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