[Delta] Re: [Jabber-dev] Psi/Jabber/Helix Status
damonlan at real.com
Tue Sep 7 10:48:09 PDT 2004
The server does have a plugin SDK. What specific functionality are you
looking to export from the server?
On Sep 7, 2004, at 3:32 AM, Justin Karneges wrote:
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> Hello everyone,
> I've finally moved most of my Helix code into the Psi CVS. It is
> but from this point on it will be publically available. The only part
> haven't yet committed is the RTSP handshaking code for Iris. I'll
> commit it
> when I'm sure it won't break Psi CVS. :)
> There are two major parts to this project:
> - Media I/O
> - Bridging over Jabber.
> The latter is actually the more difficult component, which is what I
> spent most of my time with, so I'll talk about it first. I've
> designed a
> specification for routing RTSP over Jabber, which is available in the
> form of
> two JEPs (jep-rtsp and jep-media) at the Delta website. They depend
> on an
> update to JEP-0065 that I also wrote, which allows the routing of UDP
> between Jabber endpoints (this spec update can be found in the
> jabber.org CVS
> for -65, but has not yet been published). Codewise, Iris JEP-65 now
> has UDP
> support, and cutestuff/rtsp contains the tunnelling proxy code.
> this tunnels RTSP over JEP-65, which is absolutely necessary in the
> world of
> NAT that we live in.
> For media input/output, the Helix SDK is used. Helix is relatively
> easy to
> work with, and the only snags involve the binary-only files (well, and
> major SDK oversight regarding the server, see below). I've abstracted
> Helix library into a very simple Qt-based media API. Video is played
> onto a
> QWidget. All of this is wrapped up as a plugin, meaning that there is
> direct dependency on Helix to compile or run a program that uses the
> API. The rationale for this is to allow Psi to be distributed without
> support and have it easily added at a later time. The media code is
> found in
> a new top-level CVS module, 'media', and the 'helix' subdirectory
> the plugin that actually links to the Helix SDK.
> For the adventurous of you out there, you might want to toy with
> Testplay is a super simple media player in ~150 lines of code. It
> everyone and their dog has a media player now. :) So far I've only
> tried it
> on X11, but the code _should_ be portable to Windows and Mac.
> First step is to read the Helix website and learn how to build splay
> from the
> Helix CVS using ribosome. This should cause all of the needed
> libraries to
> be built also, and then you just point some paths to the splay build
> directory. See media/README for details.
> Binary-only snags:
> - Some Helix files are not open source. Most of these we don't need
> for our
> project anyway, although I've recently discovered that the audio/video
> capture driver is closed source and the binary-released version is
> incompatible with the latest CVS code.
> - To play the Tori Amos video that testplay refers to, you'll need
> RealVideo codec. To get access to this, you probably have to register
> some webforms on the Helix website.
> What remains to be done:
> - Finish jep-rtsp and jep-media in Iris.
> - Get a working and legally usable capture driver.
> - Finish producer (read: media input) integration. I've only
> started this, as without capture I couldn't get very far.
> - Serve media. It's kinda sad that I don't have this yet, as it is
> important. However, I'm not yet sure how to approach the task as there
> doesn't appear to be a server SDK at all. I've asked about this on
> the helix
> lists several times already. Maybe I have to fork the Helix Server
> We could be in over our heads here.
> - Psi GUI (I'm the least worried about this, it's a 1-2 day thing,
> I'll just
> steal from the File Transfer stuff).
> The short story: lots of work done, but not quite there yet. When
> will this
> be complete? Hard to say. Finishing within the month of September
> could be
> realistic, provided that there are easy answers to the pending
> producer/server issues.
> - -Justin
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