https://wiki.multimedia.cx/index.php?action=history&feed=atom&title=VIP_VideoVIP Video - Revision history2026-04-10T09:36:09ZRevision history for this page on the wikiMediaWiki 1.39.5https://wiki.multimedia.cx/index.php?title=VIP_Video&diff=15838&oldid=prevKostya: fill description2024-12-18T10:41:18Z<p>fill description</p>
<p><b>New page</b></p><div>This is a format used in PC port of <em>Zorton Brothers</em> game known as [https://www.mobygames.com/game/14400/los-justicieros/ Los Justicieros]. It employs a mix of RLE and 2-colour vector quantisation in paletted format.<br />
<br />
File header (all values are little-endian):<br />
5 bytes - "VIP01"<br />
2 bytes - number of chunks<br />
2 bytes - video width<br />
2 bytes - video height<br />
4 bytes - always zero?<br />
2 bytes - always 125, probably fps*10<br />
2 bytes - unknown<br />
12 bytes - zeroes?<br />
<br />
The rest of file is a sequence of chunks with 8-byte header:<br />
2 bytes - chunk size<br />
1 byte - duration<br />
1 byte - chunk type<br />
1 byte - unknown<br />
1 byte - fade step<br />
2 bytes - 0xC060<br />
<br />
Known chunk types are:<br />
* 0 - skip frame<br />
* 2 - VGA palette update (first byte - start index, second byte - number of colours to update, then RGB triplets and usually two unknown bytes at the end)<br />
* 3 - raw frame<br />
* 4 - intra RLE frame<br />
* 5 - inter RLE frame<br />
* 6 - RLE+2-colour 4x4 tiles<br />
* 7 - 8-bit PCM audio<br />
* 9 - ignored<br />
* 11 - 4x2 2-colour tile frame<br />
* 12 - black frame<br />
* 13 - fade out (with new palette in the same format as chunk type 2)<br />
* 14 - fade out<br />
<br />
== Video compression ==<br />
=== Intra RLE (mode 4) ===<br />
<br />
RLE operation is one byte, top bit is operation kind (copy/run), low 7 bits are operation length minus one.<br />
<br />
=== Inter RLE (mode 5) ===<br />
<br />
In this mode frame is split into strips with the changed data and only changed pixels in the strips are coded.<br />
<br />
16 bits - ignored, probably width<br />
16 bits - number of strips<br />
for each strip {<br />
16 bits - number of lines to skip after the previous strip<br />
16 bits - strip height<br />
for each line {<br />
8 bits - number of operations<br />
for each operation {<br />
8 bits - number of pixels to skip<br />
8 bits - RLE opcode (same as mode 4)<br />
}<br />
} <br />
}<br />
<br />
=== RLE plus 4x4 tiles (mode 6) ===<br />
<br />
This mode resembles mode 5 except that instead of individual pixels whole 4x4 tiles are painted. I.e. "copy 3" operation means painting three tiles while "run of 5 tiles" means reading one tile definition and painting it five times.<br />
<br />
Each tile is coded as 16-bit mask and two colour indices.<br />
<br />
=== 4x2 tiles (mode 11) ===<br />
<br />
Frame can be coded in two modes: intra (all tiles are coded explicitly) and inter (bitmask in the beginning tells which tiles to update). The very first byte signals inter mode if non-zero. Then optional update bitmap follows (one bit per tile, MSB first) and actual tile data.<br />
<br />
Tiles are coded as two colour indices and 8-bit mask telling which colour to use.<br />
<br />
[[Category:Game Formats]]</div>Kostya