获取视频缓冲大小

NSArray *events = playerViewController.moviePlayer.accessLog.events;  
int count = events.count;  
for (int i = 0; i < count; i++)  
{  
    MPMovieAccessLogEvent *currentEvent = [events objectAtIndex:i];  
    double byts = currentEvent.indicatedBitrate;  
    int64_t byte = currentEvent.numberOfBytesTransferred;  
    int64_t bytes = currentEvent.numberOfBytesTransferred >> 10;  
    NSMutableString *strBytes = [[NSMutableString alloc] initWithCapacity:100];  
    [strBytes appendFormat:@"totalSize = %d byte", bytes];  
    if (bytes > 1024)  
    {  
        bytes = bytes >> 10;  
        [bytesS setString:@""];  
        [bytesS appendFormat:@"total = %d M", bytes];  
    }  
    NSLog(@"byte = %f M bytes = %lld", (float)byte / (1024 * 1024), bytes);  
}