2 * copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
23 #include "libavformat/avformat.h"
24 #include "libavcodec/put_bits.h"
25 #include "libavutil/lfg.h"
27 static int score_array[1000]; //this must be larger than the number of formats
28 static int failures = 0;
30 static void probe(AVProbeData *pd, int type, int p, int size)
33 AVInputFormat *fmt = NULL;
35 while ((fmt = av_iformat_next(fmt))) {
36 if (fmt->flags & AVFMT_NOFILE)
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;
43 "Failure of %s probing code with score=%d type=%d p=%X size=%d\n",
44 fmt->name, score, type, p, size);
52 int main(int argc, char **argv)
54 unsigned int p, i, type, size, retry;
58 int retry_count= 4097;
62 retry_count = atoi(argv[1]);
64 max_size = atoi(argv[2]);
66 if (max_size > 1000000000U/8) {
67 fprintf(stderr, "max_size out of bounds\n");
71 if (retry_count > 1000000000U) {
72 fprintf(stderr, "retry_count out of bounds\n");
76 avcodec_register_all();
79 av_lfg_init(&state, 0xdeadbeef);
82 for (size = 1; size < max_size; size *= 2) {
84 pd.buf = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
87 memset(pd.buf, 0, size + AVPROBE_PADDING_SIZE);
89 fprintf(stderr, "testing size=%d\n", size);
91 for (retry = 0; retry < retry_count; retry += FFMAX(size, 32)) {
92 for (type = 0; type < 4; type++) {
93 for (p = 0; p < 4096; p++) {
95 init_put_bits(&pb, pd.buf, size);
98 for (i = 0; i < size * 8; i++)
99 put_bits(&pb, 1, (av_lfg_get(&state) & 0xFFFFFFFF) > p << 20);
102 for (i = 0; i < size * 8; i++) {
103 unsigned int p2 = hist ? p & 0x3F : (p >> 6);
104 unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 26;
110 for (i = 0; i < size * 8; i++) {
111 unsigned int p2 = (p >> (hist * 3)) & 7;
112 unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 29;
114 hist = (2 * hist + v) & 3;
118 for (i = 0; i < size; i++) {
121 c = (av_lfg_get(&state) & 0xFFFFFFFF) >> 24;
122 if (c >= 'a' && c <= 'z' && (p & 1))
124 else if (c >= 'A' && c <= 'Z' && (p & 2))
126 else if (c >= '0' && c <= '9' && (p & 4))
128 else if (c == ' ' && (p & 8))
130 else if (c == 0 && (p & 16))
132 else if (c == 1 && (p & 32))
139 probe(&pd, type, p, size);