[GEM-dev] VideoIO Framework

[IOhannes m zmoelnig]

Mathieu Bouchard wrote:
> On Wed, 13 Jun 2007, IOhannes m zmoelnig wrote:
> 
>>>   I can maybe see the utility on Linux but what you propose makes no
>>> sense on OSX or Windows.
>> it makes sense on windows, as there are already 2 (or 3, if you count
>> the old vfw/avi stuff) APIs (directshow, quicktime).
>> on os-x things are a bit different, as there is basically just one API.
>> nevertheless, the platform that will benefit most from it will be linux.
> 
> IMHO it should handle also live video input (cameras) and live video
> output (X11, Xv, with or without SHM, and then SDL, OSX, ...). If it
> handles at least V4L1 and V4L2, count me in for GridFlow support.

yes definitely.
i have forgotten the v4l1 and v4l2 stuff in my enumeration of "stream
readers", most likely because this was just to obvious.

video-out modules are what i meant by "stream writers" and could include
just anything that is able to produce video out (e.g. output the video
via a specialist hardware that is NOT a gfx card); it just saved me some
typing to only mention firewire instead of losing myself in details
about my ****-branded video-card.


so i'll try again:
the framework should cover::
+ stream readers (sequential read access to video-streams; with
"video-stream" i mean anything that emits a number of images but where i
 (as audience) do not have control of the time)
+ random access readers (like stream-readers; but this time with added
control on the time-axis)
+ stream writers (writing videos sequentialls)

i don't thing that "random access writers" do make much sense.

no assumptions about the interfaces accessed via this framework should
be made (hardware, software, web,...)


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IOhannes




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