Can gst_element_set_state() block?

Platform
1

There is no mention about this in the API.

The call blocks while trying to play files on 'smb://' when there are network issues.

Thanks!

2

It depends on your pipeline and specifically which elements are used. If there are elements that are doing blocking operations during the given state change, then the function would block for a while.

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3

So, why not make the code within 'gst_element_set_state ()' async always, and tell the user to look for 'GST_MESSAGE_STATE_CHANGED' message on the bus.

Thanks!

4

That’s one of the things I want to do for GStreamer 2.0 (whenever that happens): make all state changes async, always.

But that’s not how things are currently. If you need state changes to happen asynchronously then you need to do them from a different thread. Depending on the language you’re using, this can be trivial or a bit more work.

gst_element_call_async() (which uses a threadpool) can be used for this, for example.

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