def ex_1_8_enum_ctrls():
print
print
print
print 'ex_1_8_enum_ctrls()'
queryctrl = v4l2.v4l2_queryctrl()
querymenu = v4l2.v4l2_querymenu()
print dir(querymenu)
print querymenu.id
def enumerate_menu():
print " Menu items:"
querymenu.id = queryctrl.id
for querymenu.index in xrange(queryctrl.minimum,
queryctrl.maximum + 1):
if 0 == fcntl.ioctl(vd, v4l2.VIDIOC_QUERYCAP, querymenu):
print " %s" % querymenu.name
for queryctrl.id in xrange(v4l2.V4L2_CID_BASE, v4l2.V4L2_CID_LASTP1):
break
print 'loop: %d' % queryctrl.id
if 0 == fcntl.ioctl(vd, v4l2.VIDIOC_QUERYCTRL, queryctrl):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
print "Control %s" % queryctrl.name
if queryctrl.type == v4l2.V4L2_CTRL_TYPE_MENU:
enumerate_menu()
else:
#if errno == EINVAL:
# continue;
#perror("VIDIOC_QUERYCTRL");
print "VIDIOC_QUERYCTRL"
sys.exit(1)
queryctrl.id = v4l2.V4L2_CID_PRIVATE_BASE
while True:
if 0 != fcntl.ioctl(vd, v4l2.VIDIOC_QUERYCTRL, queryctrl):
# how to check this?
#if (errno == EINVAL)
# break;
# perror("VIDIOC_QUERYCTRL");
print "VIDIOC_QUERYCTRL"
sys.exit(1)
if not (queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED):
print "Control %s" % queryctrl.name
if queryctrl.type == v4l2.V4L2_CTRL_TYPE_MENU:
enumerate_menu()
queryctrl.id += 1
def read_camera_controls(
): # CID_BASE IDs do not include all settings that v4l2-ctl -L has, check CAMERA_CLASS_BASE ID range for the rest
vd = open('/dev/video0', 'rb+', buffering=0)
encoding = 'utf-8'
qctrl = v4l2.v4l2_queryctrl()
mctrl = v4l2.v4l2_querymenu()
vctrl = v4l2.v4l2_control()
qctrl.id = v4l2.V4L2_CID_CAMERA_CLASS_BASE
mctrl.index = 0
while qctrl.id < v4l2.V4L2_CID_PRIVACY:
try:
vctrl.id = qctrl.id
fcntl.ioctl(vd, v4l2.VIDIOC_QUERYCTRL, qctrl)
fcntl.ioctl(vd, v4l2.VIDIOC_G_CTRL, vctrl)
print("Control name:", str(qctrl.name, encoding))
print("Control type, 1=int, 2=bool, 3=menu:", qctrl.type)
print("Maximum:", qctrl.maximum)
print("Minimum:", qctrl.minimum)
print("Step:", qctrl.step)
print("Default:", qctrl.default_value)
print("Value:", vctrl.value)
if qctrl.type == 3: # is menu
while mctrl.index <= qctrl.maximum:
try: # needed because sometimes index 0 doesn't exist but 1 does
mctrl.id = qctrl.id
fcntl.ioctl(vd, v4l2.VIDIOC_QUERYMENU, mctrl)
print("Menu name:", str(qctrl.name, encoding))
print("Menu option name:", str(mctrl.name, encoding))
print("Menu option index:", mctrl.index)
mctrl.index += 1
except:
mctrl.index += 1
except:
pass
qctrl.id += 1
vd.close()
def read_base_capabalities():
vd = open('/dev/video0', 'rb+', buffering=0)
cp = v4l2.v4l2_capability()
encoding = 'utf-8'
# basic info
fcntl.ioctl(vd, v4l2.VIDIOC_QUERYCAP, cp)
print(str(cp.card, encoding))
print(str(cp.driver, encoding))
print("video capture device?\t",
bool(cp.capabilities & v4l2.V4L2_CAP_VIDEO_CAPTURE))
print("Supports read() call?\t",
bool(cp.capabilities & v4l2.V4L2_CAP_READWRITE))
print("Supports streaming?\t",
bool(cp.capabilities & v4l2.V4L2_CAP_STREAMING))
