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#![allow(clippy::manual_strip)]
use std::{any::Any, collections::HashMap, io, ptr::NonNull};
use bitflags::bitflags;
use libcamera_sys::*;
use crate::{control::ControlList, framebuffer::AsFrameBuffer, stream::Stream};
/// Status of [Request]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RequestStatus {
/// Request is ready to be executed by [ActiveCamera::queue_request()](crate::camera::ActiveCamera::queue_request)
Pending,
/// Request was executed successfully
Complete,
/// Request was cancelled, most likely due to call to [ActiveCamera::stop()](crate::camera::ActiveCamera::stop)
Cancelled,
}
impl TryFrom<libcamera_request_status_t> for RequestStatus {
type Error = String;
fn try_from(value: libcamera_request_status_t) -> Result<Self, Self::Error> {
match value {
libcamera_request_status::LIBCAMERA_REQUEST_STATUS_PENDING => Ok(Self::Pending),
libcamera_request_status::LIBCAMERA_REQUEST_STATUS_COMPLETE => Ok(Self::Complete),
libcamera_request_status::LIBCAMERA_REQUEST_STATUS_CANCELLED => Ok(Self::Cancelled),
_ => Err(format!("Unknown libcamera_request_status: {}", value)),
}
}
}
bitflags! {
/// Flags to control the behaviour of [Request::reuse()].
pub struct ReuseFlag: u32 {
/// Reuse the buffers that were previously added by [Request::add_buffer()].
const REUSE_BUFFERS = 1 << 0;
}
}
/// A camera capture request.
///
/// Capture requests are created by [ActiveCamera::create_request()](crate::camera::ActiveCamera::create_request)
/// and scheduled for execution by [ActiveCamera::queue_request()](crate::camera::ActiveCamera::queue_request).
/// Completed requests are returned by request completed callback (see
/// [ActiveCamera::on_request_completed()](crate::camera::ActiveCamera::on_request_completed)) and can (should) be
/// reused by calling [ActiveCamera::queue_request()](crate::camera::ActiveCamera::queue_request) again.
pub struct Request {
pub(crate) ptr: NonNull<libcamera_request_t>,
buffers: HashMap<Stream, Box<dyn Any + 'static>>,
}
impl Request {
pub(crate) unsafe fn from_ptr(ptr: NonNull<libcamera_request_t>) -> Self {
Self {
ptr,
buffers: Default::default(),
}
}
/// Returns an immutable reference of request controls.
///
/// See [controls](crate::controls) for available items.
pub fn controls(&self) -> &ControlList {
unsafe { ControlList::from_ptr(NonNull::new(libcamera_request_controls(self.ptr.as_ptr())).unwrap()) }
}
/// Returns a mutable reference of request controls.
///
/// See [controls](crate::controls) for available items.
pub fn controls_mut(&mut self) -> &mut ControlList {
unsafe { ControlList::from_ptr(NonNull::new(libcamera_request_controls(self.ptr.as_ptr())).unwrap()) }
}
/// Returns request metadata, which contains information relevant to the request execution (i.e. capture timestamp).
///
/// See [controls](crate::controls) for available items.
pub fn metadata(&self) -> &ControlList {
unsafe { ControlList::from_ptr(NonNull::new(libcamera_request_metadata(self.ptr.as_ptr())).unwrap()) }
}
/// Attaches framebuffer to the request.
///
/// Buffers can only be attached once. To access framebuffer after executing request use [Self::buffer()] or
/// [Self::buffer_mut()].
pub fn add_buffer<T: AsFrameBuffer + Any>(&mut self, stream: &Stream, buffer: T) -> io::Result<()> {
let ret =
unsafe { libcamera_request_add_buffer(self.ptr.as_ptr(), stream.ptr.as_ptr(), buffer.ptr().as_ptr()) };
if ret < 0 {
Err(io::Error::from_raw_os_error(ret))
} else {
self.buffers.insert(*stream, Box::new(buffer));
Ok(())
}
}
/// Returns a reference to the buffer that was attached with [Self::add_buffer()].
///
/// `T` must be equal to the type used in [Self::add_buffer()], otherwise this will return None.
pub fn buffer<T: 'static>(&self, stream: &Stream) -> Option<&T> {
self.buffers.get(stream).and_then(|b| b.downcast_ref())
}
/// Returns a mutable reference to the buffer that was attached with [Self::add_buffer()].
///
/// `T` must be equal to the type used in [Self::add_buffer()], otherwise this will return None.
pub fn buffer_mut<T: 'static>(&mut self, stream: &Stream) -> Option<&mut T> {
self.buffers.get_mut(stream).and_then(|b| b.downcast_mut())
}
/// Returns auto-incrementing sequence number of the capture
pub fn sequence(&self) -> u32 {
unsafe { libcamera_request_sequence(self.ptr.as_ptr()) }
}
/// Returns request identifier that was provided in
/// [ActiveCamera::create_request()](crate::camera::ActiveCamera::create_request).
///
/// Returns zero if cookie was not provided.
pub fn cookie(&self) -> u64 {
unsafe { libcamera_request_cookie(self.ptr.as_ptr()) }
}
/// Capture request status
pub fn status(&self) -> RequestStatus {
RequestStatus::try_from(unsafe { libcamera_request_status(self.ptr.as_ptr()) }).unwrap()
}
/// Reset the request for reuse.
///
/// Reset the status and controls associated with the request, to allow it to be reused and requeued without
/// destruction. This function shall be called prior to queueing the request to the camera, in lieu of
/// constructing a new request. The application can reuse the buffers that were previously added to the request
/// via [Self::add_buffer()] by setting flags to [ReuseFlag::REUSE_BUFFERS].
pub fn reuse(&mut self, flags: ReuseFlag) {
unsafe { libcamera_request_reuse(self.ptr.as_ptr(), flags.bits()) }
}
}
impl core::fmt::Debug for Request {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Request")
.field("seq", &self.sequence())
.field("status", &self.status())
.field("cookie", &self.cookie())
.finish()
}
}
impl Drop for Request {
fn drop(&mut self) {
unsafe { libcamera_request_destroy(self.ptr.as_ptr()) }
}
}
unsafe impl Send for Request {}