Cannot use video.add_text since SDL init changes
------------------------------------------------
Key: LS-478
URL: http://dev.sourcefabric.org/browse/LS-478
Project: Liquidsoap
Issue Type: Bug
Components: Liquidsoap
Environment: current dev version
Reporter: David Baelde
Priority: Major
{{{
$ ./src/liquidsoap 'output.dummy(video.add_text("foo",blank()))'
Invalid value at line 1, char 28-42: Library not initialized.
}}}
The problem is that SDL is only initialized when streaming starts, just before
sources are woken up, but the text operator initializes its font upon creation
and not upon #wake_up. This in itself is (slightly) incorrect since resources
should only be allocated within #wake_up and #sleep, but it is useful to check
that the font exists.
The simplest solution is that all SDL operators call Sdl_utils.init which inits
with all options if not already done. The current architecture tries to do
better by not initializing components that don't need to. This is nice but I
don't see why it's necessary.
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