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/*
* Pure Data Packet system implementation.
* Copyright (c) by Tom Schouten <tom@zwizwa.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* this file contains misc communication methods */
#ifndef PDP_COMM_H
#define PDP_COMM_H
#include "pdp_symbol.h"
#include "pdp_list.h"
/* all symbols are C style */
#ifdef __cplusplus
extern "C"
{
#endif
/* pdp's pd symbols for communication
don't use these directly!!
use the macros instead, in case
this is proven to be too much of a hack..
it's too much of a hack. getting rid of them.
*/
#define PDP_SYMBOL_HACK 0
#if PDP_SYMBOL_HACK
extern t_symbol s_pdp;
extern t_symbol s_register_ro;
extern t_symbol s_register_rw;
extern t_symbol s_process;
extern t_symbol s_dpd;
extern t_symbol s_inspect;
extern t_symbol s_accumulate;
extern t_symbol s_chanmask;
#define S_PDP &s_pdp
#define S_REGISTER_RO &s_register_ro
#define S_REGISTER_RW &s_register_rw
#define S_PROCESS &s_process
#define S_DPD &s_dpd
#define S_INSPECT &s_inspect
#define S_ACCUMULATE &s_accumulate
#define S_CHANMASK &s_chanmask
#else
#define S_PDP gensym("pdp")
#define S_REGISTER_RO gensym("register_ro")
#define S_REGISTER_RW gensym("register_rw")
#define S_PROCESS gensym("process")
#define S_DPD gensym("dpd")
#define S_INSPECT gensym("inspect")
#define S_ACCUMULATE gensym("accumulate")
#define S_CHANMASK gensym("chanmask")
#endif
/* utility methods */
/* if packet is valid, mark it unused and send it to an outlet */
void pdp_packet_pass_if_valid(t_outlet *outlet, int *packet);
/* if source packet is valid, release dest packet and move src->dest */
void pdp_packet_replace_if_valid(int *dpacket, int *spacket);
/* copy_ro if dest packet if invalid, else drop source
(don't copy) + send drop notif to pdp system
returns 1 if dropped, 0 if copied */
int pdp_packet_copy_ro_or_drop(int *dpacket, int spacket);
int pdp_packet_convert_ro_or_drop(int *dpacket, int spacket, t_pdp_symbol *type_template);
/* copy_rw if dest packit is invalid, else drop source
(don't copy) + send drop notif to pdp system
returns 1 if dropped, zero if copied */
int pdp_packet_copy_rw_or_drop(int *dpacket, int spacket);
int pdp_packet_convert_rw_or_drop(int *dpacket, int spacket, t_pdp_symbol *type_template);
/* pd and pdp conversion stuff */
void pd_atom_to_pdp_atom(t_atom *pdatom, t_pdp_atom *pdpatom);
/* send pdp lists and atoms */
void outlet_pdp_atom(t_outlet *out, struct _pdp_atom *a);
void outlet_pdp_list(t_outlet *out, struct _pdp_list *l);
/* send a packet to an outlet: it is only legal to call this on a "passing packet"
or a "read only packet".
this means it is illegal to change a packet after you have passed it to others,
since this would mess up all read only references to the packet.
*/
/* this seems like a nice place to hide a comment on the notion of read/write in pdp
which packets are writable? all packets with exactly 1 user. this includes all packets
aquired with pdp_packet_*_rw or a constructor, and all packets that are not registered
after being sent out by outlet_pdp.
which packets are readable? all packets */
void outlet_pdp(t_outlet *out, int packetid);
/* send an accumulation (context) packet to an outlet. this is for usage in the dpd
base class. */
void outlet_dpd(t_outlet *out, int packetid);
#ifdef __cplusplus
}
#endif
#endif
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