36 lines
893 B
C++
36 lines
893 B
C++
//
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// Created by versustune on 12.06.20.
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//
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#include "FFT.h"
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void FFT::pushNextSampleIntoFifo(float sample) noexcept {
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{
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if (fifoIndex == fftSize) // [11]
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{
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if (!nextFFTBlockReady) // [12]
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{
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zeromem(fftData, sizeof(fftData));
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memcpy(fftData, fifo, sizeof(fifo));
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nextFFTBlockReady = true;
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}
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fifoIndex = 0;
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}
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fifo[fifoIndex++] = sample; // [12]
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}
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}
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void FFT::drawNextFrameOfSpectrum() {
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window.multiplyWithWindowingTable(fftData, fftSize); // [1]
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fft.performFrequencyOnlyForwardTransform(fftData); // [2]
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auto mindB = -80.0f;
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auto maxdB = 0.0f;
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for (int i = 0; i < scopeSize; ++i)
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{
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auto level = jmap(Decibels::gainToDecibels(fftData[i], mindB), mindB, maxdB, -1.0f, 1.0f);
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scopeData[i] = level;
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}
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}
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