mod player with some fixes is now committed in both the old dev attic
subdirectory and in the demo src.
fixes are for example:
* that arpeggio is now independent modulation of frequecy removing
some previous problems with arpeggio changing that actual note that
would result in a continously climbin arpeggio
* set sample position is now jumping to the right offset which fixes
the broken rythm of the demo mod.
* linear interpolation had the wrong order of the samples resulting in
a reverse and broken sawtooth-like interpolation
* a bunch of new interpolations added, should perhaps be software
selectable or at least compile-time selectable by defines but is now
only a bunch of #if 1 to enable and #if 0 to disable. they are:
floor - no interpolation - crispy sound with lots of aliasing
linear - that just makes a linear ramp between sample values - fast
cosine - which is not ready for use since it actually calls cos but
should do this with fixed point arithmetics
and perhaps a lookup table - sounds quite good though and will be
fast
cubic interpolation - which is broken
cubic 2 interpolation - which is a working 4-point cubic
interpolation - the currently enabled one - uses
64-bit ints now just because I haven't bothered yet about fitting
the fixed points to smallest ints.
hermite - which is not ready for use since it uses float, also it has
bias and tension configuration values
that are just at some basic defaults which it any research into
would give the best result
about declicking there is declicking for volume changes but not for
ending samples in the peak of a waveform or so. when a new sound is
started with an attack it's normally not audible if there is a click
of breaking the old playing sample on that channel since it is in the
attack of the new sound and in rythm as well. ending a sample on a
peak is not at all forgiving though and one way to remove most of this
is to make sure that the waveform ends at 0 instead of anywhere else
in the waveform.
we should probably add some form of declicking in these situations too
but it is not all obvious which is the best option because you don't
want to start a new sound with a ramping up however short, since you
might kill the attack of that sound, but you might want to ramp down
when stopping a sample...
/b
On 29 sep 2009, at 21.55, Sébastien Bourdeauducq wrote:
Hi,
I doubt we will be able to make it to MAIN#4, so I suggest we try
our chance
for Altparty (www.altparty.org) at the end of October in Helsinki. I
will be
able to get there (MAIN is way too much transportation/schedule
hassle for me)
and the program looks amazing. Of course, if we still have something
to show
for MAIN, that would still be very cool :)
Bengt's ML401 board is now operational, and he will be joining us
for the
graphics programming effort. The outline of what should be done is
available
at:
http://www.tmplab.org/wiki/index.php/DemoParty_Compo_with_MilkyMist
If you have any problem compiling the Mico32 toolchain for Mac OS,
just let us
know on this list and we will help you.
Also, please commit your fixes to the MOD player so that we can test
with the
latest song from Alban and get rid of the last bugs fast.
Thanks!
Sébastien
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