[ scummvm-Patches-1115053 ] smush_player performance patch

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Patches item #1115053, was opened at 2005-02-02 21:18
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: ole (ole00)
Assigned to: Nobody/Anonymous (nobody)
Summary: smush_player performance patch

Initial Comment:
Hello,

I have an update for the scumm smush_player and chunk
class. The old smush player was fairly excelent on fast
computers wheere seek / and transfer times are very
short. On the other hand if smush player was not fed
properly right from the start (mostly happens on
platforms where there is no read-ahead file caching,
and on  platforms where data transfer rate is slow -
flash disks etc.) then
the playback performace suffer. Another glitch
concerned the time-compression on the start of the
movie (first 2 or 3 seconds of the movie were missing -
or played back at once with stacked voice  streams) is
also solved.

This fix/update adds read-ahead caching to the chunk
class (I have created CachedFileChunk from the
FileChunk) and slightly modifies the smush_player.

I'm sorry that the source is attached here, but I have
no other easier way how to contribute.

Hope it will be usefull - if not, never mind :).

BTW. Why the chunk classes are passed as 'instance
copy' (Chunk &b) in the smush/saud methods and not as
the pointers (Chunk *b)? Maybe I'm wrong but this way
the system creates instance copies of the chunks each
time it is passed to another method which might be imho
quite memory/time consuming...

Ole

The source code is attached bellow....


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