The code assumed that the value of the profile-restore field is
"default" for such profiles, but the C implementation is such
that the field is intentionally omitted in such case.
This resulted in incorrectly trying to restore such profiles. However,
there are no stored values with profile-restore=default, so it only
resulted in a harmless warning, but otherwise behaved correctly (i.e.
nothing is restored).
Fix the condition by taking into account that missing field means
"default", so that it doesn't try to restore in such case, and
avoid the warning.
Uses the mechanism introduced in the previous commit. The hope was to
make auto-profiles easier to use, and to get rid of the need for
manually created inverse profiles. Not sure if the end result is useful.
The property observation mechanism is fairly asynchronous to the player
core, and Lua scripts also are (they run in a separate thread). This may
sometimes lead to profiles being applied when it's too load.
For example, you may want to change network options depending on the
input URL - but most of these options would have to be set before the
HTTP access is made. But it could happen that the profile, and thus the
option, was applied at an slightly but arbitrary later time.
This is generally not fixable. But for the most important use-cases,
such as applying changes before media opening or playback
initialization, we can use some of the defined hooks.
Hooks make it synchronous again, by allowing API users (such as scripts)
to block the core because it continues with loading.
For this we simply don't continue a given hook, until we receive an idle
event, and have applied all changes. The idle event is in general used
to wait for property change notifications to settle down. Some of this
relies on the subtle ways guarantees are (maybe) given. See commit
ba70b150fb for the messy details. I'm not quite sure whether it
actually works, because I can't be bothered to read and understand my
bullshit from half a year ago. Should provide at least some improvement,
though.
This is taken from a somewhat older proof-of-concept script. The basic
idea, and most of the implementation, is still the same. The way the
profiles are actually defined changed.
I still feel bad about this being a Lua script, and running user
expressions as Lua code in a vaguely defined environment, but I guess as
far as balance of effort/maintenance/results goes, this is fine.
It's a bit bloated (the Lua scripting state is at least 150KB or so in
total), so in order to enable this by default, I decided it should
unload itself by default if no auto-profiles are used. (And currently,
it does not actually rescan the profile list if a new config file is
loaded some time later, so the script would do nothing anyway if no auto
profiles were defined.)
This still requires defining inverse profiles for "unapplying" a
profile. Also this is still somewhat racy. Both will probably be
alleviated to some degree in the future.
CogentRedTester
Philip Sequeira
wm4