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libraries/audio-tools/examples/examples-player/player-sdfat-ffti2s/player-sdfat-ffti2s.ino

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+/**
+ * @file player-sdfat-ffti2s.ino
+ * @brief Audio Player with output to I2S and FFT
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+
+#include "AudioTools.h"
+#include "AudioTools/Disk/AudioSourceSD.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+#include "AudioTools/AudioLibs/AudioRealFFT.h" // or AudioKissFFT or others
+
+const char *startFilePath="/";
+const char* ext="mp3";
+AudioSourceSD source(startFilePath, ext);
+MultiOutput multi_output;
+MP3DecoderHelix decoder;
+AudioPlayer player(source, multi_output, decoder);
+I2SStream i2s; // output to i2s
+AudioRealFFT fft; // or AudioKissFFT or others
+
+// 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 I2S
+  auto cfg = i2s.defaultConfig(TX_MODE);
+  i2s.begin(cfg);
+
+  // Setup FFT
+  auto tcfg = fft.defaultConfig();
+  tcfg.copyFrom(cfg);
+  tcfg.length = 1024;
+  tcfg.callback = &fftResult;
+  fft.begin(tcfg);
+ 
+  // Setup Multioutput
+  multi_output.add(fft);
+  multi_output.add(i2s);
+
+  // setup player
+  //source.setFileFilter("*Bob Dylan*");
+  player.begin();
+}
+
+void loop() {
+  player.copy();
+}