[Scummvm-tracker] [ScummVM :: Bugs] #11513: frame/audio sync issues with SQ2 on 2gs

[ScummVM :: Bugs]

#11513: frame/audio sync issues with SQ2 on 2gs
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Reporter:  jpc-ae          |      Owner:  (none)
    Type:  defect          |     Status:  new
Priority:  normal          |  Component:  Engine: AGI
Keywords:  iigs 2gs cycle  |       Game:  Space Quest 2
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 This comes in a few flavours, it seems certain code is running to hot
 causing sync issues. To explain:

 When the ship enters the dock in the intro, certain letters show up too
 fast as if running at 30 cycles per second (cps), when it should be a
 steady 10, this may not matter so much, but is illustrative of the issue.

 The clearest case is with the sweeping scene in the opening, where the
 audio is clearly out of sync with the sweeping when it should be. I have
 attached a recording of it when run using mame (which currently provides
 the most accurate play experience but crackles terribly). Roger here
 sweeps at 5 cps. In ScummVM, Roger sweeps at the correct speed, but his
 body is seen moving at 10 cps (also attached, sorry for the extra
 blackspace) with the audio out of sync.

 My guess at what's happening is the audio is being triggered at twice the
 speed it should be, similar to how Roger's body is moving at twice the
 speed of his sweeping, causing sync issues. I also suspect that fixing
 this issue would help to address some of the other speed related issues
 sometimes seen on the Apple IIgs.
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Ticket URL: <https://bugs.scummvm.org/ticket/11513>
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