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

[Nicolas Dufresne]

Le sam. 18 juill. 2020 10 h 00, Psychesnet Hsieh <psychesnet at gmail.com> a
écrit :

> 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.
>

In this case, services are separate process ?

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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