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ffmpeg / tools / probetest.c @ ff19d438

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