Struct Request 

pub struct Request<'a> { /* private fields */ }

A request associated with a media device.

Details

This is a wrapper for the media control API’s request, which is tied to a specific media device.

Implementations

impl<'a> Request<'a>

pub fn new(media_fd: BorrowedFd<'a>) -> Result<Self>

pub fn new_request(&self) -> Result<Self>

Allocate a new request on the same media device

pub fn init(&mut self) -> Result<()>

Initializes the request for recycling without re-allocating it.

Details

Reinitializes the request, provided that it has not been queued yet or that it has already been queued and completed. After reinitialization, the request is ready to be queued again for subsequent operations.

Errors

If the request is still queued and has not yet completed, this function returns error::Error::DeviceIsBusy. No other errors are possible.

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

Enqueue the request

Errors

• RequestIsAlreadyQueued : The request was already queued or the application queued the first buffer directly, but later attempted to use a request. It is not permitted to mix the two APIs.
• RequestNotContainBuffers : The request did not contain any buffers. All requests are required to have at least one buffer. This can also be returned if some required configuration is missing in the request.
• OutOfMemory : Out of memory when allocating internal data structures for this request.
• RequestHasInvalidData : The request has invalid data.
• HardwareBadState : The hardware is in a bad state. To recover, the application needs to stop streaming to reset the hardware state and then try to restart streaming.

Trait Implementations

impl<'a> Debug for Request<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.