Date: 27 Feb 95 18:45:00 
Subject: DVM movie file format

DESCRIPTION DVM FORMAT (v1.0, v2.0, v3.0 and v3.1)
==================================================

HEADER

3 bytes:        "DVM"
1 byte:         version 1.0: "Q": quarter screen, "F": full screen.
..higher versions: "V".
Only by versions 2.0 and higher:
.1 byte version: Left nibble before point, right nibble after point.
.1 byte infobyte: Bits got the folowing information:
..bit 7:  0: quarter screen (160x100)     Version 2.0 and higher
...1: full screen (320x200)
..bit 6:  0: not compressed
...1: compressed
..bit 5:  0: standard palette (see next page)
...1: enhanced palette
..bit 4:  0: 16 colors                    Version 3.0 and higher
...1: 256 colors
..bit 3:  0: no text                      Version 3.1 and higher
...1: text exist
1 word: time (ms) to wait after each frame.
If text exist:
.1 word: number of characters:
.x bytes: characters.

N.B. by version 1.0 the shower should define infobyte like this:
.If full screen: a0h = 160d
.If quarter screen: 20h = 32d

FRAMEDATA

If enhanced palette:
.If 16 colors: 48 bytes 6 bits rgb palette (r0, g0, b0, r1, g1, b1,
......   ..., r15, g15, b15)
.If 256 colors: 768 bytes rgb palette (0..255)

Framedata: 
>From left to right, from top to bottom. 
Example (quarter screen uncompressed):

.var
.   bt: byte;
.   fi: file;
.   x, y: word;
.(...)
.for y:=0 to 99 do
.   for x:=0 to 159 do
.   begin
.      blockread(fi,bt,1);
.      putpixel(x,y,bt);
.   end;

If compressed: Left nibble = byte 1, right nibble = byte 2.
Example (quarter screen compressed):

.var
.   bt: byte;
.   fi: file;
.   x, y: word;
.(...)
.for y:=0 to 99 do
.   for x:=0 to 79 do
.   begin
.      blockread(fi,bt,1);
.      putpixel(x*2,y,(bt and $f0) shr 4);
.      putpixel(x*2+1,y,bt and $0f);
.   end;

STANDARD PALETTE

Does not exist in file, should be included with viewer.
Can be created like this;

.var
.   palette: array [0..255] of record red, green, blue: byte; end;
.   b, c, g, r: byte;
.(...)
.for c:=0 to 15 do
.   with palette[c] do
.   begin
.      red:=round(c*4.2);
.      green:=round(c*4.2);
.      blue:=round(c*4.2);
.   end;
.for r:=0 to 5 do
.   for g:=0 to 5 do
.      for b:=0 to 5 do
.. with palette[r*36+g*6+b+16] do
.. begin
..    red:=round(r*12.6);
..    green:=round(g*12.6);
..    blue:=round(b*12.6);
.. end;
.for c:=0 to 7 do
.   begin
.      with palette[232+c] do
.      begin
.. red:=c*9;
.. green:=0;
.. blue:=0;
.      end;
.      with palette[240+c] do
.      begin
.. red:=0;
.. green:=c*9;
.. blue:=0;
.      end;
.      with palette[248+c] do
.      begin
.. red:=0;
.. green:=0;
.. blue:=c*9;
.      end;
.   end;

The DVM format was created by Magic Software and may only be modified by
members of Magic Software.

Any questions or suggestions? Write me!
E-mail: bert.greevenbosch@mmm.xs4all.nl
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