ffmpeg/tools/probetest.c

/*
 * 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;
}