    if (!kernel1 || !kernel2)
        return 0;

    ASSERT(x >= 0.0 && x < 1.0);
    x = std::min(1.0f, std::max(0.0f, x));

    float sampleRate1 = kernel1->sampleRate();
    float sampleRate2 = kernel2->sampleRate();

    ASSERT(sampleRate1 == sampleRate2);
    if (sampleRate1 != sampleRate2)
        return 0;

    float frameDelay = (1 - x) * kernel1->frameDelay() + x * kernel2->frameDelay();
    //kernel1->fftFrame()->print();

    std::unique_ptr<FFTFrame> interpolatedFrame = FFTFrame::createInterpolatedFrame(*kernel1->fftFrame(), *kernel2->fftFrame(), x);
    return std::unique_ptr<HRTFKernel>(new HRTFKernel(std::move(interpolatedFrame), frameDelay, sampleRate1));
}


// @fixme - will change for new HRTF databases