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//! Typed error enum for every failure path in the library.
use thiserror::Error;
/// Every error returned by `cameras`.
///
/// Matches on shape, not string text. Each variant carries the context needed to
/// diagnose the failure without having to parse a message.
#[derive(Clone, Debug, Error)]
pub enum Error {
/// The user or OS denied access to camera hardware.
#[error("camera permission denied")]
PermissionDenied,
/// The supplied [`crate::DeviceId`] did not match any currently-connected device.
#[error("device not found: {0}")]
DeviceNotFound(String),
/// Another application holds exclusive access to the camera.
#[error("device is already in use")]
DeviceInUse,
/// The requested [`crate::StreamConfig`] is not supported by the device.
#[error("requested format is not supported")]
FormatNotSupported,
/// [`crate::next_frame`] did not receive a frame before the timeout expired.
#[error("timed out waiting for frame")]
Timeout,
/// The camera stream ended (for example, the device was unplugged).
#[error("camera stream ended")]
StreamEnded,
/// MJPEG decoding via `zune-jpeg` failed.
#[error("mjpeg decode failed: {0}")]
MjpegDecode(String),
/// The current platform does not yet have a backend implementation.
#[error("{platform} backend not implemented yet")]
BackendNotImplemented {
/// Name of the platform that is missing a backend.
platform: &'static str,
},
/// Catch-all for platform-specific failures (ObjC exceptions, HRESULTs, ioctl errors).
#[error("{platform}: {message}")]
Backend {
/// Name of the platform that raised the error.
platform: &'static str,
/// Human-readable message from the underlying platform API.
message: String,
},
}