枚举系统中的摄像头设备
()
| 13 | |
| 14 | /// 枚举系统中的摄像头设备 |
| 15 | pub fn list_devices() -> Result<Vec<DeviceInfo>> { |
| 16 | let mut devices = Vec::new(); |
| 17 | |
| 18 | // 遍历 /dev/video* 节点 |
| 19 | let node_iter = v4l::context::enum_devices(); |
| 20 | |
| 21 | for node in node_iter { |
| 22 | // 尝试打开设备查询能力 |
| 23 | let path = node.path().to_string_lossy().to_string(); |
| 24 | if let Ok(dev) = v4l::Device::with_path(&path) { |
| 25 | if let Ok(caps) = dev.query_caps() { |
| 26 | // 过滤：必须支持 Video Capture (0x00000001) |
| 27 | // 忽略 Metadata 设备或 Output 设备 |
| 28 | if caps.capabilities.contains(Flags::VIDEO_CAPTURE) { |
| 29 | devices.push(DeviceInfo { |
| 30 | name: node.name().unwrap_or_else(|| "Unknown Camera".into()), |
| 31 | id: path, // /dev/video0 |
| 32 | backend: "V4L2".to_string(), |
| 33 | bus_info: Some(caps.bus), |
| 34 | }); |
| 35 | } |
| 36 | } |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | Ok(devices) |
| 41 | } |
| 42 | |
| 43 | /// 打开设备并初始化流 |
| 44 | pub fn open(id: &str, config: CameraConfig) -> Result<(Box<dyn Stream>, DeviceControls)> { |