MBED Example: How to play WAV sound file from SDCard using SPI and AnalogOut

.from: https://github.com/leroilion/mbed/blob/master/PlayMusic/Examples/PlayMusic/main.cpp

#include "mbed.h"
#include "SDFileSystem.h"

SDFileSystem sd(11, 12, 13, 14, "sd");
AnalogOut aout(18);

int main() {
 int ch;   //first read byte
 int ch2;  //second read byte
 int dat;  //combined 16 bit word for DtoA

 FILE *fp = fopen("/sd/QI2.wav", "r"); //open File to read
 if(fp == NULL) {error("Could not open file for write\n");}

 while(!feof(fp)) {  //Play the music until End Of File
  dat = 0;
  ch = fgetc(fp);  //get first  byte
  ch2 =fgetc(fp);  //get second byte
  ch = ch << 8;    //shift bits 8 places to left 
  dat = ch2 | ch;  //combine bits to single 16 bit int 
  aout.write_u16((unsigned short)(dat)); //DtoA conversion
  wait_us(88); //set for 11k sample rate
  }

 fclose(fp); //close the file

} 

MBED Example: Read RIFF WAV Header

.info: https://github.com/leroilion/mbed/blob/master/PlayMusic/Examples/HeaderReader/main.cpp

#include "mbed.h"
#include "SDFileSystem.h"
#include "MobileLCD.h"

MobileLCD lcd(5, 6, 7, 8, 9);
SDFileSystem sd(11, 12, 13, 14, "sd");

int main() {
 lcd.background(0x0000FF);
    lcd.cls();
 lcd.printf("Header Reader"); 
 lcd.locate(0,2);

 int ch;

 FILE *fp = fopen("/sd/QI2.wav", "r");
 if(fp == NULL) {
  error("Could not open file for write\n");
  lcd.printf("Could not open file for read");
 }


 for(int i = 1; i < 5; i++)  {  //"RIFF"
  ch = fgetc(fp);
  lcd.printf("%c ", ch);
  if(i == 4) {lcd.locate(0,3);
   }
  }
 for(int i = 5; i < 9; i++)  {  //Chunk size
  ch = fgetc(fp);
  lcd.printf("%x ", ch);
  if(i == 8) {lcd.locate(0,4);}
  }

 for(int i = 9; i < 13; i++)  {  //"WAVE"
  ch = fgetc(fp);
  lcd.printf("%c ", ch);
  if(i == 12) {lcd.locate(0,5);}
  } 

 for(int i = 13; i < 17; i++)  {  //ID = "fmt"
  ch = fgetc(fp);
  lcd.printf("%c ", ch);
  if(i == 16) {lcd.locate(0,6);}
  }

 for(int i = 17; i < 21; i++)  {  //Chunk Size
  ch = fgetc(fp);
  lcd.printf("%x ", ch);
  if(i == 20) {lcd.locate(0,7);}
  }

 for(int i = 21; i < 23; i++)  {  //Audio format
  ch = fgetc(fp);     //1 = Uncompressed
  lcd.printf("%x ", ch);
  if(i == 22) {lcd.locate(0,8);}
  }

 for(int i = 23; i < 25; i++)  {  //Channels
  ch = fgetc(fp);     //1 = mono,  2 = stereo
  lcd.printf("%x ", ch);
  if(i == 24) {lcd.locate(0,9);}
  }

 for(int i = 25; i < 29; i++)  {  //Sample Rate
  ch = fgetc(fp);
  lcd.printf("%x ", ch);
  if(i == 28) {lcd.locate(0,10);}
  }

 for(int i = 29; i < 33; i++)  {  //Byte Rate
  ch = fgetc(fp);
  lcd.printf("%x ", ch);
  if(i == 32) {lcd.locate(0,11);}
  }

 for(int i = 33; i < 35; i++)  {  //Align
  ch = fgetc(fp);
  lcd.printf("%x ", ch);
  if(i == 34) {lcd.locate(0,12);}
  }

 for(int i = 35; i < 37; i++)  {  //Bits per Sample
  ch = fgetc(fp);
  lcd.printf("%d ", ch);
  if(i == 36) {lcd.locate(0,13);}
  }

 for(int i = 37; i < 41; i++)  {  //"data"
  ch = fgetc(fp);
  lcd.printf("%c ", ch);
  if(i == 40) {lcd.locate(0,14);}  
  }

 for(int i = 41; i < 45; i++)  {  //data chunk size
  ch = fgetc(fp);
  lcd.printf("%x ", ch);
  }

 fclose(fp);       //close the file
 lcd.locate(0,15);
 lcd.printf("file closed");
}