gst_element_send_event - textoverlay

[Julien Isorce]

Hi

I would like to know if gst_element_send_event is thread safe ?

Actually I want to set the textoverlay's property "text" from an other thread than the main thread.
Is there an existing event which can do that ? If it doest not already exist, do you have an example that shows how to create an textEvent (then i call : gst_element_send_event( textoverlayElement, textEvent)

Thx

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[Michael Smith-32]

On Mon, 2008-03-17 at 19:01 +0100, Julien Isorce wrote:
> Hi
>
> I would like to know if gst_element_send_event is thread safe ?
>
> Actually I want to set the textoverlay's property "text" from an other
> thread than the main thread.
> Is there an existing event which can do that ? If it doest not already
> exist, do you have an example that shows how to create an textEvent
> (then i call : gst_element_send_event( textoverlayElement, textEvent)

Hi Julien,

This is nothing to do with events at all, then.

You should just set this property using g_object_set(), like you would
for any other property. Doing this from a different thread should be
fine.

Some elements ignore changes to properties while they're running,
though. I didn't check to see if textoverlay is one of them.

Mike

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[Tim-Philipp Müller-2]

On Mon, 2008-03-17 at 19:01 +0100, Julien Isorce wrote:

> I would like to know if gst_element_send_event is thread safe ?
>
> Actually I want to set the textoverlay's property "text" from an other
> thread than the main thread.
> Is there an existing event which can do that ? If it doest not already
> exist, do you have an example that shows how to create an textEvent
> (then i call : gst_element_send_event( textoverlayElement, textEvent)

Events have nothing to do with it at all. You should be able to just do

  g_object_set (textoverlay, "text", "new-text", NULL);

It's the element's responsibility to do proper locking internally (which
textoverlay does, I think).

 Cheers
  -Tim



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[Wim Taymans]

On Mon, 2008-03-17 at 19:01 +0100, Julien Isorce wrote:
> Hi
>
> I would like to know if gst_element_send_event is thread safe ?

The -core implementations are threadsafe. If this is actually threadsafe
for a particular element depends on the element.

>
> Actually I want to set the textoverlay's property "text" from an other
> thread than the main thread.

The text property does not seem to be threadsafe from looking at the
code. It also probably does not do what you think it does.

> Is there an existing event which can do that ? If it doest not already
> exist, do you have an example that shows how to create an textEvent
> (then i call : gst_element_send_event( textoverlayElement, textEvent)

We don't have any text events, what would you use them for?

Wim
>
> Thx
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