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libraries/audio-tools/examples/examples-stream/streams-memory_mp3-metadata/README.md

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+# Decoding a MP3 file with Metadata
+
+In this example we provide the ID3 metadata from a MP3 file. We support the old ID3V1 and the newer ID3V2.
+The MetaDataID3 class is used as stream output destination. 
+You register your callback method with setCallback().

libraries/audio-tools/examples/examples-stream/streams-memory_mp3-metadata/streams-memory_mp3-metadata.ino

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+/**
+ * @file streams-memory_mp3-metadata.ino
+ * @brief In this example we provide the metadata from a MP3 file. 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+#include "sample-12s.h"
+
+
+
+MemoryStream mp3(sample_12s_mp3, sample_12s_mp3_len);
+MetaDataOutput out;
+StreamCopy copier(out, mp3); // copy in to out
+
+// callback for meta data
+void printMetaData(MetaDataType type, const char* str, int len){
+  Serial.print("==> ");
+  Serial.print(toStr(type));
+  Serial.print(": ");
+  Serial.println(str);
+}
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  mp3.begin();
+
+  out.setCallback(printMetaData);
+  out.begin();
+}
+
+void loop(){
+  if (mp3) {
+    copier.copy();
+  } else {
+    stop();
+  }
+}