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  • Download USB Camera - Connect EasyCap or USB WebCam for Android to the Pro version provides some extra features (e.g.

Android Smartphone As USB (!!) Webcam: Over the last few months we've all been forced to communicate online rather than in person. As a student, most of my lectures turned into Zoom meetings, and the same happened to my tutoring hours. In the next few weeks, many students of all ages wil. USB Drivers for Android is a mobile application that allows you to connect your Android device to your computer in the event that your device is not compatible with your PC. This makes it possible to easily sync your data and manage your contacts via your computer using only a USB cable.

The Android platform supports the use of plug-and-play USB cameras (that is,webcams) using the standardAndroid Camera2 API and the cameraHIDL interface. Webcams generally supportUSB video class (UVC) drivers and on Linux, the standardVideo4Linux (V4L) driver is used to control UVC cameras.

With support for webcams, devices can be used in lightweight use cases such asvideo chatting and photo kiosks. This feature doesn't replace typical internalcamera HALs on Android phones and isn't designed tosupport performance-intensive, complex tasks involving high-resolution andhigh-speed streaming, AR, and manual ISP/sensor/lens control.

The USB camera HAL process is part of the external camera provider thatlistens to USB device availability and enumerates external camera devicesaccordingly. The process has permissions and an SE policy similar to thebuilt-in camera HAL process. Third-party webcam apps that communicatedirectly with USB devices require the same camera permissions to access UVCdevices as with any regular camera app.

Examples and sources

For more information on how to implement USB cameras, see an external cameraprovider reference implementation atExternalCameraProviderImpl_2_4.The external camera device and session implementations are included inExternalCameraDevice andExternalCameraDeviceSession.Starting in API level 28, the Java client API includes theEXTERNAL hardware level.

Implementation

The implementation must support theandroid.hardware.usb.host system feature.

Kernel support for UVC devices must also be enabled. You can enable this byadding the following to the respective kernel deconfig files.

Note: Make sure you also have thispatch for UVC video.

To enable the external camera provider in the respective device build, whichadds the necessary SELinux permissions, external camera configuration, andexternal camera provider dependency, complete the following steps:

  • Add the external camera config file and external camera library todevice.mk.

  • Add the external camera provider name to the device Treble HAL manifest.

  • (Optional) If the device runs in Treble passthrough mode, update sepolicyso cameraserver can access the UVC camera.

Here's an example of external_camera_config.xml (copyright lines omitted).

Customization

You can enhance the Android camera either through general customization optionsor device-specific optimizations.

General customizations

You can customize the external camera provider by modifying theexternal_camera_config.xml file. Awp050 mac owners manual. Specifically, clients can customize thefollowing parameters:

  • Excluding video nodes of internal cameras
  • Supported image size and frame rate upper bound
  • Number of inflight buffers (jank vs memory tradeoff)

In addition to these parameters, you can add your own parameters or develop yourown configurations.

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Device-specific optimizations

You can also improve performance by adding device-specific optimizations.

Buffer copy/scaling and JPEG decode/encode

Generic implementations use CPU (libyuv/libjpeg) but you can replace this withdevice-specific optimizations.

HAL output format

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Generic implementations use the following output formats:

  • YUV_420_888 for video IMPLEMENTATION_DEFINED buffers
  • YUV12 for all other IMPLEMENTATION_DEFINED buffers

To improve performance, you can replace output formats with device-specificefficient formats. You can also support additional formats in a customizedimplementation

Validation

Devices with external camera support must passcamera CTS. The external USBwebcam must remain plugged in the specific device during the entire test run,otherwise some test cases will fail.

Note:

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media_profiles entries aren't available for external USB webcams, socamcorder profiles are absent.