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Text File
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1994-04-22
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4KB
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128 lines
aMiPEG - a MPEG video stream player for the Commodore Amiga
-----------------------------------------------------------
This is version 0.4 (22-Apr-94), (c) 1994 Michael Rausch
See the file COPYRIGHT for the copyrights accompanied with the sources
this work is based upon.
INTRODUCTION
aMiPEG is a player for MPEG video streams for the Commodore Amiga. It
is based upon the Berkeley X-Windows player version 2.0, with major
changes in speed and size.
Main advantages are much faster decoding of the streams compared with
other products based on the Berkeley sources, and a real-time scaling
to fit on a complete HAM screen (no thumbnail animations anymore!).
In addition, aMiPEG comes with full source code supplied for the
technical interested. Extensive technical information will be written
for the next release, if there's enough interest (on your and my side).
DISCLAIMER
This software is provided as-is, without warranty of any kind, either
expressed or implied. In no event will the author be liable for direct,
indirect, incidental or consequential damages or data loss resulting
from the use or application of this software. The entire risk as to the
results and performance of this software is assumed by the user.
REQUIREMENTS
AGA chipset is recommended, OS 2.04 or up required. With version 0.3,
rendering to a HAM6 screen is supported.
Implied with the usage of MPEG is some speedy processor as well. 68020
will do, but don't expect too much. "DebbieHarry.mpeg", which I use for
testing purposes, is played with 1.0 fps on my chipmem-only A1200 (PAL
screen), compared with 6.5 fps on the A4000/040 (Euro72 screen) and
3.1 fps on an A2000 with 28Mhz 2630 (PAL screen).
For recompilation, SAS/C and Devpac assembler is required. Other compilers
and/or assemblers may work with some fiddling.
BACKGROUND
The main work with aMiPEG was done in about one week, mainly with modular
usage from within other productions in mind. In fact, it is thought to be
used in my next game for some background animation.
This implies that it is far from being perfect, but you are free to modify
and use the source, as long as you are so kind and report bugs and post
your improvements to me, if possible.
ADDITIONAL INFORMATION
An optimized JPEG codec is also available. Mail me if you are interested in
it and want it to be released like this one.
LOOKING FOR
Information on MPEG system streams or complete (CD-I) movies in general. If
you got any of those ... please contact me asap.
CONTACT
You can reach me via email at
linux@uni-koblenz.de
In fact, my account is rausch@uni-koblenz.de; but with this, I'm not allowed
to receive/send any mail from/to outside the campus.
Alternatively, you might try FidoNet
2:245/5618.3
or snail-mail:
Michael Rausch
Schanzenpforte 33-35
D-56068 Koblenz
HISTORY
V0.1 * First public release
* Some cosmetic changes to be done.
V0.2 * Oops, wrong ZIP code in the snail-mail address
* Bug with scaling of animations >200 pixel vertical is fixed.
* Little bit faster & tighter
V0.3 * HAM6 rendering
* Somehow, the times got mixed up. NOW it renders to HAM8 with
6.5 fps (was 6.3) on the A4000/040 as the code is somewhat
streamlined and more parts are moved to assembler.
* Uses default public screen's mode ID now instead of default monitor's.
V0.4 * Forgot the Multiscan monitor ID (several people mailed me about this;
really sorry guys)
* Autodetect non-AGA chipset, force HAM6 in this case
* Minor speed-up in the iDCT (in fact not worth mentioning)
* This is an intermediate release; 0.5 will contain the TODO stuff
listed down there.
BUGS
* When dragging the screen on a Kick 2 machine, the copper stuff gets
messed up and it displays video in the vblank. No idea why, but who
cares anyway.
* Problems with large anims on a PAL screen; don't know why and don't
care either.
TODO
* asynch I/O
* 96 pixels or 80 pixels wide animations look awful.
New scaling modes are not ready yet.
* MPEG audio is on it's way. The demo codec from DEC is running,
Tobias Bading's maplay is ported to Amiga and rewritten for integer
arithmetic ...