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/*
* guile-osc.c
*
* Copyright © 2023 Thomas White <taw@bitwiz.org.uk>
*
* This file is part of Guile-OSC.
*
* Guile-OSC 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <libguile.h>
#include <lo/lo.h>
static SCM osc_server_type;
static SCM osc_method_type;
static void error_callback(int num, const char *msg, const char *path)
{
fprintf(stderr, "liblo error %i (%s) for path %s\n", num, msg, path);
}
static SCM start_osc()
{
lo_server_thread srv = lo_server_thread_new("7770", error_callback);
lo_server_thread_start(srv);
return scm_make_foreign_object_1(osc_server_type, srv);
}
static void finalize_osc_server(SCM obj)
{
lo_server_thread srv;
scm_assert_foreign_object_type(osc_server_type, obj);
srv = scm_foreign_object_ref(obj, 0);
lo_server_thread_free(srv);
}
struct method_callback_data
{
SCM proc;
};
/* This struct exists just to help get the method callback arguments
* into Guile mode */
struct method_callback_guile_data
{
const char *path;
const char *types;
lo_arg **argv;
int argc;
lo_message *msg;
void *vp;
};
static void *method_callback_with_guile(void *vp)
{
struct method_callback_guile_data *data = vp;
struct method_callback_data *mdata = data->vp;
scm_call_0(mdata->proc);
return NULL;
}
static int method_callback(const char *path, const char *types, lo_arg **argv,
int argc, lo_message msg, void *vp)
{
/* The OSC server thread is not under our control, and is not in
* Guile mode. Therefore, some "tedious mucking-about in hyperspace"
* is required before we can invoke the Scheme callback */
struct method_callback_guile_data cb_data;
cb_data.path = path;
cb_data.types = types;
cb_data.argv = argv;
cb_data.argc = argc;
cb_data.msg = msg;
cb_data.vp = vp;
scm_with_guile(method_callback_with_guile, &cb_data);
return 1;
}
static SCM define_osc_method(SCM server_obj, SCM path_obj, SCM proc)
{
lo_server_thread srv;
lo_method method;
char *path;
struct method_callback_data *data;
scm_assert_foreign_object_type(osc_server_type, server_obj);
srv = scm_foreign_object_ref(server_obj, 0);
data = malloc(sizeof(struct method_callback_data));
data->proc = proc;
scm_gc_protect_object(proc);
path = scm_to_utf8_stringn(path_obj, NULL);
method = lo_server_thread_add_method(srv, path, "",
method_callback, data);
free(path);
return scm_make_foreign_object_1(osc_method_type, method);
}
void init_guile_osc()
{
SCM name, slots;
name = scm_from_utf8_symbol("OSCServer");
slots = scm_list_1(scm_from_utf8_symbol("data"));
osc_server_type = scm_make_foreign_object_type(name,
slots,
finalize_osc_server);
name = scm_from_utf8_symbol("OSCMethod");
slots = scm_list_1(scm_from_utf8_symbol("data"));
osc_method_type = scm_make_foreign_object_type(name, slots, NULL);
scm_c_define_gsubr("start-osc", 0, 0, 0, start_osc);
scm_c_define_gsubr("define-osc-method", 3, 0, 0, define_osc_method);
scm_add_feature("guile-osc");
}
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