mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
3.5 KiB
92 lines
3.5 KiB
/* |
|
* Copyright (C) 2010 Mans Rullgard <mans@mansr.com> |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVCODEC_ARM_VP56_ARITH_H |
|
#define AVCODEC_ARM_VP56_ARITH_H |
|
|
|
#if HAVE_ARMV6 && HAVE_INLINE_ASM |
|
|
|
#define vp56_rac_get_prob vp56_rac_get_prob_armv6 |
|
static inline int vp56_rac_get_prob_armv6(VP56RangeCoder *c, int pr) |
|
{ |
|
unsigned shift = ff_vp56_norm_shift[c->high]; |
|
unsigned code_word = c->code_word << shift; |
|
unsigned high = c->high << shift; |
|
unsigned bit; |
|
|
|
__asm__ volatile ("adds %3, %3, %0 \n" |
|
"cmpcs %7, %4 \n" |
|
"ldrcsh %2, [%4], #2 \n" |
|
"rsb %0, %6, #256 \n" |
|
"smlabb %0, %5, %6, %0 \n" |
|
"rev16cs %2, %2 \n" |
|
"orrcs %1, %1, %2, lsl %3 \n" |
|
"subcs %3, %3, #16 \n" |
|
"lsr %0, %0, #8 \n" |
|
"cmp %1, %0, lsl #16 \n" |
|
"subge %1, %1, %0, lsl #16 \n" |
|
"subge %0, %5, %0 \n" |
|
"movge %2, #1 \n" |
|
"movlt %2, #0 \n" |
|
: "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit), |
|
"+&r"(c->bits), "+&r"(c->buffer) |
|
: "r"(high), "r"(pr), "r"(c->end - 1), |
|
"0"(shift), "1"(code_word)); |
|
|
|
return bit; |
|
} |
|
|
|
#define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6 |
|
static inline int vp56_rac_get_prob_branchy_armv6(VP56RangeCoder *c, int pr) |
|
{ |
|
unsigned shift = ff_vp56_norm_shift[c->high]; |
|
unsigned code_word = c->code_word << shift; |
|
unsigned high = c->high << shift; |
|
unsigned low; |
|
unsigned tmp; |
|
|
|
__asm__ volatile ("adds %3, %3, %0 \n" |
|
"cmpcs %7, %4 \n" |
|
"ldrcsh %2, [%4], #2 \n" |
|
"rsb %0, %6, #256 \n" |
|
"smlabb %0, %5, %6, %0 \n" |
|
"rev16cs %2, %2 \n" |
|
"orrcs %1, %1, %2, lsl %3 \n" |
|
"subcs %3, %3, #16 \n" |
|
"lsr %0, %0, #8 \n" |
|
"lsl %2, %0, #16 \n" |
|
: "=&r"(low), "+&r"(code_word), "=&r"(tmp), |
|
"+&r"(c->bits), "+&r"(c->buffer) |
|
: "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift)); |
|
|
|
if (code_word >= tmp) { |
|
c->high = high - low; |
|
c->code_word = code_word - tmp; |
|
return 1; |
|
} |
|
|
|
c->high = low; |
|
c->code_word = code_word; |
|
return 0; |
|
} |
|
|
|
#endif |
|
|
|
#endif
|
|
|