DOS ain't dead

Message from Michael Kostylev:

Done, http://mik.mkw.ru/dos-stuff is a full mirror of http://mik.dyndns.org/dos-stuff now.

Michael

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DOS gives me freedom to unlimited HW access.

http://mik.mkw.ru/dos-stuff
Gets "Forbidden
You don't have permission to access /dos-stuff on this server."

http://mik.dyndns.org/dos-stuff
Gets "403 Forbidden"

However, http://mik.mkw.ru/ gets a page with two subdirs, /dos_stuff, and /Debian-cross, which opens up to a filelist.

Yesterday I downloaded the Vidix source and quickly looked on it. It seems that hardware acceleration support is very limited if any. The reason why is it faster is the DMA busmastering technique when copying data from RAM into VideoRAM. The copying is not done by processor but via DMA like soundcards.
Does somebody know something about this technique?

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DOS-u-akbar!

> Yesterday I downloaded the Vidix source and quickly looked on it. It seems
> that hardware acceleration support is very limited if any. The reason why
> is it faster is the DMA busmastering technique when copying data from RAM
> into VideoRAM.

Don't forget the fact that Vidix uses hardware accelerated colorspace conversion, which is very important.

When I click both links just now the are working...

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DOS gives me freedom to unlimited HW access.

> Does somebody know something about this technique?

I only know that it exist but never programmed DMA. If someone have a short example how to use DMA under DJGPP to transfer data from program space to peripheral memory mapped buffer like LFB i§d like to see it.
I normaally use movedata to transfer offscreen buffer to mapped physical memory of LFB and on later HW (PII + AGP) it's pretty fast.

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DOS gives me freedom to unlimited HW access.

For now all the links work. The newest DOS Mplayer release (from 27 Jan) implements a "dll loader". Unfortunately Michael doesn't give more details.

> For now all the links work. The newest DOS Mplayer release (from 27 Jan)
> implements a "dll loader". Unfortunately Michael doesn't give more
> details.

He was trying something with WMA9 DLL:
I've just tried to play wmv9 but wmv9dmod.dll fails to load with mmap error, so ffmpeg is used as before. Unfortunately I cannot find any examples how to use the __dpmi_allocate_linear_memory function from dpmi 1.0 required for MAP_FIXED mapping. My simple tests work correctly but that stuff is useless.

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DOS gives me freedom to unlimited HW access.

> When I click both links just now the are working...

Still not working for me. What could his servers be blocking?

> He was trying something with WMA9 DLL

Aha, he tries to implement a PE DLL loader for using with external codecs. What DPMI server he uses? From what I know CWSDPMI doesn't support DPMI 1.0 function AX = 0504H (Allocate Linear Memory Block), so if he uses CWSDPMI, he has no chance. OTOH HDPMI32 (for example) supports this function.