9 Dec
2002
9 Dec
'02
8:23 p.m.
Long context, sorry
OK, let me again see if I understand (sorry for being dense, something is
not clicking this week..)
// Normal case of host connecting to an event_port
Host somewhere:
evp = instrument->get_event_port(n);
vvid_max = instrument->alloc_vvids(evp, 256); /* should be enough! */
Plugin alloc_vvids:
/* make room for specified number of vvids, or what not */
return the requested # back, or negative on error
Host again:
store the number of VVIDs somehow - array/list
So how does a plugin controlling another plugin go?
Do let me see
if I get this right:
Host allocates the VVID pool (perhaps a bitmask or some other way
of indicating usage)
Host wants to send a VOICE_ON:
allocates an unused VVID
sends VOICE_ON with that VVID
when it sends a VOICE_OFF or receives a VOICE_OFF it can mark that
VVID as unused again.
It seems like this would be a host global matter... What would be the
point in that? All you need is a way to address Voices within *one
Channel* - you don't have to worry about other Plugins, or even other
Channels on the same Plugin. (For table based implementations,
plugins have one table per Channel, and for tag/search
implementations, you just tag Voices with VVIDs *and* Channel
indices.)
Plugin wants to send a VOICE_ON:
calls host->get_vvids(32)
host allocates it 32 VVIDs
You do this when the host tells you to connect to an event port, and
what you do is actually:
first_id = host->get_vvids(target_port, number_of_VVIDs);
if(first_id < 0)
give_up;
Note that the first_id thing is actually *only* needed when the host
connects multiple output ports to the same input port. Normally, it
will be 0.
The host will at some point ask the plugin, or rather *tell* the
plugin how many VVIDs are needed for each Event Input port it wants
to connect. Plugins may say
"I don't have Voices!"
(No need for VVIDs...)
or
"Anything that fits makes a fine VVID for me."
(Full 32 bit range, no actual allocation needed.
or
"I need internal tables. How many VVIDs do you need?"
(Host says N, and plugin allocates tables for N
VVIDs, addressed as 0..N-1.)