LIRC
Remote controls | LIRC |
LIRC (Linux Infrared Remote Control) is an open source package that allows users to receive and send infrared signals with a Linux-based computer system.
Overview of LIRC
Historical Information
Modern Linux kernels "unify" input signals from any input device (keyboard, mouse, remote control, touchscreen, etc.) via the Linux User API Input Subsystem, or UAPI.
Prior to the input subsystem, Infrared Remote (IR) controls were integrated to Linux via LIRC.
Kodi came into being before UAPI existed, and thus relied exclusively on LIRC. Thus, when UAPI arrived, Kodi and IR remotes looked like this:
---------- -------------- --------------- | |--->---| Linux UAPI |-->---| Application | | | -------------- --------------- --->------| | IR remote | kernel | | | | | ------------ --------------- | |---->--| lirc |---->---| Kodi | | | ------------ --------------- ----------
As the UAPI matured, LIRC adopted the ability to use both pathways - UAPI and LIRC, allowing for:
---------- -------------- --------------- | |--->---| Linux UAPI |-->---| Application | | | -------------- --------------- --->------| | | IR remote | kernel | v | | | | | ------------ --------------- | |---->--| lirc |---->---| Kodi | | | ------------ --------------- ----------
However, Kodi (to this day) still relies on the to-the-right-of-the-kernel aspects of LIRC. This is why LIRC setup can be so confusing.
lircd
.If setting LIRC up with Linux, one needs to focus on using one path from the kernal to LIRC (via UAPI, or via LIRC's kernel device driver). Modern Linux kernels should focus on using the UAPI sequence. As Kodi continues to evolve, using the UAPI layer directly allows it to take advantage of non-IR-remote input controls, say an eyeball tracker, or voice controller.
This page assumes the UAPI -> LIRC -> Kodi route. If the older (and should be discontinued approach) is used, it is called out. |
How LIRC works with Kodi
To help understand how Kodi interacts with LIRC, consider the following scenario:
- You push a button on your remote (LIRC config file
lircd.conf
), That button is seen by the Kodi translator (Kodi LIRC mapping fileLircmap.xml
), Kodi starts the requested command (Kodi remote control mapping fileremote.xml
).
Let's trace it:
- You press: KEY_GO is the actual button name on the remote in lircd.conf
- LIRC "sees" the remote code, which is translated by the Lircmap.xml in Kodi's LIRC mapping file:
- And maps: KEY_GO
- Into the Kodi remote control command of: <play>
- Finally, Kodi using the remote.xml file:
- Takes the <play>
- and executes the internal Play command inside of Kodi.
Whatever value is there is the REAL name of our button on the remote as defined in lircd.conf. Remember, we can map any button to any function. The actual name of the button could be STOP if we wanted to (kinda dumb but it could be) The REAL button name on the remote is NOT required to have anything to logically do with the name of the command you want to perform
Just to illustrate we called it the KEY_GO button
So to sum it up
- Kodi sent a command (Remember we are going in reverse) called Play
- That Play command is tied to the Lircmap.xml <play></play>
- That Lircmap.xml <play></play> is tied to the real button on the remote that is called KEY_GO in lircd.conf
remote.xml:
<keymap> <global> <remote> <play>Play</play> </remote> </global> </keymap>
Lircmap.xml:
<lircmap> <remote device="My-Remote-Name"> <play>KEY_GO</play> </remote> </lircmap>
Stale LIRCD conf file
lircd.conf:
begin remote name "My-Remote-Name" bits 5 flags RC6|CONST_LENGTH eps 30 aeps 100 header 2662 836 one 452 429 zero 452 429 pre_data_bits 32 pre_data 0x1BFF83DF gap 106001 toggle_bit_mask 0x8000 rc6_mask 0x100000000 begin codes KEY_GO 0x0F end codes end remote
Installation
Generally, lirc is installed as a dependency by any system that requires it when installing Kodi.
Re-installing LIRC
TODO - clarify new vs. old dependencies
If for whatever reason you have to install/reinstall lirc, note that the manual says systemctl should be configured to enable/start lircd.socket, and lircd.socket will start lircd.service itself. This is NOT the case if you're installing for Kodi: Kodi will open its own socket, so you should enable *only* lircd.service for it to function properly.
lircmap.xml
A custom Lircmap.xml - This file merely defines the translation, bridging a LIRC_button to a XBMC_button. The file is literally named Lircmap.xml and is stored in the userdata directory. Do not confuse the Lircmap.xml with Keyboard.xml.
LIRC_Button - what your lircd.conf calls the physical button on your remote control.
XBMC_button - an Kodi internal button title.
device name - is defined in your lircd.conf file in the "name" field.
This information can be had using the test application "irw" and then hitting some buttons.
File format
Lircmap.xml format is as follows:
<lircmap> <remote device="devicename"> <Kodi_button>LIRC_button</Kodi_button> ... </remote> </lircmap>
Device name
The device name is defined in your lircd.conf file in the "name" field. This information can be had using the test application "irw" and then hitting some buttons.
Kodi button names
There are two type of Kodi_buttons in Kodi.
- Predefined Buttons are labelled using their button title such as:
<left> <right> <title> <menu>
These buttons are predefined in keymap.xml and handle all functions needed for a working system. For a complete list of buttons see Keymap#Remotes.
- Customized buttons are for people who require more buttons than are defined by default. For example;
<obc1>BUTTON1</obc1> ... <obc254>BUTTON254</obc254>
Note : These obc buttons must be defined in keymap.xml under the <universalremote> heading
FYI : obc stands for original button code and is a legacy of the old xbox IR remote system
Testing Lirc Output
use the command 'irw' to test your LIRC configuration
xbmc@xbmclinux:~$ irw 0000000000040004 00 ARROW_UP Cyp_Se_WitheHome 0000000000040004 00 VOLUME_UP Cyp_Se_WitheHome 0000000000040004 00 NUMPAD_6 Cyp_Se_WitheHome 0000000000040004 00 INFO Cyp_Se_WitheHome
In this example Cyp_Se_WitheHome is the device name ARROW_UP, VOLUME_UP, NUMPAD_6, INFO are button names
If you wish to redefine the button names it can be done in /etc/lircd.conf