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libraries/audio-tools/examples/examples-communication/a2dp/basic-a2dp-fft/basic-a2dp-fft.ino

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+/**
+ * @file basic-a2dp-fft.ino
+ * @brief A2DP Sink with output to FFT.   
+ * For details see the FFT Wiki: https://github.com/pschatzmann/arduino-audio-tools/wiki/FFT
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioRealFFT.h" // or any other supported inplementation
+#include "BluetoothA2DPSink.h"
+
+BluetoothA2DPSink a2dp_sink;
+AudioRealFFT fft; // or any other supported inplementation
+
+// Provide data to FFT
+void writeDataStream(const uint8_t *data, uint32_t length) {
+  fft.write(data, length);
+}
+
+// display fft result
+void fftResult(AudioFFTBase &fft){
+    float diff;
+    auto result = fft.result();
+    if (result.magnitude>100){
+        Serial.print(result.frequency);
+        Serial.print(" ");
+        Serial.print(result.magnitude);  
+        Serial.print(" => ");
+        Serial.print(result.frequencyAsNote(diff));
+        Serial.print( " diff: ");
+        Serial.println(diff);
+    }
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // Setup FFT
+  auto tcfg = fft.defaultConfig();
+  tcfg.length = 4096;
+  tcfg.channels = 2;
+  tcfg.sample_rate = a2dp_sink.sample_rate();;
+  tcfg.bits_per_sample = 16;
+  tcfg.callback = &fftResult;
+  fft.begin(tcfg);
+
+  // register callback
+  a2dp_sink.set_stream_reader(writeDataStream, false);
+
+  // Start Bluetooth Audio Receiver
+  Serial.print("starting a2dp-fft...");
+  a2dp_sink.set_auto_reconnect(false);
+  a2dp_sink.start("a2dp-fft");
+
+}
+
+void loop() { delay(100); }