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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;
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;
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 
127  av_lfg_init(&state, 0xdeadbeef);
128 
129  pd.buf = NULL;
130  for (size = 1; size < max_size; size *= 2) {
131  pd.buf_size = size;
132  pd.buf = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
133  pd.filename = "";
134 
135  if (!pd.buf) {
136  fprintf(stderr, "out of memory\n");
137  return 1;
138  }
139 
140  memset(pd.buf, 0, size + AVPROBE_PADDING_SIZE);
141 
142  fprintf(stderr, "testing size=%d\n", size);
143 
144  for (retry = 0; retry < retry_count; retry += FFMAX(size, 32)) {
145  for (type = 0; type < 4; type++) {
146  for (p = 0; p < 4096; p++) {
147  unsigned hist = 0;
148  init_put_bits(&pb, pd.buf, size);
149  switch (type) {
150  case 0:
151  for (i = 0; i < size * 8; i++)
152  put_bits(&pb, 1, (av_lfg_get(&state) & 0xFFFFFFFF) > p << 20);
153  break;
154  case 1:
155  for (i = 0; i < size * 8; i++) {
156  unsigned int p2 = hist ? p & 0x3F : (p >> 6);
157  unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 26;
158  put_bits(&pb, 1, v);
159  hist = v;
160  }
161  break;
162  case 2:
163  for (i = 0; i < size * 8; i++) {
164  unsigned int p2 = (p >> (hist * 3)) & 7;
165  unsigned int v = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 29;
166  put_bits(&pb, 1, v);
167  hist = (2 * hist + v) & 3;
168  }
169  break;
170  case 3:
171  for (i = 0; i < size; i++) {
172  int c = 0;
173  while (p & 63) {
174  c = (av_lfg_get(&state) & 0xFFFFFFFF) >> 24;
175  if (c >= 'a' && c <= 'z' && (p & 1))
176  break;
177  else if (c >= 'A' && c <= 'Z' && (p & 2))
178  break;
179  else if (c >= '0' && c <= '9' && (p & 4))
180  break;
181  else if (c == ' ' && (p & 8))
182  break;
183  else if (c == 0 && (p & 16))
184  break;
185  else if (c == 1 && (p & 32))
186  break;
187  }
188  pd.buf[i] = c;
189  }
190  }
191  flush_put_bits(&pb);
192  probe(&pd, type, p, size);
193  }
194  }
195  }
196  }
197  if(AV_READ_TIME())
198  print_times();
199  return failures;
200 }
Definition: lfg.h:27
#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:135
#define MAX_FORMATS
Definition: probetest.c:28
const char * fmt
Definition: avisynth_c.h:769
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:449
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:462
static void probe(AVProbeData *pd, int type, int p, int size)
Definition: probetest.c:38
static int read_int(char *arg)
Definition: probetest.c:81
int flags
Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS, AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH, AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
Definition: avformat.h:661
static int64_t time_array[MAX_FORMATS]
Definition: probetest.c:30
ptrdiff_t size
Definition: opengl_enc.c:101
static const char * single_format
Definition: probetest.c:32
high precision timer, useful to profile code
#define U(x)
Definition: vp56_arith.h:37
int(* read_probe)(AVProbeData *)
Tell if a given file has a chance of being parsed as this format.
Definition: avformat.h:705
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:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
static struct @303 state
int main(int argc, char **argv)
Definition: probetest.c:92
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:47
GLint GLenum type
Definition: opengl_enc.c:105
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:448
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
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:465
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:65
void INT64 start
Definition: avisynth_c.h:690
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
bitstream writer API