]> git.sesse.net Git - ffmpeg/blob - tools/probetest.c
Probetest, to test the demuxers probe functions against random and not so random
[ffmpeg] / tools / probetest.c
1 /*
2  * copyright (c) 2009 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 #include <stdlib.h>
22
23 #include "libavformat/avformat.h"
24 #include "libavcodec/put_bits.h"
25 #include "libavutil/lfg.h"
26
27 static int score_array[1000]; //this must be larger than the number of formats
28 static int failures=0;
29
30 static void probe(AVProbeData *pd, int type, int p, int size)
31 {
32     int i;
33     AVInputFormat *fmt;
34
35     for(fmt = first_iformat; fmt != NULL; fmt = fmt->next) {
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", fmt->name, score, type, p, size);
43                 failures++;
44             }
45         }
46         i++;
47     }
48 }
49
50 int main(int argc, char **argv)
51 {
52     unsigned int p, i, type, size, retry;
53     AVProbeData pd;
54     AVLFG state;
55     PutBitContext pb;
56
57     avcodec_register_all();
58     av_register_all();
59
60     av_lfg_init(&state, 0xdeadbeef);
61
62     pd.buf= NULL;
63     for(size= 1; size < 65537; size*=2){
64         pd.buf_size= size;
65         pd.buf= av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
66         pd.filename= "";
67
68         fprintf(stderr, "testing size=%d\n", size);
69
70         for(retry=0; retry<4097; retry+= FFMAX(size,32)){
71             for(type=0; type < 4; type++){
72                 for(p=0; p<4096; p++){
73                     unsigned hist=0;
74                     init_put_bits(&pb, pd.buf, size);
75                     switch(type){
76                     case 0:
77                         for(i=0; i<size*8; i++){
78                             put_bits(&pb, 1, (av_lfg_get(&state)&0xFFFFFFFF) > p<<20);
79                         }
80                         break;
81                     case 1:
82                         for(i=0; i<size*8; i++){
83                             unsigned int p2= hist ? p&0x3F : (p>>6);
84                             unsigned int v= (av_lfg_get(&state)&0xFFFFFFFF) > p2<<26;
85                             put_bits(&pb, 1, v);
86                             hist= v;
87                         }
88                         break;
89                     case 2:
90                         for(i=0; i<size*8; i++){
91                             unsigned int p2= (p >> (hist*3)) & 7;
92                             unsigned int v= (av_lfg_get(&state)&0xFFFFFFFF) > p2<<29;
93                             put_bits(&pb, 1, v);
94                             hist= (2*hist + v)&3;
95                         }
96                         break;
97                     case 3:
98                         for(i=0; i<size; i++){
99                             int c=0;
100                             while(p&63){
101                                 c= (av_lfg_get(&state)&0xFFFFFFFF)>>24;
102                                 if     (c >= 'a' && c <= 'z' && (p&1)) break;
103                                 else if(c >= 'A' && c <= 'Z' && (p&2)) break;
104                                 else if(c >= '0' && c <= '9' && (p&4)) break;
105                                 else if(c == ' '&& (p&8)) break;
106                                 else if(c == 0 && (p&16)) break;
107                                 else if(c == 1 && (p&32)) break;
108                             }
109                             pd.buf[i]= c;
110                         }
111                     }
112                     flush_put_bits(&pb);
113                     probe(&pd, type, p, size);
114                 }
115             }
116         }
117     }
118     return failures;
119 }