On Thursday 06 September 2001 03:53, Ron wrote:
> I guess my first question would be, if your talking NTSC video at
> 60 fields per second i.e. normal 30 frames per second video, why
> are you bothering to use RTLinux in the first place, even an
> old 33mhz 486 can service interrupt rates that low (and do large
> amounts of processing in the interrupt service routine) without
> breaking a sweat. I've done it myself some years ago with a frame
> grabber I designed around the old philips SAA7195 chip set. Try
> doing what you need to do in userland, just as a test, I'll bet
> you'll see that 16ms is a very very long time on any newer
> processor.
Good point! With Linux/lowlatency, it should be possible to do it all in
user space - even under heavy system stress - provided the driver
supports a usable buffering configuration. (I've tested a software RDC/AC
motor servo regulator at 2 kHz with one frame in-one frame out buffering
without any missed deadlines, so 30 or 60 Hz should be totally reliable.)
//David Olofson --- Programmer, Reologica Instruments AB
.- M A I A -------------------------------------------------.
| Multimedia Application Integration Architecture |
| A Free/Open Source Plugin API for Professional Multimedia |
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.- David Olofson -------------------------------------------.
| Audio Hacker - Open Source Advocate - Singer - Songwriter |
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