Here are the sources for the series of examples developed in [this] thread.
Note: the samples are for version 2.5
SimpleSample 1.0b - simple documented sample that just copies the source frame to the destination in RGB and YUV colourspaces.
SimpleSample 1.1 - additions to handle planar colourspaces (e.g. YV12).
SimpleSample 1.2 - Revert to RGB24 colourspace only to show simple pixel manipulation.
SimpleSample 1.3a - Add in code to handle parameters in filters.
SimpleSample 1.4 - Add in RGB32 colourspace code.
SimpleSample 1.5a - Add in YUY2 code.
SimpleSample 1.6 - and finally YV12 as well.
SimpleSample 1.7 - Add in ability to use info from 2 clips only the YUY2 colorspace code altered.
Classes and function calls in AviSynth plugins - about classes and function calls in AviSynth plugins.
$Date: 2006/11/24 18:21:26 $
Original version of this document at http://www.avisynth.org/SimpleSample