Hi Istvan, 

Thanks for the information.  I didn't see that hfgens was already in
the ENVIRON struct.  I committed a version of the ftfree opcode an
hour or so ago that was in fgens.c and entry1.c.  I'll work on pushing
it and ftgens and whatever opcodes that use structs in ftgen.h out to
an opcode plugin.

I ended up making ftfree take both the number of the table to free as
well as freeTime parameter that if equal to 0 to free at opcode init,
and if not zero to free at deinit time.  Originally, I thought the
instrument I am translating had a temp array that was being generated
and free()'d in the code and then later realized it wasn't being used.
 Maybe it's better to simplify and just delete at deinit anyways?
(Maybe I'll take that option out then.)

Do you think it's better to have an ftgentemp opcode where the table
is always deleted at deinit, or better to explicitly call ftfree?  Is
there a use case where say, one instrument will generate a wavetable
and other instruments will use it for a while, then that instrument is
called again to generate a new ftable and free the old one?  Hmm...
maybe not, as you could always just overwrite a table assigned to a
global var.

Okay, sounds like an ftgentemp would be a good solution to all of
this.  I'll remove the ftfree opcode I put in and redo it all as an
opcode plugin.

Thanks!
steven


On 8/3/05, Istvan Varga <istvan_v@fibermail.hu> wrote:
> For freeing a table with a known number, you can just use csound->hfgens()
> with a negative table number which will request deleting the table, and
> this should work from plugins. Alternatively, it may make sense to write
> a version of the ftgen opcode that automatically deletes the table at
> note deinit. It should be possible to implement that opcode as a plugin
> (actually, ftgen may be moved out of fgens.c as well).
> 
> Steven Yi wrote:
> 
> > I'm working on ftree now and am putting it in fgens.c and adding a
> > struct to ftgen.h, and plan to add it to entry1.c.  or entry2.c,
> > wherever ftgen is at. The reason I'm doing this within csound and not
> > as a plugin is that I haven't found any API functions which can do
> > this.  I'm using the code from hfgens:
> >
> > if (ff->fno > csound->maxfnum ||
> >           (ftp = csound->flist[ff->fno]) == NULL) {
> >         fterror(csound, ff, Str("ftable does not exist"));
> >         return -1;
> >       }
> >       csound->flist[ff->fno] = NULL;
> >       mfree(csound, (void*) ftp);
> >
> > (with the ff->fno coming from *p instead) to free the table.  Does
> > this all sound alright or is there an API way to do this? (And if not,
> > should there be?)
> 
> 
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