Emit a signal to an element

[ivan-perez]

Hello, good morning

I have a pipeline written into a C program which redirects a video stream from stdin to multiple UDP clients. I want those clients to be added or removed dynamically, so it's not possible to define at compile time which of them and how many there will be. This is my pipeline (if I add a fixed clients parameter it works fine):

    fdsrc name=origin \
    ! video/x-h264,width=320,height=240,framerate=30/1,profile=baseline,stream-    format=avc,alignment=au \
    ! h264parse \
    ! rtph264pay \
        config-interval=1 \
        pt=96 \
    ! multiudpsink name=dest \
         sync=false

According to the GStreamer docs, I can achieve it by sending a signal in order to add or remove clients dynamically. In this case, it should be the add signal - https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-multiudpsink.html#GstMultiUDPSink-add

But I can't find any information about sending a signal to an element (in this case, to the multiudpsink element). It's easy to get the reference to my element:

    GstElement *sink = gst_bin_get_by_name(GST_BIN(pipeline), "dest");
    /* TODO: send a signal to add a client */
    g_object_unref(sink);

But now how can I emit a signal to that element?

Thanks in advance! Kind regards,

[Tim Müller]

On Thu, 2017-01-26 at 01:59 -0800, ivan-perez wrote:

Hi,

According to the GStreamer docs, I can achieve it by sending a signal

in order to add or remove clients dynamically. In this case, it should be the add signal -

https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-multiudpsink.html#GstMultiUDPSink-add

But I can't find any information about sending a signal to an element (in this case, to the multiudpsink element). It's easy to get the reference to my element:

    GstElement *sink = gst_bin_get_by_name(GST_BIN(pipeline), "dest");

    /* TODO: send a signal to add a client */

    g_object_unref(sink);

But now how can I emit a signal to that element?

Thanks in advance! Kind regards,

Here are some examples:

https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/tests/check/elements/udpsink.c#n158

Cheers

-Tim

-- 

Tim Müller, Centricular Ltd - http://www.centricular.com

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[ivan-perez]

Tim Müller wrote

On Thu, 2017-01-26 at 01:59 -0800, ivan-perez wrote:

Hi,

> According to the GStreamer docs, I can achieve it by sending a signal
> in order to add or remove clients dynamically. In this case, it
> should be the add signal -
> https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins
> -good-plugins/html/gst-plugins-good-plugins-
> multiudpsink.html#GstMultiUDPSink-add
>
> But I can't find any information about sending a signal to an element
> (in this case, to the multiudpsink element). It's easy to get the
> reference to my element:
>
>     GstElement *sink = gst_bin_get_by_name(GST_BIN(pipeline),
> "dest");
>     /* TODO: send a signal to add a client */
>     g_object_unref(sink);
>
> But now how can I emit a signal to that element?
>
> Thanks in advance! Kind regards,

Here are some examples:
https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/tests/chec
k/elements/udpsink.c#n158

Cheers
 -Tim


-- 
Tim Müller, Centricular Ltd - http://www.centricular.com

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Thank you very much, Tim.

Those examples allowed me to get fixed my problem. It was as simple as `g_signal_emit_by_name(upd_sink, "add", client_ip, client_port, NULL);`

Thanks again!