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51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#endif
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