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/*
* 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][MAX_QUANT_TABLE_SIZE],
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) & MAX_QUANT_TABLE_MASK] +
quant_table[1][(LT - T) & MAX_QUANT_TABLE_MASK] +
quant_table[2][(T - RT) & MAX_QUANT_TABLE_MASK] +
quant_table[3][(LL - L) & MAX_QUANT_TABLE_MASK] +
quant_table[4][(TT - T) & MAX_QUANT_TABLE_MASK];
} else
return quant_table[0][(L - LT) & MAX_QUANT_TABLE_MASK] +
quant_table[1][(LT - T) & MAX_QUANT_TABLE_MASK] +
quant_table[2][(T - RT) & MAX_QUANT_TABLE_MASK];
}
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