Method list_devices

rustcv-backend-avf/src/lib.rs:37–68

(&self)

impl Driver for AvfDriver {
    fn list_devices(&self) -> Result<Vec<DeviceInfo>, CameraError> {
        let mut result = Vec::new();
        unsafe {
            // AVCaptureDeviceTypeExternalUnknown is deprecated, use AVCaptureDeviceTypeExternal
            let types = NSArray::from_slice(&[
                AVCaptureDeviceTypeBuiltInWideAngleCamera,
                AVCaptureDeviceTypeExternal,
            ]);

            // 直接获取 session，不需要 Option 解包
            // 这个方法返回 Retained<AVCaptureDeviceDiscoverySession>，永远不为 nil
            let session =
                AVCaptureDeviceDiscoverySession::discoverySessionWithDeviceTypes_mediaType_position(
                    &types,
                    AVMediaTypeVideo,
                    AVCaptureDevicePosition::Unspecified,
                );

            // 直接遍历
            // session.devices() 返回 Retained<NSArray<AVCaptureDevice>>
            // 这是一个实现了 IntoIterator 的类型
            for dev in session.devices() {
                result.push(DeviceInfo {
                    name: dev.localizedName().to_string(),
                    id: dev.uniqueID().to_string(),
                    backend: "AVFoundation".to_string(),
                    bus_info: None,
                });
            }
        }
        Ok(result)
    }

    fn open(
        &self,