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CEC-FOLLOWER(1)			 User Commands		       CEC-FOLLOWER(1)

NAME
       cec-follower - An application to	emulate	CEC followers

SYNOPSIS
       cec-follower [-h] [-d _dev_] [other options]

DESCRIPTION
       The  cec-follower  tool	is used	to emulate CEC followers. Based	on the
       configured logical address(es) of the CEC device	it  will  emulate  the
       CEC behavior accordingly.

       Configuring the CEC device is done using	cec-ctl. Certain CEC function-
       alities are only	emulated if the	corresponding Device Features flag  is
       set (these are set when configuring with	cec-ctl). These	are:

	   - Audio Return Channel (RX and TX)
	   - Audio Rate	Control
	   - Deck Control
	   - Record TV screen

       cec-follower  is	 basically a message loop, waiting for messages	to ar-
       rive and	taking the appropriate action for each message (incoming  mes-
       sages can be shown with the --show-msgs option).	The follower maintains
       an internal state with appropriate parameters such as  volume,  current
       active  source,	power state and	so on (state changes can be shown with
       the --show-state	option).

       It also aims to be a reference implementation on	how a follower	should
       behave.

       cec-follower  will  keep	track of incoming messages and look for	viola-
       tions of	the CEC	specification with regards to timings. For example, it
       will  warn  if it receives the same message again within	200ms after it
       replied <Feature	Abort> ["Unrecognized Opcode"] to that message,	and it
       will check that press and hold behavior is done properly.

       cec-follower  will  periodically	 send out polling messages to discover
       when a remote device is removed or a new	one has	appeared. When	a  de-
       vice  is	 removed,  the	recorded information about it is cleared. Each
       logical address is polled about	once  every  15	 seconds.  In  between
       polls,  removing	 a remote device or replacing it with a	new one	is not
       detected.

       When running compliance tests with cec-compliance, cec-follower	should
       be  run	on  the	 same  device to act on	incoming messages that are not
       replies to messages sent	by the compliance tool.	Before	each  test-run
       cec-follower  should  be	 restarted if it is running, to	initialize the
       emulated	device with a clean and	known initial state.

OPTIONS
       -d, --device _dev_
	      Use device <dev> as the CEC device. If <dev> is a	 number,  then
	      /dev/cec<dev> is used.

       -D, --driver _drv_
	      Use  a cec device	that has driver	name _drv_, as returned	by the
	      CEC_ADAP_G_CAPS ioctl.  This option can be combined with	-a  to
	      uniquely identify	a CEC device without having to rely on the de-
	      vice node	number.

       -a, --adapter _adap-name_
	      Use a cec	device that has	adapter	name _adap-name_, as  returned
	      by  the CEC_ADAP_G_CAPS ioctl.  This option can be combined with
	      -D to uniquely identify a	CEC device without having to  rely  on
	      the device node number.

       -v, --verbose
	      Turn on verbose reporting.

       -w, --wall-clock
	      Show  timestamps	as wall-clock time. This also turns on verbose
	      reporting.

       -T, --trace
	      Trace all	called ioctls. Useful for debugging.

       -h, --help
	      Prints the help message.

       -n, --no-warnings
	      Turn off warning messages.

       -m, --show-msgs
	      Show received messages.

       -s, --show-state
	      Show state changes from the emulated device.

EXIT STATUS
       On success, it returns 0. Otherwise, it will return the error code.

BUGS
       This manual page	is a work in progress.

       Bug reports or questions	about this  utility  should  be	 sent  to  the
       linux-media@vger.kernel.org mailinglist.

SEE ALSO
       cec-compliance(1), cec-ctl(1)

v4l-utils 1.18.0		  August 2016		       CEC-FOLLOWER(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | BUGS | SEE ALSO

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