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- /*
- * VC-1 and WMV3 decoder
- * Copyright (c) 2006-2007 Konstantin Shishkov
- * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #ifndef AVCODEC_VC1_PRED_H
- #define AVCODEC_VC1_PRED_H
- #include "vc1.h"
- #include "vc1data.h"
- void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
- int mv1, int r_x, int r_y, uint8_t* is_intra,
- int pred_flag, int dir);
- void ff_vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,
- int mvn, int r_x, int r_y, uint8_t* is_intra,
- int dir);
- void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],
- int direct, int mvtype);
- void ff_vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y,
- int mv1, int *pred_flag);
- static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)
- {
- int n = bfrac;
- #if B_FRACTION_DEN==256
- if (inv)
- n -= 256;
- if (!qs)
- return 2 * ((value * n + 255) >> 9);
- return (value * n + 128) >> 8;
- #else
- if (inv)
- n -= B_FRACTION_DEN;
- if (!qs)
- return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
- return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
- #endif
- }
- #endif /* AVCODEC_VC1_PRED_H */
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