p->buf[2] == 'S' && p->buf[3] == '\0')
p->buf[2] == 'S')
static int swf_probe(AVProbeData *p){    /* check file header */    if (p->buf_size <= 16)        return 0;    if (p->buf[0] == 'F' && p->buf[1] == 'W' &&        p->buf[2] == 'S' && p->buf[3] == '\0')        return AVPROBE_SCORE_MAX;    else        return 0;}