I want to design a source element which can share video frames.

[Psychesnet Hsieh]

Hi Joshi,

Thanks. First of all, I think I need to describe my question more and we
can fully address what I need. Thanks.

CAPTURE  -> mmap -> service 1
                             | ----> service 2
                             | ----> service 3
Above layout, it is our design for now. We have CAPTURE which always
capture H264 video frames from DSP(via special ioctl, not v4l2).
There are a lot of server X can access H264 video frames at same time. The
middle interface is mmap. It is working now.

Now, we would like to design a source element and it can satisfy following
requirements.
1. All service X still can access H264 video frames at same time.
2. Gstreamer can work with this source element.
3. CAPTURE, for platform, we still need this part which capture H264 video
frames via ioctl.

@Joshi,

According to your reply, I think I still need to keep my mmap and create a
source element which can access mmap and delivery data through whole
pipeline, right?

Thanks. Have a good day. ^^

Mandar Joshi <emailmandar at gmail.com> 於 2020年7月17日 星期五寫道：

> Hi,
> I've done something similar recently. Could you please go through this
> discussion https://lists.freedesktop.org/archives/gstreamer-devel/2020-
> July/075481.html Since this is recent, I should be able to answer any
> queries you have about the approach.
>
> For your first question, this is my suggestion
> So, create a source element based on GstPushSrc (like neonhttpsrc) and in
> the _create function, the following should work.
> Map the buffer and write what you need to it. Make sure you set the SRC
> CAPS of the element to the correct ones so that a right element to
> decode/view the video data can be linked to the source element.
>
> For your second question, I don't think I completely understand it. But
> maybe the answer to the first question will allow you to come up with the
> answer to the second one.
>
> Feel free to ask any questions.
>
> Regards
> Mandar Joshi
> Czar Softech
> *https://www.czarsoftech.com <https://www.czarsoftech.com>*
>
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