Example of setting a control whose type is pyrav4l2.controls.MenuItem

[matanox]

Would it be very tedios to exemplify setting a control's value when the type of the control within pyrav4l2 is a pyrav4l2 MenuItem and not a plain python type?

E.g. this way is obviously wrong:

from pyrav4l2 import Device, MenuItem

dev = Device("/dev/video0")
if dev.is_video_capture_capable:

    for c in dev.controls:
        cv = dev.get_control_value(c)
        if isinstance(cv, MenuItem):
            print(f'{c.name} is {cv.name} (a MenuItem)')
            if c.name == 'LED1 Mode':
                dev.set_control_value(c, MenuItem(cv.ctrl_id, cv.index, 'On'))
            if c.name == 'LED1 Frequency':
                dev.set_control_value(c, MenuItem(cv.ctrl_id, cv.index, '10 Hz'))
        else:
            print(f'{c.name} is {cv}')

[tgorochowik]

Hi,

MenuItem is used for possible settings of Menu, so I'm assuming dev.controls contains a Menu object. This object contans .items which use the MenuItem class.

Please see this interactive example for reference:

Python 3.11.5 (main, Sep  2 2023, 14:16:33) [GCC 13.2.1 20230801] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pyrav4l2 import Device
>>> dev = Device("/dev/video0")
>>> for i, c in enumerate(dev.controls):
...     print(i, c.name, c)
... 
0 User Controls <pyrav4l2.controls.Control object at 0x7f089c5ecbd0>
1 Brightness <pyrav4l2.controls.Control object at 0x7f089c8b9a10>
2 Contrast <pyrav4l2.controls.Control object at 0x7f089c5ed290>
3 Saturation <pyrav4l2.controls.Control object at 0x7f089c5ed310>
4 Hue <pyrav4l2.controls.Control object at 0x7f089c5ed390>
5 White Balance, Automatic <pyrav4l2.controls.Control object at 0x7f089c5ed450>
6 Gamma <pyrav4l2.controls.Control object at 0x7f089c5ed490>
7 Power Line Frequency <pyrav4l2.controls.Menu object at 0x7f089c5ed710>
(...)
>>> m = dev.controls[7]
>>> for i, mi in enumerate(m.items):
...     print(i, mi.name)
... 
0 Disabled
1 50 Hz
2 60 Hz
3 Auto
>>> dev.get_control_value(m).name
'Disabled'
>>> dev.set_control_value(m, m.items[2])
>>> dev.get_control_value(m).name
'60 Hz'

I hope this helps! If in doubt, you can take a look at https://github.com/antmicro/pyvidctrl - this util utilizes pyrav4l2 quite extensively so should cover all possibilities

[matanox]

Thanks a lot! I'll check how I missed that reading the code ...