From c3f5ea53917dea9c80751ee5809c7455589888be Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Thu, 15 Dec 2005 07:41:49 +0000 Subject: oops, mixed a few svn path=/trunk/externals/pdp/; revision=4218 --- doc/misc/overview.html | 102 ------------------------------------------------- 1 file changed, 102 deletions(-) delete mode 100644 doc/misc/overview.html (limited to 'doc/misc/overview.html') diff --git a/doc/misc/overview.html b/doc/misc/overview.html deleted file mode 100644 index 6eb0e70..0000000 --- a/doc/misc/overview.html +++ /dev/null @@ -1,102 +0,0 @@ - -Pure Data Packet - - -

Pure Data Packet

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Introduction

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Pure Data Packet (PDP) is an extension library for the computer music -program Pure Data (PD), by Miller Puckette and -others. Its goal is to provide a way to use arbitrary data types (data -packets) as messages that can be passed around inside PD, along side the -standard PD numbers and symbol types. In short it puts any data object on -the same level as a float or a symbol. - -

PDP runs on Linux and OSX. The OSX version depends on Fink, which is not in the "point & -click" stage yet, so setting it up will require some efford. There is no -windows version. The reason for this is simple: i don't use windows myself. -Porting would require writing code for input/output and getting the -libraries PDP depends on to work. If anyone is willing to do this, just let -me know. PDP can run without X Window, using SDL. - -

Currently, PDP's focus is on images and video, but there is no reason it -should stay like that. There is limited support for matrix processing -included in the main library (like Jitter or Gridflow). There is an -extension library for 1D and 2D binary cellular automata, opengl rendering -(like Gem). Some plans include audio buffers (like Vasp), ascii packets, -text buffers, ... Finally there's a library that enables you to connect a -scheme interpreter (guile) to PD/PDP. For more image processing objects, -have a look at Yves Degoyon's PiDiP library. - -

Getting Started

- -If you're used to working with PD, the the documentation and example -patches should be enough to get you started. Have a look at the README file -in the distribution to find out how to compile and setup. The file -doc/reference.txt contains a list of objects. If you have installed PDP -properly, you can just press the right mouse button on an object and select -help to get a help patch. If this doesn't work, look in the directory -doc/objects for a collection of help patches. The directory doc/examples -contains some more demos. The directory doc/objects contains two -abstractions that are used to setup the input and output in the help -patches. You might want to cut and connect some wires to use the -input/output setup that works for you. - -

Packets and Types

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PDP is centered around the concept of packets and operations on -packets. There are several types of packets. The default type for most -objects is image/YCrCb/320x240. This is a single video -frame, encoded in the internal 16bit YUV format, measuring 320 by 240 -pixels. Another image type is the grayscale image -image/grey/320x240. Important notes: All image processing objects that -combine two or more packets need to be fed with the same packet types, i.e. -encoding (YCrCb/grey) and dimensions need to be the same. Image dimensions need to be a -multiple of 8x8. - -

The -bitmap/*/* type is another image representation type -supporting several encodings. I.e. bitmap/rgb/*, -bitmap/rgba/*, bitmap/yv12/*, ... - -This type cannot be processed directly by most of the image processing -objects, but it can be used to store in delay lines, or to send over the -network. It's main use is to support all kinds of input/output devices, and -opengl textures, without introducing too many conversions, but it can serve -as a space and bandwidth saver too (especially -bitmap/yv12/*). - -

One of the interesting -features in PD is the possibility of connecting everything with everything. -If you want to generalize this to all kinds of media objects, the complexity -of managing the different types starts to grow quite fast. Therefore PDP has -a type conversion system that can take care of most of the conversions -using the [pdp_convert] object. You can manually convert -packets to a certain type by specifying a type template as a creation -argument. I.e. [pdp_convert image/grey/*] will convert -any packet to a greyscale image. Most of the conversion will become -automatic later on. - -

An example: You can use the basic PDP library together with the -cellular automata library and the opengl rendering library to use a cellular -automaton as an input to a video processing chain. You can convert the -processed image to a texture that can be applied to a 3d object, which then -can be drawn to the screen, captured as a texture, converted back to an -image, which can then be converted to a sound, processed and converted back -to an image, etc... You get the point. The possibilities are endless. - - - -

Tom Schouten

- - -Last modified: Thu Sep 25 20:51:44 CEST 2003 - - - -- cgit v1.2.1