def test_set_control(fd, input_or_output):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
original_control = v4l2.v4l2_control(queryctrl.id)
ioctl(fd, v4l2.VIDIOC_G_CTRL, original_control)
control = v4l2.v4l2_control(queryctrl.id, queryctrl.default)
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
control.value = queryctrl.minimum + queryctrl.step
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
control.value = queryctrl.minimum - queryctrl.step
try:
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
except IOError as e:
assert e.errno in (errno.ERANGE, errno.EINVAL, errno.EIO)
control.value = queryctrl.maximum + queryctrl.step
try:
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
except IOError as e:
assert e.errno in (errno.ERANGE, errno.EINVAL, errno.EIO)
if queryctrl.step > 1:
control.value = queryctrl.default + queryctrl.step - 1
try:
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
except IOError as e:
assert e.errno == errno.ERANGE
ioctl(fd, v4l2.VIDIOC_S_CTRL, original_control)
def test_set_control(fd, input_or_output):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
original_control = v4l2.v4l2_control(queryctrl.id)
ioctl(fd, v4l2.VIDIOC_G_CTRL, original_control)
control = v4l2.v4l2_control(queryctrl.id, queryctrl.default)
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
control.value = queryctrl.minimum + queryctrl.step
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
control.value = queryctrl.minimum - queryctrl.step
try:
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
except IOError, e:
assert e.errno in (
errno.ERANGE, errno.EINVAL, errno.EIO)
control.value = queryctrl.maximum + queryctrl.step
try:
ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
except IOError, e:
assert e.errno in (
errno.ERANGE, errno.EINVAL, errno.EIO)
def test_set_control(fd, input_or_output):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
print 'Ctrl: %s' % queryctrl.name
original_control = v4l2.v4l2_control(queryctrl.id)
fcntl.ioctl(fd, v4l2.VIDIOC_G_CTRL, original_control)
print ' Set: defalut'
control = v4l2.v4l2_control(queryctrl.id, queryctrl.default)
fcntl.ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
print ' Set: min'
control.value = queryctrl.minimum + queryctrl.step
fcntl.ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
control.value = queryctrl.minimum - queryctrl.step
try:
fcntl.ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
except IOError, e:
assert e.errno in (errno.ERANGE, errno.EINVAL, errno.EIO)
control.value = queryctrl.maximum + queryctrl.step
try:
fcntl.ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
except IOError, e:
assert e.errno in (errno.ERANGE, errno.EINVAL, errno.EIO)
def _set_device_controls(self):
queryctrl = v4l2.v4l2_queryctrl()
queryctrl.id = self.CtrlId
if fcntl.ioctl(self.camera, v4l2.VIDIOC_QUERYCTRL, queryctrl):
print 'queryctrl.id:0x%x is not supprotted' % (queryctrl.id)
else:
print 'queryctrl id:0x%x,type:%d,name:%s,minimum:%d,maximum:%d,step:%d\n' % (
queryctrl.id, queryctrl.type, queryctrl.name,
queryctrl.minimum, queryctrl.maximum, queryctrl.step)
ctrl = v4l2.v4l2_control()
ctrl.id = self.CtrlId
if fcntl.ioctl(self.camera, v4l2.VIDIOC_G_CTRL, ctrl):
print 'ctrl.id:0x%x is not supprotted' % (ctrl.id)
else:
print 'Get current control...id:0x%x,valus:%d\n' % (ctrl.id,
ctrl.value)
ctrl = v4l2.v4l2_control()
