FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
probetest.c
Go to the documentation of this file.
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 #include "libavutil/timer.h"
27 
28 #define MAX_FORMATS 1000 //this must be larger than the number of formats
30 static int64_t time_array[MAX_FORMATS];
31 static int failures = 0;
32 static const char *single_format;
33 
34 #ifndef AV_READ_TIME
35 #define AV_READ_TIME(x) 0
36 #endif
37 
38 static void probe(AVProbeData *pd, int type, int p, int size)
39 {
40  int i = 0;
41  AVInputFormat *fmt = NULL;
42 
43  while ((fmt = av_iformat_next(fmt))) {
44  if (fmt->flags & AVFMT_NOFILE)
45  continue;
46  if (fmt->read_probe &&
47  (!single_format || !strcmp(single_format, fmt->name))
48  ) {
49  int score;
50  int64_t start = AV_READ_TIME();
51  score = fmt->read_probe(pd);
52  time_array[i] += AV_READ_TIME() - start;
53  if (score > score_array[i] && score > AVPROBE_SCORE_MAX / 4) {
54  score_array[i] = score;
55  fprintf(stderr,
56  "Failure of %s probing code with score=%d type=%d p=%X size=%d\n",
57  fmt->name, score, type, p, size);
58  failures++;
59  }
60  }
61  i++;
62  }
63 }
64 
65 static void print_times(void)
66 {
67  int i = 0;
68  AVInputFormat *fmt = NULL;
69 
70  while ((fmt = av_iformat_next(fmt))) {
71  if (fmt->flags & AVFMT_NOFILE)
72  continue;
73  if (time_array[i] > 1000000) {
74  fprintf(stderr, "%12"PRIu64" cycles, %12s\n",
75  time_array[i], fmt->name);
76  }
77  i++;
78  }
79 }
80 
81 static int read_int(char *arg) {
82  int ret;
83 
84  if (!arg || !*arg)
85  return -1;
86  ret = strtol(arg, &arg, 0);
87  if (*arg)
88  return -1;
89  return ret;
90 }
91 
92 int main(int argc, char **argv)
93 {
94  unsigned int p, i, type, size, retry;
95  AVProbeData pd = { 0 };
96  AVLFG state;
97  PutBitContext pb;
98  int retry_count= 4097;
99  int max_size = 65537;
100  int j;
101 
102  for (j = i = 1; i<argc; i++) {
103  if (!strcmp(argv[i], "-f") && i+1<argc && !single_format) {
104  single_format = argv[++i];
105  } else if (read_int(argv[i])>0 && j == 1) {
106  retry_count = read_int(argv[i]);
107  j++;
108  } else if (read_int(argv[i])>0 && j == 2) {
109  max_size = read_int(argv[i]);
110  j++;
111  } else {
112  fprintf(stderr, "probetest [-f <input format>] [<retry_count> [<max_size>]]\n");
113  return 1;
114  }
115  }
116 
117  if (max_size > 1000000000U/8) {
118  fprintf(stderr, "max_size out of bounds\n");
119  return 1;
120  }
121 
122  if (retry_count > 1000000000U) {
123  fprintf(stderr, "retry_count out of bounds\n");
124  return 1;
125  }
126 
128  av_register_all();
129 
130  av_lfg_init(&state, 0xdeadbeef);
131 
132  pd.buf = NULL;
133  for (size = 1; size < max_size; size *= 2) {
134  pd.buf_size = size;
135  pd.buf = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
136  pd.filename = "";
137 
138  if (!pd.buf) {
139  fprintf(stderr, "out of memory\n");
140  return 1;
141  }
142 
143  memset(pd.buf, 0, size + AVPROBE_PADDING_SIZE);
144 
145  fprintf(stderr, "testing size=%d\n", size);
146 
147  for (retry = 0; retry < retry_count; retry += FFMAX(size, 32)) {
148  for (type = 0; type < 4; type++) {
149  for (p = 0; p < 4096; p++) {
150  unsigned hist = 0;
151  init_put_bits(&pb, pd.buf, size);
152  switch (type) {
153  case 0:
154  for (i = 0; i < size * 8; i++)
155  put_bits(&pb, 1, (av_lfg_get(&state) & 0xFFFFFFFF) > p << 20);
156  break;
157  case 1:
158  for (i = 0; i < size * 8; i++) {
159  unsigned int p2 = hist ? p & 0x3F : (p >> 6);
160  unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 26;
161  put_bits(&pb, 1, v);
162  hist = v;
163  }
164  break;
165  case 2:
166  for (i = 0; i < size * 8; i++) {
167  unsigned int p2 = (p >> (hist * 3)) & 7;
168  unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 29;
169  put_bits(&pb, 1, v);
170  hist = (2 * hist + v) & 3;
171  }
172  break;
173  case 3:
174  for (i = 0; i < size; i++) {
175  int c = 0;
176  while (p & 63) {
177  c = (av_lfg_get(&state) & 0xFFFFFFFF) >> 24;
178  if (c >= 'a' && c <= 'z' && (p & 1))
179  break;
180  else if (c >= 'A' && c <= 'Z' && (p & 2))
181  break;
182  else if (c >= '0' && c <= '9' && (p & 4))
183  break;
184  else if (c == ' ' && (p & 8))
185  break;
186  else if (c == 0 && (p & 16))
187  break;
188  else if (c == 1 && (p & 32))
189  break;
190  }
191  pd.buf[i] = c;
192  }
193  }
194  flush_put_bits(&pb);
195  probe(&pd, type, p, size);
196  }
197  }
198  }
199  }
200  if(AV_READ_TIME())
201  print_times();
202  return failures;
203 }