ir-bpf-decoders

Compiled IR BPF protocol decoders from utils/keytable/bpf_protocols directory of v4l-utils

Since linux kernel 4.18 additional IR protocol decoders can be added via BPF programs. This works by ir-keytable loading the BPF code into the kernel and attaching it to the rc device.

v4l-utils ships with several BPF decoders in C source code form which need to be compiled into BPF code with clang.

As the LibreELEC toolchain doesn't include clang and the BPF code is target independent this is done separately on a build host with clang installed.

Build prerequisites

Install libelf, libbpf development files and clang. eg:

apt-get install libelf-dev libbpf-dev clang

Building

Download, unpack and configure v4l-utils matching the version in LibreELEC. eg:

wget https://linuxtv.org/downloads/v4l-utils/v4l-utils-1.18.0.tar.bz2
tar xf v4l-utils-1.18.0.tar.bz2
cd v4l-utils-1.18.0
./configure

Compile BPF protocol decoders

make -C utils/keytable/bpf_protocols

Update BPF object files in this repo. eg:

cp utils/keytable/bpf_protocols/*.o ~/libreelec/ir-bpf-decoders