ctrl.id = self.CtrlId
ctrl.value = self.CtrlValue
if fcntl.ioctl(self.camera, v4l2.VIDIOC_S_CTRL, ctrl):
print 'ctrl.id:0x%x is not supprotted' % (ctrl.id)
else:
print 'Set control...id:0x%x,valus:%d\n' % (ctrl.id, ctrl.value)
ctrl = v4l2.v4l2_control()
ctrl.id = self.CtrlId
if fcntl.ioctl(self.camera, v4l2.VIDIOC_G_CTRL, ctrl):
print 'ctrl.id:0x%x is not supprotted' % (ctrl.id)
else:
print 'Check current control...id:0x%x,valus:%d\n' % (ctrl.id,
ctrl.value)
def read_exposure():
vd = open("/dev/video0", "rw")
cp = v4l2.v4l2_control()
cp.id = v4l2.V4L2_CID_EXPOSURE
fcntl.ioctl(vd, v4l2.VIDIOC_G_CTRL, cp)
vd.close()
return cp.value
def write_global_gain(val):
vd = open("/dev/video0", "rw")
cp = v4l2.v4l2_control()
cp.id = v4l2.V4L2_CID_GAIN
cp.value = int(val)
fcntl.ioctl(vd, v4l2.VIDIOC_S_CTRL, cp)
vd.close()
def read_red_gain():
vd = open("/dev/video0", "rw")
cp = v4l2.v4l2_control()
cp.id = v4l2.V4L2_CID_RED_BALANCE
fcntl.ioctl(vd, v4l2.VIDIOC_G_CTRL, cp)
vd.close()
return cp.value
def write_exposure(val):
vd = open("/dev/video0", "rw")
cp = v4l2.v4l2_control()
cp.id = v4l2.V4L2_CID_EXPOSURE
cp.value = int(val)
fcntl.ioctl(vd, v4l2.VIDIOC_S_CTRL, cp)
vd.close()
def queryctrl_print(queryctrl):
print 'Control: %s' % queryctrl.name
print ' Range: %d - %d' % (queryctrl.minimum, queryctrl.maximum)
control = v4l2.v4l2_control(queryctrl.id)
fcntl.ioctl(fd, v4l2.VIDIOC_G_CTRL, control)
print ' Id: %d' % control.id
print ' Value: %d' % control.value
def SetControlValue(self, qcid, val):
ctrl = v4l2.v4l2_control()
ctrl.id = qcid
ctrl.value = val
xioctl(self.vd, v4l2.VIDIOC_S_CTRL, ctrl)
if self.verbose:
print '--SetControlValue'
print ' + ID:', ctrl.id
print ' + Value:', ctrl.value
def set_ctrl(dev, ctrl, value):
sctrl = v4l2.v4l2_control()
sctrl.id = ctrl.id
sctrl.value = value
try:
fcntl.ioctl(dev, v4l2.VIDIOC_S_CTRL, sctrl)
except Exception:
pass
def _check_available_control(self, v4l2_control):
control = v4l2.v4l2_control(v4l2_control)
try:
ioctl(VD, v4l2.VIDIOC_QUERYCTRL, control)
except IOError:
logging.exception('error setting control')
return False
else:
return v4l2_control
def GetControlValue(self, qcid):
ctrl = v4l2.v4l2_control()
ctrl.id = qcid
xioctl(self.vd, v4l2.VIDIOC_G_CTRL, ctrl)
if self.verbose:
print '--GetControl'
print ' + ID:', ctrl.id
print ' + Value:', ctrl.value
return ctrl.value
def get_ctrl(self, ctrl_name):
(idx, v, mn, mx) = self.controls[ctrl_name]
ctrl = v4l2.v4l2_control()
ctrl.id = idx
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_CTRL, ctrl)
self.controls[ctrl_name] = (idx, ctrl.value, mn, mx)
return ctrl.value
except:
l.error("G_CTRL failed")
def test_get_control(fd, input_or_output):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
control = v4l2.v4l2_control(queryctrl.id)
ioctl(fd, v4l2.VIDIOC_G_CTRL, control)
assert control.value >= queryctrl.minimum
assert control.value <= queryctrl.maximum
def get_ctrl(dev, ctrl):
gctrl = v4l2.v4l2_control()
gctrl.id = ctrl.id
try:
fcntl.ioctl(dev, v4l2.VIDIOC_G_CTRL, gctrl)
return gctrl.value
except Exception:
return None
def get_ctrl(self, ctrl_name):
(idx, v, mn, mx) = self.controls[ctrl_name]
ctrl = v4l2.v4l2_control()
ctrl.id = idx
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_CTRL, ctrl)
self.controls[ctrl_name] = (idx, ctrl.value, mn, mx)
return ctrl.value
except:
l.error("G_CTRL failed")
