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The first thing to note in Listing 10-30 is that you prevent the use of the default constructor for the derived class by marking it private; instead, you create a constructor that accepts a Stream This Stream represents an open stream to the video file that this MediaStreamSource implementation is supposed to parse and decode, and the expectation is that the consuming application passes that in when constructing the MediaStreamSource for the first time You then save the Stream in a member variable for future access and also invoke the ParseMediaStream() method to parse the metadata Recall from Figure 10-25 that the video file format includes the size of the metadata block at the beginning of the file and the actual metadata block at the end of the file, with the recorded frames in between In ParseMediaStream(), you first read the length of the metadata block.

In Listing 4-7, there are, in fact, a total of three ID spaces two window components, winA and winC, and a page component, page1 , which is another kind of space owner: The page1 ID space has winA, vboxF, and labelG as fellows. The winA ID space has winA, hboxB, labelD, winC, labelE as fellows. The winC ID space has winC and labelE as fellows.

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You then seek into the file to position the file pointer at the beginning of the metadata block and read the number of bytes from the tail end of the file as specified by the size information you just retrieved You trim the byte array for any null byte entries at the tail and then deserialize it into an instance of the MediaInfo class at the end of Listing 10-28 You now have the metadata handy Next, the MediaElement invokes the OpenMediaAsync() method, which is where you initialize the media and return the necessary metadata to prime the MediaElement for play You begin by calculating the frame size in bytes.

to see if they re rigorous in reasoning about their code, and if they re diplomatic yet firm in asserting that the code is perfect. As the last step in an interview, ask the candidate if they have any questions. Remember, even though you re interviewing them, the good candidates have lots of choices about where to work, and they re using this day to figure out if they want to work for you. Some interviewees try to judge if the candidate asks intelligent questions. Personally, I don t care what questions they ask; by this point I ve already made my decision. The trouble is, candidates have to see about five or six people in one day, and it s hard for them to ask five or six people different, brilliant questions, so if they don t have any questions, fine. I always leave about five minutes at the end of the interview to sell the candidate on the company and the job. This is actually important even if you are not going to hire them. If you ve been lucky enough to find a really good candidate, you want to do everything you can at this point to make sure that they want to come work for you. Even if they are a bad candidate, you want them to like your company and go away with a positive impression.

To do so, you multiply the FrameHeight and the FrameWidth from the MediaInfo metadata instance to get the number of pixels; then, you multiply the product further by 4, because each pixel is a 4byte structure with 1 byte for the Red, Blue, and Green color channels and the last byte for the alpha or transparency channel You store the frame size in the FrameSize variable You also calculate the duration of a frame in ticks from MediaInfoFrameRate and store the result in the FrameDuration variable The lastFrame variable keeps track of the last frame consumed by the MediaElement and is initialize to 0 Then, you populate the various metadata structures that you need to return to the MediaElement You have declared the mediaSourceAttributes variable of type Dictionary<MediaSourceattributesKeys,string> to be the container for the media source metadata You populate this by setting MediaSourceAttributesKeys.

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