60 lines
2 KiB
C
60 lines
2 KiB
C
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/*
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* VC-1 and WMV3 decoder
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* Copyright (c) 2006-2007 Konstantin Shishkov
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* Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
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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 Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_VC1_PRED_H
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#define AVCODEC_VC1_PRED_H
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#include "vc1.h"
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#include "vc1data.h"
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void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
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int mv1, int r_x, int r_y, uint8_t* is_intra,
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int pred_flag, int dir);
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void ff_vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,
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int mvn, int r_x, int r_y, uint8_t* is_intra,
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int dir);
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void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],
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int direct, int mvtype);
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void ff_vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y,
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int mv1, int *pred_flag);
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static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)
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{
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int n = bfrac;
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#if B_FRACTION_DEN==256
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if (inv)
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n -= 256;
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if (!qs)
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return 2 * ((value * n + 255) >> 9);
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return (value * n + 128) >> 8;
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#else
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if (inv)
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n -= B_FRACTION_DEN;
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if (!qs)
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return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
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return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
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#endif
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}
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#endif /* AVCODEC_VC1_PRED_H */
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