Libav
libavcodec
startcode.c
Go to the documentation of this file.
1
/*
2
* Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
3
*
4
* This file is part of Libav.
5
*
6
* Libav is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2.1 of the License, or (at your option) any later version.
10
*
11
* Libav is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
15
*
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with Libav; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
*/
20
28
#include "
startcode.h
"
29
#include "
config.h
"
30
31
int
ff_startcode_find_candidate_c
(
const
uint8_t
*buf,
int
size
)
32
{
33
int
i = 0;
34
#if HAVE_FAST_UNALIGNED
35
/* we check i < size instead of i + 3 / 7 because it is
36
* simpler and there must be AV_INPUT_BUFFER_PADDING_SIZE
37
* bytes at the end.
38
*/
39
#if HAVE_FAST_64BIT
40
while
(i < size &&
41
!((~*(
const
uint64_t *)(buf + i) &
42
(*(
const
uint64_t *)(buf + i) - 0x0101010101010101ULL)) &
43
0x8080808080808080ULL))
44
i += 8;
45
#else
46
while
(i < size &&
47
!((~*(
const
uint32_t *)(buf + i) &
48
(*(
const
uint32_t *)(buf + i) - 0x01010101U)) &
49
0x80808080U))
50
i += 4;
51
#endif
52
#endif
53
for
(; i <
size
; i++)
54
if
(!buf[i])
55
break
;
56
return
i;
57
}
size
int size
Definition:
twinvq_data.h:11134
config.h
uint8_t
uint8_t
Definition:
audio_convert.c:194
startcode.h
ff_startcode_find_candidate_c
int ff_startcode_find_candidate_c(const uint8_t *buf, int size)
Definition:
startcode.c:31
Generated on Fri Dec 1 2017 07:11:58 for Libav by
1.8.13