labs.hellokeita.com

Well, I went to the Flash On The Beach for the first time this year. Was really cool and inspiring.

The first night, I had some inspiration, nothing to deal to any of the presentations I saw, but just something that I wanted to test. I couldn’t upload it because I didn’t have internet at the hotel, and at the venue the firewall was blocking me to connect to my FTP.

So, what was my experiment this time?
Gesture!
I think it’s working quite nice for a code I took less than an hour to write. It was much easier than I thought.

Just click and try to draw a Triangle, Circle or Square.

The source… well, I’m preparing for my LFPUG presentation so, I’ll try to explain about it there, and than release some kind of source.

There is a post from my friend Li http://www.lidev.com.ar/?p=237 where he is using more accurate algorithm to change the pitch. There’s not much loss on quality and no clips.

I’m releasing this little interface for music composing.

http://www.hellokeita.in/komposer/

I tried to make as similar to a MIDI editing software.
Ok…, it’s really far to be similar… but I’m trying…
There’s somethings that I didn’t like in Flex so maybe I’ll start recreate all just with AS3.

Well, about the functionalities…

Click ‘Add track’ to add a new Track.
You can change the Edit, Remove or change the Volume.
The Mute and Solo functions are not working yet.
Clicking on Edit, will take you to a sequencer interface.
Double clicking on the Sequencer, you can add a new Note.
You can playback it, change the positions and durations.
Clicking on Close from the Sequencer, you get back to the main screen.
Here you can playback all the tracks together.

After all, you can save/load the composition to/from you local hard drive.

Enjoy, and give me some feedback please.

UPDATE: fixed the clicking noise correcting the zero-crossing, thanks to Caco Teixeira

Just another test now controlling the pitch and the tempo of the playback.
Source… soon, I’m re-writing the classes trying new approaches.

Has been a while Flash 10 has been released and I never got really into the new sound capabilities.

So, here is a demo I made with the best game sound track ever.

Dragging the points in the graph will change the tone of the sound.

And of course, here is the source.

Komposer_0.0.1.zip.

And a quick explanation about the code.

Komposer is the main class, who will playback the music.
Timbre is the class that defines the tone of the sound.
Track is a groups of notes that will play with the defined timbre. Currently it will only play one track.
Note is the class that defines the pitch(frequency) and the in/out of the sound.

var komposer:Komposer = new Komposer();

komposer.play();


Komposer_0.0.1.zip.

I just found out something cool using URLRequestHeaders in AIR.

Using the “Range” header, you can download specific part of a file.


var urlLoader:URLLoader = new URLLoader();
var urlRequest:URLRequest = new URLRequest("http://upload.wikimedia.org/wikipedia/commons/f/f2/Fanciful_Landscape-1834-Thomas_Doughty.jpg");
urlRequest.method = "GET";
urlRequest.requestHeaders = [new URLRequestHeader("Range", "bytes=0-99")];
urlLoader.addEventListener(Event.COMPLETE, loaded);
urlLoader.load(urlRequest);

function loaded(e:Event):void{
trace(e.currentTarget.data);
}

In this example above, it will load just the first 100 bytes of the file.

I don’t know if there is other ways to do it, but, at least it worked fine for me.

With this, you can manage downloads for huge files pausing and resuming not loosing datas.
Like, if the internet connection breaks while you are downloading something, you can simply resume after the internet connection comes back.

Hi,

After a long time, I uploaded a class in my SVN.
http://code.hellokeita.in/public/trunk/as3/br/hellokeita/utils/MathUtils.as

It’s a small class br.hellokeita.utils.MathUtils.
Inside, there are few methods: combination, factorial, solveCramer and squareMatrixDeterminant.
I think method name tells what it does, so please check it out and comment about it.

cheers,
k