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Special Forums News, Links, Events and Announcements Software Releases - RSS News libv4l 0.5.2 (Default branch)
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Old 10-23-2008
libv4l 0.5.2 (Default branch)
libv4l is a collection of libraries that adds a thin abstraction layer on top of video4linux2 (V4L2) devices. The purpose of this layer is to make it easy for application writers to support a wide variety of devices without having to write separate code for different devices in the same class. It consists of 3 different libraries. libv4lconvert offers functions to convert from any (known) pixel format to V4l2_PIX_FMT_BGR24 or V4l2_PIX_FMT_YUV420. libv4l1 offers the (deprecated) v4l1 API on top of v4l2 devices, independent of the drivers for those devices supporting v4l1 compatibility (which many v4l2 drivers do not). libv4l2 offers the v4l2 API on top of v4l2 devices, while adding for the application transparent libv4lconvert conversion where necessary. License: GNU Lesser General Public License (LGPL) Changes:
A workaround was introduced for some drivers' (notably pwc's) inconsistency in V4L's s_fmt() versus try_fmt() return values. Other minor improvements were made. Image

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LEARN ABOUT OPENSOLARIS

hal

hal(5)							Standards, Environments, and Macros						    hal(5)

NAME

       hal - overview of hardware abstraction layer

DESCRIPTION

       The  Hardware  Abstraction  Layer  (HAL)  provides a view of the various hardware attached to a system. This view is updated dynamically as
       hardware configuration changes by means of hotplug or other mechanisms. HAL represents a piece of hardware as a	device	object.  A  device
       object  is  identified  by  a  unique identifer and carries a set of key/value pairs, referred to as device properties. Some properties are
       derived from the actual hardware, some are merged from device information files (.fdi files), and some are related  to  the  actual  device
       configuration.

       HAL  provides  an  easy-to-use  API through D-Bus. D-Bus is an IPC framework that, among other features, provides a system-wide message-bus
       that allows applications to talk to one another. Specifically, D-Bus provides asynchronous notification such  that  HAL	can  notify  other
       peers on the message-bus when devices are added and removed, as well as when properties on a device are changing.

       In  the	Solaris  operating  system,  HAL is supported by a daemon, hald(1M), and a set of utilities that enable the adding and removing of
       devices and the modification of their properties.

SEE ALSO

       hald(1M), fdi(4)

       See the HAL pages, including the HAL specification, under http://freedesktop.org.

SunOS 5.11							    11 Sep 2006 							    hal(5)