tools/probetest.c

   1 /*
   2  * copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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 = 0;
  33     AVInputFormat *fmt = NULL;
  34
  35     while ((fmt = av_iformat_next(fmt))) {
  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,
  43                         "Failure of %s probing code with score=%d type=%d p=%X size=%d\n",
  44                         fmt->name, score, type, p, size);
  45                 failures++;
  46             }
  47         }
  48         i++;
  49     }
  50 }
  51
  52 int main(void)
  53 {
  54     unsigned int p, i, type, size, retry;
  55     AVProbeData pd;
  56     AVLFG state;
  57     PutBitContext pb;
  58
  59     avcodec_register_all();
  60     av_register_all();
  61
  62     av_lfg_init(&state, 0xdeadbeef);
  63
  64     pd.buf = NULL;
  65     for (size = 1; size < 65537; size *= 2) {
  66         pd.buf_size = size;
  67         pd.buf      = av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
  68         pd.filename = "";
  69
  70         fprintf(stderr, "testing size=%d\n", size);
  71
  72         for (retry = 0; retry < 4097; retry += FFMAX(size, 32)) {
  73             for (type = 0; type < 4; type++) {
  74                 for (p = 0; p < 4096; p++) {
  75                     unsigned hist = 0;
  76                     init_put_bits(&pb, pd.buf, size);
  77                     switch (type) {
  78                     case 0:
  79                         for (i = 0; i < size * 8; i++)
  80                             put_bits(&pb, 1, (av_lfg_get(&state) & 0xFFFFFFFF) > p << 20);
  81                         break;
  82                     case 1:
  83                         for (i = 0; i < size * 8; i++) {
  84                             unsigned int p2 = hist ? p & 0x3F : (p >> 6);
  85                             unsigned int v  = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 26;
  86                             put_bits(&pb, 1, v);
  87                             hist = v;
  88                         }
  89                         break;
  90                     case 2:
  91                         for (i = 0; i < size * 8; i++) {
  92                             unsigned int p2 = (p >> (hist * 3)) & 7;
  93                             unsigned int v  = (av_lfg_get(&state) & 0xFFFFFFFF) > p2 << 29;
  94                             put_bits(&pb, 1, v);
  95                             hist = (2 * hist + v) & 3;
  96                         }
  97                         break;
  98                     case 3:
  99                         for (i = 0; i < size; i++) {
 100                             int c = 0;
 101                             while (p & 63) {
 102                                 c = (av_lfg_get(&state) & 0xFFFFFFFF) >> 24;
 103                                 if (c >= 'a' && c <= 'z' && (p & 1))
 104                                     break;
 105                                 else if (c >= 'A' && c <= 'Z' && (p & 2))
 106                                     break;
 107                                 else if (c >= '0' && c <= '9' && (p & 4))
 108                                     break;
 109                                 else if (c == ' ' && (p & 8))
 110                                     break;
 111                                 else if (c == 0 && (p & 16))
 112                                     break;
 113                                 else if (c == 1 && (p & 32))
 114                                     break;
 115                             }
 116                             pd.buf[i] = c;
 117                         }
 118                     }
 119                     flush_put_bits(&pb);
 120                     probe(&pd, type, p, size);
 121                 }
 122             }
 123         }
 124     }
 125     return failures;
 126 }