Query duration of many sound files in a loop

[Jiergir Ogoerg]

Hi,

I wanna query a lot of sound files duration in a loop efficiently, so
instead of waiting in a sub-loop with a sleep method until the query
succeeds for each given file - I wanna go for the second approach by
processing the GST_MESSAGE_ASYNC_DONE message on the bus, thus bypassing
the potential need to do (several) sleep(s) for each sound file.

How do I do it properly?
The only thing I can think about is launching the files query loop in a
different thread, from there for each file block on a condition variable
until I get the async event on the bus on the main thread which would fire
pthread_cond_signal() to unblock the querying thread to query the
corresponding file and move on to the next sound file in the loop.

Is there a better way to implement this non-sleep approach?

How do I know that GST_MESSAGE_ASYNC_DONE isn't fired by some other source
since gstreamer is multi-threaded and can work with many sound sources in
parallel so the events on the bus might be rather random, right?
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