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

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+/**
+* @file streams-sd_m4a-audiokit.ino
+* @author Peter Schatzmann
+* @brief Example for decoding M4A files on the AudioKit using the AudioBoardStream
+* @version 0.1
+* @date 2023-10-01
+*/
+
+#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/AudioLibs/AudioBoardStream.h" // install https://github.com/pschatzmann/arduino-audio-driver
+#include "SD.h"
+
+MultiDecoder multi_decoder;
+ContainerM4A dec_m4a(multi_decoder);
+AACDecoderHelix dec_aac;
+DecoderALAC dec_alac;
+AudioBoardStream out(AudioKitEs8388V1);
+EncodedAudioOutput decoder_output(&out, &dec_m4a); 
+File file;
+StreamCopy copier(decoder_output, file);     
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // start AudioBoard with setup of CD pins
+  auto cfg = out.defaultConfig(TX_MODE);
+  cfg.sd_active = true;
+  if (!out.begin(cfg)){
+    Serial.println("Failed to start CSV output!");
+    return;
+  }
+
+  if (!SD.begin(PIN_AUDIO_KIT_SD_CARD_CS)){
+    Serial.println("SD Card initialization failed!");
+    return;
+  }
+
+  file = SD.open("/m4a/aac.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;
+  }
+
+  Serial.println("M4A decoding started...");
+}
+
+
+void loop() { 
+  copier.copy();
+}