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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 <string.h>
#include <lauxlib.h>
#include "melisma.h"
#include "mutil.h"
#define MIXER_TYPENAME "mixer"
static void proc(const ml_proc_args *args)
{
float *out = args->out[0];
memset(out,0,args->nframes * sizeof(out[0]));
for (size_t i = 0; i < args->icnt; i++)
{
const float *in = args->in[i];
for (size_t j = 0; j < args->nframes; j++)
{
out[j] += in[j];
}
}
}
static int l_init(lua_State *s)
{
int n = lua_gettop(s);
if (n == 0)
{
luaL_error(s,"need at least one input channel");
}
ml_node *node = ml_create_node(proc,NULL);
ml_label_node(node,"mix");
for (int i = 0; i < n; i++)
{
ml_channel *src = mutil_get_channel(s,i+1);
ml_channel *dst = ml_add_input(node);
ml_connect(src,dst);
}
ml_channel *out = ml_add_output(node);
*(void**) lua_newuserdata(s,sizeof(void*)) = out;
luaL_setmetatable(s,MIXER_TYPENAME);
return 1;
}
static int l_out(lua_State *s)
{
ml_channel *c = *(void**) luaL_checkudata(s,1,MIXER_TYPENAME);
*(void**) lua_newuserdata(s,sizeof(void*)) = c;
luaL_setmetatable(s,MELISMA_OUTPUT_CHANNEL_TYPENAME);
return 1;
}
int luaopen_melisma_mixer(lua_State *s)
{
ml_check_version();
/*** Mix signals.
local mmixer = require 'melisma.mixer'
local signals = ...
local mixer = mmixer.init(table.unpack(signals))
@classmod mixer
*/
lua_newtable(s);
int tbl = lua_gettop(s);
/*** Mix input signals in to a single output signal.
@static
@function init
@tparam channel ... Input signals.
@treturn mixer The newly created mixer unit.
*/
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,MIXER_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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