static int dvbsub_probe(AVProbeData *p) { int i, j, k; const uint8_t *end = p->buf + p->buf_size; int type, len; int max_score = 0; for(i=0; i<p->buf_size; i++){ if (p->buf[i] == 0x0f) { const uint8_t *ptr = p->buf + i; uint8_t histogram[6] = {0}; int min = 255; for(j=0; ptr + 6 < end; j++) { if (*ptr != 0x0f) break; type = ptr[1]; //page_id = AV_RB16(ptr + 2); len = AV_RB16(ptr + 4); if (type == 0x80) { ; } else if (type >= 0x10 && type <= 0x14) { histogram[type - 0x10] ++; } else break; ptr += 6 + len; } for (k=0; k < 4; k++) { min = FFMIN(min, histogram[k]); } if (min && j > max_score) max_score = j; } } if (max_score > 5) return AVPROBE_SCORE_EXTENSION; return 0; }