代码创建无声音乐方法
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    NSData* data = [NSData dataWithBytes:bytes length:sizeof(bytes)];
    NSString * docsDir = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

    // Build the path to the database file
    NSString * filePath = [[NSString alloc] initWithString:
                           [docsDir stringByAppendingPathComponent: @"background.wav"]];
    [data writeToFile:filePath atomically:YES];

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