static int mpegps_probe(AVProbeData *p) { uint32_t code= -1; int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0; int i; int score=0; for(i=0; i<p->buf_size; i++){ code = (code<<8) + p->buf[i]; if ((code & 0xffffff00) == 0x100) { int len= p->buf[i+1] << 8 | p->buf[i+2]; int pes= check_pes(p->buf+i, p->buf+p->buf_size); if(code == SYSTEM_HEADER_START_CODE) sys++; else if(code == PACK_START_CODE) pspack++; else if((code & 0xf0) == VIDEO_ID && pes) vid++; // skip pes payload to avoid start code emulation for private // and audio streams else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;} else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;} else if((code & 0xf0) == VIDEO_ID && !pes) invalid++; else if((code & 0xe0) == AUDIO_ID && !pes) invalid++; else if(code == PRIVATE_STREAM_1 && !pes) invalid++; } } if(vid+audio > invalid) /* invalid VDR files nd short PES streams */ score= AVPROBE_SCORE_MAX/4; //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, invalid, p->buf_size); if(sys>invalid && sys*9 <= pspack*10) return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9) return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */ return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6 return score; }