Sensoray 2253 Linux - Manual (Page 17)

VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP
int ioctl(int fd, int request, v4l2_jpegcompression *jc);
jc->quality
Integer range 10 to 90. The default is 75.
V4L2_PIX_FMT_MJPEG must be selected.
VIDIOC_ENUM_INPUT, VIDIOC_G_INPUT, VIDIOC_S_INPUT
int ioctl(int fd, int request, struct v4l2_input *inp);
There is only one input at index 0, named “Composite”.
The inp->status field may have the bit V4L2_IN_ST_NO_H_LOCK set if the
device was unable to lock the input video signal.
VIDIOC_ENUM_OUTPUT, VIDIOC_G_OUTPUT, VIDIOC_S_OUTPUT
int ioctl(int fd, int request, struct v4l2_output *inp);
There is only one output at index 0, named “Composite”.
VIDIOC_QUERYCTRL, VIDIOC_G_CTRL, VIDIOC_S_CTRL,
VIDIOC_TRY_EXT_CTRLS, VIDIOC_G_EXT_CTRLS,
VIDIOC_S_EXT_CTRLS
int ioctl(int fd, int request, struct v4l2_ext_controls *ctrls);
When using VIDIOC_G_CTRL or VIDIOC_S_CTRL,
or ctrls->ctrl_class == V4L2_CTRL_CLASS_USER,
the supported ctrls->controls id identifiers and values are:
V4L2_CID_BRIGHTNESS : 0 to 255, default 128. Capture only.
V4L2_CID_CONTRAST: 0 to 255, default 128. Capture only.
V4L2_CID_SATURATION: 0 to 255, default 128. Capture only.
V4L2_CID_HUE: -128 to 128, default 0. Capture only.
V4L2_CID_AUDIO_VOLUME: 0 to 119 for capture, 0 to 117 for output.
V4L2_CID_AUDIO_BALANCE: -100 to 100, default 0.
V4L2_CID_HFLIP: boolean horizontal flip, default 0. Capture only.
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