Entries Tagged 'General' ↓

It’s done. Swfdec
0.4.3 is out, so for everyone that couldn’t or didn’t
want to dig into the dirty world of unreleased code, grab
the releases of Swfdec
and Swfdec-Mozilla.
It will probably take a while before this hits the big
distributions, since there’s legal issues with the video
plugins and Debian and Ubuntu are still busy releasing.

For this release I’ve done all the easy tasks in Youtube
playback, so you can play/pause, rewind and watch the slider
on the seek bar. You still can’t seek or change the volume,
but that has to wait. But you can right-click, select
Properties and save the video you’re watching. So there, a
feature that’s not in the official player.

A big thanks to all the people who’ve encouraged me, filed
bugs or submitted patches, wrote articles or blog posts
about swfdec and otherwise kept me busy for the last week.
It’s been an interesting experience although I still think I
suck at marketing and public relations. Somehow Christian
does a much better job pimping my stuff.

The only thing I’ve figured out is that even though lots of
people are interested in Flash in many different forms,
there’s a very small amount of people actually hacking on
making Free Flash a reality. Even though the technologies
used in Flash are what everyone wants. I wonder why that is?

So here’s a small update to last week’s Swfdec
Youtube post. I’ve spent most of the time on the awesome
IRC feedback that I got. Thanks everyone. Here’s some
answers to the most common questions I got:

Swfdec plays Youtube. Now what does that
mean?
It means that when you grab the Swfdec library and the
swfdec-mozilla package out of git and manage to install it
correctly, you will be able to go to any Youtube video site
and have it play back the videos in your browser. The
buttons don’t work yet and it certainly doesn’t behave 100%
like the Adobe plugin, but it certainly plays the videos.

OMG, swfdec doesn’t work on 64bit machines!
OMG, it does! Since I posted the last entry, I’ve got lots
of offers for remote access to 64bit machines and spent the
last hours making sure it compiles and passes the testsuite.
Of course I have no 64bit machine and until 3 hours ago
didn’t know most of the things I’d need to look for, so
expect some bugs being left. Please test if you’re on 64bit
and if you find crashers, file bugs.

Where’s the release?
I intend to do a release soon, but I’d like to have a
working pause button and slider in Youtube. I’m hoping for a
release at the end of this week. For now, use git.

How close is Swfdec to being a complete Adobe Flash
replacement
That really depends on your definition of close. For the
definition “implements all of Flash’s features” it’ll
probably not hit 5%. For the definition of “plays all the
Flash files on the Web” I think it’s 80/20 right now. Swfdec
plays 80% of the ads and 20% of the real content. And no,
that wasn’t on purpose. I’ve been following a simple rule
for what to implement: I take an interesting flash file and
make it work correctly. So if there’s any Flash files that I
might find interesting and that you want to have working in
Swfdec, don’t hesitate to contact me with URLs to those
files. I’m always looking for cool Flash files.

What can be expected from Swfdec in the
future?
I have no idea. I’m looking for a job at the moment and
since that job will most likely not be me hacking on Swfdec
fulltime, expect the Swfdec development to slow down in the
future. However, it only took me half a year to get Youtube
working and Youtube is already quite complicated. So in
short: I have no idea.

YOOOUUUUUTUUUUUBE

GO Swfdec!

6 months of work, I’m now gonna go partying.
See you at Cebit.
PS: For the brave people: The code is in git.

Miguel
links to a
blog post by Anne Zelenka (read the comments!) about how
open Flash is and how good an open Flash would be. I think
one point they all don’t see in their “an open spec would be
enough” is the work necessary to produce an open spec.

Now let me get this straight. Adobe has a spec for the SWF
format, and they have lots of documentation on Actionscript,
so producing some spec would be easy. But the problem is
that the existing specs only describe correct behavior, but
not the more important part on how to treat errors. Consider
an example where the spec might say something like “height:
Integer – the height of the current movie”. So what happens
when your code does height = new Object()? It’s written
down nowhere. In the current closed world, the solution is
easy: the accepted behavior is what the Adobe Flash player
does. So if you want to write an open Flash Player like Swfdec, you don’t
need a spec, you need patience and lots of test cases.
Because there’ll surely be a Flash somewhere that does
height = new Object () or height
= height / 0 or height = "Hello World" or…

A good example of how hard it is to handle the unexpected
right is Acid2
for CSS. And in the case of Acid2, there even exists a spec
about how to handle all the errors. (I was going to link to
something I read by I think Håkon Lie about why having a
defined way of handling errors is important as opposed to
just aborting, but I can’t find it in Google.) And error
handling mechanisms are an important part of an
implementation. The
Mozilla team needed 1.5 years to correct their error
handling. So if you figure out something new and exciting
about Flash, it can easily mean you have to redesign a large
part of your player. So it’s important to know beforehand
and should be part of the spec.

And while we’re talking about necessary rewrites: A part
that no spec talks about is implementation complexity. If a
function is O(1) in the official player while it is O(N) in
yours, you have a problem when someone calls it excessively
in a loop. And then there’s probably code relying on
timeouts, data input or the phase of the moon.

Another thing I’ve been wondering about lately is the
complexity of implementing a standard. I have no clue how
Flash relates to SVG in complexity, but SVG has an open spec
and that one is 4 years old. Do we have any SVG compliant
implementations by now? HTML has a free spec, too. It took
the Mozilla team 6 years from open
sourcing to a
release for their browser. So if a complete Free
Flash specification started to exist tomorrow, would it take
5 years to implement?

An open Flash spec would definitely make Flash inch closer
to World Domination, but it’d still take a very long time to
make it really Free. Open sourcing the player would probably
make that happen way faster.