# current height, width
qctrl = v4l2.v4l2_format()
qctrl.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
fcntl.ioctl(vd, v4l2.VIDIOC_G_FMT, qctrl)
print("Width:", qctrl.fmt.pix.width)
print("Height:", qctrl.fmt.pix.height)
# output overview
qctrl = v4l2.v4l2_fmtdesc()
qctrl.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
qctrl.index = 0
fcntl.ioctl(vd, v4l2.VIDIOC_ENUM_FMT, qctrl)
print("Format:", str(qctrl.description, encoding))
print("Pixelformat ID:", qctrl.pixelformat)
get_outputs(
qctrl.pixelformat
) # pass pixelformat to read outputs, increase index for different codecs
# main controls
qctrl = v4l2.v4l2_queryctrl()
mctrl = v4l2.v4l2_querymenu()
vctrl = v4l2.v4l2_control()
qctrl.id = v4l2.V4L2_CID_BASE
mctrl.index = 0
while qctrl.id < v4l2.V4L2_CID_LASTP1: # LASTP1 is last item in CID_BASE
try:
vctrl.id = qctrl.id
fcntl.ioctl(vd, v4l2.VIDIOC_QUERYCTRL, qctrl)
fcntl.ioctl(vd, v4l2.VIDIOC_G_CTRL, vctrl)
print("Control name:", str(qctrl.name, encoding))
print("Control type, 1=int, 2=bool, 3=menu:", qctrl.type)
'''
There are more types, 4=BUTTON, 5=INTEGER64, 6=CTRL_CLASS, 7=STRING, 8=BITMASK, 9=INTEGER_MENU
Not sure what to do with those, can't test
'''
print("Maximum:", qctrl.maximum)
print("Minimum:", qctrl.minimum)
print("Step:", qctrl.step)
print("Default:", qctrl.default_value)
print("Value:", vctrl.value)
set_value(vctrl.id) # test setting value
'''
if qctrl.type == 1: # int
win.label = Gtk.Label(hexpand = True, vexpand = False)
win.label.set_text(str(qctrl.name, encoding))
win.label.set_size_request(-1, 35)
win.label.set_halign(Gtk.Align.END)
adj = Gtk.Adjustment(value = vctrl.value, lower = qctrl.minimum, upper = qctrl.maximum, step_increment = qctrl.step, page_increment = 5, page_size=0)
win.scale = Gtk.Scale(orientation=Gtk.Orientation.HORIZONTAL, adjustment=adj)
win.scale.set_digits(0)
win.scale.set_value_pos(Gtk.PositionType.RIGHT)
win.scale.set_size_request(-1, 35)
win.scale.connect("value-changed", set_int_value, card, vctrl.id)
win.intcontrolbox.pack_start(win.scale, False, False, 0)
win.intlabelbox.pack_start(win.label, False, False, 0)
'''
if qctrl.type == 3: # is menu
while mctrl.index <= qctrl.maximum:
try:
mctrl.id = qctrl.id
fcntl.ioctl(vd, v4l2.VIDIOC_QUERYMENU, mctrl)
print("Menu name:", str(qctrl.name, encoding))
print("Menu option name:", str(mctrl.name, encoding))
print("Menu option index:", mctrl.index)
mctrl.index += 1
except:
mctrl.index += 1
except:
pass
qctrl.id += 1
vd.close()
def get_device_controls_menu(fd, queryctrl):
querymenu = v4l2.v4l2_querymenu(queryctrl.id, queryctrl.minimum)
while querymenu.index <= queryctrl.maximum:
ioctl(fd, v4l2.VIDIOC_QUERYMENU, querymenu)
yield querymenu
querymenu.index += 1
def get_device_controls_menu(fd, queryctrl):
querymenu = v4l2.v4l2_querymenu(queryctrl.id, queryctrl.minimum)
while querymenu.index <= queryctrl.maximum:
ioctl(fd, v4l2.VIDIOC_QUERYMENU, querymenu)
yield querymenu
querymenu.index += 1