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libraries/audio-tools/tests-cmake/codec/container-m4a/m4a.ino

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+/**
+ * @file test-codec-alac.ino
+ * @author Phil Schatzmann
+ * @brief generate sine wave -> encoder -> decoder -> audiokit (i2s)
+ * @version 0.1
+ * 
+ * @copyright Copyright (c) 2025
+ * 
+ */
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecALAC.h"
+#include "AudioTools/AudioCodecs/CodecAACHelix.h"
+#include "AudioTools/AudioCodecs/ContainerM4A.h"
+#include "AudioTools/AudioCodecs/MultiDecoder.h"
+#include "AudioTools/AudioCodecs/M4AFileSampleSizeBuffer.h"
+#include "SD.h"
+
+MultiDecoder multi_decoder;
+ContainerM4A dec_m4a(multi_decoder);
+AACDecoderHelix dec_aac;
+DecoderALAC dec_alac;
+CsvOutput<int16_t> out(Serial);
+EncodedAudioOutput decoder_output(&out, &dec_m4a); 
+File file;
+StreamCopy copier(decoder_output, 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;
+  }
+
+  // mp4 supports alac and aac
+  multi_decoder.addDecoder(dec_alac,"audio/alac"); 
+  multi_decoder.addDecoder(dec_aac,"audio/aac"); 
+
+  // start decoder output
+  if(!decoder_output.begin()) {
+    Serial.println("Failed to start decoder output!");
+    return;
+  }
+
+  // start csv output
+  if (!out.begin()){
+    Serial.println("Failed to start CSV output!");
+    return;
+  }
+
+  Serial.println("M4A decoding started...");
+}
+
+
+void loop() { 
+  copier.copy();
+}