v4l2top

An htop-like utility to show v4l2 mem2mem hardware and memory usage.

Dependency

Linux needs to be patched to be able to retrieve data from the driver. A work in progress branch can be found here. It only supports the rkvdec driver, and only h264 on RK3588 for buffer details.

Installation

The crate is not published yet, use the git url to install locally with cargo:

cargo install https://github.com/cazou/v4l2top.git

Cross compiling

To build an arm64 binary, install an arm64 Rust toolchain with rustup:

rustup target add aarch64-unknown-linux-gnu

And that you have an arm64 linker. Debian:

apt install gcc-aarch64-linux-gnu

Arch Linux:

pacman -S aarch64-linux-gnu-gcc

Other linkers can be used, but adapt the .cargo/config.toml file.

Then you can cross compile for arm64 with:

cargo build --target aarch64-unknown-linux-gnu

Add --release for a smaller binary. You can retrieve it in target/aarch64-unknown-linux-gnu/[release|debug]/v4l2top