ZoneMinder::Control::Dahua - Perl module for Dahua cameras

NAME SYNOPSIS DESCRIPTION COPYRIGHT AND LICENSE Private Methods _sendAbsolutePositionCommand( $arg1, $arg2, $arg3, $arg4 ) Public Methods Notes: new open close printMsg moveCon<direction> focusCon<range> moveRel<direction> focusRel<range> irisRel<Large/Small> moveStop presetHome reset reboot

NAME

ZoneMinder::Control::Dahua − Perl module for Dahua cameras

SYNOPSIS

use ZoneMinder::Control::Dahua; place this in /usr/share/perl5/ZoneMinder/Control

DESCRIPTION

This module is an implementation of the Dahua IP camera HTTP control API.

This library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110−1301 USA.

Private Methods

Methods intended for use internally but documented here for future developers.

_sendAbsolutePositionCommand( $arg1, $arg2, $arg3, $arg4 )

Where:
$arg1 = Horizontal angle 0Â° to 360Â°
$arg2 = Vertical angle 0Â° to −90Â°
$arg3 = Zoom multiplier
$arg4 = Speed 1 to 8
This is an private method used to send an absolute position command to the
camera.

Public Methods

Methods made available to control.pl via ZoneMinder::Control

Notes:

Which methods are invoked depends on which types of movement are selected in
the camera control type. For example: if the 'Can Move Continuous' option is
checked, then methods including 'Con' in their names are invoked. Likewise if
the 'Can Move Relative" option is checked, then methods including 'Rel' in
their names are invoked.
At present, these types of movement are prioritized and exclusive. This applies
to all types of movement, not just PTZ, but focus, iris, etc. as well. The options
are tested in the following order:
1. Continuous
2. Relative
3. Absolute
These types are exclusive meaning that the first one that matches is the one
ZoneMinder will use to control with. It would be nice to allow the user to
select the type used given that some cameras support all three types of
movement.

new

This method instantiates a new control object based upon this control module
and sets the 'id' attribute to the value passed in.

open

This method opens an HTTP connection to the camera. It handles authentication,
etc. Upon success it sets the 'state' attribute to 'open.'

close

This method effectively closes the HTTP connection to the camera. It sets the
'state' attribute to 'close.'

printMsg

This method appears to be used for debugging.

moveCon<direction>

This set of methods invoke continuous movement in the direction indicated by
the <direction> portion of their name. They accept no arguments and move the
camera at a speed of 1 for 0ms. The speed index of 1 is the lowest of the
accepted range of 1−8.
NOTE:
This is not true continuous movmement as currently implemented.

focusCon<range>

This set of methods invoke continuous focus in the range direction indicated
by the <range> portion of their name. They accept no arguments.
NOTE:
This is not true continuous movmement as currently implemented.

moveRel<direction>

This set of methods invoke relatvie movement in the direction indicated by
the <direction> portion of their name. They accept no arguments and move the
camera at a speed of 4 for 500ms. The speed index of 4 is half−way between
the accepted range of 1−8.

focusRel<range>

This set of methods invoke realtive focus in the range direction indicated by
the <range> portion of their name. They accept no arguments.
NOTE:
This only just does work. The Dahua API specifies "multiples" as the input.
We pass in a 1 for that as it does not seem to matter what number (0−8) is
provided, the camera focus behaves the same.

irisRel<Large/Small>

This set of methods invoke realtive iris size in the direction indicated by
the <Large/Small> portion of their name. They accept no arguments.
NOTE:
This only just does work. The Dahua API specifies "multiples" as the input.
We pass in a 1 for that as it does not seem to matter what number (0−8) is
provided, the camera iris behaves the same.

moveStop

This method attempts to stop the camera. The problem is that if continuous
motion is occurring in multiple directions, this will only stop the motion
in the 'Up' direction. Dahua does not support an "all−stop" command.

presetHome

This method "homes" the camera to a preset position. It accepts no arguments.
When either continuous or relative movement is enabled, pressing the center
button on the movement controls invokes this method.
NOTE:
The Dahua protocol does not appear to support a preset Home feature. We could
allow the user to assign a preset slot as the "home" slot. Dahua does appear
to support naming presets which may lend itself to this sort of thing. At
this point, we'll just send the camera back to center and zoom wide. (0Â°,0Â°,0)

reset

This method will reset the PTZ controls to their "default." It is not clear
what that is.

reboot

This method performs a reboot of the camera. This will take the camera offline
for the time it takes to reboot.

Updated 2024-01-29 - jenkler.se | uex.se