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I am looking for a library that will allow me to work with sound. This is just something that occurred to me and the problem is that in a large music collection I need to find tracks similar to another reference track . The simplest of things would be to find tracks with the same/almost-the-same tempo . Is this possible and are there any tools available for this ?
Finding music which is similar to other music is quite a complex field, and will probably require quite a bit of work if you're willing to spend quite a bit of time. If Java is your language of choice, then you could have a look at coMIRVA which will let you compare music based on timbre. From my experience, doing comparisons on that single dimensions isn't always good enough, but it is at least a start.
There's always the other path, which is to use an already existing commercial offering such as the Echo Nest and BMAT. I don't know what they cost, but it's probably quite pricey. However, these are products that have taken years to develop so I assume they must at least provide some sort of value.
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Is there a tool out there for minifying java source code?
I am aware there is not much practical need for such a tool, but I am interested to reduce some students' code to 'bare bones' to show how their variable names are interpreted (sort-of -- it will heopfully re-enforce that their choice of variable names are disregarded) by the compiler. (The next step in this pedagogical process might be to show them the compiled code).
Thanks.
In the java world we mostly speak, due to the purpose, of obfuscation (even if in my opinion the impact on application file size can be useful, I used it a lot on Android applications a few years ago).
The best java obfuscator is probably Progard. Like all of them, it can reduce all (non exported) class and/or variable names to just a letter, which is part of the obfuscation as well as part of a minification.
You will have to decompile the bytecode afterwards if you want to show some java.
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I am looking for a library that can accept a chunk of audio data and return the average amplitude over time within a given frequency band.
I've already asked this question over at comp.dsp, but it's clear to me that acquiring the know-how to build this on my own using a basic FFT library is going to require more time and energy than I have at present. Here is my original question with more detai: http://groups.google.com/group/comp.dsp/browse_thread/thread/e04f78d439e9e2bd
I've found lots of nice libraries for playing with sound (I used JSyn in the past), but none of these seem to be set up to return quick and dirty spectral information about a sound sample.
Any pointers would be much appreciated.
This Archived Blog shows a java implementation of the FFT algorithm which is very concise and reads audio files and calculates the frequency spectrum.
You could also check Jtranforms open source FFT library
Unfortunately the blog is gone, here are some other resources on FFT.
http://web.archive.org/web/20160301081621/http://www.wikijava.org/wiki/The_Fast_Fourier_Transform_in_Java_(part_1)
http://www.royvanrijn.com/blog/2010/06/creating-shazam-in-java/
Not java but added for the explanation: https://jakevdp.github.io/blog/2013/08/28/understanding-the-fft/
have a look at the jAudio package in jMir, there is probably much more than what you need ...
Have you taken a look at this:
http://download.oracle.com/javase/tutorial/sound/TOC.html
I have also used the Java Media Framework for video processing but I believe that they provide a good API for sound processing too. You should also look into that.
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I am interested in an array of software ideas and use more than one language, is there somewhere that concisely lists software development conferences year by year? I'd like to know what options are out there for this year and searching by ideology/language isn't practical in my opinion to get an overall.
Some ideologies/languages that interest me (but open to others):
TDD (with various languages, not just Java)
Agile (w/Scrum, Kanban)
Java
C++
.NET/C#
Development Tools (IDE, Debuggers, etc...)
Not a listing but I use http://www.infoq.com/ to watch videos of past conferences.
ConfRadar is a really nice to tool to find out about conferences. I am sure you'll find what you are looking for.
Just a list of conferences which I see useful http://lanyrd.com/topics/software-development/
Plancast just launched an O'Reilly section. Not exactly what you're looking for, but might be useful.
http://plancast.com/oreilly
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I'm trying to get the best possible performance from my quad core cpus, and i just discovered Parallel Colt (matrix-related operations).
Do you know any other package that include useful "parallel" utils (es. spanning tree, sorting, so on...)
you might want to take a look here:
java.util.concurrent that came with Java 5
I know this isn't exactly an answer to your question, but you might be interested in Scala. I believe utilizing many cores is one of the goals of Scala.
It also runs on the JVM so it interacts with java, is blazingly fast and contains all the new wizzy language features you might expect in a new language (and then some).
I suggest a package called LeoTask: https://github.com/mleoking/leotask
It helps you conduct tasks and aggregate the results in parallel.
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I'm looking into making a 2D game in Java and I've run into a problem with animation: how do I do tweening in Java? Are there any libraries or maybe something I can find bindings for?
Also, please understand that I do not want to simply move an image, I want to do morphing in a way that when making drawings for animation I can use a few keyframes to fill in the in-between frames to generate the animation.
I built an Universal Tween Engine for Java:
http://code.google.com/p/java-universal-tween-engine/
Tweens can be applied to every object (no just graphics objects, everything!), every object attribute can be tweened, and it supports every Robert Penner easing equation too.
Also, the engine is optimized to not instantiate anything at runtime (except during initialization), so it can be used for Android games without fearing the garbage collector.
The timing framework is what I think you are looking for.
Also I can well recommend the book Filthy Rich Clients if you are it to writing rich apps.
An alternative is also the jgoodies:Animation library