Alaris VideoGramPiX: Difference between revisions
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* FourCCs: VGPX | * FourCCs: VGPX | ||
* Company: [[Alaris]] | * Company: [[Alaris]] | ||
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
- FourCCs: VGPX
- Company: Alaris
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.