Runloop is not run if body only

[melMass]

Kind of related to #474

All samples work, but the demo tilt loop is never run. What is strange is that it is blocking the program properly, but even if I print something in the first line of body, I don't see anything

Original Sample

#!/usr/bin/env python
import freenect
import time
import random
import signal

keep_running = True
last_time = 0


def body(dev, ctx):
    global last_time
    if not keep_running:
        raise freenect.Kill
    if time.time() - last_time < 3:
        return
    last_time = time.time()
    led = random.randint(0, 6)
    tilt = random.randint(0, 30)
    freenect.set_led(dev, led)
    freenect.set_tilt_degs(dev, tilt)
    print('led[%d] tilt[%d] accel[%s]' % (led, tilt, freenect.get_accel(dev)))


def handler(signum, frame):
    """Sets up the kill handler, catches SIGINT"""
    global keep_running
    keep_running = False
print('Press Ctrl-C in terminal to stop')
signal.signal(signal.SIGINT, handler)
freenect.runloop(body=body)

Working example if I instance a CV window and use the video callback then the loop is run

#!/usr/bin/env python
import freenect
import time
import random
import signal
import cv2
import frame_convert2

cv2.namedWindow("RGB")
keep_running = True
last_time = 0


def body(*args):
    dev = args[0]
    print("body")
    global last_time
    print(last_time)
    if not keep_running:
        raise freenect.Kill
    if time.time() - last_time < 3:
        return
    last_time = time.time()
    led = random.randint(0, 6)
    tilt = random.randint(0, 30)
    freenect.set_led(dev, led)
    freenect.set_tilt_degs(dev, tilt)
    print("led[%d] tilt[%d] accel[%s]" % (led, tilt, freenect.get_accel(dev)))


def handler(signum, frame):
    """Sets up the kill handler, catches SIGINT"""
    global keep_running
    keep_running = False


def display_rgb(dev, data, timestamp):
    global keep_running
    cv2.imshow("RGB", frame_convert2.video_cv(data))
    if cv2.waitKey(10) == 27:
        keep_running = False


print("Press Ctrl-C in terminal to stop")
signal.signal(signal.SIGINT, handler)
print("Running loop")
freenect.runloop(video=display_rgb, body=body)

[piedar]

How long did you wait? Since this demo does not register a video or depth callback, those streams are never started and so the runloop blocks at freenect_process_events() because there are no events. When I run demo_tilt.py it fires once every 60 seconds, which corresponds to the timeout for that call.