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uvcdynctrl - Manage dynamic controls in uvcvideo
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================================================
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For an introduction to dynamic controls you should first read the dynctrl.txt
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that comes with the Linux UVC driver. You can find it here:
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http://svn.berlios.de/svnroot/repos/linux-uvc/linux-uvc/trunk/
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The combination of uvcdynctrl and libwebcam allows to manage these dynamic
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controls from user space. While libwebcam contains the actual implementation,
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uvcdynctrl presents a command line interface to do so.
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Currently only the UVCIOC_CTRL_ADD and UVCIOC_CTRL_MAP ioctls are supported.
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Support for the remaining functions is planned. The documentation is not really
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complete at this time. In particular, the XML format that is used to describe
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dynamic controls is undocumented except for a sample file and an XML schema.
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This will be fixed very soon.
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uvcdynctrl is designed to eventually work together with udev, so that control
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mappings are automatically added whenever a UVC device is plugged and a
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matching dynamic controls configuration file is available.
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Apart from the dynamic controls feature uvcdynctrl also provides a few handy
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functions that illustrate the power of libwebcam. Check out the built-in
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command line help for details.
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The uvcdynctrl package contains udev support, i.e. a udev rule file and a
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helper script that calls uvcdynctrl to import the appropriate XML file when
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a camera is connected.
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If you run "make install" as root, the following udev-related files will be
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/etc/udev/rules.d/80-uvcdynctrl.rules (rule for V4L devices)
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/lib/udev/uvcdynctrl (helper script to launch uvcdynctrl)
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/etc/udev/data/046d/logitech.xml (dynamic control configuration for Logitech
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These paths are hardcoded in uvcdynctrl/CMakeLists.txt and have only been
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tested on Ubuntu with udev versions >= 141. If your distribution uses different
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paths, you need to make changes to that file before running the installation.
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If you're using an older version of udev you may want to try the udev scripts
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of an older version which is tagged as "0.1.3-pre" and can be found here:
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http://svn.quickcamteam.net/svn/qct/webcam-tools/tags/0.1.3-pre/
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Please send us feedback (preferrably through the QuickCam Team forum, see the
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main README file for the link) about the udev functionality, especially on
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If you want to debug the uvcdynctrl udev script, you can find some basic debug
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output in /var/log/uvcdynctrl-udev.log.
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0.3 (under development):
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- Reorganized the directory layout and build system.
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- Exit with a non-zero code if errors occur while getting or setting controls.
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- Improved udev support (udev >= 141 is required now).
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- Experimental support for udev (support script and rules).
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- Added a new option -f or --formats to list a device's frame format list
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(pixel formats, frame sizes, and frame intervals).
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- Make use of the improved error message reporting in libwebcam.
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- Added support for displaying processing statistics in verbose mode.
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- Support for the new informational messages (dynctrl).
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- Added a hint to the quick help on how to set negative control values.
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- Fix: Import (-i) no longer needs a valid device to be specified (or the
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default video0 to be present).
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Building, questions, and feedback
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---------------------------------
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Please see the README file in the top level directory for building
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instructions and how to contact the developers.
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Copyright (c) 2006-2010 Logitech.
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uvcdynctrl is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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uvcdynctrl is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with uvcdynctrl. If not, see <http://www.gnu.org/licenses/>.
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uvcdynctrl/README
