GCDS: Wrap-Up

A few things since last blog post:

• Met lots of people and didn't get stuck with the same group the entire time
• Got some work toward Amarok done (not as much, thanks to beer/people)
• Got to talk to Gnomies, civilized conversations

Obligatory pictures:

Picture of Nikolaj taking a picture of the city with a far better camera than mine.

Metal giraffe meets metal man-thing!  I don't know, this was near one of the parties and I thought it was weird enough to merit a photo.

"Taiwanese" restaurant, ended up going 3 times to mainly because it was cheap.  Ranks 4-6 on the 1-10 scale of delicious/price ratio for Chinese food.  The people working there were mainlanders, not Taiwanese.  Not what I'm used to, but amazing enough to find a Chinese restaurant on an island off the coast of Africa I guess.

Paid breathalyzer test!   You blow into a straw into this machine, and it tells you if you can drive or not.  Yeah...

Anyway, a good conference, read everyone else's long blogposts about things that happened and opinions on things and such.  That's all for this one.

ATTN: OWNER OF AN ONITY PASS CARD

I've found an Onity pass card that could be from a hotel or something, it says "Onity innovative thinking" on the front and has operating instructions on the back. If you have lost a card, please let me know.

Gran Canaria: A Few Photos

Words are boring, keeping it short:

• Good keynote speakers
• People misconstruing speech
• Overpriced food
• Coffee and Ice Cream
• Bad internet, no plugs
• Good discussions with cool people
• Same warm weather each day (twilight zone)
• People who speak odd/bad Spanish, and no English
• Having to translate for everyone due to the above

Vodka for breakfast anyone? For some reason the buffet here thought this was a good idea. I suppose the rich old Europeans might get impatient and need something to calm their nerves while their mountains of high-calorie food arrive.

It seems that a ~ is missing in a most unfortunate place. For those of you who don't know Spanish, this cake says something like "Happy anuses."

1/2 a kilo of ice cream for about 6 euros 50. Downed it between Leinir and me.

More to blog at some point when I have more words. This blogpost was a day in the making. That's how long it took to upload my photos without a timeout. Right then, bye for now!

GSoC: Boston/Cambridge Dev Sprint

The dev sprint was filled with conversation on all sorts of topics, open-source software and pop culture references, but above all, people got set up to go on their GSoC projects and got inspired by each others' enthusiasm.  This being my second time doing GSoC for the same project, I was already set to go and know my way around development, but this gave me a chance to meet with a fellow Amarok developer Jeff Mitchell, and now I've met a good amount of the core Amarok team, which is awesome.  In the end I didn't get a lot of actual coding done, but I took from the sprint enough inspiration to hurry up even more on the code I'm working on.

Highlights:

- MIT == We spent a good amount of time in one of MIT's buildings on our laptops (a photo on Marcus' blog).  Spent time on getting people set up on svn, setting up distributed compiling with IceCream and a bit of hacking.  Above all it set the pace for a lot of conversation which is really what the open source community is about: sharing ideas so that later on, you can work on making them real.

- OpenSuSE's IceCream == Not satisfied with the slow compiles of core stuff like Qt and our own huge projects, we tried to set up IceCream distributed compiler to get more bang for our byte.  Unfortunately we were doomed to failure (found out later) since some of us were 32-bit systems others 64-bit, and differeng GCC versions, and cross-compilers take too long to build.  However, we did get it somewhat going in the hotel, which was nice.

- JP Licks Ice Cream == In a word, amazing.  Suffolk County's own local chain, which redefines what a "small" ice cream should be.  I haven't seen so many unknown or strange flavors in a while, ranging from black raspberry, to peppered ice cream.  You definitely get your money's worth, but I had trouble even finishing the small.

- Indian Restaurant (don't recall the name) == More food than you could hope for, for the right price (the rest of Boston/Cambridge was quite pricy).  Had Chicken Tikka Masala (obligatory), Garlic Naan (also obligatory) and a ton of rice.  I should've gotten more spicy food but I wanted to play it safe.

- Star Trek @ IMAX == Nevermind why Reading has an IMAX theater in a furniture store, the movie was quite a visual spectacle.  The story/characters/acting was exactly what I expected, and I wasn't let down.  I'm sure Star Trek fans enjoyed it more since there seemed to be a lot of hidden humor, but luckily the few bits I've seen helped me out.

