1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
#include <stdlib.h>
#include "libavformat/avformat.h"
#include "libavcodec/put_bits.h"
#include "libavutil/lfg.h"
static int score_array[1000]; //this must be larger than the number of formats
static int failures = 0;
static void probe(AVProbeData *pd, int type, int p, int size)
{
int i = 0;
AVInputFormat *fmt = NULL;
while ((fmt = av_iformat_next(fmt))) {
if (fmt->flags & AVFMT_NOFILE)
continue;
if (fmt->read_probe) {
int score = fmt->read_probe(pd);
if (score > score_array[i] && score > AVPROBE_SCORE_MAX / 4) {
score_array[i] = score;
fprintf(stderr,
"Failure of %s probing code with score=%d type=%d p=%X size=%d\n",
fmt->name, score, type, p, size);
failures++;
}
}
i++;
}
}
int main(void)
{
unsigned int p, i, type, size, retry;
AVProbeData pd;
AVLFG state;
PutBitContext pb;
avcodec_register_all();
av_register_all();
av_lfg_init(&state, 0xdeadbeef);
pd.buf = NULL;
for (size = 1; size < 65537; size *= 2) {
pd.buf_size = size;
pd.buf = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
pd.filename = "";
fprintf(stderr, "testing size=%d\n", size);
for (retry = 0; retry < 4097; retry += FFMAX(size, 32)) {
for (type = 0; type < 4; type++) {
for (p = 0; p < 4096; p++) {
unsigned hist = 0;
init_put_bits(&pb, pd.buf, size);
switch (type) {
case 0:
for (i = 0; i < size * 8; i++)
put_bits(&pb, 1, (av_lfg_get(&state) & 0xFFFFFFFF) > p << 20);
break;
case 1:
for (i = 0; i < size * 8; i++) {
unsigned int p2 = hist ? p & 0x3F : (p >> 6);
unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 26;
put_bits(&pb, 1, v);
hist = v;
}
break;
case 2:
for (i = 0; i < size * 8; i++) {
unsigned int p2 = (p >> (hist * 3)) & 7;
unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 29;
put_bits(&pb, 1, v);
hist = (2 * hist + v) & 3;
}
break;
case 3:
for (i = 0; i < size; i++) {
int c = 0;
while (p & 63) {
c = (av_lfg_get(&state) & 0xFFFFFFFF) >> 24;
if (c >= 'a' && c <= 'z' && (p & 1))
break;
else if (c >= 'A' && c <= 'Z' && (p & 2))
break;
else if (c >= '0' && c <= '9' && (p & 4))
break;
else if (c == ' ' && (p & 8))
break;
else if (c == 0 && (p & 16))
break;
else if (c == 1 && (p & 32))
break;
}
pd.buf[i] = c;
}
}
flush_put_bits(&pb);
probe(&pd, type, p, size);
}
}
}
}
return failures;
}
|
