[ scummvm-Bugs-949760 ] COMI: Music is stuttering. Again

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Bugs item #949760, was opened at 2004-05-07 12:02
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https://sourceforge.net/tracker/?func=detail&atid=418820&aid=949760&group_id=37116

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Torbjörn Andersson (eriktorbjorn)
Assigned to: Nobody/Anonymous (nobody)
Summary: COMI: Music is stuttering. Again

Initial Comment:
A few days ago, I told aquadran on #scummvm that the
COMI music was stuttering. (As well as the FT and Dig
music.) There was some experimenting, the bug went away
and everyone was happy. Or at least I was.

Using today's snapshot, I noticed that the bug was back
again: regular buffer underruns, from the sound of it.
I added some debugging output to the part of the code
where it checks bufferMin against bufferUsage. This was
the pattern I saw:

bufferMin: 8820 bufferUsage: 0
bufferMin: 8820 bufferUsage: 8820
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 0
bufferMin: 8820 bufferUsage: 8820
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 0
bufferMin: 8820 bufferUsage: 8820
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640
bufferMin: 8820 bufferUsage: 17640

So the buffer usage is hovering at 17640 for a while
when it suddenly, without any warning becomes 0. At
this point it's gradually pumped up to 17640 again.
This looks pretty strange to me. I'm guessing that the
bufferUsage calculation isn't as good as it ought to be...


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