HI all,
I'm unclear why you'd want to do this... if it's to change parameters to DSP objects, that's better done by storing them as state variables; example, lop~ cutoff frequency change.
cheers Miller
On Fri, Nov 16, 2001 at 01:42:16AM +0100, Yves Degoyon wrote:
hi list, hi miller,
I've made a little patch to enable externs to modify the dsp chain while the dsp processing is running... this avoids to restart dsp processing when a parameter is changed, this is illustrated by the "spigot~" extern attached.
Without this patch, I had to restart dsp processing and all other dsp objects got interrupted. That was really annoying !!!
What was made basically was adding the following code :
d_ugen.c :
################################################ /* function to dynamically change dsp functions parameters arguments are : f : pointer to your dsp function rank : rank of the argument to change value : new value of this parameter
QUITE DANGEROUS !!! no checking is possible because the number of arguments is not stored in dsp_chain Copyleft ydegoyon@free.fr */void dsp_mod(t_perfroutine f, int rank, int value ) { va_list ap; t_int *pdsp_chain = dsp_chain; t_int i;
while ( pdsp_chain ){ if ( *pdsp_chain == (t_int)f ){ *(pdsp_chain+rank) = value; post ( "dsp_mod : warning : modifying dsp chain, better know what you're doing!!!!" ); break; } pdsp_chain++; }} ################################################
This function has to be exported in m_pd.h :
################################################ EXTERN void dsp_mod(t_perfroutine f, int rank, int value); ################################################
An example of use is available in spigot~.c attached.
This is really dangerous to use this, because it enables an extern to transform dsp_chain into a mess, so use it with care !!!
Cheers,
Yves Degoyon.
PS : it seems to be patch day, so I don't deliver this as a patch for incremental reasons ( I've applied some patches myself ).