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• #1604 emitter őstag emitter #1599

  Új Válasz 2006-04-15 16:19:28 #1604

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  őstag

  válasz emitter #1599 üzenetére

  van ez a fv:
  
  /* Load a music file */
  Mix_Music *myMix_LoadMUS(const char *file)
  {
  FILE *fp;
  char *ext;
  Uint8 magic[5], moremagic[9];
  Mix_Music *music;
  
  /* Figure out what kind of file this is */
  fp = fopen(file, ''rb'');
  if ( (fp == NULL) || !fread(magic, 4, 1, fp) ) {
  if ( fp != NULL ) {
  fclose(fp);
  }
  Mix_SetError(''Couldn't read from '%s''', file);
  return(NULL);
  }
  if (!fread(moremagic, 8, 1, fp)) {
  Mix_SetError(''Couldn't read from '%s''', file);
  return(NULL);
  }
  magic[4] = '\0';
  moremagic[8] = '\0';
  fclose(fp);
  
  /* Figure out the file extension, so we can determine the type */
  ext = strrchr(file, '.');
  if ( ext ) ++ext; /* skip the dot in the extension */
  
  /* Allocate memory for the music structure */
  music = (Mix_Music *)malloc(sizeof(Mix_Music));
  if ( music == NULL ) {
  Mix_SetError(''Out of memory'');
  return(NULL);
  }
  music->error = 0;
  
  #ifdef CMD_MUSIC
  if ( music_cmd ) {
  music->type = MUS_CMD;
  music->data.cmd = MusicCMD_LoadSong(music_cmd, file);
  if ( music->data.cmd == NULL ) {
  music->error = 1;
  }
  } else
  #endif
  #ifdef WAV_MUSIC
  /* WAVE files have the magic four bytes ''RIFF''
  AIFF files have the magic 12 bytes ''FORM'' XXXX ''AIFF''
  */
  if ( (ext && MIX_string_equals(ext, ''WAV'')) ||
  ((strcmp((char *)magic, ''RIFF'') == 0) && (strcmp((char *)(moremagic+4), ''WAVE'') == 0)) ||
  (strcmp((char *)magic, ''FORM'') == 0) ) {
  music->type = MUS_WAV;
  music->data.wave = WAVStream_LoadSong(file, (char *)magic);
  if ( music->data.wave == NULL ) {
  Mix_SetError(''Unable to load WAV file'');
  music->error = 1;
  }
  } else
  #endif
  #ifdef MID_MUSIC
  /* MIDI files have the magic four bytes ''MThd'' */
  if ( (ext && MIX_string_equals(ext, ''MID'')) ||
  (ext && MIX_string_equals(ext, ''MIDI'')) ||
  strcmp((char *)magic, ''MThd'') == 0 ||
  ( strcmp((char *)magic, ''RIFF'') == 0 &&
  strcmp((char *)(moremagic+4), ''RMID'') == 0 ) ) {
  music->type = MUS_MID;
  #ifdef USE_NATIVE_MIDI
  if ( native_midi_ok ) {
  music->data.nativemidi = native_midi_loadsong((char *)file);
  if ( music->data.nativemidi == NULL ) {
  Mix_SetError(''%s'', native_midi_error());
  music->error = 1;
  }
  } MIDI_ELSE
  #endif
  #ifdef USE_TIMIDITY_MIDI
  if ( timidity_ok ) {
  music->data.midi = Timidity_LoadSong((char *)file);
  if ( music->data.midi == NULL ) {
  Mix_SetError(''%s'', Timidity_Error());
  music->error = 1;
  }
  } else {
  Mix_SetError(''%s'', Timidity_Error());
  music->error = 1;
  }
  #endif
  } else
  #endif
  #ifdef OGG_MUSIC
  /* Ogg Vorbis files have the magic four bytes ''OggS'' */
  if ( (ext && MIX_string_equals(ext, ''OGG'')) ||
  strcmp((char *)magic, ''OggS'') == 0 ) {
  music->type = MUS_OGG;
  music->data.ogg = OGG_new(file);
  if ( music->data.ogg == NULL ) {
  music->error = 1;
  }
  } else
  #endif
  #ifdef MP3_MUSIC
  if ( (ext && MIX_string_equals(ext, ''MPG'')) ||
  (ext && MIX_string_equals(ext, ''MP3'')) ||
  (ext && MIX_string_equals(ext, ''MPEG'')) ||
  magic[0]==0xFF && (magic[1]&0xF0)==0xF0) {
  SMPEG_Info info;
  music->type = MUS_MP3;
  music->data.mp3 = SMPEG_new(file, &info, 0);
  if(!info.has_audio){
  Mix_SetError(''MPEG file does not have any audio stream.'');
  music->error = 1;
  }else{
  SMPEG_actualSpec(music->data.mp3, &used_mixer);
  }
  } else
  #endif
  #if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)
  if ( 1 ) {
  music->type = MUS_MOD;
  music->data.module = MikMod_LoadSong((char *)file, 64);
  if ( music->data.module == NULL ) {
  Mix_SetError(''%s'', MikMod_strerror(MikMod_errno));
  music->error = 1;
  } else {
  /* Stop implicit looping, fade out and other flags. */
  music->data.module->extspd = 1;
  music->data.module->panflag = 1;
  music->data.module->wrap = 0;
  music->data.module->loop = 0;
  #if 0 /* Don't set fade out by default - unfortunately there's no real way
  to query the status of the song or set trigger actions. Hum. */
  music->data.module->fadeout = 1;
  #endif
  }
  } else
  #endif
  {
  Mix_SetError(''Unrecognized music format'');
  music->error = 1;
  }
  if ( music->error ) {
  free(music);
  music = NULL;
  }
  return(music);
  }
  
  ---------------
  
  a végén halálozik el:
  ...
  Mix_SetError(''Unrecognized music format'');
  music->error = 1;
  }
  if ( music->error ) {
  free(music);
  music = NULL;
  }
  return(music);
  }
  
  szóval errort-t 1-re állítja, és ezért NULL-pointerrel tér vissza.. a kérdésem, hogy az #ifdef és #endif tagok mit csinálnak pontosan, kellenek ezek egyáltalán bele?
  vagy van olyan elsőre szemet szúró dolog, ami miatt ez történik?

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