audiounit - is it possible to enumerate Audio Unit parameter descriptions? -


is there way audio unit host step through plugin's parameters , gain such information as:

  • parameter name string e.g. "delay time"
  • parameter range (minimum, maximum)
  • parameter units (e.g. seconds)
  • parameter control (e.g. slider)

afaict information available in plugin, can't figure out how query host side.

you'll first need #import caauparameter , auparaminfo (which can found in /developer/extras/coreaudio/publicutility).

edit: these files found in "audio tools xcode" package. can going xcode > open developer tool > more developer tools...

assuming have audiounit called theunit following code set iterate through theunit's parameters:

bool includeexpert   = false; bool includereadonly = false;  auparaminfo info (theunit, includeexpert, includereadonly);   for(int = 0; < info.numparams(); i++) {     if(null != info.getparaminfo(i))     {         // things info here     } }

for example, info.getparaminfo(i))->paraminfo() give audiounitparameterinfo struct defined follows:

typedef struct audiounitparameterinfo {     char                        name[52];     cfstringref                 unitname;     uint32                      clumpid;     cfstringref                 cfnamestring;     audiounitparameterunit      unit;                            audiounitparametervalue     minvalue;                audiounitparametervalue     maxvalue;                audiounitparametervalue     defaultvalue;            uint32                      flags;               } audiounitparameterinfo;

note you'll need open audiounit first (eg. calling augraphopen() on graph contains unit).


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