WeMos ESP8266Audio code for playing Foo Fighter through Conrad the Camel see https://hackaday.io/project/165395-conrad-the-camel-plays-foo-fighters

conrad-foo.ino

#include <ESP8266WiFi.h>
#include "AudioFileSourceSPIFFS.h"
#include "AudioGeneratorWAV.h"
#include "AudioOutputI2SNoDAC.h"
#include <ESP8266SAM.h>

AudioGeneratorWAV *audio;
AudioFileSourceSPIFFS *file;
AudioOutputI2SNoDAC *out;
ESP8266SAM *sam;

#define BUTTON_PIN D1
#define MOTOR_PIN D2

void setup()
{
  WiFi.mode(WIFI_OFF); 
  pinMode(RX, INPUT);
  pinMode(BUTTON_PIN, INPUT);
  pinMode(MOTOR_PIN, OUTPUT);
  digitalWrite(MOTOR_PIN, HIGH);

  //if(digitalRead(BUTTON_PIN)==LOW)
  //  ESP.deepSleep(2e6);

  Serial.begin(115200);
  delay(100);
  Serial.println("Starting...");

  file = NULL;
  out = new AudioOutputI2SNoDAC();  //Outputs on RX pin
  audio = new AudioGeneratorWAV();
  
  //  sam = new ESP8266SAM;
  //  sam->SetSingMode(true);
  //  sam->SetSpeed(50);
  //  //enum SAMVoice { VOICE_SAM, VOICE_ELF, VOICE_ROBOT, VOICE_STUFFY, VOICE_OLDLADY, VOICE_ET };
  //  //for(ESP8266SAM::SAMVoice v=ESP8266SAM::VOICE_SAM; v<=ESP8266SAM::VOICE_ET; ++(int&)v) {
  //    //sam->SetVoice(v);
  //  sam->Say(out, "What if I say I'm not like the others.");
  //  sam->Say(out, "What if I say I'm not just another, one of your plays.");
  //  sam->Say(out, "You're the pretender.  What if I say I will never surrender.");
}

bool pressed = false;
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelayMs = 50;    // the debounce time
int lastButtonState = LOW;   // the previous reading from the input pin
unsigned long sleepDelayS = 5;    // go back into sleep mode

void loop()
{
  //Debounce the button (either going up or down) and trigger on button release
  int reading = digitalRead(BUTTON_PIN);
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }
  lastButtonState = reading;
  bool trigger = false;
  if ((millis() - lastDebounceTime) > debounceDelayMs)
  {
    if(reading==HIGH)
    {
      pressed = true;
      Serial.println("Button high");
    }
    else if(pressed) //and button now low
    {
      pressed = false;
      trigger = true;
      Serial.println("Button low");
    }
  }
  if (audio->isRunning()) {
    if (trigger || !audio->loop()) {
      audio->stop();
      digitalWrite(MOTOR_PIN, HIGH);
    }
  } 
  else if(trigger)
  {
    Serial.print("Starting audio...");
    delete file;
    file = new AudioFileSourceSPIFFS("/pret4amp16k.wav");
    if(audio->begin(file, out))
      Serial.println("OK");
    else
      Serial.println("failed...");  
    digitalWrite(MOTOR_PIN, LOW);
  }
  //  if ((millis() - lastDebounceTime) > (sleepDelayS*1e3)) {
  //    Serial.println("Going back to sleep");
  //    ESP.deepSleep(2e6);
  //  }
}