Subject: [linux-audio-dev] XAP again - channels, etc.
From: Tim Hockin (thockin_AT_hockin.org)
Date: Fri Mar 21 2003 - 02:35:51 EET
I fear we've all been very busy. I know I have. I have not had time to
devote to XAP, though I have certainly not lost interest.
So today I start looking at my evolving spec doc again. The biggest chunk
of undecidedness lies in the area of Channels. We never really resolved the
Bays/Channels etc debate. We just put it off. Here it is.
I'd like to propose the following - it is simple and flexible. Not too
confusing.
Plugins define 'Modules'. Every plugin has a master Module, and 0-n extra
Modules. The host can instantiate Modules as needed. A Module is analogous
to a MIDI Channel in a synth (maybe Module is the wrong word). It is
analogous to a slot in a mixer.
struct XAP_descriptor {
...
/* master module descriptor */
XAP_module master;
/* other channel descriptors */
int n_modules;
XAP_module *modules;
/*
* Instantiate a module, return a plugin-unique
* id/index for it - it's 'Channel'.
*/
int (*add_module)(void *plugin, int module);
/*
* Remove a module.
*/
int (*del_module)(void *plugin, int index);
};
struct XAP_module {
char *label;
char *name;
uint32_t flags;
/* how many instances of this module are allowed? */
int count_max;
/* per-module controls and I/O */
int n_controls;
XAP_control **controls;
int n_ports;
XAP_port **ports;
};
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