Ivor Hewitt wrote:
On Wednesday 02 Feb 2005 04:43, MacNean C. Tyrrell wrote:Not much.
1. What info do you have so far?i am looking for any informaiton on the manufacturer or any information on the mpeg decoder on the sis gpu's such as the sis 315. According to Thomas Winischhofer: (his email reply to me, creator of the sis driver for X): I have no docs on the MPEG decoder and SiS refuses to help. (I believe that this MPEG decodes is a third party component for which SiS doesn't own the rights to disclose info).
Thomas told me the decoder is inside the GPU, so only way to find out model and make would be to tear apart the GPU, if it's even there after you tear it apart.
This is afternote after writing everything else, i did find a pdf file with their 3rd party partners:
http://www.sis.com/products/chipsets/oa/pentium4/M661MX_648MX_presentation.pdf
ICS, Realtek, Hitachi, Crypress and PLL. Perhaps the maker is one of them?
Also their dvd faq is here:
http://www.sis.com/support/faq/faq.php?faq_class=faq_c04&faq_id=
Although it doesn't mention the 315, the card i have, the two cards mentioned SIS 6326 and 300, are bother older and discontinued, but in their specs mention the features listed below, almost the same as the 315, so i know its never safe to assume, but assuming same architecture/maker of the decoder in the 315. Would the makes of windvd or powerdvd whatever be able to give information?
Plus below it mentions mpeg1/2 standard compliance, since it's standard couldn't there be a way to write code based on the standard to use the decoder?
2. Is there any software available at all? I assume there must be something otherwise why would they sell the chips?Supposedly windvd can use the dvd decoder to it's fullest potential, according to sis website, there are 2 other dvd navigator systems that can but their names escape me at this momment. The windows driver also i believe has the ability to make use of the decoder.
3. Do you know what features the decoder provides? i.e. does it do full mpeg decoding (a la dxr3) partial decoding (a la VIA VLD) or just motion compensation (a la Nvidia XvMC).
This is the features i've been able to find:
* MPEG-2 ISO/IEC 13818-2 [EMAIL PROTECTED] and MPEG-1 ISO/IEC 11172-2
standards
compliant
* Built-in motion compensation logic
* Supports up to 2Mbit/sec bit rate decoding Direct DVD playback
* Two video playback line buffers to support MPEG II and 1920 x 1080
video playback
* Supports single video windows with overlay function
* Supports tearing free double/triple buffer flipping
* DVD direct to TV4. Do you have the skill to disassemble a driver?I don't know. I was more hoping to get more info and pass that on to Thomas Winischhofer and help him with the driver. I would love to learn. I am a decent programmer, but this is something i've never done before. I don't care if it takes me a long time, from the way mythtv performs for me, unless hardware fails, i'll prolly keep using the same system for a very long time, have for 1.5 years now, and therefore that includes the sis gpu.
5. in what way is SIS refusing to help? what discussions have you had with them?I have not had any personal conversations with SiS. This information was from Thomas Winischhofer, he's the one who wrote and upkeeps the sis driver for linux. I personally wouldn't mind trying to contact them, i just don't know where to start. LIke i said never done this before and would love to.
If I knew where to start, I'd do it.
anywhere is better than nowhere.
Yea i know.
I know its a long shot, but was hoping someone somewhere might have some info, or know how to get some info.
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