2.4 Transition from Data Centric to Device Centric
The overall design of the API can now be described as device centric, rather than data centric.
The concepts of Production Nodes, Production Graphs, Generators, Capabilities, and other such
data centric concepts, have been eliminated in favor of a much simpler model that provides
simple and direct access to the underlying devices and the data they produce. The functionality
provided by OpenNI 2 is generally the same as that provided by OpenNI 1.5.2, but the
complicated metaphors for accessing that functionality are gone.
2.5 Easier to Learn and Understand
It is expected that the new API will be much easier for programmers to learn and begin using.
OpenNI 1.5.2 had nearly one hundred classes, as well as over one hundred supporting data
structures and enumerations. In OpenNI 2, this number has been reduced to roughly a dozen,
with another dozen or so supporting data types. The core functionality of the API can be
understood by learning about just four central classes:
openni::OpenNI
openni::Device
openni::VideoStream
openni::VideoFrameRef
Unfortunately, this redesign has required us to break backward compatibility with OpenNI 1.5.2.
The decision to do this was not made lightly; however, it was deemed necessary in order to
achieve the design goals of the new API.
2.6 Event Driven Depth Access
In OpenNI 1.5 and before, depth was accessed by placing a loop around a blocking function that
provided new frames as they arrive. Until a new frame arrived the thread would be blocked.
OpenNI 2 still has this functionality, but it also provides callback functions for event driven
depth reading. These callback functions are invoked on sensors becoming available (further
sensors can be connected to the host system while OpenNI is running), and on depth becoming
available.
3 Summary of New Classes
openni::OpenNI Provides the entry point and overall context for the library,
and provides access to devices, and to events related to
devices entering and leaving the system.Replaces:
OpenNI 1.5 Context class
openni::Device Provides the connection to a device, for configuring it and
obtaining video streams (implemented as VideoStream
objects).A Device represents either:ޠphysical hardware
devicethat is producing actual streams of data- or ޠ-file
devicethat contains a recording taken from a physical
device.For each device there is one stream each for color,
IR, and depth.Replaces: OpenNI 1.5 Device class, the
Depth, IR, and Image Generator classes, an all production
nodes
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