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Uses the fact that 4*480*480 == 225 << 12, and the identity
(a*b)>>n == (a>>n)*b + ((a%(1<<n))*b)>>n (assuming non-overflowing math),
except the rhs uses smaller intermediate values and does not overflow(*).
Compared to the original code, this uses 1 fewer division and eliminates
the rounding error.
(*) Technical note: In some cases the right hand side of the above
identity still has possibilities of intermediate overflow, but only if
b > (1 << n), or if (b << n) overflows, neither of which are true here.
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After listening to the original music in a Mac emulator (which
unfortunately doesn't handle the music very well), I can only
conclude that note value 1 means the note should continue playing.
At first I thought maybe it was supposed to fade the current note,
or perhaps change its volume, but I can't hear any traces of
either. So I'm going to assume it just means "hold the current
note", though for the life of me I cannot think of any valid
reason for such a command. So it may be wrong, but it sounds
closer to the emulator than it did before.
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Some notes in the main theme are very staccato, and this could
possibly explain why.
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I completely forgot to delete the dummy iMUSE object after using it
to skip over the old music save information. Thanks to Lordhoto for
pointing this out.
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Initialise _channel[] even when the instruments aren't available.
Otherwise, ScummVM will crash in a number of places including,
but not limited to, when loading savegames.
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After some discussion on #scummvm, the player now locks the sound
resource while the music is playing. This prevents the resource
manager from expiring the resource, which at best could cause
music to restart where it shouldn't.. At worst, I guess it could
have crashed, but I never saw that happen.
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It shouldn't make any real difference, but it's probably more
formally correct.
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In looped music, prevent the music channels from drifting out of
sync over time. This was noticeable after a few minutes in the
SCUMM Bar. We do this by extending the last note (which is just
zeroes, so we didn't even use to play it) so that it has the
exact number of samples needed to make all channels the exact
same length. (This is calculated when the music is loaded, so it
does not need any extra data in the save games, thankfully.)
As a result, the getNextNote() is now responsible for converting
the duration to number of samples (out of necessity) and for
converting the note to a pitch modifier (out of symmetry). I made
several false starts before I realized how much easier it would
be this way.
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At least on my computer, when the note ended abruptly there would
be an annoying "pop" at the end. This was particularly noticeable
at the end of the distaff notes in Loom. To get around this, fade
out the last 100 samples. There's nothing magical about 100 in
particular, but it's a nice even number and it should be short
enough that it's never a noticeable part of the note, even at low
sample rates.
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It was the remains of an experiment and no longer serves a purpose.
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This keeps the music from breaking when loading a savegame that was
made with a different sample rate than the current one. It also
breaks all savegames made in the past eight hours, but I don't think
it's necessary to maintain savegame compatibility within a pull
request, as long as it still works with savegames made before it.
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For old savegames, we now use a "dummy" iMUSE objet to skip the old
iMUSE save state. I had hoped to be able to do this without making
any changes to the iMUSE code itself, but I was unable to.
Also added note about how the save state for the new music will not
quite work if the mixer output rate changes. Personally, I'm not
too worried about that. It breaks, but it shouldn't break badly.
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Note that while this removes _townsPlayer->saveLoadWithSerializer(s)
it really shouldn't break anything because _musicEngine also points
to the FM Towns player. Famous last words...
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Apparently we cannot (portably) call virtual functions from the
constructor, so initialization has been moved to a separate function.
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Excplicitly cast to int to avoid a warning that I don't get, but
which clone2727 does. At least, I hope it avoids the warning.
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The Monkey Island and Loom mac music is really quite similar. The
data layout is a bit different, but most of the code was easy to
separate into its own class. The Loom player doesn't do looped music
but I don't remember off-hand if it ever should.
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