ExtAudioConverter音频转换格式

将音频文件比如mp3、caf等音频文件制作为铃声，但是库乐队app需要文件.band的格式才能打开

ExtAudioConverter 讲音频转换成.aiff格式//生成新的BandFilePath

- (NSString*)generateBandFile:(NSString*)filePath{

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *fileName = [[filePath lastPathComponent] stringByDeletingPathExtension];

    NSString* cachePath=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0];

    NSString*tmpBandDir = [cachePathstringByAppendingPathComponent:fileName];

    if([fileManagerfileExistsAtPath:tmpBandDir]) {

        [fileManagerremoveItemAtPath:tmpBandDirerror:nil];

    }

    NSString *bandFilePath = [[NSBundle mainBundle] pathForResource:

                              @"bandName"ofType:@"band"];

    if([fileManagerfileExistsAtPath:bandFilePath]){

        [fileManagercopyItemAtPath:bandFilePathtoPath:tmpBandDirerror:nil];

    }

    NSString *ringtonefile = [tmpBandDir stringByAppendingPathComponent:@"Media/ringtone.aiff"];

    ExtAudioConverter* converter = [[ExtAudioConverter alloc] init];

    converter.inputFile= filePath;

    converter.outputFile= ringtonefile;

    converter.outputFileType = kAudioFileAIFFType;

    if([converterconvert]) {

        NSLog(@"转化成功");

    }

    NSString *bandDir = [tmpBandDir stringByAppendingString:@".band"];

    [fileManagermoveItemAtPath:tmpBandDirtoPath:bandDirerror:nil];

    returnbandDir;

}