Altera Video and Image Processing Suite User Manual
Page 293
Method Call
Description
task read_video_packet();
The main file reading method call. Binary data
is read from the file and packed into pixel
objects according to the settings of
ycbr_
pixel_order
and endianism. Pixel objects are
packed into a video data object, with some
pixels optionally added or discarded if late/
early EOP is being applied. When one
complete field of video has been read (as
determined by the height and width controls),
the
video_data
object is put in the mailbox.
task wait_for_and_write_video_packet_to_file()
;
When called, this method waits for an object
to be put in the mailbox (usually from a sink
BFM). When a control or a user packet object
arrives, this call is reported and ignored. When
a video packet arrives, the video data is written
to the open file in little endianism format.
Table A-9: Members of c_av_st_video_file_io Class
Member
Description
local int video_packets_handled = 0;
video_packets_handled
is added whenever a
packet is read or written to or from the file.
local int control_packets_handled = 0;
control_packets_handled
is added
whenever a control packet is put in the object’s
mailbox.
local int user_packets_handled = 0;
user_packets_handled
is added whenever a
user packet is put in the object's mailbox.
local reg[15:0] image_height;
—
local reg[15:0] image_width;
—
local reg[3:0] image_interlaced;
—
string image_fourcc;
—
local string object_name = "file_io";
—
local string filename;
—
local string spc_filename;
—
local int fourcc_channels_per_pixel;
Set when the associate
.spc
file is read.
local int fourcc_bits_per_channel;
Set when the associate
.spc
file is read.
local int fourcc_pixels_per_word;
Set when the associate
.spc
file is read.
local int fourcc_channel_lsb;
Set when the associate
.spc
file is read.
int early_eop_probability = 20;
—
UG-VIPSUITE
2015.05.04
c_av_st_video_file_io
A-25
Avalon-ST Video Verification IP Suite
Altera Corporation