Ruby audio APIs [closed] - ruby

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I'm working on a simple musical instrument tuner in Ruby (2.0.0) using GTK. When it comes to audio playback though, I don't know where to start looking for a suitable gem. Any recommendations? My idea was to package audio files of the 12 notes of the chromatic scale, but I can't seem to find audio samples of these.
I should also say that I'd much prefer if it was cross-platform!

Not sure it can help you, but the only one I came across is this one
It's based on libsndfile
You might also wanna checkout this simple audio player using GTK on SouceForge.

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I would like to develop web games using Ruby, but I can't find any framework for that. Can I use Gosu to create the game and then just compile it to js (with Opal, for example)?
Here are two libraries for writing browser games with Ruby:
dare
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If you're going to be using Opal, you should probably test Javascript compilation as you build.

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Is there an open source Ruby framework that allows working with multimedia (video, sound, etc) similar to Flash, including Display Object hierarchy, that is not targeted for video games?
I'm looking for something between Ruby/Processing with a more object oriented API.
You could take a look at Ruby-Processing that runs on jruby.

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I am trying to fiddle with linux audio sub-system. Basically, I am trying to understand how audio input/ouput flows (use of audio encoders etc) when running a linux image on Vbox. Anyone know a good place to start or a good book to refer to.
Your best bet is to follow the Linux Audio User Group. They have a number of resources on their website and their mailing list is also quite active.
This should act as a good starter guide: http://lau.linuxaudio.org/Sound-HOWTO.html

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Does anyone know what open-source library Google uses for its Google Similar Image?
I need to find the similarity of two images of different sizes but slightly similar content. I need to get a metrics value.
Have you looked at SourceForge or Google Code?
This project looks very good. And the tag ImageProcessing has 249 hits. Surely you will find something there.
Btw, do you have any requirements w.r.t. OS, programming language, etc?

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Is there a solid, production ready library in Ruby that interacts with the Flickr API?
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