November 2008
Intermediate to advanced
512 pages
12h 6m
English
Content preview from Coding4FunBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Putting It All Together
At this point, you've seen how we can:
Convert YouTube's API XML into objects
Download a YouTube video and a YouTube image thumbnail
Convert a YouTube video into WMV and MP4 formats
Sync videos to iTunes and Zune
What we now want to do is combine those four tasks and make them run asynchronously, so that we can still use our application while we're downloading videos. To do all of the tasks just listed asynchronously, we'll use the InnerTubeFeedWorker class.
To give you an idea of the size of the asynchronous operations that InnerTube needs to do, let's walk through an example set of feeds that an InnerTube user might have:
- Top Rated Videos of All Time
This represents the top-rated videos that have ever been on YouTube.
- Most Viewed Videos This Week
This represents the most viewed videos for the current week.
That means that, at a high level, InnerTubeFeedWorker needs to do the following:
Make two HTTP requests to YouTube's API for each feed (two feeds requested once each).
Make 50 image download requests for the thumbnails (2 feeds × 25 videos each = 50 images).
Make 50 session token requests to get a valid token to download a video (2 feeds × 25 videos = 50 requests), and then make another 50 download video requests for the FLV videos (2 feeds × 25 videos each = 50 video files).
Convert all 50 videos from the Flash format to Windows Media Video (WMV) format. If the user has opted to sync with iTunes, this would mean 100 video conversions because each video would need ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.