FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/startcode.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 10 10 100.0%
Functions: 1 1 100.0%
Branches: 8 8 100.0%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * Accelerated start code search function for start codes common to
24 * MPEG-1/2/4 video, VC-1, H.264/5
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include "libavutil/intreadwrite.h"
29 #include "startcode.h"
30 #include "config.h"
31
32 1222397 int ff_startcode_find_candidate_c(const uint8_t *buf, int size)
33 {
34 1222397 int i = 0;
35 #if HAVE_FAST_UNALIGNED
36 /* we check i < size instead of i + 3 / 7 because it is
37 * simpler and there must be AV_INPUT_BUFFER_PADDING_SIZE
38 * bytes at the end.
39 */
40 #if HAVE_FAST_64BIT
41
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22160839 while (i < size &&
42 22136505 !((~AV_RN64(buf + i) &
43
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22136505 (AV_RN64(buf + i) - 0x0101010101010101ULL)) &
44 0x8080808080808080ULL))
45 20938442 i += 8;
46 #else
47 while (i < size &&
48 !((~AV_RN32(buf + i) &
49 (AV_RN32(buf + i) - 0x01010101U)) &
50 0x80808080U))
51 i += 4;
52 #endif
53 #endif
54
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5109502 for (; i < size; i++)
55
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4949995 if (!buf[i])
56 1062890 break;
57 1222397 return i;
58 }
59