Miscellany

#include "SDL.h"
#include "SDL_audio.h"
void PlaySound(char* file);
int main()
{
  extern void mixaudio(void *unused, Uint8 *stream, int len);
  SDL_AudioSpec fmt;

  /* Set 16-bit stereo audio at 22Khz */
  fmt.freq = 22050;
  fmt.format = AUDIO_S16;
  fmt.channels = 2;
  fmt.samples = 512; /* A good value for games */
  fmt.callback = mixaudio;
  fmt.userdata = NULL;

  /* Open the audio device and start playing sound! */
  if ( SDL_OpenAudio(&fmt, NULL) < 0 ) {
    fprintf(stderr, "Unable to open audio: %sn", SDL_GetError());
    exit(1);
  }
  PlaySound("PicWinStudios.wav");
  SDL_CloseAudio();//closes the audio and setting the fmt to null
  return 0;
}

#define NUM_SOUNDS 2
struct sample {
  Uint8 *data;
  Uint32 dpos;
  Uint32 dlen;
} sounds[NUM_SOUNDS];

void PlaySound(char *file) {
  int index;
  SDL_AudioSpec wave;
  Uint8 *data;
  Uint32 dlen;
  SDL_AudioCVT cvt;

  /* Look for an empty (or finished) sound slot */
  for ( index=0; index<NUM_SOUNDS; ++index ) {
    if ( sounds[index].dpos == sounds[index].dlen ) {
      break;
    }
  }
  if ( index == NUM_SOUNDS )
    return;

  /* Load the sound file and convert it to 16-bit stereo at 22kHz */
  if ( SDL_LoadWAV(file, &wave, &data, &dlen) == NULL ) {
    fprintf(stderr, "Couldn't load %s: %sn", file, SDL_GetError());
    return;
  }
  SDL_BuildAudioCVT(&cvt, wave.format, wave.channels, wave.freq, AUDIO_S16, 2, 22050);
  int bufTmp = dlen*cvt.len_mult;
  cvt.buf = (Uint8*)bufTmp;
  memcpy(cvt.buf, data, dlen);
  cvt.len = dlen;
  SDL_ConvertAudio(&cvt);
  SDL_FreeWAV(data);

  /* Put the sound data in the slot (it starts playing immediately) */
  if ( sounds[index].data ) {
    free(sounds[index].data);
  }
  SDL_LockAudio();
  sounds[index].data = cvt.buf;
  sounds[index].dlen = cvt.len_cvt;
  sounds[index].dpos = 0;
  SDL_UnlockAudio();
}
void mixaudio(void *unused, Uint8 *stream, int len)
{
  int i;
  Uint32 amount;
  for ( i=0; i<NUM_SOUNDS; ++i ) {
    amount = (sounds[i].dlen-sounds[i].dpos);
    if (signed(amount) > len) {
      amount = len;
    }
    SDL_MixAudio(stream, &sounds[i].data[sounds[i].dpos], amount, SDL_MIX_MAXVOLUME);
    sounds[i].dpos += amount;
  }
}