[ scummvm-Patches-674141 ] CMI: Smush sync tuning (experimental)

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Fri Jan 24 18:01:44 CET 2003

Patches item #674141, was opened at 2003-01-24 18:01
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Torbjörn Andersson (eriktorbjorn)
Assigned to: Nobody/Anonymous (nobody)
Summary: CMI: Smush sync tuning (experimental)

Initial Comment:
This isn't quite complete, but I figured it was ready
to be submitted anyway. It's an attempt at getting
better sync for the CMI smush movies. The opening movie
in particular.

The problem with that movie is that we specify the
delay between the frames in milliseconds. This movie
consists of literally thousands of frames, so even an
error of a fraction of a millisecond adds up to
something quite noticeable by the end of it.

This patch changes the timer unit from milliseconds to
microseconds. Of course, we don't actually have that
high resolution timers so each individual frame delay
will still be off by many milliseconds. What it does is
to keep the error from accumulating as quickly over time.

What remains to be done that I'm aware of:

* MorphOS seems to have a completely different way of
handling timers than the other ScummVM ports. This
would obviously have to be updated.

* I've assumed that the CMI movies should be played
back at 12 fps, which means the delay between each
frame is approximately 83333 microseconds (instead of
the previous 83 microseconds). It seems to be working,
but perhaps it needs further fine-tuning?

* script_v6.cpp sets the delay between frames to 71000
microseconds for s3q.san. This could probably be
fine-tuned now, but I don't know if it's noticeable.

* Perhaps the "CD timer" could now be fine-tuned so
that it no longer uses a different delay for Loom CD?

* Perhaps there is some better way of syncing smush
movies that I'm not currently aware of?


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