Altera Video and Image Processing Suite - Manual (Page 272)

Table A-1: Class Description
The table describes each of the classes in the av_st_video_classes package.
Note: The classes listed do not contain information about the physical transport mechanism and the Avalon-ST
Video protocol. To foster advanced verification techniques, Altera uses a high-level abstract view.
Class Description
class c_av_st_video_item The most fundamental of all the classes.
Represents any item that is sent over the Avalon-ST bus and
contains a
packet_type
field.
You can set the field to
video_packet
,
control_packet
, or
user_
packet
types. These three packet types are represented by classes
which extend this base class.
Structuring the classes in this way allows you to define the
mailboxes and queues of c_av_st_video_item. Then, you can send
any type of packet in the order that they appear on the bus.
class c_pixel
Fundamental and parameterized class.
Comprises of an array of channels that contains pixel data. For
example, a pixel from an RGB24 video system comprises an array
of three channels (8 bits per channel).
A pixel for a YcbCr system comprises two channels. An individual
channel either represents a luminance or chroma-type component
of video data, one RGB component, or one alpha component. The
class provides “getters”, “setters”, and “copy” methods.
The parameters for this class are BITS_PER_CHANNEL and
CHANNELS_PER_PIXEL.
class c_av_st_video_data Parameterized class.
Contains a queue of pixel elements. This class library is used by
other classes to represent fields of video and line (or smaller) units
of video. It extends c_av_video_item. The class provides methods
to push and pop pixels on and off the queue.
The parameters for this class are BITS_PER_CHANNEL and
CHANNELS_PER_PIXEL.
A-4 Avalon-ST Video Class Library
UG-VIPSUITE
2015.05.04
Altera Corporation Avalon-ST Video Verification IP Suite
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