def test_get_control(fd, input_or_output):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
control = v4l2.v4l2_control(queryctrl.id)
ioctl(fd, v4l2.VIDIOC_G_CTRL, control)
assert control.value >= queryctrl.minimum
assert control.value <= queryctrl.maximum
def ctrl_get(fd, name):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
if queryctrl.name != name:
continue
control = v4l2.v4l2_control(queryctrl.id)
fcntl.ioctl(fd, v4l2.VIDIOC_G_CTRL, control)
return control.value
raise ValueError("Failed to find control %s" % name)
def ctrl_get(fd, name):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
if queryctrl.name != name:
continue
control = v4l2.v4l2_control(queryctrl.id)
fcntl.ioctl(fd, v4l2.VIDIOC_G_CTRL, control)
return control.value
raise ValueError("Failed to find control %s" % name)
def set_ctrl(self, ctrl_name, val):
(idx, v, mn, mx) = self.controls[ctrl_name]
if val > mx: val = mx
if val < mn: val = mn
ctrl = v4l2.v4l2_control()
ctrl.id = idx
ctrl.value = val
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_S_CTRL, ctrl)
self.controls[ctrl_name] = (idx, ctrl.value, mn, mx)
l.debug("New controls: ", str(self.controls))
except:
l.error("S_CTRL failed")
def set_ctrl(self, ctrl_name, val):
(idx, v, mn, mx) = self.controls[ctrl_name]
if val > mx: val = mx
if val < mn: val = mn
ctrl = v4l2.v4l2_control()
ctrl.id = idx
ctrl.value = val
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_S_CTRL, ctrl)
self.controls[ctrl_name] = (idx, ctrl.value, mn, mx)
l.debug("New controls: ", str(self.controls))
except:
l.error("S_CTRL failed")
def ctrl_set(fd, name, value):
for queryctrl in get_device_controls(fd):
if queryctrl.flags & v4l2.V4L2_CTRL_FLAG_DISABLED:
continue
if queryctrl.name != name:
continue
if value < queryctrl.minimum or value > queryctrl.maximum:
raise ValueError("Require %d <= %d <= %d" % (queryctrl.minimum, value, queryctrl.maximum))
control = v4l2.v4l2_control(queryctrl.id, value)
fcntl.ioctl(fd, v4l2.VIDIOC_S_CTRL, control)
return
raise ValueError("Failed to find control %s" % name)
def __capture_image_cb(self, w):
if int(self._bracketing) > 0:
v4l2_control = v4l2.V4L2_CID_EXPOSURE
if self._check_available_control(v4l2_control):
self._control = v4l2.v4l2_control(v4l2_control)
ioctl(VD, v4l2.VIDIOC_G_CTRL, self._control)
self._exposure_value = self._control.value
gobject.timeout_add((1000 * int(self._delay)),
self.__delayed_capture_image_cb, w)
# two more pictures
self._bracketing_count = 2
else:
gobject.timeout_add((1000 * int(self._delay)),
self.__delayed_capture_image_cb, w)
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 set_value(controlid):
vd = open('/dev/video0', 'rb+', buffering=0)
vctrl = v4l2.v4l2_control()
vctrl.id = controlid
vctrl.value = 0 # testing with 0, should read from widget
fcntl.ioctl(vd, v4l2.VIDIOC_S_CTRL, vctrl)
import time
from fcntl import ioctl
vd = open('/dev/video0', 'r') # 打开视频设备文件
vd = os.open('/dev/video0', os.O_RDWR, 0)
cp = v4l2.v4l2_capability() # 查询视频设备的能力
print(fcntl.ioctl(vd, v4l2.VIDIOC_QUERYCAP, cp))
print(cp.driver) # 驱动名字
print(cp.card) # 设备名字
fmt = v4l2.v4l2_fmtdesc() # 查询视频设备的能力, 支持Motion-JPEG和YUYV4:2:2
fmt.index = 1
fmt.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
print(fcntl.ioctl(vd, v4l2.VIDIOC_ENUM_FMT, fmt))
print(fmt.index, fmt.description)
print('------------------------------------------------')
# 控制曝光
ctrl = v4l2.v4l2_control() # 括号漏了,各种报错...
