FFmpeg  4.3.7
probetest.c
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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  const AVInputFormat *fmt = NULL;
42  void *fmt_opaque = NULL;
43 
44  while ((fmt = av_demuxer_iterate(&fmt_opaque))) {
45  if (fmt->flags & AVFMT_NOFILE)
46  continue;
47  if (fmt->read_probe &&
48  (!single_format || !strcmp(single_format, fmt->name))
49  ) {
50  int score;
51  int64_t start = AV_READ_TIME();
52  score = fmt->read_probe(pd);
53  time_array[i] += AV_READ_TIME() - start;
54  if (score > score_array[i] && score > AVPROBE_SCORE_MAX / 4) {
55  score_array[i] = score;
56  fprintf(stderr,
57  "Failure of %s probing code with score=%d type=%d p=%X size=%d\n",
58  fmt->name, score, type, p, size);
59  failures++;
60  }
61  }
62  i++;
63  }
64 }
65 
66 static void print_times(void)
67 {
68  int i = 0;
69  const AVInputFormat *fmt = NULL;
70  void *fmt_opaque = NULL;
71 
72  while ((fmt = av_demuxer_iterate(&fmt_opaque))) {
73  if (fmt->flags & AVFMT_NOFILE)
74  continue;
75  if (time_array[i] > 1000000) {
76  fprintf(stderr, "%12"PRIu64" cycles, %12s\n",
77  time_array[i], fmt->name);
78  }
79  i++;
80  }
81 }
82 
83 static int read_int(char *arg) {
84  int ret;
85 
86  if (!arg || !*arg)
87  return -1;
88  ret = strtol(arg, &arg, 0);
89  if (*arg)
90  return -1;
91  return ret;
92 }
93 
94 int main(int argc, char **argv)
95 {
96  unsigned int p, i, type, size, retry;
97  AVProbeData pd = { 0 };
98  AVLFG state;
99  PutBitContext pb;
100  int retry_count= 4097;
101  int max_size = 65537;
102  int j;
103 
104  for (j = i = 1; i<argc; i++) {
105  if (!strcmp(argv[i], "-f") && i+1<argc && !single_format) {
106  single_format = argv[++i];
107  } else if (read_int(argv[i])>0 && j == 1) {
108  retry_count = read_int(argv[i]);
109  j++;
110  } else if (read_int(argv[i])>0 && j == 2) {
111  max_size = read_int(argv[i]);
112  j++;
113  } else {
114  fprintf(stderr, "probetest [-f <input format>] [<retry_count> [<max_size>]]\n");
115  return 1;
116  }
117  }
118 
119  if (max_size > 1000000000U/8) {
120  fprintf(stderr, "max_size out of bounds\n");
121  return 1;
122  }
123 
124  if (retry_count > 1000000000U) {
125  fprintf(stderr, "retry_count out of bounds\n");
126  return 1;
127  }
128 
129  av_lfg_init(&state, 0xdeadbeef);
130 
131  pd.buf = NULL;
132  for (size = 1; size < max_size; size *= 2) {
133  pd.buf_size = size;
134  pd.buf = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
135  pd.filename = "";
136 
137  if (!pd.buf) {
138  fprintf(stderr, "out of memory\n");
139  return 1;
140  }
141 
142  memset(pd.buf, 0, size + AVPROBE_PADDING_SIZE);
143 
144  fprintf(stderr, "testing size=%d\n", size);
145 
146  for (retry = 0; retry < retry_count; retry += FFMAX(size, 32)) {
147  for (type = 0; type < 4; type++) {
148  for (p = 0; p < 4096; p++) {
149  unsigned hist = 0;
150  init_put_bits(&pb, pd.buf, size);
151  switch (type) {
152  case 0:
153  for (i = 0; i < size * 8; i++)
154  put_bits(&pb, 1, (av_lfg_get(&state) & 0xFFFFFFFF) > p << 20);
155  break;
156  case 1:
157  for (i = 0; i < size * 8; i++) {
158  unsigned int p2 = hist ? p & 0x3F : (p >> 6);
159  unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 26;
160  put_bits(&pb, 1, v);
161  hist = v;
162  }
163  break;
164  case 2:
165  for (i = 0; i < size * 8; i++) {
166  unsigned int p2 = (p >> (hist * 3)) & 7;
167  unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 29;
168  put_bits(&pb, 1, v);
169  hist = (2 * hist + v) & 3;
170  }
171  break;
172  case 3:
173  for (i = 0; i < size; i++) {
174  int c = 0;
175  while (p & 63) {
176  c = (av_lfg_get(&state) & 0xFFFFFFFF) >> 24;
177  if (c >= 'a' && c <= 'z' && (p & 1))
178  break;
179  else if (c >= 'A' && c <= 'Z' && (p & 2))
180  break;
181  else if (c >= '0' && c <= '9' && (p & 4))
182  break;
183  else if (c == ' ' && (p & 8))
184  break;
185  else if (c == 0 && (p & 16))
186  break;
187  else if (c == 1 && (p & 32))
188  break;
189  }
190  pd.buf[i] = c;
191  }
192  }
193  flush_put_bits(&pb);
194  probe(&pd, type, p, size);
195  }
196  }
197  }
198  }
199  if(AV_READ_TIME())
200  print_times();
201  return failures;
202 }
Context structure for the Lagged Fibonacci PRNG.
Definition: lfg.h:33
int(* read_probe)(const AVProbeData *)
Tell if a given file has a chance of being parsed as this format.
Definition: avformat.h:708
#define NULL
Definition: coverity.c:32
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:134
static struct @314 state
int size
#define MAX_FORMATS
Definition: probetest.c:28
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:208
const char * filename
Definition: avformat.h:442
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:455
static void probe(AVProbeData *pd, int type, int p, int size)
Definition: probetest.c:38
static int read_int(char *arg)
Definition: probetest.c:83
int flags
Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS, AVFMT_NOTIMESTAMPS, AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH, AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
Definition: avformat.h:664
static int64_t time_array[MAX_FORMATS]
Definition: probetest.c:30
static const char * single_format
Definition: probetest.c:32
high precision timer, useful to profile code
#define U(x)
Definition: vp56_arith.h:37
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
static int score_array[MAX_FORMATS]
Definition: probetest.c:29
const char * arg
Definition: jacosubdec.c:66
#define AV_READ_TIME(x)
Definition: probetest.c:35
#define FFMAX(a, b)
Definition: common.h:94
static int failures
Definition: probetest.c:31
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int main(int argc, char **argv)
Definition: probetest.c:94
const AVInputFormat * av_demuxer_iterate(void **opaque)
Iterate over all registered demuxers.
Definition: allformats.c:533
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:53
cl_device_type type
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:101
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
static double c[64]
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
static void print_times(void)
Definition: probetest.c:66
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
bitstream writer API