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One-KVM/libs/v4l2r/README.md
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Rust bindings for V4L2

This is a vendored, One-KVM-specific subset of v4l2r.

It keeps only the pieces needed for video capture:

  • generated Linux V4L2 bindings,
  • safe low-level ioctl wrappers used by capture and device probing,
  • memory handle helpers for MMAP, USERPTR, and DMABUF,
  • core V4L2 types such as Format, PixelFormat, and QueueType.

The upstream crate also contains high-level device abstractions, stateful decoder/encoder helpers, stateless codec controls, examples, and C FFI. Those parts are intentionally removed here so this dependency stays scoped to capture.

Build options

cargo build generates V4L2 bindings from /usr/include/linux/videodev2.h by default. Set V4L2R_VIDEODEV2_H_PATH to a directory containing videodev2.h to generate bindings from a different header.

For Android targets, the build script uses the Android NDK sysroot. Set one of ANDROID_NDK_HOME, ANDROID_NDK_ROOT, NDK_HOME, ANDROID_HOME, or ANDROID_SDK_ROOT if the NDK cannot be found automatically.