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ffmpeg / libavcodec / cbrt_tablegen.h @ 2912e87a

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/*
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 * Header file for hardcoded AAC cube-root table
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 *
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 * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef CBRT_TABLEGEN_H
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#define CBRT_TABLEGEN_H
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#include <stdint.h>
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#include <math.h>
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#if CONFIG_HARDCODED_TABLES
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#define cbrt_tableinit()
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#include "libavcodec/cbrt_tables.h"
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#else
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static uint32_t cbrt_tab[1 << 13];
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static void cbrt_tableinit(void)
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{
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    if (!cbrt_tab[(1<<13) - 1]) {
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        int i;
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        for (i = 0; i < 1<<13; i++) {
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            union {
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                float f;
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                uint32_t i;
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            } f;
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            f.f = cbrtf(i) * i;
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            cbrt_tab[i] = f.i;
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        }
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    }
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}
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#endif /* CONFIG_HARDCODED_TABLES */
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#endif /* CBRT_TABLEGEN_H */