| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /** | ||
| 2 | * VP5 and VP6 compatible video decoder (arith decoder) | ||
| 3 | * | ||
| 4 | * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> | ||
| 5 | * Copyright (C) 2010 Eli Friedman | ||
| 6 | * | ||
| 7 | * This file is part of FFmpeg. | ||
| 8 | * | ||
| 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. | ||
| 13 | * | ||
| 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. | ||
| 18 | * | ||
| 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 | ||
| 22 | */ | ||
| 23 | |||
| 24 | #ifndef AVCODEC_X86_VPX_ARITH_H | ||
| 25 | #define AVCODEC_X86_VPX_ARITH_H | ||
| 26 | |||
| 27 | #include "libavutil/x86/asm.h" | ||
| 28 | |||
| 29 | #if HAVE_INLINE_ASM && HAVE_FAST_CMOV && HAVE_6REGS | ||
| 30 | #include "libavutil/attributes.h" | ||
| 31 | |||
| 32 | #define vpx_rac_get_prob vpx_rac_get_prob | ||
| 33 | 29875944 | static av_always_inline int vpx_rac_get_prob(VPXRangeCoder *c, uint8_t prob) | |
| 34 | { | ||
| 35 | 29875944 | unsigned int code_word = vpx_rac_renorm(c); | |
| 36 | 29875944 | unsigned int low = 1 + (((c->high - 1) * prob) >> 8); | |
| 37 | 29875944 | unsigned int low_shift = low << 16; | |
| 38 | 29875944 | int bit = 0; | |
| 39 | 29875944 | c->code_word = code_word; | |
| 40 | |||
| 41 | 29875944 | __asm__( | |
| 42 | "subl %4, %1 \n\t" | ||
| 43 | "subl %3, %2 \n\t" | ||
| 44 | "setae %b0 \n\t" | ||
| 45 | "cmovb %4, %1 \n\t" | ||
| 46 | "cmovb %5, %2 \n\t" | ||
| 47 | 29875944 | : "+q"(bit), "+&r"(c->high), "+&r"(c->code_word) | |
| 48 | : "r"(low_shift), "r"(low), "r"(code_word) | ||
| 49 | ); | ||
| 50 | |||
| 51 | 29875944 | return bit; | |
| 52 | } | ||
| 53 | #endif | ||
| 54 | |||
| 55 | #endif /* AVCODEC_X86_VPX_ARITH_H */ | ||
| 56 |