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libraries/audio-tools/tests-cmake/fft/fft.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
+Hann hann;
+BufferedWindow buffered(&hann);
+SineWaveGenerator<int16_t> sineWave(32000);
+GeneratedSoundStream<int16_t> in(sineWave);
+StreamCopy copier(afft, in);
+//CsvOutput<int16_t> out(Serial);
+MiniAudioStream out;
+StreamCopy copierIFFT(out, afft);
+
+// process fft result
+void fftResult(AudioFFTBase &fft) {
+  // copy ifft result to output
+  while (copierIFFT.copy());
+}
+
+void setup() {
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // set the frequency
+  sineWave.setFrequency(N_B4);
+
+  // Setup sine wave
+  auto cfg = in.defaultConfig();
+  cfg.copyFrom(info);
+  in.begin(cfg);
+
+  // Setup FFT
+  auto tcfg = afft.defaultConfig(RXTX_MODE);
+  tcfg.copyFrom(info);
+  tcfg.length = 1024;
+  tcfg.window_function = &buffered;
+  tcfg.stride = 512;
+  tcfg.callback = fftResult;
+  afft.begin(tcfg);
+
+  // setup output
+  auto ocfg = out.defaultConfig(TX_MODE);
+  ocfg.copyFrom(info);
+  out.begin(ocfg);
+}
+
+void loop() { copier.copy(); }