Struct V4l2Device 

pub struct V4l2Device { /* private fields */ }

V4L2 device instance

Implementations

impl V4l2Device

pub const fn new() -> Self

Create a new V4L2 device

pub fn init(&mut self)

Initialize the device

pub fn query_cap(&self) -> V4l2Capability

Handle VIDIOC_QUERYCAP

pub fn enum_fmt(&self, index: u32) -> Option<V4l2FmtDesc>

Handle VIDIOC_ENUM_FMT

pub fn get_format(&self) -> V4l2PixFormat

Handle VIDIOC_G_FMT

pub fn set_format( &mut self, fmt: V4l2PixFormat, ) -> Result<V4l2PixFormat, KernelError>

Handle VIDIOC_S_FMT

pub fn request_buffers(&mut self, count: u32) -> Result<u32, KernelError>

Handle VIDIOC_REQBUFS

pub fn query_buffer(&self, index: u32) -> Option<V4l2Buffer>

Handle VIDIOC_QUERYBUF

pub fn queue_buffer(&mut self, index: u32) -> Result<(), KernelError>

Handle VIDIOC_QBUF – queue a buffer for capture

pub fn dequeue_buffer(&mut self) -> Result<V4l2Buffer, KernelError>

Handle VIDIOC_DQBUF – dequeue a filled buffer

pub fn stream_on(&mut self) -> Result<(), KernelError>

Handle VIDIOC_STREAMON

pub fn stream_off(&mut self) -> Result<(), KernelError>

Handle VIDIOC_STREAMOFF

pub fn generate_test_frame( &mut self, output: &mut [u8], ) -> Result<usize, KernelError>

Generate a test frame into a queued buffer

Produces SMPTE-style color bars in YUYV 4:2:2 format. Called by the capture loop to fill queued buffers.

pub fn is_streaming(&self) -> bool

Check if the device is currently streaming

pub fn frame_counter(&self) -> u32

Get the current frame counter

pub fn num_buffers(&self) -> u32

Get the number of allocated buffers

Trait Implementations

impl Default for V4l2Device

fn default() -> Self

Returns the “default value” for a type.