mirror of https://git.ffmpeg.org/ffmpeg.git
60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
|
/*
|
||
|
|
* 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 Libav.
|
||
|
|
*
|
||
|
|
* Libav 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.
|
||
|
|
*
|
||
|
|
* Libav 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 Libav; 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 */
|