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authoretobi <git@e-tobi.net>2013-09-03 09:48:45 +0200
committeretobi <git@e-tobi.net>2013-09-03 09:48:45 +0200
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treeaffff927f15c8ae6c77890cc9564855efe2e51db /util/alevt/README.OLD
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+Hi, Menden, 21 Sep 2000
+
+ This program decodes and displays Videotext/Teletext from a
+ /dev/vbi device.
+
+
+COMPILE & INSTALL:
+
+ There's nothing to configure. A simple 'make' is all.
+ If you do not want png support remove the WITH_PNG in
+ the Makefile. Additionally, if you want a smaller font
+ uncomment the "FONT=neep9" line.
+
+ It gives you 'alevt', 'alevt-date', and 'alevt-cap' and
+ their man pages 'alevt.1x', 'alevt-date.1', and 'alevt-cap.1'.
+
+ You can install them where ever you want (i.e. /usr/local/bin).
+ The programs are self-contained and require no other files.
+
+ NOTE: Be careful with 'make install'. It's just for me :-)
+
+
+PROBLEMS:
+
+ If you have a lot of decoding errors (lot of these lightning symbols)
+ you may try pressing the 'f' and 'F' key. This allows fine tuning of
+ the decoder circuit. There's also a -finetune command line option.
+ This should only be necessary on really bad signals.
+
+ Maybe, I add autotuning later...
+
+ UPDATE: added autotuning. It's the default. If you add -debug the
+ the actions of the pll are printed to stdout.
+
+ To get the old (pre finetune) behaviour start it with -finetune 0.
+
+ UPDATE: disabled autotuning *g* sometimes it's too jumpy...
+
+
+ALEVT-DATE:
+ I added a little tool to set the system time from the videotext
+ time. The date is not interpreted (not even transmitted on some
+ channels). So it allows only adjustment of +/-12 hours.
+ The default allowed adjustment is limited to +/-2 hours (use
+ -delta to change). Without the -set option it just display
+ the date in the format of the date command. Look at strftime(3)
+ for possible control sequences you may use in the -format option.
+
+
+HACKING:
+
+ If you want to play with the font size, you may resize it with
+ xv (xv font1.xbm). Just make sure, that its width is a multiple of
+ 32 and its height a multiple of 8. A simple make will create
+ a version of AleTV with the new font. Warning: a make clean
+ will erase font1.xbm. The next make will recreate font.xbm from
+ vtxt.bdf.
+
+ AleVT has a built in page editor. If you start it with -editor
+ you may press 'E' to invoke it. For the usage you have to consult
+ the sources. (It's very crude!)
+
+
+TODO: (no specific order)
+
+ - Error correction in alevt-cap
+ - Better language support. Internal 16-bit charset.
+ - Separated graphics.
+ - Rewrite the whole stuff. A networked teletext daemon and clients
+ that connect to it for display, capture, cgi, ...
+
+
+NEWER VERSIONS:
+
+ The primary site of AleVT is http://goron.de/~froese
+
+Have fun,
+Edgar Toernig (froese@gmx.de)