From owner-freebsd-hackers Sun Jan 28 13:34:20 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id NAA02531 for hackers-outgoing; Sun, 28 Jan 1996 13:34:20 -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 NAA02524 for ; Sun, 28 Jan 1996 13:34:15 -0800 (PST) Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id OAA01511; Sun, 28 Jan 1996 14:29:24 -0700 From: Terry Lambert Message-Id: <199601282129.OAA01511@phaeton.artisoft.com> Subject: Re: Amancio's tv program with capture! To: hasty@rah.star-gate.com (Amancio Hasty Jr.) Date: Sun, 28 Jan 1996 14:29:24 -0700 (MST) Cc: jkh@time.cdrom.com, terry@lambert.org, luigi@labinfo.iet.unipi.it, james@miller.cs.uwm.edu, dufault@hda.com, hackers@freebsd.org, multimedia@rah.star-gate.com In-Reply-To: <199601280750.XAA00879@rah.star-gate.com> from "Amancio Hasty Jr." at Jan 27, 96 11:50:43 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 > 3. I can spot graphic cards which don't support a linear buffer or don't > have the linear buffer mmap and in such cases just exit out of tv > or resort to the shared memory method. Resort to the shared memory method, please. Makes it much more widely available! > The changes required to support wiring the graphic card's buffer > to the meteor driver are minimal. How do you deal with bus-to-bus DMA cache effects? It seems likely that this type of usage is one that wasn't considered by the motherboard manufacturers... considering how many of them have blown simple bus-to-memory DMA cache update/invalidate. > *First* phase at high speed video just raw dump on the screen. > *Second phase port the xvideo extensions to XFree86 and > make necessary changes to the X server. That's sexy -- a draggable video window -- resizable as well? Are you going to put scaling in the copy? > Now, for the religious X cult fans if they don't like this approach > they can always resort to a shared buffer access at the cost of > lower performance. Or those of us with less than $10,000 in video hardware. 8-). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.