- Candlepin Bowling

== Unlike the 10-pin bowling I'm used to, here you get a ball the size of a skiball, pins aren't cleared until 3 shots, and the pins are cylinder-shaped.  Definitely interesting.

- The Kendall Hotel == Nice hotel, right in front of MIT, right next to the T.  Wireless was hassle-free, breakfast every morning.  Overpriced food can't be helped, but I went it cheap.  Nice beds and nice rooms, all that was needed for some late-night hacking.

- The T == The big pitfall of living in California is that the concept of mass public transportation is, to put it politely, lacking.  The Boston T, for about $2, will let you ride from one side of Boston to the other, and even to Cambridge and other outlying areas.  Reasonably fast, reliable, and not too packed.  Definitely one thing I would love to have here in car-driven California.

- Dunkin Donuts == There are ~300 of these in Boston alone, which is mind-boggling.  There's a DD underground in the T, there's one at Logan Airport, there's one in the MIT admin building!  Such cheap, decently-flavored iced cofee you will not find elsewhere, and the monstrous size of the large was worth the price.  Definitely went again and again...

- Dunkin Donuts == .... and again

- Dunkin Donuts == .... and again.  I got a lot of coffee in Boston.  I don't think I've ever had so much consecutive coffee drinking in my life.  Definitely missed on the west coast.

The People:

Veteran Devs:

Jeff Mitchell -- The guy who worked hard to make this all happen, and go well, and a fellow Amarok dev.  Many many thanks for making this possible, and for not getting too frustrated with my lack of brainpower in navigating directions and so forth this last weekend.

Marcus Hanwell -- Avogadro dev, soon to be working on our beloved build-system CMake.  Really cool guy, loves photography, well-travelled.

GSoC Students:

Chani Armitage -- Plasma dev, brought you screensaver plasmoids, now working on fancy popups using mouse buttons.  Energetic and very involved.

Constantin Berzan -- Working on a global outbox for Akonadi, to take away dependence on e-mail related things from KMail to free e.g. applets to do stuff with mail.  Good at directions, shame he had to go back so soon in the sprint.

Christopher Ing -- Bringing fluids to STEP.  Good roommate, made sure I didn't miss breakfast the 2nd day =)  The only mac user in the group, which shows the variety of people working on KDE-related things.

Ramon Zarazúa -- Working on refactoring support for KDevelop 4.  I really look forward to the results of this project, being an avid KDev 4 user.  Cool guy, the only one with whom icecream was working.

Adam Kidder -- Nepomuk search.  Picked up the slack for my lack of common sense this last weekend ("you need an IP address to run a dhcp server?").  At Ann Arbour, my cousin went there.

Marwan Hilmi -- Parsek.  Didn't get much of a chance to talk to him about his project, but seemed cool.  Note to self: round tables are only good if people aren't too far away from each other.

Pierre-Alexandre St-Jean -- Abstracting Kopete chat window for use in other apps.  Probably the only relaxed person of the bunch (most of the rest of us were doped up on caffeine).  

Conclusion:

Completely worth the 3,000 mile trip.  It looks like this GSoC, for KDE at least, will be filled with a lot of awesome people and work getting done.  These kinds of get-togethers help to motivate us to do awesome things, and to open up channels of communication between different parts of KDE which is essential to making KDE cohesive as well as feature-filled.  I don't think I'll be making it to Akademy this year unfortunately, so I'm happy I was able to make it to this.

I would, at some point, like to set up a similar event in California, perhaps in San Francisco or San Diego, and I wonder who would be interested in it.  

At any rate, good luck to all GSoC'ers on your projects, and I'll see you on IRC/ML.

Amarok: Quick Status Report on Refactoring, Git Rocks

Between the business of school &c. I've been at work making Media Device code smaller and easier to write, as promised. Here is a preview of the difference in the amount of code required before, and in my git branch after. Let's just look at the MediaDeviceCollectionFactory subclass for Ipods, which keeps track of Ipods connected and talks to Solid.

