i want to replay the sound

Using Arduino Audio
12

This is confusing:

#ifdef NFC_DEMO_DEBUG
#endif

What's the point?

I'll get rid of all the #ifdef:

#include <PN532.h>
#include <SPI.h>
#include <SimpleSDAudio.h>
#define PN532_CS 10
PN532 nfc(PN532_CS);

void setup() 
{
  nfc.begin();
  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) 
  {
    while (1); // halt
  }
  nfc.SAMConfig();

} // end of setup

void loop(void)
{
  uint32_t id;
  id = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A);

  if (id != 0)
  {
    Serial.print("Read card #");
    Serial.println(id);
    if(id==4251492471)
    {
      if (SdPlay.init(SSDA_MODE_FULLRATE | SSDA_MODE_MONO))
      {
        if(SdPlay.setFile("12.afm"))
        {
          SdPlay.play();
          while(!SdPlay.isStopped())
          {
            SdPlay.worker();
          }
        }
      }
    }
  }
}

You have this:

    Serial.print("Read card #");
    Serial.println(id);

But no Serial.begin.

OK, now we can read the code, what is the problem exactly?

I don't understand this:

it's work good

but for one time not work as a loop!!!!