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SDK 初始化
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.. code-block:: html

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd-HHmmss"];
    NSString *destDateString = [dateFormatter stringFromDate: [NSDate date] ];
    NSString *fileName =[NSString stringWithFormat:@"/%@.log", destDateString];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docDir = [paths objectAtIndex:0];
    fileName = [docDir stringByAppendingPathComponent:fileName];

    [[AVDEngine instance] setLogParams:@"info debug" file:fileName];
    [[AVDEngine instance] initWithServerUrl:serverURL accessKey:appKey secretKey:secretKey delegate:self];