Before:

AMAROK_EXPORT_PLUGIN( IpodCollectionFactory )

IpodCollectionFactory::IpodCollectionFactory()
: Amarok::CollectionFactory()
{
//nothing to do
}

IpodCollectionFactory::~IpodCollectionFactory()
{
DEBUG_BLOCK
}

void
IpodCollectionFactory::init()
{
DEBUG_BLOCK

// connect to the monitor

// connect( this, SIGNAL( ipodDetected( const MediaDeviceInfo & ) ),
// MediaDeviceMonitor::instance(), SIGNAL( deviceDetected( const MediaDeviceInfo & ) ) );

connect( MediaDeviceMonitor::instance(), SIGNAL( ipodReadyToConnect( const QString &, const QString & ) ),
SLOT( ipodDetected( const QString &, const QString & ) ) );

// HACK: emitting old signal to avoid refactoring applet yet
connect( this, SIGNAL( tellIpodDetected( const QString &, const QString & ) ),
MediaDeviceMonitor::instance(), SIGNAL( ipodDetected( const QString &, const QString & ) ) );

connect( MediaDeviceMonitor::instance(), SIGNAL( ipodReadyToDisconnect( const QString & ) ),
SLOT( deviceRemoved( const QString & ) ) );

connect( MediaDeviceMonitor::instance(), SIGNAL( deviceRemoved( const QString & ) ), SLOT( deviceRemoved( const QString & ) ) );

// HACK: Usability: Force auto-connection of device upon detection
checkDevicesForIpod();
}

void
IpodCollectionFactory::ipodDetected( const QString &mountPoint, const QString &udi )
{
DEBUG_BLOCK
IpodCollection* coll = 0;
if( !m_collectionMap.contains( udi ) )
{
debug() << "New Ipod not seen before";
coll = new IpodCollection( mountPoint, udi );
if( coll )
{
// TODO: connect to MediaDeviceMonitor signals
connect( coll, SIGNAL( collectionDisconnected( const QString &) ),
this, SLOT( slotCollectionDisconnected( const QString & ) ) );
m_collectionMap.insert( udi, coll );
emit newCollection( coll );
debug() << "emitting new ipod collection";
}
}
}

void
IpodCollectionFactory::deviceRemoved( const QString &udi )
{
DEBUG_BLOCK
if( m_collectionMap.contains( udi ) )
{
IpodCollection* coll = m_collectionMap[ udi ];
if( coll )
{
m_collectionMap.remove( udi ); // remove from map
coll->deviceRemoved(); //collection will be deleted by collectionmanager
}
else
warning() << "collection already null";
}
else
warning() << "removing non-existent device";

return;
}

void
IpodCollectionFactory::slotCollectionDisconnected( const QString & udi)
{
m_collectionMap.remove( udi ); // remove from map
}

void
IpodCollectionFactory::slotCollectionReady()
{
DEBUG_BLOCK
IpodCollection *collection = dynamic_cast( sender() );
if( collection )
{
debug() << "emitting ipod collection newcollection";
emit newCollection( collection );
}
}

void
IpodCollectionFactory::checkDevicesForIpod()
{
QStringList udiList = MediaDeviceMonitor::instance()->getDevices();

/* poll udi list for supported devices */
foreach( const QString &udi, udiList )
{
/* if ipod device found, emit signal */
if( isIpod( udi ) )
{
// HACK: Usability: Force auto-connection of device upon detection
QString mountpoint = MediaDeviceCache::instance()->volumeMountPoint(udi);
ipodDetected( mountpoint, udi );

//MediaDeviceInfo *deviceinfo =
new IpodDeviceInfo( mountpoint, udi );
//emit ipodDetected( deviceinfo );
// HACK: emit old signal to avoid refactor of applet yet
emit tellIpodDetected( mountpoint, udi );
}
}
}

bool
IpodCollectionFactory::isIpod( const QString &udi ) const
{
DEBUG_BLOCK

Solid::Device device;

device = Solid::Device(udi);
/* going until we reach a vendor, e.g. Apple */
while ( device.isValid() && device.vendor().isEmpty() )
{
device = Solid::Device( device.parentUdi() );
}

debug() << "Device udi: " << udi;
debug() << "Device name: " <<>deviceName(udi);
debug() << "Mount point: " <<>volumeMountPoint(udi);
if ( device.isValid() )
{
debug() << "vendor: " << device.vendor() << ", product: " << device.product();
}

