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libraries/audio-tools/examples/examples-player/player-sd_m4a-audiokit/player-sd_m4a-audiokit.ino

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+/**
+ * @file player-sd-i2s.ino
+ * @brief example using the SD library that shows how to support m4a
+ * aac, mp3 and alac files. We provid a MultiDecoder to the ContainerM4A
+ * so that the container can decode aac and alac. We also provide it to 
+ * the AudioPlayer so that we can play aac, alac, mp4 and m4a files. If
+ * you only want to play m4a files, you can provide the ContainerM4A directly. 
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/Disk/AudioSourceSD.h"
+#include "AudioTools/AudioCodecs/CodecALAC.h"
+#include "AudioTools/AudioCodecs/CodecAACHelix.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+#include "AudioTools/AudioCodecs/ContainerM4A.h"
+#include "AudioTools/AudioCodecs/MultiDecoder.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h" // install https://github.com/pschatzmann/arduino-audio-driver
+
+
+const char *startFilePath="/m4a";
+const char* ext="m4a";
+AudioSourceSD source(startFilePath, ext);
+AudioBoardStream i2s(AudioKitEs8388V1);  // or e.g. I2SStream i2s;
+MultiDecoder multi_decoder;
+ContainerM4A dec_m4a(multi_decoder);
+AACDecoderHelix dec_aac;
+MP3DecoderHelix dec_mp3;
+DecoderALAC dec_alac;
+AudioPlayer player(source, i2s, multi_decoder);
+
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // setup multi decoder
+  multi_decoder.addDecoder(dec_m4a, "audio/m4a");
+  multi_decoder.addDecoder(dec_alac,"audio/alac"); 
+  multi_decoder.addDecoder(dec_aac,"audio/aac"); 
+  multi_decoder.addDecoder(dec_mp3,"audio/mp3"); 
+
+  // setup output
+  auto cfg = i2s.defaultConfig(TX_MODE);
+  i2s.begin(cfg);
+
+  // setup player
+  //source.setFileFilter("*Bob Dylan*");
+  player.begin();
+}
+
+void loop() {
+  player.copy();
+}