Subject: Re: [linux-audio-dev] Sequencer Sync Woes
From: Paul Davis (pbd_AT_Op.Net)
Date: Wed Feb 07 2001 - 20:42:07 EET
>> i must be missing something or do both of you assume the song tempo is
>> constant?
>
> Of course not :) Every time the tempo changes, I change
>usec_per_tick. That's the only thing that needs to change. You keep
>track of your current position, the time of the last beat (24ppq pulse,
>and only the last pulse), and that's it.
softwerk is a little different. first, song tempo *is* constant, since
there isn't really a tempo in the usual MIDI sense. and secondly,
softwerk has at least 2 distinct levels of timing:
internal-clock ticks
gate and interval units
i don't use the tired, worn out western notions of notes, bars, beats
etc ;)
>> i use double as the type of real time mostly out of laziness; do you
>> think there is too much computational overhead? one could switch to
>> uint.uint then. i don't even have an idea how many cycles a double /
>> takes ...
on x86, double is typically measured as adding about 6% to the cost in
a program that is already very float-math heavy.
--p
This archive was generated by hypermail 2b28 : Wed Feb 07 2001 - 21:08:20 EET