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63 lines
1.9 KiB
63 lines
1.9 KiB
/* |
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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 <stdint.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_x86(DCTContext *s); |
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void ff_fdct_ifast(int16_t *data); |
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void ff_fdct_ifast248(int16_t *data); |
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void ff_jpeg_fdct_islow_8(int16_t *data); |
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void ff_jpeg_fdct_islow_10(int16_t *data); |
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void ff_fdct248_islow_8(int16_t *data); |
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void ff_fdct248_islow_10(int16_t *data); |
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void ff_j_rev_dct(int16_t *data); |
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#endif /* AVCODEC_DCT_H */
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