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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

Last 100 entries

NYT Has More Details; Obvious Question; Advertising Low Cost Routes?; Similar Analysis Here; My Current Take On Surveillance Scandal; Last.fm is Hiring; How I Am 2; The back-wards compatibility fallacy; Wiggle The Mouse To Pass The Test; Python Enums on Crack, Part II; Multiple Monitors with Linux; What Is Happening In Turkey; A Simpler Enum; John Fogerty on IAmA; And You May Well Ask...; Progress on a Better Enum; I'm a MACHIIIIIIIIIIIIIIINE; Those little tab things on the side of jet engines; Re: Python's sad, unimaginative Enum; Some explanation; Printing binary trees sideways; About "Python's sad, unimaginative Enum"; Atoms in python; Some good feedback here; Frustration Understood; I agree with you #nt; What would be imaginative?; Re: Enum; this is fucking useless; Enum; Python's sad, unimaginative Enum; Possible Fix; Work, Exhaustion, Vacation; VirtualBox with Centos 6.3 to 6.4, client; Matasano - Programming Lessons Learned; PDF to HTML; Alternate Substitution; Why RSA Works; Trigger; Dreaming of Death; Example: Tracing; Using Coroutines In Protocol Simulations; Python 3.3 Only; Pure Python SHA1 and MD4 Implementations; Ubuntu on VirtualBox; Starting TOR as a service on OpenSuse 12.3; 1001 Albums; Using fail2ban on OpenSuse 12.3; PPPoE on OpenSuse 12.3; Good Article on Unified Physics; It's Police (Carabineros); Linux Software for Listening to and Exploring Music; Android is Pretty Bad; Lucky Number; 3D Printing for Casting; Cover Art for MPDroid; Who'd a thought the French were so bigoted?; PS Input Signal; Small Problem with Roksan K2 Amp; Roksan K2 Amp + ATC SCM7 Speakers; Do What Makes Sense; Re: Arguing About Tests, Still; Arguing About Tests, Still; Images; Good Article on NY Drummers; Related Bug Report; Getting Python 3.3 and Virtualenv Working in OpenSuse 12.3; How I Am; Awesome video about digital audio; The Difference Between Dimensional and Normalized Databases; The rise of the new Chinese bogeyman; Updated Syntax; Very First Steps to C-ORM; The Ideal User Interface For Music Exploration; Can The Republicans Be Saved?; Rate Limiting Calls to EchoNest; Mods to Cache; Comparing UYKFG and UYKFD/E/F; Someone Else is Concerned; EchoNest-based Playlist Generator for MPD; Example Voting Results; A Heavyweight Python Cache; Identifying Artists with EchoNest; Notes on Pregalex / Pregabalina / Lyrica; The Neil Cowley Trio; Drake - Make for Data; A Reliable Python Web Service; Useful Python Date/Time Library?; Need to Sleep, But this is Good; Command Line Set Difference; Little Details...; Linux Command Line Tricks; AutoTools Tutorial; Hangman Tactics; A Tor Proxy Embedded In A Web Page; Tree (Nested Dicts) in Python; Sleeping at Parties; I Know Someone Who Hurts Other People; Light and Tea; Description of the LCS35 Time Capsule Crypto-Puzzle; Re: I can relate to that ...

© 2006-2013 Andrew Cooke (site) / post authors (content).

It's Official - I Rock

From: "andrew cooke" <andrew@...>

Date: Sat, 30 Jun 2007 23:25:11 -0400 (CLT)

Yay for me!  My Airport Express just answered.

Sun have a bug in their fucking crypto library.

Bouncy castle rock even more than me.

A Java/Jack port of JustePort coming soon to a computer near you...

Andrew

Sine!

From: "andrew cooke" <andrew@...>

Date: Mon, 2 Jul 2007 21:58:46 -0400 (CLT)

Spent some time playing with this after work today and just got a sine
wave out of the speakers.  Woot!

(This has been a "learning experience".  Spent way too long trying to
compare my output with JustePort for a known RSA key.  If that seems
reasonable to you, too, then you don't understand Optimal Asymmetric
Encryption Padding either, fool! :o)

Andrew

I Am A Foooool..

From: "andrew cooke" <andrew@...>

Date: Sun, 8 Jul 2007 18:12:54 -0400 (CLT)

The noise, it is not good.  Zeroes give silence, and fake sines sounded
like they were fake sines (at least, the frequency sounded to drop when I
doubled the period), but looking at the output from the Airport via my
oscilloscope it's clear that I have something very wrong indeed.

Channel separation is OK (despite not sounding that great through
headphones) - am now worried about the rest of my hifi, but that can wait.
 But fidelity is not.  Looking again at the code I think I may need to
reverse my endianness...  I guess swapping byte order is not enough, those
bits are important too, huh?

Andrew

More of a Wobble

From: "andrew cooke" <andrew@...>

Date: Sun, 8 Jul 2007 19:31:35 -0400 (CLT)

OK, so the prev comment makes no sense.

I now have beautiful sine waves.  The problem?  It really isn't an 8-bit
aligned data stream.  There really is a 23 bit header!  Hence the random
noise that kept appearing.

Still, the good news (apart from the damn thing working - I guess I should
be able to pipe music through it now) is that uncompressed ALAC really
does just interleave channels.  No sum/difference.

I guess I should try putting music through...

OK, so music doesn't work - I guess that's the Jack side of things.  But a
sine wave sounds smooth.  Maybe I should just start listening to sine
waves.

Andrew

Woot - Jack to Airport

From: "andrew cooke" <andrew@...>

Date: Mon, 9 Jul 2007 21:53:13 -0400 (CLT)

Credence, of all things (hey, it was just the first directory I found with
some ogg files) is now coming out of my speakers...  Yep - I now have a
Jack client that talks to Airport Express! :o)

Three things to do now:
1 - Clean things up and package them for a 0.0 release
2 - Work on improving sound quality
3 - Work on improving streaming quality

(2) includes fixing some ugliness in the code that is losing data (I'm not
sure if the noise I'm hearing at the moment is the original recording or
not).

(3) means worrying about the difference in clock rates between the airport
and jack.  Also, discovery of the IP address would be nice.

All this should be fairly easy (within reason - I have no magic solution
for synchronizing clocks, for example) now that the the basics work.

I guess I should pack away my ancient (HP, valve, older than me)
oscilloscope too...

Andrew

jjjuste V 1.0 Released

From: "andrew cooke" <andrew@...>

Date: Wed, 11 Jul 2007 21:22:46 -0400 (CLT)

I just released an Airport Express client for Jack:
http://www.acooke.org/jara/jjjuste/

Andrew

This project died soon after...

From: "andrew cooke" <andrew@...>

Date: Thu, 25 Dec 2008 17:48:57 -0300 (CLST)

The streaming was never very reliable, and it was a lot of fuss.

For what to do instead, see comments here:
http://www.acooke.org/cute/AirportExp0.html#Tue23Dec20080954590300CLST

Andrew

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