00001 /* 00002 * (I)DCT Transforms 00003 * Copyright (c) 2009 Peter Ross <pross@xvid.org> 00004 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com> 00005 * Copyright (c) 2010 Vitor Sessak 00006 * 00007 * This file is part of FFmpeg. 00008 * 00009 * FFmpeg is free software; you can redistribute it and/or 00010 * modify it under the terms of the GNU Lesser General Public 00011 * License as published by the Free Software Foundation; either 00012 * version 2.1 of the License, or (at your option) any later version. 00013 * 00014 * FFmpeg is distributed in the hope that it will be useful, 00015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 * Lesser General Public License for more details. 00018 * 00019 * You should have received a copy of the GNU Lesser General Public 00020 * License along with FFmpeg; if not, write to the Free Software 00021 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00022 */ 00023 00024 #ifndef AVCODEC_DCT_H 00025 #define AVCODEC_DCT_H 00026 00027 #include "rdft.h" 00028 00029 struct DCTContext { 00030 int nbits; 00031 int inverse; 00032 RDFTContext rdft; 00033 const float *costab; 00034 FFTSample *csc2; 00035 void (*dct_calc)(struct DCTContext *s, FFTSample *data); 00036 void (*dct32)(FFTSample *out, const FFTSample *in); 00037 }; 00038 00047 int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type); 00048 void ff_dct_end (DCTContext *s); 00049 00050 void ff_dct_init_mmx(DCTContext *s); 00051 00052 #endif /* AVCODEC_DCT_H */
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