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libraries/audio-tools/examples/examples-player/player-callback-i2s/player-callback-i2s.ino

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+/**
+ * @file player-sd-callback.ino
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-player/player-callback-i2s/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+
+// Install https://github.com/pschatzmann/arduino-libhelix.git
+
+#include "Arduino.h"
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+#include <SPI.h>
+#include <SD.h>
+
+
+// forward declarations
+void callbackInit();
+Stream* callbackNextStream(int offset);
+
+// data
+const int chipSelect=PIN_CS;
+AudioSourceCallback source(callbackNextStream, callbackInit);
+I2SStream i2s;
+MP3DecoderHelix decoder;
+AudioPlayer player(source, i2s, decoder);
+File audioFile;
+File dir;
+
+void callbackInit() {
+  // make sure that the directory contains only mp3 files
+  dir = SD.open("/TomWaits");
+}
+
+Stream* callbackNextStream(int offset) {
+  audioFile.close();
+  // the next files must be a mp3 file
+  for (int j=0;j<offset;j++)
+    audioFile = dir.openNextFile();
+  return &audioFile;
+}
+
+void callbackPrintMetaData(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);
+
+  // setup SD
+  SD.begin(chipSelect);
+
+  // setup output
+  auto cfg = i2s.defaultConfig(TX_MODE);
+  i2s.begin(cfg);
+
+  // setup player
+  player.setMetadataCallback(callbackPrintMetaData);
+  player.begin();
+}
+
+void loop() {
+  player.copy();
+}