static int voc_probe(AVProbeData *p) { int version, check; if (p->buf_size < 26) return 0; if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1)) return 0; version = p->buf[22] | (p->buf[23] << 8); check = p->buf[24] | (p->buf[25] << 8); if (~version + 0x1234 != check) return 10; return AVPROBE_SCORE_MAX; }