/* if iPod found, return true */
return device.product() == "iPod";
}

After:

AMAROK_EXPORT_PLUGIN( IpodCollectionFactory )

IpodCollectionFactory::IpodCollectionFactory()
: MediaDeviceCollectionFactory ( new IpodConnectionAssistant() )
{
//nothing to do
}

IpodCollectionFactory::~IpodCollectionFactory()
{
DEBUG_BLOCK
}

----------------------------------------------------------------------------------------------

As you can see (excuse the bad formatting, blogger doesn't take kindly to source code), the amount of code required has been greatly reduced, and the other required classes are soon to follow. Also, things are going to be implemented more in the predictably correct classes now, and after refactoring is done and I've ported both Ipods and MTPs to it, I will write a small tutorial on how to go about implementing your own device. No, UMS will be done by me, heh, but it should be a piece of cake afterward to implement support for some of the other devices some of you miss from Amarok 1.4, so yay!

Unfortunately I'm fairly busy with school too so this proceeds in big bumps every 4-7 days, might take a bit, but getting there. I'm going to Boston next weekend for the KDE GSoC meetup, which should be fun. If you're around, do say hello!

Amarok: A Better Media Device Experience, GSoC 2009

So I have again the pleasure of being selected for Google's Summer of Code for Amarok to scratch some very serious itches concerning media device support in Amarok 2.

Itches:

• Playlist Support
• More GUI Feedback, more intuitive interface
• UMS(Universal Mass Storage) Support

Playlist:

Actually, iPods in Amarok already have their playlists read on connect, but at the time I wrote the code, the code in Amarok for any collection dealing with playlists wasn't at a satisfactory level yet, which I believe it to be now thanks to the work of a few people, in particular I know that Stecchino (Bart) has worked on it.

GUI:

The media devices applet seemed like a good idea at first, but it's terrible from a usability standpoint, and since the PUD (Popup Dropper) removes any possibility of dragging-and-dropping tracks onto it, for instance, it doesn't make much sense to have it.  However, I understand there's plans in the works to redo some of Amarok's GUI, part of which will accomodate the previous functions of this applet, and I'll be taking advantage of that.

UMS Support:

Yes!  I swear it this time.  It turned out that building a new collection-based media devices infrastructure more-or-less from scratch took a lot longer than planned last summer, and I did not get to UMS.  Another reason I've held back on it up until now is that media device support in general is going to get a massive refactoring before GSoC begins, to accomodate for simple adding of support not only of UMS devices, but in the future, other types as well.

Ok, now that the explanations of GSoC are out of the way, I move on to something else.

People with media devices, aside from the above, what is it you would like to see in Amarok for devices?  I can list a few off the top of my head, please list more so that I can prioritize perhaps some time for this summer and beyond.

• MTP Cover Support
• iPod stale/orphaned scan support
• Playlist synching with the local collection

OpenSolaris, Qt and Game Development

Overview

A group of 3 other people and myself were charged with making a game for a class this trimester, which is essentially a Final Fantasy clone with a few quirks localized to our university. In thinking of a toolkit, I thought to myself "what event-driven toolkit provides a graphics system and paint system complete and robust enough to make this happen?" Naturally Qt came to mind. The professor suggested some Java toolkits, including SWT, but my experiences with SWT have not been at all good, so I decided to give Qt a shot. Another perk of Qt over SWT is how easy it is to learn and use, since my 3 team members are not familiar with it.

After a few days of playing with Qt tutorials on the Graphics framework and studying KDE games code, I had a small but working prototype of one of the modes of our game, where the character explores the scene of a level.




Things to notice that were easy to do:

- Creating a graphics item from a graphic file
- Moving it around
- Having it change form
- Collision detection with walls
- Dragging of the view to see different parts of the scene

Deployment

Before proceeding I had to make sure that the program would run on the target platform of the school servers: SunOS 5.10 (Solaris). Now Qt is a cross-platform toolkit, and binary builds of it are provided for Linux, OS X, and Windows, but not for Solaris (that I could find here).

