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libraries/audio-tools/tests-cmake/codec/m4a-extractor/m4a-extrator.ino

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+/**
+ * @file m4a-extractor.ino
+ * @author Phil Schatzmann
+ * @brief Decode M4A file and output to CSV
+ * @version 0.1
+ *
+ * @copyright Copyright (c) 2025
+ *
+ */
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/M4AAudioFileDemuxer.h"
+#include "AudioTools/AudioCodecs/CodecALAC.h"
+#include "AudioTools/AudioCodecs/CodecAACHelix.h"
+#include "AudioTools/AudioCodecs/MultiDecoder.h"
+#include "SD.h"
+
+MultiDecoder multi_decoder;
+AACDecoderHelix dec_aac;
+DecoderALAC dec_alac;
+CsvOutput<int16_t> out(Serial);
+
+//MP4Parser parser;
+M4AAudioFileDemuxer demux;
+File file;
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  if (!SD.begin()) {
+    Serial.println("SD Card initialization failed!");
+    return;
+  }
+
+  file = SD.open("/home/pschatzmann/Music/m4a/1-07 All You Need Is Love.m4a");
+  if (!file) {
+    Serial.println("Failed to open file!");
+    return;
+  }
+
+  // Setup decoder
+  multi_decoder.setOutput(out);
+  multi_decoder.addDecoder(dec_aac, "audio/aac");
+  multi_decoder.addDecoder(dec_alac, "audio/alac"); 
+  demux.setDecoder(multi_decoder);
+
+  if (!demux.begin(file)){
+    Serial.println("Failed to open demuxer!");
+    return;
+  }
+}
+
+void loop() {
+  demux.copy();
+}