I did it

So I’ve just managed to finish my Christmas present
only a week late, but anyway, after 3 months of not hacking
on anything else, I’ve finally released Swfdec
0.4 and its companion, Swfdec
Mozilla 0.4.

The good news: The mozilla plugin is now almost 100%
compatible with South Park Studio. So you can do
this.
(Yes, that’s an SVG taken from the Flash)
Unfortunately there’s no UI for it yet. Implementing Flash
is kind of a huge task afterall.

And finally, here’s the disclaimer: This software is not
rock-solid. So if the plugin kills your browser, don’t blame
me. File a bug or
talk to
the list instead.

Happy new year!

So, talking about the MS/Novell deal has been declared
stupid by dobey
even though according to other hackers 80 percent of hackers
think that there is nothing wrong with it. jclinton
has issued a statement condemning this action. Perhaps he
said it best

“Since you guys are all buddy, buddy
and everything, I’m sure it wouldn’t be too hard for you to
take a few minutes of his time to explain the spirit of Free
Software to Steve.”

Personally I think that if
people weren’t outraged about it, we’d have already lost to
MS.

Update: Iain
has
said that if more people think like this he will do what he
is told and stop blogging completely.

Flash

So about a month ago Federico blogged a Youtube link again.
That made me wonder about Free Flash decoders and I had a
look around. In the end I started hacking on David‘s Swfdec, since it
has all the goodies: Cairo for beautiful
Graphics, GStreamer for
sound, David’s excellent code (the SWF parsing code is
awesome) and of course it was written in Gnome C.

Long story short: I haven’t had this much fun in hacking for
ages. I think I haven’t done much else in the past month but
hacked on Swfdec and watched lots of stupid Flash movies
lots of times.

So what’s the current state? It’s still very far from
finished since Flash is huge. It’s a graphics framework
(think GDK) with a scripting engine (think Javascript). But
if you’re adventurous, bored or both, feel free to check out
the sources from git://people.freedesktop.org/~company/git/swfdec
and play with them. They might even play back some
weird flash file. For now I’ll continue to make FLash
files work one by one. Next stop: South Park.

PS: Before someone asks: Gnash is low quality, written in
C++ with Boost, requires Copyright assignment, svn doesn’t
even compile and it does less than my current Swfdec, so I
didn’t hack on it.

Selection Fun

Do you know this: You select some text with the mouse and after you did this you wonder why you missed the last or the first letter?
I asked some people around me and they have that problem. Today I got annoyed enough to venture into the deep world of selecting text to figure out what the reason for this could be.

So I started my journey by looking into the GtkEntry source code. And the first thing I found where two things I didn’t know. The first is a workaround for this problem: You can shift-click to extend the selection.
The second: If you start selecting with a double-click (triple-click), you’ll only select full words (lines).

And I found out what the problem is: When selecting text, you don’t select letters, you select gaps. What does that mean? If you click on a letter, Gtk selects the closest gap for you. So if you click on the left half of the letter, the gap in front of the letter is taken, if you click on the right half, the gap on the right is taken. If you want to try: The best letter is an “m”, at least with Vera. So, go, enter “mmmmm” in your location bar and try it. :)

This seemed like an obvious usability issue to me, so I thought that other toolkits would get it right. And then I found – for the first time ever – that everyone: Gtk, Qt, XUL, Gecko and Windows, they all behave the same. This got me thinking: Are you actually supposed to select gaps? I mean, it’s very likely that I am wrong and the rest of the world is right and not vice versa. But actually, all the people I asked said they knew that problem.

So I’m currently a little lost. Should I really file bugs with literally everyone or did I miss something? I’ve filed a bug with Gtk, but I’m wondering if I it’s really wrong and I should file bugs with Qt, Mozilla, Abiword, …?!

I need to follow up on David’s Post about Foundation membership because it fits so well:

As much as it is a nice feeling to feel welcome when you’ve got your confirmation email, it’s a weird feeling when you get the email that you will be no longer a member now, because you didn’t do the work to renew it, even though you’re still very involved with GNOME.
This is the only reason why I am no longer a foundation member.

Who let this crap into Gtk? I’m really annoyed that such code ended up there, because that code not only works bad, but also is conceptual crap. I’m talking about the dnd code. So what’s wrong with it? I’ll start with the worst things:

1. You have to provide a function that creates a new window if the tab is dragged off the notebook. So what’s wrong with gtk_notebook_set_window_creation_hook? It’s global. Every self-respecting programmer should know by now that globals are bad, mkay? Especially so in libraries. Anyone remember XSetErrorHandler? So just assume for a moment, that you were using a docking library (like the Gimp or Gdl) that wants to support floating docks and you want to make some of your own notebooks detachable. Who sets the hook?
2. To figure out if dragging from one notebook to another is allowed, one has to set a group id. And this is a (positive) integer. Hi namespace collision. By now I’d thought that it was common knowledge to use strings or pointers for such a thing. But apparently it’s not. So what ID is the docking library using now? Just pick one and hope?
3. Detaching tabs only works if you drag them to the desktop. Don’t ever try this with a fullscreen app.
4. Reordering is implemented without drag’n’drop to give nice visual feedback. Unfortunately detaching is implemented with drag’n’drop. So once you’ve gone over the threshold to start a drag, the UI looks completely different. Even if you later on move the mouse over the notebook again, it doesn’t change back.
5. There is absolutely no visual feedback (aka highlighting) when doing a drag.
6. The code for reordering (or dragging) tabs in a small notebook (where the arrows are visible and preferrably only one notebook is visual at any time) does not work in any reliable way.
7. There are lots of different annoying drawing glitches from flickering to drawing tabs in weird places during reordering and dragging.

These are lots of reasons that would have gotten me patches rejected almost everywhere in the gnome stack. So why did the normally excellent Gtk quality control fail to work in the notebook case?