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libraries/audio-tools/tests-cmake/ifft/ifft.cpp

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+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioRealFFT.h" // using RealFFT
+#include "AudioTools/AudioLibs/MiniAudioStream.h"
+
+AudioInfo info(44100, 2, 16);
+AudioRealFFT afft; // or AudioKissFFT
+//CsvOutput<int16_t> out(Serial);
+MiniAudioStream out;
+StreamCopy copier(out, afft);
+int bin_idx = 0;
+
+// privide fft data
+void fftFillData(AudioFFTBase &fft) {
+  fft.clearBins();
+  FFTBin bin{1.0f,1.0f};
+  assert(fft.setBin(bin_idx, bin));
+
+  // restart from first bin
+  if (++bin_idx>=fft.size()) bin_idx = 0;
+}
+
+void setup() {
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // Setup FFT
+  auto tcfg = afft.defaultConfig(RX_MODE);
+  tcfg.copyFrom(info);
+  tcfg.length = 1024;
+  tcfg.callback = fftFillData;
+  afft.begin(tcfg);
+
+  // setup output
+  auto ocfg = out.defaultConfig(TX_MODE);
+  ocfg.copyFrom(info);
+  out.begin(ocfg);
+}
+
+void loop() { copier.copy(); }