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/*
* melisma - extensible and scriptable audio engine
* Copyright (C) 2026 Ludvig Gunne Lindström
*
* 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 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 <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <string.h>
#include <lua.h>
#include <lauxlib.h>
#include "melisma.h"
#include "mutil.h"
#define PASSTHROUGH_TYPENAME "passthrough"
static void proc(const ml_proc_args *args)
{
assert(args->icnt == 1);
assert(args->ocnt == 1);
memcpy(args->out[0],args->in[0],args->nframes*sizeof(float));
}
static int l_init(lua_State *s)
{
ml_channel *src = mutil_get_channel(s,1);
ml_node *node = ml_create_node(proc,NULL);
ml_label_node(node,"passthrough");
ml_channel *dst = ml_add_input(node);
ml_connect(src,dst);
(void) ml_add_output(node);
*(void**) lua_newuserdata(s,sizeof(void*)) = node;
luaL_setmetatable(s,PASSTHROUGH_TYPENAME);
return 1;
}
static int l_out(lua_State *s)
{
ml_node *node = *(void**) luaL_checkudata(s,1,PASSTHROUGH_TYPENAME);
*(void**) lua_newuserdata(s,sizeof(void*)) = ml_get_output(node,0);
luaL_setmetatable(s,MELISMA_OUTPUT_CHANNEL_TYPENAME);
return 1;
}
int luaopen_melisma_passthrough(lua_State *s)
{
ml_check_version();
lua_newtable(s);
int tbl = lua_gettop(s);
lua_pushcfunction(s,l_init);
lua_setfield(s,tbl,"init");
lua_pushcfunction(s,l_out);
lua_setfield(s,tbl,MUTIL_OUTPUT_CHANNEL_FUNCTION);
luaL_newmetatable(s,PASSTHROUGH_TYPENAME);
int mt = lua_gettop(s);
lua_pushvalue(s,tbl);
lua_setfield(s,mt,"__index");
lua_settop(s,tbl);
return 1;
}
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