aac5773f
 hucm
功能基本完成，接口待打磨
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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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