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VMC-7440_v8_0_6_Quick Start_V1_0_0.doc
7. PARAMETERS CONFIGURATION
7.1. Introduction to VMC-7440 SDK
The VMC-7440 SDK uses the Vitec framework named Livewire which provides a set of ready
to use software modules (also named Livewire components). Each Livewire component has
been developed to perform a specific task of the product.
For instance, the “Video Encoder” component is responsible of the video encoding process
whereas the “Storage” component writes data on hard disk.
All the different features such as MPEG encoding, live video preview, grab of still image or
OSD control are structured into different branches such as “Capture” for the MPEG recording,
“Preview” for the live video, “Grab” for capturing still image in bmp format or “OSD” for the
OSD control. Therefore, a branch is a chain of components link together in order to perform a
complex feature.
The different modes of the product (for instance changing the MPEG standard of the encoded
file) are structured into assemblies which is a group of branches.
Application controls the different features through start, pause, resume or stop commands
send to branches. This principle allows an independent control of the different features.
Each Livewire component can be configured through their own parameters. All parameters of
a component are stored into a parameters section visible through the Livewire settings page
under the parameter name. A segment gathers component parameters’ values in order to
keep current values.
7.2. XML configuration file
XML files are configuration files used by each application developed with the VMC-7440 SDK.
It describes available components, branches, segments and it also stores parameters within
presets.
XML file can be adapted to a specific application. Sample application written in C++ is
designed to work with the reference xml file (VMC-7440 reference.xml) delivered in this
package. After initialization, XML content is interpreted and loaded into application memory
and parameters can be modified by final user through the LiveWire Setting pages.
7.3. Assembly selection
An assembly is a set of components instantiated together for a specific usage. It is organized
into branches allowing independent control of several features such as Video Encoding, Video
Preview or Still Image grabbing by starting or stopping them individually.
Following branches are available for each assembly of VMC-7440 reference.xml :
“Capture” branch controlling MPEG encoding.
“Grab” branch controlling still image grabbing.
“Preview” branch controlling Video Preview.
“OSD” branch controlling OSD feature.
Six different assemblies are available in the “VMC-7440 reference.xml”:
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