static int mpegvideo_probe(AVProbeData *p) { uint32_t code= -1; int pic=0, seq=0, slice=0, pspack=0, vpes=0, apes=0, res=0; int i; for(i=0; i<p->buf_size; i++){ code = (code<<8) + p->buf[i]; if ((code & 0xffffff00) == 0x100) { switch(code){ case SEQ_START_CODE: seq++; break; case PICTURE_START_CODE: pic++; break; case PACK_START_CODE: pspack++; break; case 0x1b6: res++; break; } if (code >= SLICE_START_CODE && code <= 0x1af) slice++; if ((code & 0x1f0) == VIDEO_ID) vpes++; else if((code & 0x1e0) == AUDIO_ID) apes++; } } if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res) { if(vpes) return AVPROBE_SCORE_MAX/8; else return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg } return 0; }