DFK / VIDIOC_S_CTRL Problem

[Amanda-M-UK]

Hello Everyone

I am in the process of writing a Linux application to control the Imaging Source USB cameras and testing with both a DMK21 (GREY) and an DFK colour camera. However, I have run into a problem.

I have written the following code to update the Gamma (Or indeed, any camera parameters I choose to set). This code snippet works perfectly with normal webcams (that is, the gamma is updated when cam_ctrl_gamma is changed) but does nothing with the DFK / DMK cameras.

Does anybody know what I am doing wrong?

struct v4l2_control control; memset(&control, 0, sizeof (control));

control.id = V4L2_CID_GAMMA; control.value = cam_ctrl_gamma;

if (ioctl(fd, VIDIOC_S_CTRL, &control) < 0) { cerr << "ERROR: " + (string) strerror(errno) << "\n"; return; }`

Kind Regards Amanda

[TIS-Stefan]

Hello

I would like you to try that with guvcview. On my computer, gamma works as expected. Please let me know your results. I suppose, you installed the rules.

[Amanda-M-UK]

Hi Stefan and thanks for your response.

I have tested on guvcview and it has the same problem so it doesn't look like it's a problem with my code. BTW: It's not only a problem with the Gamma—all user controls don't work. I have installed the UDEV rules.

Any idea?

Kind Regards Amanda

[Amanda-M-UK]

Sorry, forgot to add. I am using Fedora 23, Kernel version 4.5.7

Many thanks Amanda

[TIS-Stefan]

I have no real idea, since it works fine on my machine. But I installed the UVC extension Unit. https://github.com/TheImagingSource/tiscamera/wiki/UVC-Extension-Units Maybe this makes the difference?

I am not sure, whether the Kernel make the difference. I use 3.13

[Amanda-M-UK]

Hi Stefan

The first time I tried installing the extension units I lots of errors. I have downloaded the XML again and this time I got less errors but still not running correctly. There seems to be lots of no such file or directory errors.Any idea what I am missing?

sudo uvcdynctrl -i tisEUVC.xml -d /dev/video1 [libwebcam] Unknown V4L2 user control ID encountered: 0x0098090E (V4L2_CID_USER_BASE + 14) [libwebcam] Unknown V4L2 user control ID encountered: 0x0098090F (V4L2_CID_USER_BASE + 15) Importing dynamic controls from file tisEUVC.xml. tisEUVC.xml: error: video1: unable to map 'ExtIO' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'GainR' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'GainG' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'GainB' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'Trigger' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'Trigger Global Reset Shutter' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'Software Trigger' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'Binning' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'Skipping' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'X Offset' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory) tisEUVC.xml: error: video1: unable to map 'Y Offset' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 2: No such file or directory)

[TIS-Stefan]

For using the tisEUVC.xml file you can use the scripts from https://github.com/TheImagingSource/tiscamera/tree/beta-release/tools/uvcctls

But they are not needed for gamma of a DMK 21AU04. This must simply work. Is there an output of guvcview, if you change gamma? what does v4l2-ctl --all say?

[Amanda-M-UK]

Hello Stefan

I have tested guvcview again and none of the sliders have any effect on the DFK output. Here is the output of v4l2-ctl --all

Driver Info (not using libv4l2): Driver name : uvcvideo Card type : DFx 21AU04.AS Bus info : usb-0000:00:14.0-1 Driver version: 4.5.7 Capabilities : 0x84200001 Video Capture Streaming Extended Pix Format Device Capabilities Device Caps : 0x04200001 Video Capture Streaming Extended Pix Format Priority: 2 Video input : 0 (Camera 1: ok) Format Video Capture: Width/Height : 640/480 Pixel Format : 'YUYV' Field : None Bytes per Line : 1280 Size Image : 614400 Colorspace : Default Transfer Function : Default YCbCr Encoding : Default Quantization : Default Flags : Crop Capability Video Capture: Bounds : Left 0, Top 0, Width 640, Height 480 Default : Left 0, Top 0, Width 640, Height 480 Pixel Aspect: 1/1 Selection: crop_default, Left 0, Top 0, Width 640, Height 480 Selection: crop_bounds, Left 0, Top 0, Width 640, Height 480 Streaming Parameters Video Capture: Capabilities : timeperframe Frames per second: 30.000 (30/1) Read buffers : 0 brightness (int) : min=0 max=63 step=1 default=0 value=48 saturation (int) : min=0 max=255 step=1 default=128 value=128 hue (int) : min=0 max=359 step=1 default=180 value=180 white_balance_component_auto (bool) : default=1 value=1 white_balance_red_component (int) : min=0 max=95 step=1 default=32 value=32 flags=inactive white_balance_blue_component (int) : min=0 max=95 step=1 default=32 value=33 flags=inactive gamma (int) : min=1 max=500 step=1 default=100 value=187 gain (int) : min=260 max=1023 step=1 default=260 value=260 exposure_auto (menu) : min=0 max=3 default=3 value=3 exposure_absolute (int) : min=1 max=36000000 step=1 default=333 value=333 flags=inactive

[TIS-Stefan]

Hello

I must admit, I have no more ideas. You do not gent an error, the properties look as expected. It works fine on my computer, thus I have no idea where to look for. Did you try the other video formats, such as Y800?

[Amanda-M-UK]

Hi Stefan

It works perfectly on Y800 (aside from my display being a strange colour because I've not yet implemented the converter). So, it appears to be a problem with YUV. I'm lost on this one too...

[TIS-Stefan]

Hi Ishtar

Y800 should not give a strange color. It gives a b/w image with a checkerboard pattern. The pattern is from the bayer mosaic raw data.

In my guvcview all properties, including gamma, have the expected effect, also if I select YUYV, 640x480 at 30 fps.

I am lost here, I do not know, why it does not work on your computer. If it is possible, I would like you to test this on another computer, e.g. Windows or Ubuntu.

[Amanda-M-UK]

Thanks Stefan

The reason I'm getting a greenish image is because I am using an SDL2 Texture specifically set for YUY2 and have no conversion in place yet. I will try this on another Linux system.

Thanks for your help Regards Amanda