Comments on: Generating and Playing Sound in Javascript

By: grafikmuzik

grafikmuzik — Thu, 30 Dec 2010 02:28:11 +0000

Note that the Dynamic WAV Generator is now on this page (the link Michael gave us is broken) : http://www.sk89q.com/playground/jswav/

By: transformer

transformer — Thu, 27 Nov 2008 22:07:13 +0000

As long as you call this an “experiment”… Anyhow, audio/wav is an unknown plugin.

By: p01

p01 — Wed, 26 Nov 2008 19:17:14 +0000

RSarvas: Due to the compression algorithm GIFs aren't practical in JS, but BMPs are doable in realtime. See Neja, the JS demo I did in summer 2005. Most of it is done by generating 24bits BMP images on the fly ( Canvas wasn't exactly there yet ) and includes classic 2d effects, and a couple of 3D effects like perspective correct mapping with gouraud shading. As for sound, WAVE PCM is a straight forward format. I started a softSynth ~2 years ago. It's definitely doable. Not in realtime though.

By: RSarvas

RSarvas — Wed, 26 Nov 2008 15:50:31 +0000

It never occurred to me to try to embed data in URIs that would otherwise be in files. Wikipedia has some interesting info on the topic:

http://en.wikipedia.org/wiki/Data:_URI_scheme#Examples

Given the browser size restrictions on URIs it might not be partial for audio data but it does make me wonder what you could do with image data like GIFs that would fit into the size range. I’m wondering if this might be a nifty way to do JS palette shifting of images on-the-fly or even animated GIF creation from a series of stored frames.

[withdraws to code lair to test concept]

By: doublec

doublec — Wed, 26 Nov 2008 04:45:48 +0000

It’ll work fine with the tag too. Firefox nightlies have with WAV support if you want to test.

By: drewlesueur

drewlesueur — Wed, 26 Nov 2008 02:37:26 +0000

Excellent post.
I enjoy seeing things like this.

By: Schill

Schill — Tue, 25 Nov 2008 21:48:56 +0000

Javascript should be able to provide pretty much any format via data: URIs with QuickTime, etc. MIDI is one example, see this related discussion and demo video.

By: TNO

TNO — Tue, 25 Nov 2008 19:56:01 +0000

Yeah, you still need either Flash or Quicktime.No real breakthrough here.
.
Surely we haven’t forgotten about the tag?

By: jefposkanzer

jefposkanzer — Tue, 25 Nov 2008 18:07:39 +0000

Yeah, you still need either Flash or Quicktime. No real breakthrough here.

By: Nosredna

Nosredna — Tue, 25 Nov 2008 18:00:28 +0000

cnizz, if he had to lower the sample rate to get a sine wave working, I doubt mp3s make any sense at all (at this point in time).
.
I’ve done a few VSTi instruments, you need a lot of samples for high fidelity. Cut the number of samples and the noise floor rises dramatically.

By: cnizz

cnizz — Tue, 25 Nov 2008 16:42:13 +0000

What about mp3 files?

By: TNO

TNO — Tue, 25 Nov 2008 15:13:34 +0000

@Fyzbo. Its the mime-type
.
data:audio/wav;….”/>

By: Fyzbo

Fyzbo — Tue, 25 Nov 2008 14:50:11 +0000

It’s prompting for apple’s quicktime?