/*
  Simple Audio Player

 Demonstrates the use of the Audio library for the Arduino Due

 Hardware required :
 * Arduino shield with a SD card on CS4
 * A sound file named "test.wav" in the root directory of the SD card
 * An audio amplifier to connect to the DAC0 and ground
 * A speaker to connect to the audio amplifier

 Original by Massimo Banzi September 20, 2012
 Modified by Scott Fitzgerald October 19, 2012
 Modified by Arturo Guadalupi December 18, 2015

 This example code is in the public domain

 http://www.arduino.cc/en/Tutorial/SimpleAudioPlayer

*/

#include <SD.h>
#include <SPI.h>
#include <Audio.h>

void setup() {
  // debug output at 9600 baud
  Serial.begin(115200);

  // setup SD-card
  Serial.print("Initializing SD card...");
  if (!SD.begin(4)) {
    Serial.println(" failed!");
    while(true);
  }
  Serial.println(" done.");
  // hi-speed SPI transfers

  // 44100kHz stereo => 88200 sample rate
  // 100 mSec of prebuffering.
  Audio.begin(1000, 100);
}

void loop() {
  // open wave file from sdcard
  File myFile = SD.open("test.wav");
  if (!myFile) {
    // if the file didn't open, print an error and stop
    Serial.println("error opening test.wav");
    while (true);
  }

  const int S = 1024; // Number of samples to read in block
  short buffer[S];

  Serial.print("Playing");
  // until the file is not finished
  while (myFile.available()) {
    // read from the file into buffer
    myFile.read(buffer, sizeof(buffer));

    // Prepare samples
    int volume = 7000;
    Audio.prepare(buffer, S, volume);
    // Feed samples to audio
    Audio.write(buffer, S);
  }
  myFile.close();

  Serial.println("End of file. Thank you for listening!");
  while (true) ;
}