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Michael Niedermayer
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/*
* copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include "libavformat/avformat.h"
#include "libavcodec/put_bits.h"
#include "libavutil/lfg.h"
static int score_array[1000]; //this must be larger than the number of formats
static int failures=0;
static void probe(AVProbeData *pd, int type, int p, int size)
{
int i;
AVInputFormat *fmt;
for(fmt = first_iformat; fmt != NULL; fmt = fmt->next) {
if (fmt->flags & AVFMT_NOFILE)
continue;
if (fmt->read_probe) {
int score = fmt->read_probe(pd);
if(score > score_array[i] && score > AVPROBE_SCORE_MAX/4){
score_array[i]= score;
fprintf(stderr, "Failure of %s probing code with score=%d type=%d p=%X size=%d\n", fmt->name, score, type, p, size);
failures++;
}
}
i++;
}
}
int main(int argc, char **argv)
{
unsigned int p, i, type, size, retry;
AVProbeData pd;
AVLFG state;
PutBitContext pb;
avcodec_register_all();
av_register_all();
av_lfg_init(&state, 0xdeadbeef);
pd.buf= NULL;
for(size= 1; size < 65537; size*=2){
pd.buf_size= size;
pd.buf= av_realloc(pd.buf, size + AVPROBE_PADDING_SIZE);
pd.filename= "";
fprintf(stderr, "testing size=%d\n", size);
for(retry=0; retry<4097; retry+= FFMAX(size,32)){
for(type=0; type < 4; type++){
for(p=0; p<4096; p++){
unsigned hist=0;
init_put_bits(&pb, pd.buf, size);
switch(type){
case 0:
for(i=0; i<size*8; i++){
put_bits(&pb, 1, (av_lfg_get(&state)&0xFFFFFFFF) > p<<20);
}
break;
case 1:
for(i=0; i<size*8; i++){
unsigned int p2= hist ? p&0x3F : (p>>6);
unsigned int v= (av_lfg_get(&state)&0xFFFFFFFF) > p2<<26;
put_bits(&pb, 1, v);
hist= v;
}
break;
case 2:
for(i=0; i<size*8; i++){
unsigned int p2= (p >> (hist*3)) & 7;
unsigned int v= (av_lfg_get(&state)&0xFFFFFFFF) > p2<<29;
put_bits(&pb, 1, v);
hist= (2*hist + v)&3;
}
break;
case 3:
for(i=0; i<size; i++){
int c=0;
while(p&63){
c= (av_lfg_get(&state)&0xFFFFFFFF)>>24;
if (c >= 'a' && c <= 'z' && (p&1)) break;
else if(c >= 'A' && c <= 'Z' && (p&2)) break;
else if(c >= '0' && c <= '9' && (p&4)) break;
else if(c == ' '&& (p&8)) break;
else if(c == 0 && (p&16)) break;
else if(c == 1 && (p&32)) break;
}
pd.buf[i]= c;
}
}
flush_put_bits(&pb);
probe(&pd, type, p, size);
}
}
}
}
return failures;
}