ctrl.id = v4l2.V4L2_CID_EXPOSURE_AUTO
ctrl.value = v4l2.V4L2_EXPOSURE_MANUAL # 只能是V4L2_EXPOSURE_MANUAL 或V4L2_EXPOSURE_APERTURE_PRIORITY
fcntl.ioctl(vd, v4l2.VIDIOC_S_CTRL, ctrl)
# print('exposure auto type: ', ctrl.value)
#
# ctrl1 = v4l2.v4l2_control()
# ctrl1.id = v4l2.V4L2_CID_EXPOSURE_ABSOLUTE
# ctrl1.value = 12
# fcntl.ioctl(vd, v4l2.VIDIOC_S_CTRL, ctrl1)
# fcntl.ioctl(vd, v4l2.VIDIOC_G_CTRL, ctrl1)
# print('exposure time: ', ctrl1.value)
# ctrl2 = v4l2.v4l2_control()
# ctrl2.id = v4l2.V4L2_CID_SHARPNESS
def update_brightness(self, value):
c = v4l2.v4l2_control()
c.id = v4l2.V4L2_CID_BRIGHTNESS
c.value = value
fcntl.ioctl(self.video, v4l2.VIDIOC_S_CTRL, c)
def update_exposure(self, value):
c = v4l2.v4l2_control()
c.id = v4l2.V4L2_CID_EXPOSURE_ABSOLUTE
c.value = value
fcntl.ioctl(self.video, v4l2.VIDIOC_S_CTRL, c)
def __init__(self):
self.W = 1920
self.H = 1080
self.controls = {}
#open
l.debug("open")
self.vd = open('/dev/video0', 'rb+', buffering=0)
#queryctrl/g_ctrl
qctrl = v4l2.v4l2_queryctrl()
ctrl = v4l2.v4l2_control()
#brightness
qctrl.id = v4l2.V4L2_CID_BRIGHTNESS
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYCTRL, qctrl)
ctrl.id = qctrl.id
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_CTRL, ctrl)
except:
l.error("QUERYCTRL/G_CTRL failed")
self.controls["brightness"] = (ctrl.id, ctrl.value, qctrl.minimum, qctrl.maximum)
#exposure
qctrl.id = v4l2.V4L2_CID_EXPOSURE_ABSOLUTE
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYCTRL, qctrl)
ctrl.id = qctrl.id
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_CTRL, ctrl)
except:
l.error("QUERYCTRL/G_CTRL failed")
self.controls["exposure"] = (ctrl.id, ctrl.value, qctrl.minimum, qctrl.maximum)
#querycap
l.debug("querycap")
cp = v4l2.v4l2_capability()
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYCAP, cp)
#s_fmt
l.debug("s_fmt")
fmt = v4l2.v4l2_format()
fmt.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
fmt.fmt.pix.width = self.W
fmt.fmt.pix.height = self.H
fmt.fmt.pix.pixelformat = v4l2.V4L2_PIX_FMT_SBGGR10
fmt.fmt.pix.field = v4l2.V4L2_FIELD_NONE
fcntl.ioctl(self.vd, v4l2.VIDIOC_S_FMT, fmt)
#g_fmt
fmt = v4l2.v4l2_format()
fmt.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_FMT, fmt)
self.framesize = fmt.fmt.pix.sizeimage
#reqbufs
l.debug("reqbufs")
req = v4l2.v4l2_requestbuffers()
req.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
req.memory = v4l2.V4L2_MEMORY_MMAP
req.count = 4
fcntl.ioctl(self.vd, v4l2.VIDIOC_REQBUFS, req)
self.buffers = []
for ind in range(req.count):
#querybufs
buf = v4l2.v4l2_buffer()
buf.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
buf.memory = v4l2.V4L2_MEMORY_MMAP
buf.index = ind
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYBUF, buf)
#mmap
mm = mmap.mmap(self.vd.fileno(), buf.length, mmap.MAP_SHARED, mmap.PROT_READ | mmap.PROT_WRITE, offset=buf.m.offset)
self.buffers.append(mm)
#qbuf
fcntl.ioctl(self.vd, v4l2.VIDIOC_QBUF, buf)
