54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*
|
|
* FFV1 codec
|
|
*
|
|
* Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
static inline int RENAME(predict)(TYPE *src, TYPE *last)
|
|
{
|
|
const int LT = last[-1];
|
|
const int T = last[0];
|
|
const int L = src[-1];
|
|
|
|
return mid_pred(L, L + T - LT, T);
|
|
}
|
|
|
|
static inline int RENAME(get_context)(const int16_t quant_table[MAX_CONTEXT_INPUTS][256],
|
|
TYPE *src, TYPE *last, TYPE *last2)
|
|
{
|
|
const int LT = last[-1];
|
|
const int T = last[0];
|
|
const int RT = last[1];
|
|
const int L = src[-1];
|
|
|
|
if (quant_table[3][127] || quant_table[4][127]) {
|
|
const int TT = last2[0];
|
|
const int LL = src[-2];
|
|
return quant_table[0][(L - LT) & 0xFF] +
|
|
quant_table[1][(LT - T) & 0xFF] +
|
|
quant_table[2][(T - RT) & 0xFF] +
|
|
quant_table[3][(LL - L) & 0xFF] +
|
|
quant_table[4][(TT - T) & 0xFF];
|
|
} else
|
|
return quant_table[0][(L - LT) & 0xFF] +
|
|
quant_table[1][(LT - T) & 0xFF] +
|
|
quant_table[2][(T - RT) & 0xFF];
|
|
}
|
|
|