[CM] clm4

Rick Taube taube at uiuc.edu
Thu, 7 Feb 2008 12:58:34 -0600

if another version of clm is in the works, one thing that would be  
really nice ( from my perspective...) would be for definstrument to  
generete a .c file in which all the instrument allocation is moved to  
the C side. that way there is no lisp fasl, you just load libclm then  
compile it to a .so file, load it, and then call the entry points  
(say fm_violin ) and pass floats or int parameter values from lisp  
(or whatever language you are working with.) .Im not sure how  
envelopes could be passed, maybe as strings. or maybe you simply pass  
ALL param values as a string that the C side parses, ie when  
definstrument generated the C code it would examine the formals and  
output C code that would parse a string containing possible input:

void fm_violin( char * input) {
   float beg = parse_required(input, 1, 0.0);
   float dur = parse_required(intput, 2, .5);
   env ampenv = parse_keyword(input, "ampenv:", {0, 1, 100, 1});
   for (i=time_to_samp(beg, SRATE); i< time_to_samp(end, SRATE); i++)
     outa(oscil( ...))

regardless, all the current lisp ffi code would go away and a  
compiled ins it could be loaded into any in any environment that  
allowed .so loading and string passing. people  could then define  
their own scheme funcs to provided keyword args  etc:

(load "libclm.so")
(load "v.so")

(defun fm-violin (beg dur pitch amp . args)
   ( fm_violin (args-to-string beg dur pitch amp args) ))

or to be a bit fancier,  a definstument would genreate two files,  
a .c file and  a .lisp or .scm file that defines a lispy wrapper. but  
neither the (definsturment ) nor the lisp wrapper it generates needs  
to be compiled by lisp, just evalled.