Caps filtering

[Sebastian Dröge]

On Mo, 2015-11-16 at 05:01 -0800, R S wrote:
> Hi,
> 
> I am new to GStreamer. I am designing a source capture plugin named
> "my_src". Following is the sample pipeline:
> 
> gst-launch-1.0 my_src name=src src.raw_src ! 'video/x-raw,
> framerate=(fraction)15/1, width=640, height=480' ! filesink
> location=test_640_360.yuv
> 
> I want to extract the caps from the pipeline and initialize my camera
> accordingly before starting to stream. Please give me idea, how to
> fetch height, width, format, framerate etc. from my pipe during
> initialization.

If your source element is based on GstBaseSrc (it should!), then you
will get the caps that are negotiated in the GstBaseSrc::set_caps()
vfunc. GstBaseSrc will check before starting what downstream supports,
and then chooses one of the options (see the GstBaseSrc::fixate() vfunc
for overriding the default behaviour) and notifies you about those
caps.

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com

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