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
27 #if HAVE_INLINE_ASM && HAVE_FAST_CMOV && HAVE_6REGS
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 low
= 1 + (((c
->high
- 1) * prob
) >> 8);
33 unsigned int low_shift
= low
<< 16;
35 c
->code_word
= code_word
;
43 : "+q"(bit
), "+&r"(c
->high
), "+&r"(c
->code_word
)
44 : "r"(low_shift
), "r"(low
), "r"(code_word
)
51 #endif /* AVCODEC_X86_VP56_ARITH_H */