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54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*
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* FFV1 codec
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*
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* Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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static inline int RENAME(predict)(TYPE *src, TYPE *last)
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{
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const int LT = last[-1];
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const int T = last[0];
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const int L = src[-1];
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return mid_pred(L, L + T - LT, T);
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}
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static inline int RENAME(get_context)(const int16_t quant_table[MAX_CONTEXT_INPUTS][256],
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TYPE *src, TYPE *last, TYPE *last2)
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{
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const int LT = last[-1];
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const int T = last[0];
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const int RT = last[1];
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const int L = src[-1];
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if (quant_table[3][127] || quant_table[4][127]) {
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const int TT = last2[0];
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const int LL = src[-2];
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return quant_table[0][(L - LT) & 0xFF] +
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quant_table[1][(LT - T) & 0xFF] +
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quant_table[2][(T - RT) & 0xFF] +
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quant_table[3][(LL - L) & 0xFF] +
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quant_table[4][(TT - T) & 0xFF];
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} else
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return quant_table[0][(L - LT) & 0xFF] +
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quant_table[1][(LT - T) & 0xFF] +
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quant_table[2][(T - RT) & 0xFF];
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}
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