From owner-freebsd-hackers Sun Jan 28 13:23:38 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id NAA01886 for hackers-outgoing; Sun, 28 Jan 1996 13:23:38 -0800 (PST) Received: from phaeton.artisoft.com (phaeton.Artisoft.COM [198.17.250.211]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id NAA01878 for ; Sun, 28 Jan 1996 13:23:32 -0800 (PST) Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id OAA01470; Sun, 28 Jan 1996 14:19:29 -0700 From: Terry Lambert Message-Id: <199601282119.OAA01470@phaeton.artisoft.com> Subject: Re: Amancio's tv program with capture! To: jkh@time.cdrom.com (Jordan K. Hubbard) Date: Sun, 28 Jan 1996 14:19:29 -0700 (MST) Cc: terry@lambert.org, luigi@labinfo.iet.unipi.it, james@miller.cs.uwm.edu, dufault@hda.com, hackers@freebsd.org, hasty@rah.star-gate.com, multimedia@rah.star-gate.com In-Reply-To: <24115.822812401@time.cdrom.com> from "Jordan K. Hubbard" at Jan 27, 96 11:00:01 pm X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org Precedence: bulk > > > BTW, the server doesn't use pixmaps with the shared memory extension. > > > It uses XImages. > > > > You can't avoid having to do the conversion. > > I understand that - I simply wanted to make the point that it wasn't > pixmap information being "wired", but XImage information. Check the > X11 protocol spec - there's a predefined low-level data type for > XImages (and Pixmaps are only passed by integer ID anyway). I realize the intended format of the shared memory region that the server will access. I don't believe that the mapped capture card memory can be made to resemble the region except for very special cards. As Amancio points out, a bus mastering frame grabber gould utilize DGA to write video card memory, with a lot of caveats. Personally, I'd like to see it eating an extra copy and working on all hardware rather than using DGA and working on 1/10th of all hardware. Not that I have an mbone connection anyway. 8-(. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.