Trait v4l::buffer::Arena

pub trait Arena {
    type Buffer;
    fn allocate(&mut self, count: u32) -> Result<u32>;
    fn release(&mut self) -> Result<()>;
    fn queue(&mut self) -> Result<()>;
    fn dequeue(&mut self) -> Result<Self::Buffer>;
}

Manage buffers for a device

Associated Types

type Buffer

Type of the buffers (DMA, mmap, userptr)

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Required methods

fn allocate(&mut self, count: u32) -> Result<u32>

Allocate buffers

Returns the number of buffers as reported by the driver.

Arguments

• count - Desired number of buffers

fn release(&mut self) -> Result<()>

Release any allocated buffers

fn queue(&mut self) -> Result<()>

Queue a new buffer on the device

Queueing usually causes the camera hardware to take a picture. Dequeuing then transfers it to application visible memory.

fn dequeue(&mut self) -> Result<Self::Buffer>

Dequeue a buffer and return it to the application

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Implementors

impl<'a> Arena for v4l::io::mmap::arena::Arena<'a>

type Buffer = Buffer<'a>

fn allocate(&mut self, count: u32) -> Result<u32>

fn release(&mut self) -> Result<()>

fn queue(&mut self) -> Result<()>

fn dequeue(&mut self) -> Result<Self::Buffer>

impl<'a> Arena for v4l::io::userptr::arena::Arena<'a>

type Buffer = Buffer<'a>

fn allocate(&mut self, count: u32) -> Result<u32>

fn release(&mut self) -> Result<()>

fn queue(&mut self) -> Result<()>

fn dequeue(&mut self) -> Result<Self::Buffer>

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