ESP32_MP3_I2S

ESP32_MP3_I2S.ino

/*
Rember to upload LittleFS data from data folder after code upload!

CTRL + SHIFT + P -> "Upload LittleFS ...."

Get the upload plugin for IDE V2.2.1+ from: https://github.com/earlephilhower/arduino-littlefs-upload 

*/

#include <Arduino.h>


#ifdef ESP32
#include <WiFi.h>
#include <FS.h>
#define SPIFFS LittleFS //It't this thing that ESP32 uses instead of SPIFFS: https://github.com/espressif/arduino-esp32/tree/master/libraries/LittleFS - 
#include <LittleFS.h> 
#include "AudioFileSourceSPIFFS.h"
#include "AudioFileSourceID3.h"
#include "AudioGeneratorMP3.h"
#include "AudioOutputI2S.h"

// To run, set your ESP8266 build to 160MHz, and include a SPIFFS of 512KB or greater.
// Use the "Tools->ESP8266/ESP32 Sketch Data Upload" menu to write the MP3 to SPIFFS
// Then upload the sketch normally.  

// pno_cs from https://ccrma.stanford.edu/~jos/pasp/Sound_Examples.html

AudioGeneratorMP3 *mp3;
AudioFileSourceSPIFFS *file;
AudioOutputI2S *out = NULL;
AudioFileSourceID3 *id3;

int BCLK = 16; //Bitclock
int LRCLK = 17; //wordclock (Left/right)
int DOUT = 21; //data

// Called when a metadata event occurs (i.e. an ID3 tag, an ICY block, etc.
void MDCallback(void *cbData, const char *type, bool isUnicode, const char *string)
{
  (void)cbData;
  Serial.printf("ID3 callback for: %s = '", type);

  if (isUnicode) {
    string += 2;
  }
  
  while (*string) {
    char a = *(string++);
    if (isUnicode) {
      string++;
    }
    Serial.printf("%c", a);
  }
  Serial.printf("'\n");
  Serial.flush();
}


void setup()
{
  WiFi.mode(WIFI_OFF); 
  Serial.begin(115200);
  delay(1000);
  SPIFFS.begin();
  Serial.printf("Sample MP3 playback begins...\n");

  audioLogger = &Serial;
  file = new AudioFileSourceSPIFFS("/creeper.mp3");
  id3 = new AudioFileSourceID3(file);
  id3->RegisterMetadataCB(MDCallback, (void*)"ID3TAG");
  out = new AudioOutputI2S();
  out->SetOutputModeMono(true);
  out->SetPinout(BCLK, LRCLK, DOUT);

  mp3 = new AudioGeneratorMP3();
  mp3->begin(id3, out);
}

void loop()
{
  if (mp3->isRunning()) {
    if (!mp3->loop()) mp3->stop();
  } else {
    Serial.printf("MP3 done\n");
    delay(1000);
  }
}
#endif