How do I retrieve GstBuffer from a GstPad?

[geospatialdeveloper]

While a pipe is running I want to transfer data from the source pad of a
Transform element.
Is there some way I can do it?



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[Nicolas Dufresne-5]

Le jeu. 17 janv. 2019 19 h 13, geospatialdeveloper <[hidden email]> a écrit :

While a pipe is running I want to transfer data from the source pad of a
Transform element.
Is there some way I can do it?

Would you mind extending on what you want to do. There is a large amount of ways to access streaming data, so more context is required in order to give you a proper answer.

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[geospatialdeveloper]

So I have a simple pipeline with a custom source element that reads a Tiff
file, a custom transform element that applies an algorithm to the pixels
read in and a sink element that writes out a new Tiff file. This pipeline
works.

I'm trying to write a shared library to have a function that will load the
pipe in memory but instead of the sink element writing out the Tiff file
will write the data into a memory location so that applications using the
shared library can call the function and have access to the processed
pixels.

I did try to read the source pad of the transform element but with no sink
in the pipe, the pipe does not execute.



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[Nicolas Dufresne-5]

Le vendredi 18 janvier 2019 à 07:27 -0600, geospatialdeveloper a
écrit :

> So I have a simple pipeline with a custom source element that reads a Tiff
> file, a custom transform element that applies an algorithm to the pixels
> read in and a sink element that writes out a new Tiff file. This pipeline
> works.
>
> I'm trying to write a shared library to have a function that will load the
> pipe in memory but instead of the sink element writing out the Tiff file
> will write the data into a memory location so that applications using the
> shared library can call the function and have access to the processed
> pixels.

Then use appsink I would say.

>
> I did try to read the source pad of the transform element but with no sink
> in the pipe, the pipe does not execute.
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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[Prabhakar Lad]

On Fri, Jan 18, 2019 at 4:58 PM Nicolas Dufresne <[hidden email]> wrote:

>
> Le vendredi 18 janvier 2019 à 07:27 -0600, geospatialdeveloper a
> écrit :
> > So I have a simple pipeline with a custom source element that reads a Tiff
> > file, a custom transform element that applies an algorithm to the pixels
> > read in and a sink element that writes out a new Tiff file. This pipeline
> > works.
> >
> > I'm trying to write a shared library to have a function that will load the
> > pipe in memory but instead of the sink element writing out the Tiff file
> > will write the data into a memory location so that applications using the
> > shared library can call the function and have access to the processed
> > pixels.
>
> Then use appsink I would say.
>

Or even shmsink.

Cheers,
--Prabhakar
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