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libraries/audio-tools/tests-cmake/codec/mp3-mad/mp3-mad.cpp

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+// Simple wrapper for Arduino sketch to compilable with cpp in cmake
+#include "Arduino.h"
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3MAD.h"
+#include "AudioTools/AudioLibs/PortAudioStream.h"
+#include "BabyElephantWalk60_mp3.h"
+
+MemoryStream mp3(BabyElephantWalk60_mp3, BabyElephantWalk60_mp3_len);
+PortAudioStream portaudio_stream;   // Output of sound on desktop 
+EncodedAudioStream dec(&portaudio_stream, new MP3DecoderMAD()); // MP3 data source
+StreamCopy copier(dec, mp3); // copy in to out
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  dec.addNotifyAudioChange(portaudio_stream);
+  dec.begin();
+
+  portaudio_stream.begin();
+}
+
+void loop(){
+  if (mp3) {
+    copier.copy();
+  } else {
+    auto info = dec.decoder().audioInfo();
+    LOGI("The audio rate from the mp3 file is %d", info.sample_rate);
+    LOGI("The channels from the mp3 file is %d", info.channels);
+    exit(0);
+  }
+}
+