labs.hellokeita.com » Komposer

LFPUG Presentation and Sources

keita — Mon, 07 Sep 2009 10:01:56 +0000

As promissed, here is the presentation I made at LFPUG in PDF format.

http://www.hellokeita.in/presentations/LFPUG/20090827/MakingMusicFP10.pdf

And the source files zipped with the demos I showed.

http://www.hellokeita.in/presentations/LFPUG/20090827/examples.zip
The contents are:
Example01-SineWaveExample: Simple example generating a sine wave
Example02-KeyboardExample: Example of a piano keyboard
Example03-WaveformExample: Changing the waveform of a sound
Example04-TimePitchExample: Changing pitch and tempo of a mp3
Example05-HeliumBalloon: Real time pitch shifting using Java

Enjoy!

UPDATE
LFPUG website uploaded the video of my presentation
http://www.lfpug.com/flash-10-making-music/

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LFPUG Presentation

keita — Wed, 26 Aug 2009 13:22:27 +0000

Tomorrow Aug 27th, I’ll be presenting at LFPUG (London Flash Platform User Group) about dynamic sound in Flash 10.

Feel free to pop-up there, it’s for free.

Here is the link:
http://www.lfpug.com/27th-august-2009-27082009/

Signing up, you’ll have a chance to get a Flash On The Beach ticket!

Time: 19:00 – 23:00 (doors open at 18:30)
Venue: CosmoBar, 50-54 Clerkenwell Road, EC1M 5PS (click for map)
Tube: Barbican/Farringdon

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Fake Pitch Shifting

keita — Tue, 18 Aug 2009 16:24:52 +0000

Pitch shifting is the method to change the frequency or the height of a sound.
And why it’s fake? Because, I’m really not using the correct algorithm, actually I just made one for demo purpose. If you listen carefully, you can hear some clippings when you change the slider position.

There is a difference between my previous post about pitch Controlling Pitch and Tempo.
The previous one I was using a dynamically generated sine wave and changing the pitch. It’s much easier because I already have the samples for each sound.

On this example I’m using an MP3 file (Daft Punk, please don’t sue me…If you want, I can change it) and changing the pitch on runtime.

Well it’s working, and as you can see no FPS loss.

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.

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Komposer alpha test release

keita — Sun, 31 May 2009 22:24:29 +0000

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.

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Controlling Pitch and Tempo

keita — Tue, 19 May 2009 17:44:10 +0000

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.

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Creating music in AS3 Flash 10

keita — Fri, 15 May 2009 17:18:28 +0000

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();


var timbre:Timbre = new Timbre();

timbre.addValue(0);

timbre.addValue(1);

timbre.addValue(-1);

timbre.addValue(0);
var track:Track = new Track(timbre);
track.addNote(new Note(Notes.toFrequency(Notes.C, Notes.OCTAVE_4), 0, 500));

track.addNote(new Note(Notes.toFrequency(Notes.D, Notes.OCTAVE_4), 500, 1000));

track.addNote(new Note(Notes.toFrequency(Notes.E, Notes.OCTAVE_4), 1000, 1500));

track.addNote(new Note(Notes.toFrequency(Notes.F, Notes.OCTAVE_4), 1500, 2000));

track.addNote(new Note(Notes.toFrequency(Notes.G, Notes.OCTAVE_4), 2000, 2500));

track.addNote(new Note(Notes.toFrequency(Notes.A, Notes.OCTAVE_5), 2500, 3000));

track.addNote(new Note(Notes.toFrequency(Notes.B, Notes.OCTAVE_5), 3000, 3500));

track.addNote(new Note(Notes.toFrequency(Notes.C, Notes.OCTAVE_5), 3500, 4000));
komposer.addTrack(track);
komposer.volume = 0.1;

komposer.play();

Komposer_0.0.1.zip.

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