#streamon
l.debug("streamon")
buf_type = v4l2.v4l2_buf_type(v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE)
fcntl.ioctl(self.vd, v4l2.VIDIOC_STREAMON, buf_type)
#select
l.debug("select")
t0 = time.time()
max_t = 1
ready_to_read, ready_to_write, in_error = ([], [], [])
while len(ready_to_read) == 0 and time.time() - t0 < max_t:
ready_to_read, ready_to_write, in_error = select.select([self.vd], [], [], max_t)
def __init__(self, primary_text, v4l2_control = False,
v4l2_auto_control = False):
Palette.__init__(self, label=primary_text)
vbox = gtk.VBox()
self.set_content(vbox)
vbox.show()
if v4l2_control:
self._query_control = v4l2.v4l2_queryctrl(v4l2_control)
self._control = v4l2.v4l2_control(v4l2_control)
ioctl(VD, v4l2.VIDIOC_QUERYCTRL, self._query_control)
ioctl(VD, v4l2.VIDIOC_G_CTRL, self._control)
_max = self._query_control.maximum
_min = self._query_control.minimum
if v4l2_control == v4l2.V4L2_CID_EXPOSURE:
_min = 0
_max = 512
elif v4l2_control == v4l2.V4L2_CID_GAIN:
_min = 0
_max = 37
elif v4l2_control == v4l2.V4L2_CID_CONTRAST:
_min = 0
_max = 127
elif v4l2_control == v4l2.V4L2_CID_BRIGHTNESS:
_min = 0
_max = 255
#elif v4l2_control == v4l2.V4L2_CID_NIGHT_MODE:
# _min = 0
# _max = 1
self._adjustment = gtk.Adjustment(value=self._control.value,
lower=_min,
upper=_max,
step_incr=1, page_incr=1, page_size=0)
self._hscale = gtk.HScale(self._adjustment)
self._hscale.set_digits(0)
self._hscale.set_draw_value(False)
self._hscale.set_update_policy(gtk.UPDATE_DISCONTINUOUS)
vbox.add(self._hscale)
self._hscale.show()
self._adjustment_handler_id = \
self._adjustment.connect('value_changed',
self.__adjustment_changed_cb)
if v4l2_auto_control:
self._auto_query_control =\
v4l2.v4l2_queryctrl(v4l2_auto_control)
self._auto_control = v4l2.v4l2_control(v4l2_auto_control)
self._auto_button = gtk.CheckButton('Auto')
self._auto_button.set_active(self._auto_control.value)
self._auto_button.connect('toggled',
self.__auto_button_toggled_cb)
vbox.add(self._auto_button)
self._auto_button.show()
if self._auto_control.value == True:
self._hscale.set_sensitive(False)
vbox.show()
def _set_ctrl(self, ctrl_id, value, desc):
ctrl = v4l2.v4l2_control(id=ctrl_id, value=value)
self._v4l2_ioctl_nonfatal(v4l2.VIDIOC_S_CTRL, ctrl,
'failed to set control: {}'.format(desc))
import select
import time
import v4l2
import fcntl
if __name__ == '__main__':
#cap = cv2.VideoCapture(0)
#cap.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, 1920) # <-- this doesn't work. OpenCV tries to set VIDIO_S_CROP instead of the frame format
#cap.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, 1080)
# The following is from: https://github.com/gebart/python-v4l2capture
# Open the video device.
video1 = v4l2capture.Video_device("/dev/video2")
c = v4l2.v4l2_control()
c.id = v4l2.V4L2_CID_EXPOSURE_ABSOLUTE
c.value = 50
fcntl.ioctl(video1, v4l2.VIDIOC_S_CTRL, c)
time.sleep(1)
