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How to add a complicate property to an element

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Hu, Gang A

How to add a complicate property to an element

Hi,

I want to add a property to a camera source element. This property contains five field. How can create this property with one property id and extract it?

For example, to add the ae_windows property to the v4l2src, the user can use the command

gst-launch v4l2src ae_windows=”width=49, height=60, centerx=20, centery=30, weight=3” ! xvimagesink.

to specify the ae_windows.

Thanks.

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Wes Miller

Re: How to add a complicate property to an element

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You aren't adding properties to v4l2src, they already exist in the element and you are just setting values into them. See gst-inspect v4l2src for details.

You'd need a rewritten version of your element if you need your property to be settable and to have it actually do something.

Wes

Stefan Sauer

Re: How to add a complicate property to an element

In reply to this post by Hu, Gang A

Am 01.01.2011 04:52, schrieb Hu, Gang A:
> Hi,
> I want to add a property to a camera source element. This property contains five
> field. How can create this property with one property id and extract it?
> For example, to add the ae_windows property to the v4l2src, the user can use the
> command
> gst-launch v4l2src ae_windows=”width=49, height=60, centerx=20, centery=30,
> weight=3” ! xvimagesink.
> to specify the ae_windows.

While you could define your own gparamspec type, i would sugest you to simply
add 4 properties instead. Please use a descriptive name so that people won't
have to guess what "ae" stands for.

Stefan

> Thanks.
>
>
>
>
>
> ------------------------------------------------------------------------------
> Learn how Oracle Real Application Clusters (RAC) One Node allows customers
> to consolidate database storage, standardize their database environment, and,
> should the need arise, upgrade to a full multi-node Oracle RAC database
> without downtime or disruption
> http://p.sf.net/sfu/oracle-sfdevnl
>
>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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Hu, Gang A

Re: How to add a complicate property to an element

Stefan.
Thanks for your suggestion. I would like to keep the property list small.
As composited property is not common in GStreamer, adding 5 property for the
Windows settings maybe a good choice right now.
Thanks.

-----Original Message-----
From: Stefan Kost [mailto:[hidden email]]
Sent: Saturday, January 08, 2011 7:20 PM
To: Discussion of the development of GStreamer
Cc: Hu, Gang A
Subject: Re: [gst-devel] How to add a complicate property to an element

Am 01.01.2011 04:52, schrieb Hu, Gang A:
> Hi,
> I want to add a property to a camera source element. This property contains five
> field. How can create this property with one property id and extract it?
> For example, to add the ae_windows property to the v4l2src, the user can use the
> command
> gst-launch v4l2src ae_windows="width=49, height=60, centerx=20, centery=30,
> weight=3" ! xvimagesink.
> to specify the ae_windows.

While you could define your own gparamspec type, i would sugest you to simply
add 4 properties instead. Please use a descriptive name so that people won't
have to guess what "ae" stands for.

Stefan