[gst-devel] how to make gstreamer run in separate thread

[Stefan Kost]

4ernov wrote:
> Hi,
>
> I try to make whole gstreamer pipeline live in separate thread.
GStreamer already run the data processing in separate threads.

>  I need
> it generally because I work with very slow v4l2 device driver and it
> takes considerable time for to change state of pipeline (init driver
> etc.).
Are you synchronously waiting for the state change to happen? I wonder
if you just use things a bit sub optimal.

Stefan
>  So I create special QThread in Qt4 app and make all the
> construction work (i.e. create all the elements, the pipeline itself
> etc.) in its run() method. I also connect to the bus of the pipeline
> to get some info:
>
>         GstBus* bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
>         gst_bus_add_watch (bus, audio_bus_call, this);
>         gst_object_unref (bus);
>
> But I eventually found that all the message dispatching is processed
> in the main thread of the app. I.e. if I call thread() function which
> returns a pointer to a running thread in bus callback:
> void audio_bus_call()
> {
>         qDebug()<<"thread:"<<thread();
> }
> it returns a pointer to the main thread in spite of that all the
> GStreamer objects are created in different thread.
>
> Is there any way to make message dispatching process run in different
> thread other than main? Or somehow bind GStreamer event loop to Qt's
> event loop of some QThread object?
>
> Thank you very much,
>
> Alexey Chernov
>
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