summaryrefslogtreecommitdiff
path: root/tools/probetest.c
blob: b685e3d6c2dfc4371281e71148c4e612e7658680 (plain)
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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/*
 * copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; 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"
#include "libavutil/timer.h"

#define MAX_FORMATS 1000 //this must be larger than the number of formats
static int score_array[MAX_FORMATS];
static int64_t time_array[MAX_FORMATS];
static int failures = 0;

#ifndef AV_READ_TIME
#define AV_READ_TIME(x) 0
#endif

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;
            int64_t start = AV_READ_TIME();
            score = fmt->read_probe(pd);
            time_array[i] += AV_READ_TIME() - start;
            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++;
    }
}

static void print_times(void)
{
    int i = 0;
    AVInputFormat *fmt = NULL;

    while ((fmt = av_iformat_next(fmt))) {
        if (fmt->flags & AVFMT_NOFILE)
            continue;
        if (time_array[i] > 1000000) {
            fprintf(stderr, "%12"PRIu64" cycles, %12s\n",
                    time_array[i], fmt->name);
        }
        i++;
    }
}

int main(int argc, char **argv)
{
    unsigned int p, i, type, size, retry;
    AVProbeData pd;
    AVLFG state;
    PutBitContext pb;
    int retry_count= 4097;
    int max_size = 65537;

    if(argc >= 2)
        retry_count = atoi(argv[1]);
    if(argc >= 3)
        max_size = atoi(argv[2]);

    if (max_size > 1000000000U/8) {
        fprintf(stderr, "max_size out of bounds\n");
        return 1;
    }

    if (retry_count > 1000000000U) {
        fprintf(stderr, "retry_count out of bounds\n");
        return 1;
    }

    avcodec_register_all();
    av_register_all();

    av_lfg_init(&state, 0xdeadbeef);

    pd.buf = NULL;
    for (size = 1; size < max_size; size *= 2) {
        pd.buf_size = size;
        pd.buf      = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
        pd.filename = "";

        if (!pd.buf) {
            fprintf(stderr, "out of memory\n");
            return 1;
        }

        memset(pd.buf, 0, size + AVPROBE_PADDING_SIZE);

        fprintf(stderr, "testing size=%d\n", size);

        for (retry = 0; retry < retry_count; 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);
                }
            }
        }
    }
    if(AV_READ_TIME())
        print_times();
    return failures;
}