Handling of QoS in a BaseTransform subclass
Jimmy De Pauw
jimmy at dcode.eu
Wed Dec 20 12:29:41 UTC 2017
I am almost certain that BaseTransform ignore QoS because it does not have any segment timing to work with.
Therefore i wonder if it is possible to have QoS when the main sink is filesrc with a test file.
Considering the following pipeline :
filesrc ! decodebin ! queue ! videoconvert ! <my plugin> ! jpegenc ! multifilesink
In the debug log i have only one « gst_base_transform_chain ... we have a pending DISCONT» but never twice.
I also never have a buffer dropped, looking at the code of GstBaseTransform i think this is because i don’t receive and segment information.
Is it possible to simulate a live feed from a video file with full QoS support so i can test my processing speed?
> On 18 Dec 2017, at 15:24, Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
>
>
>
> Le 18 déc. 2017 5:10 AM, "Jimmy De Pauw" <jimmy at dcode.eu <mailto:jimmy at dcode.eu>> a écrit :
> Hello,
>
> I have been creating my own plugin using GstBaseTransform as the parent class.
> It works find but now i want to handle the QoS in my tranform method to know if i have to drop the buffer or not.
>
> I can see that BaseTransform already listen to QoS event on its sink and set some properties in its priv structure.
> I would like to have access to the earliest_time property from my own transform method but i don’t know how to do it, if it is possible at all.
> It sounds like i have no access to it at all.
>
> Looking at the videoconvert source code i don’t see how it handles QoS eventl.
>
> It's entirely handled by the base class. But you can catch the event on your srcpad, there is virtual functions for that.
>
>
> What is the proper way of using what is already there in the BaseTransform class to handle QoS on my own subclass?
>
> Thanks
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