Difference between revisions of "Alaris VideoGramPiX"

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* FourCCs: VGPX, VTLP
* FourCCs: VGPX
* Company: [[Alaris]]
* Company: [[Alaris]]
* Samples:
** VTLP: http://samples.mplayerhq.hu/V-codecs/VTLP-VGPX/


Sample Java player available here: http://www.ila-ila.com/xvd-hist/sites/vgram/index.htm
Sample Java player available here: http://www.ila-ila.com/xvd-hist/sites/vgram/index.htm
The codec works by reading a code for an operation using a codebook and performs some action on pixels (RGB triplets in this case) depending on it (usually copy, skip or average):
* 0 - skip current pixel
* 1 - copy left pixel value
* 2 - copy top pixel value
* 3 - copy right pixel value
* 4 - copy bottom pixel value
* 5 - set pixel to an average of top and left pixels
* 6 - set pixel to an average of top and right pixels
* 7 - set pixel to an average of bottom and right pixels
* 8 - set pixel to an average of bottom and left pixels
* 9 - read a code for pixel difference (each codebook entry has differences for every component)
* 10 - skip a number of pixels the number of times defined in frame header
* 11 - repeat left pixel value the number of times defined in frame header
Something similar can be found in an alternative frame coding method for VT codec of [[VGM Video]] family.


[[Category:Video Codecs]]
[[Category:Video Codecs]]
[[Category:Undiscovered Video Codecs]]
[[Category:Undiscovered Video Codecs]]

Revision as of 10:47, 18 February 2021

Sample Java player available here: http://www.ila-ila.com/xvd-hist/sites/vgram/index.htm

The codec works by reading a code for an operation using a codebook and performs some action on pixels (RGB triplets in this case) depending on it (usually copy, skip or average):

  • 0 - skip current pixel
  • 1 - copy left pixel value
  • 2 - copy top pixel value
  • 3 - copy right pixel value
  • 4 - copy bottom pixel value
  • 5 - set pixel to an average of top and left pixels
  • 6 - set pixel to an average of top and right pixels
  • 7 - set pixel to an average of bottom and right pixels
  • 8 - set pixel to an average of bottom and left pixels
  • 9 - read a code for pixel difference (each codebook entry has differences for every component)
  • 10 - skip a number of pixels the number of times defined in frame header
  • 11 - repeat left pixel value the number of times defined in frame header

Something similar can be found in an alternative frame coding method for VT codec of VGM Video family.