Date: Sun, 28 Jan 1996 14:35:54 -0800 From: "Amancio Hasty Jr." <hasty@rah.star-gate.com> To: Terry Lambert <terry@lambert.org> Cc: jkh@time.cdrom.com, luigi@labinfo.iet.unipi.it, james@miller.cs.uwm.edu, dufault@hda.com, hackers@freebsd.org, multimedia@rah.star-gate.com Subject: Re: Amancio's tv program with capture! Message-ID: <199601282235.OAA00633@rah.star-gate.com> In-Reply-To: Your message of "Sun, 28 Jan 1996 14:29:24 MST." <199601282129.OAA01511@phaeton.artisoft.com>
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>>> Terry Lambert said: > > 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. Should be interesting at any rate, I wouldn't mind posting on comp.sys.intel the broken motherboards provided of course that there are any. The verdict is out on this one and yes you have the right to be suspicious ... I just need to find the time to sit down and write the code and it shouldn't take more than 1/2 day to implement the the first phase. > > *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? Terry, the meteor can do scaling as well as the S3 968 class of video cards. On the meteor side, we can close the meteor and re-open it with a new geometry. By doing on the meteor side of things we increase the possibility of the scaling working for cards other than S3 968 class. So the answer is yes! > > 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-). Or you can buy a o Matrox meteor PCI video $495 o S3 968 based card with 4MB of VRAM about $400 o a video camera $500 --- or for less you can get a ccd camera So give or take about $1400 provided of course that you already don't have an S3 968 PCI card and video camera, if so the cost is just $495. A lot less than $10000 8) Enjoy, Amancio
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