Event for maxAutoLevel change

[littlespex]

Is your feature request related to a problem? Please describe.

When capLevelToPlayerSize is enabled maxAutoLevel is dynamically set based on the player's dimensions. There is currently no way to know when the values changes besides polling for changes to player.maxAutoLevel. Knowing when the value changes is useful information when drawing a bitrate/level/quality selection menu.

Describe the solution you'd like

Fire an event when maxAutoLevel changes.

Additional context

The LEVELS_UPDATED event could be used for this use case, or a new event entirely.

[robwalch]

Not a Contribution

The LEVELS_UPDATED event could be used for this use case, or a new event entirely.

This would require a new event, as LEVELS_UPDATED should only fire when hls.levels changes (which only happens when removeLevel is called in level-controller).

There is a FPS_DROP_LEVEL_CAPPING event so following that convention a PLAYER_SIZE_LEVEL_CAPPING event would make sense, and would also trigger right before setting hls.autoLevelCapping and calling streamController.nextLevelSwitch() (although thinking about it events should fire after these changes, not before, but that's another issue).

[robwalch]

There is also a minAutoLevel so whatever event we come up should probably include the range. When these values change because of LEVELS_UPDATED the event should follow the LEVELS_UPDATED event OR the new event should include the updated levels array (since it could fire while LEVELS_UPDATED is still being dispatched).