Having recently installed VirtualBox after hearing lots of good things about it, I decided to give Solaris a spin as a virtual machine. There was a bit of confusion for me at the beginning with so many possible distros to choose from, but luckily since only 2 of them are supported by the KDE Solaris team, that narrowed it down. They prefer using SXCE, so I gave that a shot, but unfortunately some bug where X would show up but then freeze on the live dvd stopped me short (I figured it was an issue of running in a VM or something). Then I tried OpenSolaris 2008.11, which installed fine

Then the problem became that the instructions on the wiki for compiling using OpenSolaris were a bit lacking, a problem I have since mended with some updates based on my experience. After much strife with getting the environment set up just right, compiling was not a big deal, thanks to the awesome efforts of the KDE OpenSolaris team. I ran into some issue with a Qt example not compiling, and hacked it up to fix it, since it didn't much matter, and voila, Qt was on the system, and my previous example in the youtube video worked.

From here, I had a few options (as I saw it):
- build Qt as static, deploy a static binary
- build Qt as shared library, ask school admins to install Qt on servers
- build QtJambi, port to Java, deploy as jar

Since building Qt as static was not supported by the KDE Solaris team, I decided to give QtJambi a shot, and ported my example to Java. Unfortunately the QtJambi build specfile provided didn't work too well, and went into an infinite recursive make loop.

When at last I had almost given up, I discovered that the shared library approach doesn't actually require the system to have Qt installed on it, just that the necessary .so shared object files be deployed with the program itself, and to use a script to launch the program (a script which simply adds current directory to linker path).

A simple ldd resulted in this:

libc.so.1 => /usr/lib/libc.so.1
libQtGui.so.4 => /opt/foss/qt4/lib/libQtGui.so.4
libQtCore.so.4 => /opt/foss/qt4/lib/libQtCore.so.4
libCrun.so.1 => /usr/lib/libCrun.so.1
libm.so.2 => /usr/lib/libm.so.2
libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0
libpng12.so.0 => /usr/lib/libpng12.so.0
libSM.so.6 => /usr/lib/libSM.so.6
libICE.so.6 => /usr/lib/libICE.so.6
libz.so.1 => /usr/lib/libz.so.1
libXrender.so.1 => /usr/lib/libXrender.so.1
libXrandr.so.2 => /usr/lib/libXrandr.so.2
libXfixes.so.1 => /usr/lib/libXfixes.so.1
libXcursor.so.1 => /usr/lib/libXcursor.so.1
libXinerama.so.1 => /usr/lib/libXinerama.so.1
libfreetype.so.6 => /usr/lib/libfreetype.so.6
libfontconfig.so.1 => /usr/lib/libfontconfig.so.1
libXext.so.0 => /usr/lib/libXext.so.0
libX11.so.4 => /usr/lib/libX11.so.4
libgthread-2.0.so.0 => /usr/lib/libgthread-2.0.so.0
libnsl.so.1 => /lib/libnsl.so.1
libsocket.so.1 => /lib/libsocket.so.1
libexpat.so.1 => /usr/lib/libexpat.so.1
libXau.so.6 => /usr/X11/lib/libXau.so.6
libpthread.so.1 => /lib/libpthread.so.1
libmp.so.2 => /lib/libmp.so.2
libmd.so.1 => /lib/libmd.so.1
libscf.so.1 => /lib/libscf.so.1
libuutil.so.1 => /lib/libuutil.so.1
libgen.so.1 => /lib/libgen.so.1
libXevie.so.1 => /usr/X11/lib/libXevie.so.1
libXss.so.1 => /usr/X11/lib/libXss.so.1

Wow, that's a lot of shared objects! According to the Qt deployment guide though, all of the X libraries could and should be avoided to be packaged. I did end up adding other ones though, one by one, as I saw necessary until the program finally ran without a linker error. The bad news is this blew the total package up to 30 MB or so. Oh well, so be it, it ran!

And now...?

And now the real development can begin. There's only a few weeks to work on it, but that should be plenty. It won't be a terribly fantastic game as a result, but it was an interesting adventure, and more importantly proves the point that Qt is an awesome toolkit, and that there are quite a few options open for deployment.

Thanks to the KDE Solaris team for helping me with getting things building, I'd be nowhere without your help (in particular: szt, [ade], steleman, and trochej thanks a lot guys).