PeerStreamer

/*

 * (I)DCT Transforms

 * Copyright (c) 2009 Peter Ross <pross@xvid.org>

 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>

 * Copyright (c) 2010 Vitor Sessak

 *

 * This file is part of Libav.

 *

 * Libav is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * Libav 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifndef AVCODEC_DCT_H

#define AVCODEC_DCT_H

#include "rdft.h"

struct DCTContext {

    int nbits;

    int inverse;

    RDFTContext rdft;

    const float *costab;

    FFTSample *csc2;

    void (*dct_calc)(struct DCTContext *s, FFTSample *data);

    void (*dct32)(FFTSample *out, const FFTSample *in);

};

/**

 * Set up DCT.

 * @param nbits           size of the input array:

 *                        (1 << nbits)     for DCT-II, DCT-III and DST-I

 *                        (1 << nbits) + 1 for DCT-I

 *

 * @note the first element of the input of DST-I is ignored

 */

int  ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);

void ff_dct_end (DCTContext *s);

void ff_dct_init_mmx(DCTContext *s);

#endif