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Binary standards for images and sounds
- To: crossfire (at) ifi.uio.no
- Subject: Binary standards for images and sounds
- From: "Carl Edman" <>
- Date: Thu, 14 Apr 94 18:52:36 -0400
- Reply-To:
None which are easily implemented on a wide variety of architectures
have been suggested yet, so please let me do so here. These are just
quick suggestions, so please do criticize (as if I had to ask) if you
disapprove of them.
IMAGES
======
I believe the following format is fairly close to being as compact as
it gets with small images. Furthermore it should be easy to parse on
virtually any architecture. Finally, it is fair as I don't think _any_
system uses it as its native format.
Byte Meaning
00 Unsigned char for the number of pixels in X direction
01 Unsigned char for the number of pixels in Y direction
02 Unsigned char indicating the number of components the image has
01 = greyscale image with complete covering
02 = greyscale image with alpha channel
03 = color image with complete covering
04 = color image with alpha channel
00 or 05... error
03..
03+number of components
Number of bit planes for the components (if they exist) in order:
B/W, R, G, B, Alpha
03+number of components+1 ..
03+number of components+1+((tot number of bitplanes*xsize*ysize+7)/8)
An array of bits which indicates the values for the above
components (in the above order) in the pixel order
(x,y) = (0,0),(1,0)..(xsize-1,0),(0,1),...,...(xsize-1,ysize-1)
SOUND
=====
Would there be much of an outcry if we just chose a headerless stream
of signed 8-bit mono samples to be played at 8 kHz ? Virtually all
sound hardware can play this easily and you can't get much simpler. Or
will the people with 44.1 kHz 16 bit stereo hardware feel cheated and
demand multiple sound qualities ? :-)
Carl Edman