grh.mur.at - gem

How to become a Pure Data / GEM Professional

grh — Sun, 20 Jun 2010 18:31:49 +0000

These are materials from a lecture about realtime audio and video programming (using GEM and Pure Data) at the University of Applied Science, FH Joanneum, for the master programme Media and Interaction Design.

VideoIO

grh — Wed, 24 Jun 2009 15:23:31 +0000

Short Description:

general video IO framework for Pure Data

Started in:

2007

Authors:

Thomas Holzmann

Authors:

Georg Holzmann

License:

GNU General Public License (GPL)

Programming language:

C, C++

Overview:

This framework should provide a general video input and output system (reading/writing various files and from/to devices) for Pure Data. The interface is platform independent and the needed libraries are checked and loaded at runtime, so the host application (e.g. Gem, Gridflow, PDP) has no compile time dependency on all those video libraries.

At the moment only the interface to Gem is implemented and consists of the following objects: pix_file_read, pix_file_write and pix_devic_read. They use the gstreamer plugins for all these opterations, but alternative libraries, especially on Windows and OSX, should be added in future.

What they can do ATM:

pix_file_read: reading audio and video from all formats gstreamer supports (quite a lot), reading from dvd, http, mms, udp streams, ...
pix_file_write: writes in some codecs to disk, also streams over udp
pix_device_read: can read from camera and DV devices

This project was part of the Google Summer of Code program 2007.
The latest source can be downloaded from the SVN repository, an other (maybe outdated) version can be found in the download section below.

Version Control System URL:

VideoIO SVN repository

Release Tarball:

VideoIO source and documentation

pix to pdp bridge

grh — Wed, 24 Jun 2009 14:14:26 +0000

Short Description:

conversion object between GEM and PDP

Started in:

2005

Authors:

Georg Holzmann

License:

GNU General Public License (GPL)

Programming language:

C, C++

Overview:

Two main video processing frameworks exist for Pure data: Gem and PDP.

pix_2pdp captures the contents of a Gem pix object and transforms it to a PDP packet (use colorspace YUV for the fastest conversion).
So it's possible to convert from Gem to PDP to Gem to PDP to ...

What can you do with it?

use pix_video/pix_2pdp for firewire input in PDP
use pix_2pdp/pdp_rec~ to record Gem pixes
maybe switch between Gem and PDP all the time
...

pix_2pdp is based on code of gem2pdp by Yves Degoyon and is a part of the gem2pdp package.
Many thanks to IOhannes M Zmoelnig for support!

Implemented colorspaces: RGB, RGBA, YUV, Grey.
For more information how to use it look at the help patch.

Version Control System URL:

SVN repository of the gem2pdp project