Altera Video and Image Processing Suite - Manual (Page 275)

Class Description
class c_av_st_video_file_io
Parameterized class.
Extends c_av_video_item. Comprises of width, height, and
interlaced bits (the fields found in an Avalon-ST video control
packet). It also contains data types and methods that control the
addition of garbage beats that are used by other classes. The class
provides methods to get and set the individual fields.
class c_av_st_user_packet This parameterized class is defined in a separate file (av_st_video_
file_io_class.sv) because some test environments do not use video
data from a file, using constrained random data generated by the
other classes instead.
This class provides the following methods:
• to read and write video files (in .raw format)
• to send or receive videos and control packet objects to or from
the mailbox.
Variables that govern the file I/O details include the ability to
artificially lengthen and shorten video packets and to introduce
garbage beats into control packets by various get and set method
calls.
Typical usage of the file I/O class is to construct two objects—a
reader and a writer, call the open file methods for both, call the
read_file
method for the reader, and repeatedly call the
wait_
for_and_write_video_packet_to_file
method in the writer.
The parameters for this class are BITS_PER_CHANNEL and
CHANNELS_PER_PIXEL.
Running the Tests
This example system is available in the Quartus II install directory.
• For example video files test:
$(QUARTUS_ROOTDIR)/../ip/altera/vip/verification/example_video_files
• For constrained random test:
$(QUARTUS_ROOTDIR)/../ip/altera/vip/verification/
example_constrained_random
Note: The actual commands used in this section are for a Linux example. However, the same flow applies
for Windows users.
1. Automatically generate the tb.v netlist from the Qsys system integration tool in the Quartus II
software.
UG-VIPSUITE
2015.05.04
Running the Tests A-7
Avalon-ST Video Verification IP Suite Altera Corporation
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