Module v4l2out 

Kernel-device sink: writes frames into a v4l2loopback output device.

Where the host (or a privileged container) carries the v4l2loopback module, a real /dev/videoN is the zero-configuration path for consumers — no preload, no socket — exactly as /dev/uinput is for the gamepads. The device is opened for output, set to the ring’s raw format, and fed one write() per published frame. It is a best-effort mirror of the ring: an error disables the sink and is reported once, never failing the camera.

Structs

V4l2Capability 🔒

V4l2Format 🔒

struct v4l2_format: the type word, padding to the 8-byte aligned union, then the union’s 200 bytes, of which the pixel format occupies the first 48.

V4l2Output

V4l2PixFormat 🔒

Constants

IOC_READ 🔒

IOC_WRITE 🔒

V4L2_BUF_TYPE_VIDEO_OUTPUT 🔒

V4L2_CAP_DEVICE_CAPS 🔒

V4L2_CAP_READWRITE 🔒

V4L2_CAP_VIDEO_OUTPUT 🔒

V4L2_COLORSPACE_SMPTE170M 🔒

V4L2_COLORSPACE_SRGB 🔒

V4L2_FIELD_NONE 🔒

VIDIOC_QUERYCAP 🔒

VIDIOC_S_FMT 🔒

Functions

cstr_field 🔒

fourcc_str

ioc 🔒

is_loopback_output 🔒

query_cap 🔒