Video Cards :: Video Memory Intercept and Redirect Post: 302482780

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Top Forums UNIX for Advanced & Expert Users Video Cards :: Video Memory Intercept and Redirect Post 302482780 by ciNG on Wednesday 22nd of December 2010 01:45:28 PM

12-22-2010

Registered User

Video Cards :: Video Memory Intercept and Redirect

I need a broad spectrum understanding on this subject, and any help would be greatly appreciated.

First of all, as I understand it...
The way the video hardware works is the CPU sends information about input and possible changes to the display, the video card receives these changes, makes the necessary changes to its memory cache, and then sends out the new information to the display.

Input -> CPU -> VideoCard -> Display

...now this is a very simple understanding, if you can blow my mind by proving my ignorance with more specific and technical semantics it would be greatly appreciated. I feel my personal research has plateaued beneath the necessary esoteric terminology.

Next I want to know how I can get at those arrows inbetween. Are there ways, software'hardware, to pipe the raw data, binary, traveling between these points into another destination for manipulation andor examination purposes?

Thirdly, if there is a built in video card in my motherboard and also a supported third party videocard, how can I tell my computer to use the third party card? Is this a kernel config thing? Modules? A HALd thing? I know the actual setting up of this is a simple process. I am not looking for a tutorial how to do this, I want to know how the computer learns to do it as a result of my telling it to do so.

Finally, I have been running around a number of repositories like an asshole with his head chopped off looking for clues to these answers. I've looked into HAL, VNC, X, udev, pciutils, but honestly I don't know where to begin, or what I'm looking for within their respective functions. They all just seemed to harness, in one way or another, this thing I am looking for...

If this question is too big or obtuse, and someone wants to just say: read this; also very much appreciated.

ciNG

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LEARN ABOUT DEBIAN

rtpfeed

RTPFEED(1)							      Debian								RTPFEED(1)

NAME

       rtpfeed - Feed a DVB-S card with an RTP	unicast/multicast/broacast stream

SYNOPSIS

       rtpfeed [ --group group ] [ --port port R] [ --vpid vpid ]  [ --apid apid ]

       rtpfeed --help

       rtpfeed --version

DESCRIPTION

       rtpfeed	takes a unicast, multicast or broadcast RTP stream from a network (typically generated by dvbstream running on a server) and feeds
       it to a DVB-S card for decoding and display.

       As an RTP transport stream from dvbstream can contain multiple (up to eight) video streams and audio streams, the streams to display may be
       explicitly named on the command line.

OPTIONS

       -g, --group  addr
	      The IP address of the RTP stream. By default, this is 224.0.1.2.

       -p, --port portnum
	      The IP port of the RTP stream. By default, this is 5004.

       -v, --vpid vpid
	      The Video PID of the video stream to display. If none is specified, all present are fed to the DVB card.

       -v, --apid apid
	      The Audio PID of the audio stream to display. If none is specified, all present are fed to the DVB card.

       --help display this help and exit

       --version
	      output version information and exit

SEE ALSO

       dvbstream(1), dumprtp(1), and ts2es(1)

HISTORY

       Parts of this program were taken from dumprtp.c by David Podeur.

AUTHORS

       rtpfeed was writteb by  Guenter Wildmann, <g.wildmann@it-lab.at>,
	with parts taken from dumprtp.c by David Podeur.

       This man page was written by Alastair McKinstry, <mckinstry@computer.org>.

Linux								   28 July 2002 							RTPFEED(1)