How to cross-compile Linux v4l-utils dependency library?

2023-04-27

Products / Plugins:Video Call / Audio Call

Platform / Framework:Linux

This article will introduce cross-compiling v4l-utils (libv4l) for an aarch64 architecture embedded machine on an x86_64 machine running Ubuntu 20.04 as an example.

Install the dependency libraries required to compile v4l-utils.

$ apt update
$ apt install make automake libtool

$ apt update
$ apt install make automake libtool

Install the cross-compilation toolchain.

Note

This example installs the latest version of the GNU GCC toolchain. Please install the correct cross-compilation toolchain for your embedded machine according to your actual situation.

$ apt update
$ apt install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu

$ apt update
$ apt install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu

Download the latest version of V4l-utils source code from V4l official website and extract it.

For example, download v4l-utils-1.22.1.tar.bz2 locally.

$ wget https://linuxtv.org/downloads/v4l-utils/v4l-utils-1.22.1.tar.bz2
$ tar xf v4l-utils-1.22.1.tar.bz2
$ cd v4l-utils-1.22.1

$ wget https://linuxtv.org/downloads/v4l-utils/v4l-utils-1.22.1.tar.bz2
$ tar xf v4l-utils-1.22.1.tar.bz2
$ cd v4l-utils-1.22.1

Then extract the source code through tar and cd into the directory.

Note

If you cannot find "wget", you can install "wget" through apt install wget.
If "tar" extraction fails, it may be because the system does not have the "bzip2" library installed. You can install it through apt install bzip2.

Generate the configuration file through ./configure.
```
$ ./configure --disable-doxygen-doc --without-jpeg --with-pic \
    --host=aarch64-linux-gnu --prefix=/usr/aarch64-linux-gnu
```
```
$ ./configure --disable-doxygen-doc --without-jpeg --with-pic \
    --host=aarch64-linux-gnu --prefix=/usr/aarch64-linux-gnu
```
- Specify the cross-compilation target as aarch64-linux-gnu through the --host parameter. You need to modify this according to your actual situation to your cross-compilation target.
- Specify the installation path as /usr/aarch64-linux-gnu through the --prefix parameter. You need to modify this according to your actual situation to the installation path of your cross-compilation toolchain.
Specify the number of parallel tasks for concurrent compilation through the -j parameter, or compile directly through make.
```
$ make -j$(nproc)
```
```
$ make -j$(nproc)
```

Note

If you encounter "std" related errors during compilation, it may be because your compiler version is too low. You can try to specify the use of gnu++11 to compile C++ code by executing export CXXFLAGS="-std=gnu++11" before executing the ./configure in step 4.

Install v4l-utils to the installation path of the cross-compilation toolchain through make install, which is the path specified by the prefix parameter in step 4.
```
$ make install
```
```
$ make install
```