appsrc example

[Bert Douglas]

Hi All,

I have question about "appsrc".
Rread the docs, and looked at examples here:
http://cgit.freedesktop.org/gstreamer/gst-plugins-base/tree/tests/examples/app

I have a python application using python gstreamer.

And I have a separate C application that reads raw rgb frames from a camera.

How do i hook the two apps together so the camera can act as a video source?

Is "appsrc" suited for this job?

Is it possible to send frames to appsrc?  Examples do not show this.

Another big issue is how to attach the appsrc element to a pipeline created in another program?

Thanks,
Bert Douglas




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[Sandeep Prakash]

Hi,

Bert Douglas wrote

How do i hook the two apps together so the camera can act as a video source?

Not sure how to do this in separate applications. But in the same application these are the steps:
1. First of all you have to get the appsrc GstElement object.
2. Then hook your function to the "need-data" callback of the appsrc. Do a gst-inspect of appsrc
to get the function prototype.
3. When the pipeline goes to PAUSED/PLAYING the callback is called. Here you can feed your camera data thru "gst_app_src_push_buffer". The buffer size in the call back is the blocksize. Set blocksize of appsrc to
the framesize of the raw buffer from camera.
4. You have set the appropriate caps on the src pad of the appsrc. Use capsfilter for this.

Bert Douglas wrote

Is "appsrc" suited for this job?

Yes

Bert Douglas wrote

Is it possible to send frames to appsrc?  Examples do not show this.

You can push any data thru appsrc as long as the downstream elements recognizes that data.

Bert Douglas wrote

Another big issue is how to attach the appsrc element to a pipeline created in another program?

Not sure on this.

Regards,
Sandeep
http://sandeepprakash.homeip.net

[Bert Douglas]

Thanks.

On Fri, Aug 27, 2010 at 10:52 AM, Sandeep Prakash <[hidden email]> wrote:

Hi,

Bert Douglas wrote:
>
> How do i hook the two apps together so the camera can act as a video
> source?
>

Not sure how to do this in separate applications. But in the same
application these are the steps:
1. First of all you have to get the appsrc GstElement object.
2. Then hook your function to the "need-data" callback of the appsrc. Do a
gst-inspect of appsrc
to get the function prototype.
3. When the pipeline goes to PAUSED/PLAYING the callback is called. Here you
can feed your camera data thru "gst_app_src_push_buffer". The buffer size in
the call back is the blocksize. Set blocksize of appsrc to
the framesize of the raw buffer from camera.
4. You have set the appropriate caps on the src pad of the appsrc. Use
capsfilter for this.

Bert Douglas wrote:
>
> Is "appsrc" suited for this job?
>

Yes

Bert Douglas wrote:
>
> Is it possible to send frames to appsrc?  Examples do not show this.
>

You can push any data thru appsrc as long as the downstream elements
recognizes that data.

Bert Douglas wrote:
>
> Another big issue is how to attach the appsrc element to a pipeline
> created in another program?
>

Not sure on this.

Regards,
Sandeep
http://sandeepprakash.homeip.net
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