2 * VP5 and VP6 compatible video decoder (arith decoder)
4 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
5 * Copyright (C) 2010 Eli Friedman
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #ifndef AVCODEC_X86_VP56_ARITH_H
25 #define AVCODEC_X86_VP56_ARITH_H
28 #define vp56_rac_get_prob vp56_rac_get_prob
29 static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
31 unsigned int code_word = vp56_rac_renorm(c);
32 unsigned int high = c->high;
33 unsigned int low = 1 + (((high - 1) * prob) >> 8);
34 unsigned int low_shift = low << 16;
40 "leal (%2, %3), %3 \n\t"
44 : "+q"(bit), "+r"(high), "+r"(code_word), "+r"(low_shift)
49 c->code_word = code_word;
54 #endif /* AVCODEC_X86_VP56_ARITH_H */