21 Jan
2003
21 Jan
'03
12:16 p.m.
On Tuesday 21 January 2003 10.18, Steve Harris wrote:
On Tue, Jan 21, 2003 at 05:09:34 +0100, David Olofson
wrote:
It's not hard, but I didn't like the way it looked in Audiality's EG,
and I don't like the logical glitch that is a broken duration 0.
With only RAMP events and RAMP(value, 0) as a special case on the
receiver end, the EG code is nice and simple, and the receiver end
if() is trivial.
I could just test for 0 duration in the EG, but the only really
straightforward solution would be to delay for an extra frame, which
would effectively make a 0 duration stage take one frame too many ==>
timing error build-up. Then I would need to shorten the next section
by 1 - but what happens if the next section is 0 or 1 frames...?
I don't feel like I need that when I'm adding multiplication with
ramped input - and this is still pretty basic event processing! :-)
For example, setting the initial level of an
envelope and then
setting up the delay or attack phase won't work, unless you wait
for one frame before sending the RAMP event for the delay or
attack phase. Similarly, an attack duration of 0 would result in
the decay starting at the current value, instead of the attack
peak level.
Yes, you're right. Damn.
OTOH If we define that RAMP events arring in the same timestamp for
the same control override each other then it becomes the hosts job
to normalise them (not a hard task). Envelope sections with 0 duration are often not
provided anyway.
They definitely generate nasty clicks, but setting the initial level
of an envelope higher than 0 generally doesn't, unless the waveform
starts with a click. Anyway, this isn't as much of an issue as the
special-casing needed in senders, I think.
//David Olofson - Programmer, Composer, Open Source Advocate
.- The Return of Audiality! --------------------------------.
| Free/Open Source Audio Engine for use in Games or Studio. |
| RT and off-line synth. Scripting. Sample accurate timing. |
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