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authorwm4 <wm4@nowhere>2020-08-05 23:28:24 +0200
committerwm4 <wm4@nowhere>2020-08-05 23:28:24 +0200
commit53ee1ae4171a0ddfb5c9a965c404a18d93e82952 (patch)
tree536dff5f5c0daaf37edd323353187b19ee64776e /configure
parentd0ab562b1fb22490799f42f3f90b61f01b593bab (diff)
auto_profiles: register hooks for more synchronous profile application
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 ba70b150fbe 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.
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