From owner-freebsd-multimedia Sun Feb 23 14:02:20 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id OAA04562 for multimedia-outgoing; Sun, 23 Feb 1997 14:02:20 -0800 (PST) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by freefall.freebsd.org (8.8.5/8.8.5) with SMTP id OAA04555 for ; Sun, 23 Feb 1997 14:02:16 -0800 (PST) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id WAA20000 for multimedia@freebsd.org; Sun, 23 Feb 1997 22:14:19 +0100 From: Luigi Rizzo Message-Id: <199702232114.WAA20000@labinfo.iet.unipi.it> Subject: Teletext decoding To: multimedia@freebsd.org Date: Sun, 23 Feb 1997 22:14:18 +0100 (MET) X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-multimedia@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hi, if someone is interested in decoding Teletext/Videotext data acquired with a frame grabber, I have some code which does the job. You need your frame grabber to acquire the lines containing teletext data (usually before the visible area); a simple patch to the meteor driver does the job, I assume th bt848 driver can also do the same thing. The sampling rate is not exceedingly important (provided it is high enough, e.g. 640 pixels) since I use a routine from sox to do the resampling with the correct values. Those interested can send me email for a copy. Luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________