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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/>.
*/
#ifndef MUTIL_H
#define MUTIL_H
/* TODO: Move to main repo? */
#include "melisma.h"
#include <lauxlib.h>
#define MUTIL_OUTPUT_CHANNEL_FUNCTION "__ml_out"
static ml_channel *mutil_get_optchannel(lua_State *s, int i)
{
ml_channel **c;
if ((c = luaL_testudata(s,i,MELISMA_OUTPUT_CHANNEL_TYPENAME)) != NULL)
{
return *c;
}
lua_getfield(s,i,MUTIL_OUTPUT_CHANNEL_FUNCTION);
if (!lua_isfunction(s,-1))
{
lua_pop(s,1);
return NULL;
}
lua_pushvalue(s,i);
lua_call(s,1,1);
if ((c = luaL_testudata(s,-1,MELISMA_OUTPUT_CHANNEL_TYPENAME)) != NULL)
{
lua_pop(s,1);
return *c;
}
lua_pop(s,1);
return NULL;
}
static ml_channel *mutil_get_channel(lua_State *s, int i)
{
ml_channel *c = mutil_get_optchannel(s,i);
if (c == NULL)
{
luaL_argerror(s,i,"expected output channel");
}
return c;
}
#endif
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