# Suggest an image size to the device. The device may choose and
# return another size if it doesn't support the suggested one.
size_x, size_y = video1.set_format(1280, 960, 1)
print "device chose {0}x{1} res".format(size_x, size_y)
# Create a buffer to store image data in. This must be done before
# calling 'start' if v4l2capture is compiled with libv4l2. Otherwise
# raises IOError.
video1.create_buffers(1)
def update_privacy(self, value):
c = v4l2.v4l2_control()
c.id = v4l2.V4L2_CID_PRIVACY
#c.value = cam_data["privacy"]
c.value = value
fcntl.ioctl(self.video, v4l2.VIDIOC_S_CTRL, c)
def __init__(self):
self.W = 1920
self.H = 1080
self.controls = {}
#open
l.debug("open")
self.vd = open('/dev/video0', 'rb+', buffering=0)
#queryctrl/g_ctrl
qctrl = v4l2.v4l2_queryctrl()
ctrl = v4l2.v4l2_control()
#brightness
qctrl.id = v4l2.V4L2_CID_BRIGHTNESS
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYCTRL, qctrl)
ctrl.id = qctrl.id
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_CTRL, ctrl)
except:
l.error("QUERYCTRL/G_CTRL failed")
self.controls["brightness"] = (ctrl.id, ctrl.value, qctrl.minimum,
qctrl.maximum)
#exposure
qctrl.id = v4l2.V4L2_CID_EXPOSURE_ABSOLUTE
try:
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYCTRL, qctrl)
ctrl.id = qctrl.id
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_CTRL, ctrl)
except:
l.error("QUERYCTRL/G_CTRL failed")
self.controls["exposure"] = (ctrl.id, ctrl.value, qctrl.minimum,
qctrl.maximum)
#querycap
l.debug("querycap")
cp = v4l2.v4l2_capability()
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYCAP, cp)
#s_fmt
l.debug("s_fmt")
fmt = v4l2.v4l2_format()
fmt.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
fmt.fmt.pix.width = self.W
fmt.fmt.pix.height = self.H
fmt.fmt.pix.pixelformat = v4l2.V4L2_PIX_FMT_SBGGR10
fmt.fmt.pix.field = v4l2.V4L2_FIELD_NONE
fcntl.ioctl(self.vd, v4l2.VIDIOC_S_FMT, fmt)
#g_fmt
fmt = v4l2.v4l2_format()
fmt.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
fcntl.ioctl(self.vd, v4l2.VIDIOC_G_FMT, fmt)
self.framesize = fmt.fmt.pix.sizeimage
#reqbufs
l.debug("reqbufs")
req = v4l2.v4l2_requestbuffers()
req.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
req.memory = v4l2.V4L2_MEMORY_MMAP
req.count = 4
fcntl.ioctl(self.vd, v4l2.VIDIOC_REQBUFS, req)
self.buffers = []
for ind in range(req.count):
#querybufs
buf = v4l2.v4l2_buffer()
buf.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE
buf.memory = v4l2.V4L2_MEMORY_MMAP
buf.index = ind
fcntl.ioctl(self.vd, v4l2.VIDIOC_QUERYBUF, buf)
#mmap
mm = mmap.mmap(self.vd.fileno(),
buf.length,
mmap.MAP_SHARED,
mmap.PROT_READ | mmap.PROT_WRITE,
offset=buf.m.offset)
self.buffers.append(mm)
#qbuf
fcntl.ioctl(self.vd, v4l2.VIDIOC_QBUF, buf)
#streamon
l.debug("streamon")
buf_type = v4l2.v4l2_buf_type(v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE)
fcntl.ioctl(self.vd, v4l2.VIDIOC_STREAMON, buf_type)
#select
l.debug("select")
t0 = time.time()
max_t = 1
ready_to_read, ready_to_write, in_error = ([], [], [])
while len(ready_to_read) == 0 and time.time() - t0 < max_t:
ready_to_read, ready_to_write, in_error = select.select([self.vd],
[], [],
max_t)
