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/*
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 * (I)DCT Transforms
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 * Copyright (c) 2009 Peter Ross <pross@xvid.org>
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 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
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 * Copyright (c) 2010 Vitor Sessak
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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 St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#ifndef AVCODEC_DCT_H
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#define AVCODEC_DCT_H
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#include "rdft.h"
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struct DCTContext {
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    int nbits;
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    int inverse;
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    RDFTContext rdft;
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    const float *costab;
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    FFTSample *csc2;
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    void (*dct_calc)(struct DCTContext *s, FFTSample *data);
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    void (*dct32)(FFTSample *out, const FFTSample *in);
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};
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/**
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 * Set up DCT.
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 * @param nbits           size of the input array:
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 *                        (1 << nbits)     for DCT-II, DCT-III and DST-I
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 *                        (1 << nbits) + 1 for DCT-I
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 *
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 * @note the first element of the input of DST-I is ignored
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 */
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int  ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);
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void ff_dct_end (DCTContext *s);
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void ff_dct_init_mmx(DCTContext *s);
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#endif